The Effects of Speed with Dynamic Stretching on Musculotendinous Stiffness
Naoto Kyotani, Kensuke Oba, Tomoya Ishida, Yuta Koshino, Miho Komatsuzaki, Minori Tanaka, Satoshi Kasahara, Harukazu Tohyama, Mina Samukawa
Applied Sciences, 2026年03月
研究論文（学術雑誌）

Bounce-Based Aerobic Exercise Improves Postpartum Mood: A Large-Scale Pre–Post Study
Shizuka Torashima, Sonoko Fujibayashi, Naoko Kishimoto, Mina Samukawa
Brain Sciences, 2026年01月
研究論文（学術雑誌）

Contextual interference enhances vertical transfer of fine motor skill from upper to lower limbs.
Satoshi Kasahara, Hiroshi Saito, Linjing Jiang, Kazumasa Yoshimi, Shikino Abe, Tomoya Ishida, Yuta Koshino, Mina Samukawa, Harukazu Tohyama
Human movement science, 105, 103428, 103428, 2025年12月18日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: While contextual interference (CI) is known to facilitate motor learning, its role in promoting interlimb transfer-particularly from the upper to the lower limb-remains underexplored. OBJECTIVE: This study examined how different practice schedules (random vs. serial) influence the transfer of fine force control both horizontally (to the contralateral hand) and vertically (to the contralateral ankle). METHODS: Thirty healthy young adults (N = 30; Male = 21, Female = 9; Mean age: 21.9 ± 1.6 years) were divided equally into a random (RTG: N = 15) or serial (STG: N = 15) schedule group. Most participants were right-handed, with three left-handed individuals included across the two groups. Participants practiced a force-matching task with their non-dominant hand using either a random or serial schedule. Transfer effects were assessed in the contralateral hand and ankle at four target force levels (20-80 % of maximal voluntary contraction, MVC). RESULTS: Both practice conditions improved force control in the contralateral hand (p < .05), indicating horizontal transfer. However, vertical transfer to the foot emerged only after random practice (p < .05) and was limited to moderate and high force levels. These findings suggest that the interaction between task difficulty and practice variability critically influences the extent and direction of interlimb transfer. CONCLUSION: High CI practice promotes vertical transfer of motor skill when task demands are sufficiently challenging. These results highlight the importance of training structure in facilitating the generalization of motor control across limbs, offering practical implications for skill acquisition in both athletic and rehabilitation settings.

Acute effects of dynamic stretching on the mechanical properties of the triceps surae muscles assessed using shear wave ultrasound elastography.
Kensuke Oba, Michito Murayama, Sanae Kaga, Mina Samukawa
Journal of medical ultrasonics (2001), 2025年10月09日, ［国内誌］
英語, 研究論文（学術雑誌）, PURPOSE: Dynamic stretching (DS), characterized by repeated movements through the joint range of motion via antagonist muscle contraction, is thought to reduce muscle stiffness through mechanisms such as reciprocal inhibition. However, whether DS effectively decreases muscle stiffness remains unclear. This study aimed to investigate the acute effects of DS on triceps surae muscle stiffness using shear wave elastography. METHODS: Sixteen healthy young adults performed both 120-s DS and control (no stretching) tasks. Shear wave velocities of the medial gastrocnemius (MG), lateral gastrocnemius (LG), and soleus (SOL) muscles were measured as indicators of muscle stiffness before and after DS. RESULTS: Our findings indicated that DS significantly reduced the shear wave velocity in the MG. However, no significant changes were observed in the shear wave velocities of the LG and SOL. CONCLUSION: DS effectively decreased MG stiffness, with no observed effects in the LG or SOL. These findings highlight inter-muscular variability in response to DS and suggest that DS may be particularly beneficial for targeting stiffness in the MG of the triceps surae muscles.

Effects of landing instructions on Achilles tendon load: Emphasising hip flexion as the optimal strategy.
Yuta Koshino, Mina Samukawa, Tomoya Ishida, Harukazu Tohyama
Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2025年08月29日, ［国際誌］
英語, 研究論文（学術雑誌）, PURPOSE: Managing Achilles tendon (AT) load during dynamic activities is essential for preventing and rehabilitating Achilles tendinopathy. While various exercises have been studied, the impact of verbal instructions on landing mechanics remains unclear. This study aimed to identify instructional methods that effectively reduce AT load during drop vertical jumps (DVJs). METHODS: Twenty-three healthy participants performed DVJs under five instructional conditions: (1) natural: no instruction; (2) posterior-centre of pressure (COP): shifting the COP posteriorly; (3) hip-flexion: increasing hip flexion; (4) knee-flexion: increasing knee flexion; and (5) quiet-landing: minimising landing sound. A three-dimensional motion analysis system recorded peak AT force, loading rate, joint angles, ground reaction force (GRF) and COP position. Data were analysed using the Friedman test, the Wilcoxon signed-rank test with Holm's correction and effect size (ES). RESULTS: Peak AT force was significantly lower in hip-flexion and posterior-COP compared to natural (p < 0.001, ES = -0.87 and -0.82, respectively). Hip-flexion also showed lower AT force than the knee-flexion and quiet-landing (p < 0.01). Loading rates were lower in hip-flexion (ES = -0.73) and quiet-landing (ES = -0.64) than in natural (p < 0.01) but were higher in posterior-COP than hip-flexion (p = 0.042). Hip-flexion, knee-flexion and quiet-landing increased hip flexion (p < 0.001), while knee-flexion and quiet-landing increased knee flexion (p < 0.001) compared to natural. Posterior-COP resulted in decreased hip, knee and ankle flexion, increased vertical GRF and a more posterior COP position compared to the other conditions (p < 0.05). Vertical GRF was lower in hip-flexion, knee-flexion and quiet-landing than in natural (p < 0.005). CONCLUSIONS: Increasing hip flexion is the most effective strategy for reducing AT force during landing, and may aid in the prevention and rehabilitation of Achilles tendinopathy. Although a posterior COP shift lowers AT force, it increases AT loading rate and GRF, potentially elevating injury risk. LEVEL OF EVIDENCE: Level III.

Acute Effects of Static Stretching on Submaximal Force Control of the Ankle
Fuma Sentoku, Yuta Koshino, Masahiro Sato, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama, Mina Samukawa
Applied Sciences, 15, 1583, 2025年06月
研究論文（学術雑誌）

Integrating Motor Learning Principles into Muscle Force and Balance Control.
Yuting Wei, Satoshi Kasahara, Linjing Jiang, Ami Chiba, Tomoya Ishida, Yuta Koshino, Mina Samukawa, Hiroshi Saito, Harukazu Tohyama
Journal of motor behavior, 1, 9, 2025年05月20日, ［国際誌］
英語, 研究論文（学術雑誌）, The principles of specificity and similarity play a crucial role in supporting the transfer and retention of motor performance in general sports training. Nevertheless, the extent to which force control ability translates into dynamic performance remains unclear. We aimed to investigate the effect of force control training on the transfer and retention of balance control in 18 young individuals. The force control training utilized a visual-guided force tracking task with either a uniform or non-uniform sinusoidal wave in ankle plantar flexors (PF). Postural stability was assessed by measuring the center of pressure (COP) in a single-leg standing posture. Despite consistent repetitions, no significant differences in COP parameters were observed between the pre- and post-training assessments. However, significant differences were noted between the pre-training assessments and the post-training assessments conducted one week later, utilizing a randomized order. Shifting from a regimen of constant repetition to a randomized order has a positive impact on the transfer and retention of acquired motor skills. This approach, based on the motor learning theory, holds promise for enhancing the motor performance of athletes and patients undergoing rehabilitation.

The Effect of Real-Time Feedback Regarding the Center-of-Pressure Position on Patellofemoral Joint Loading During Double-leg Squatting
Tomoya Ishida, Ryo Ueno, Yu Kitamura, Yoshiki Yamakawa, Mina Samukawa, Harukazu Tohyama
Orthopaedic Journal of Sports Medicine, 13, 3, SAGE Publications, 2025年03月03日
研究論文（学術雑誌）, Background:

Exercise therapy is the cornerstone of patellofemoral (PF) pain management. However, whether squat exercises are therapeutic or detrimental depends on their technique and the resulting load on the PF joint.

Purpose/Hypothesis:

The purpose of this study was to investigate whether real-time feedback to position the center-of-pressure (COP) anteriorly could reduce the PF joint reaction force and stress during bodyweight double-leg squatting. It was hypothesized that an anterior COP position would decrease the PF joint reaction force and stress without changing the trunk flexion angle, whereas a posterior COP position would increase the PF joint reaction force and stress.

Study Design:

Controlled laboratory study.

Methods:

Sixteen men (age, 22.9 ± 1.5 years; height, 173.6 ± 5.2 cm; and body mass, 63 ± 6.8 kg) performed double-leg squatting under 4 conditions—natural, anterior, middle, and posterior COP. Kinematic and kinetic data were obtained via standard 3-dimensional motion analysis and force plate data. The PF joint reaction force and stress were calculated via a musculoskeletal modeling approach.

Results:

PF joint loading was significantly reduced in the anterior and middle COP conditions compared with the natural condition. At 90° of knee flexion, the PF joint reaction force decreased by 11% and 9% in the anterior and middle COP conditions, respectively, compared with that in the natural condition (anterior: P < .001, 95% CI −0.996 to −0.277 bodyweight; middle: P = .011, 95% CI −0.795 to −0.087 bodyweight). Moreover, the peak PF joint stress decreased by 9% and 7% in the anterior and middle COP conditions, respectively, compared with the natural condition (anterior: P = .001, 95% CI −0.659 to −0.146 MPa; middle: P = .023, 95% CI −0.600 to −0.036 MPa). Compared with those under the natural condition, the trunk forward inclination angles did not increase under anterior or middle COP conditions.

Conclusions:

Real-time feedback for anterior COP positioning is an effective strategy for reducing the PF joint reaction force and stress during double-leg squatting without increasing trunk forward lean.

Clinical Relevance:

The incorporation of real-time feedback regarding the anteroposterior COP position is useful for reducing PF joint loading during double-leg squatting, which may be helpful in the rehabilitation of PF pain patients. Instructions to position the COP anteriorly may also be useful in reducing PF joint loading during double-leg squatting.

Investigation of Varying Durations of Dynamic Stretches on Muscle Stiffness of the Ankle Plantar Flexors Using Shear Wave Ultrasound Elastography.
Kensuke Oba, Michito Murayama, Sanae Kaga, Mina Samukawa
Journal of musculoskeletal & neuronal interactions, 25, 1, 68, 73, 2025年03月01日, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVES: This study investigated the acute effects of dynamic stretch (DS) duration on the muscle stiffness of the ankle plantar flexor using shear wave ultrasound elastography. METHODS: Eighteen healthy young participants were enrolled in this study. DS with one set (DS1) or four sets (DS4) of 30 s each was performed randomly. Shear wave velocity in the medial gastrocnemius (MG) was measured before and after DS to assess muscle stiffness of the MG. RESULTS: Two-way repeated-measures analysis of variance (condition × time) showed a significant interaction with the shear wave velocity (p = 0.02). Shear wave velocity significantly decreased after the DS4 than before (before:3.09 ± 0.59 m/s; after: 2.86 ± 0.43 m/s). However, no significant differences were observed in shear wave velocity between before and after DS1 (before: 2.96 ± 0.56 m/s; after: 3.19 ± 0.56 m/s). There were no significant differences in shear wave velocity at baseline condition. After the intervention, significantly lower shear wave velocity was observed in DS4 than in DS1. CONCLUSIONS: The results of this study demonstrate that DS with four sets of 30 s effectively decreased the muscle stiffness of the MG.

Relationship Between Vertical Ground Reaction Force and Acceleration from Wearable Inertial Measurement Units During Single-Leg Drop Landing After Anterior Cruciate Ligament Reconstruction
Makoto Suzuki, Tomoya Ishida, Hisashi Matsumoto, Kenichiro Kondo, Shota Yamaguchi, Satoru Kaneko, Chiharu Inoue, Yoshimitsu Aoki, Harukazu Tohyama, Mina Samukawa
Applied Sciences, 2025年02月
研究論文（学術雑誌）

Association Between Maturity Status, Landing Force, and Jump Performance in Adolescent Male Soccer Players.
Takahiro Namiki, Mina Samukawa, Eri Takagi, Tomoya Ishida, Mario Bizzini, Naoto Kyotani, Miho Komatsuzaki, Ginji Nara, Yuta Koshino, Satoshi Kasahara, Harukazu Tohyama
International journal of sports physical therapy, 20, 8, 1131, 1141, 2025年, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Maturity status varies among adolescents of the same age, making age an unreliable indicator. Although maturity status affects movement patterns, differences in landing force and jump performance among maturity groups remain unclear. HYPOTHESIS/PURPOSE: This study compared landing force and jump performance during drop vertical jump in adolescent male soccer players based on classifications by maturity status and age. A hypothesis was formulated that landing force would be greater during the period of peak height velocity (PHV) and jump performance higher in the post-PHV group, showing clearer differences than age. STUDY DESIGN: Cross-sectional study. METHODS: Forty-five male soccer players (13.5 ± 0.9 years) were grouped by maturity status (pre-, circa-, and post-PHV), and by age. Landing forces (peak vertical ground reaction force [PVGRF], time to PVGRF, and loading rate) and jump performance (jump height, contact time, reactive strength index [RSI], PVGRF, and power) were measured using a force plate. A one-way analysis of variance was performed to detect group differences. RESULTS: Landing forces showed no significant differences among maturity groups (PVGRF: p = 0.190; time to PVGRF: p = 0.122; and loading rate: p = 0.255). Jump height was greater in post-PHV (32.87 ± 4.18 cm) than in pre-PHV (25.17 ± 4.85 cm, p = 0.001). RSI was higher in post- (1.33 ± 0.31 m/s) than in pre- (1.00 ± 0.29 m/s, p = 0.024) and circa-PHV groups (1.02 ± 0.23 m/s, p = 0.021). Power was greater in post- (40.40 ± 6.31 W/kg) than in pre- (33.15 ± 7.78 W/kg, p = 0.045) and circa-PHV groups (33.59 ± 5.50 W/kg, p = 0.037). Age-related differences were found only in jump height (p < 0.001). CONCLUSION: Maturity status classification detected significant group differences in jump height, RSI, and power, but age classification only detected a significant group difference in jump height. LEVEL OF EVIDENCE: 3.

The International Federation of Sports Physical Therapy at the World Physiotherapy Congress 2025: Shaping a Global Commitment to Sustainable Athlete Health.
Suzanne Gard, Eva Ursej, Derya Ozer Kaya, Florian Forelli, Mina Samukawa
International journal of sports physical therapy, 20, 9, 1432, 1435, 2025年, ［国際誌］
英語, 研究論文（学術雑誌）, UNLABELLED: Health and physical activity are important for sport injury prevention in athletes. A clinical seminar session at the World Physiotherapy Congress 2025 in Tokyo highlighted the need for sports physiotherapists to identify and address risk factors, design individualized prevention programs, and use their expertise when working with athletes. The purpose of this perspective article is to revisit the content of that seminar and encourage the employment of primary, secondary, and tertiary prevention strategies to positively affect athlete health and ensure sustainable performance among athletes. LEVEL OF EVIDENCE: 5.

Foot Flexibility and Alignment Are Weakly Correlated with Multisegment Foot Kinematics During the Landing Task.
Yuya Ezawa, Yuta Koshino, Masanori Yamanaka, Takumi Okunuki, Mina Samukawa, Takeo Maruyama, Harukazu Tohyama
Journal of the American Podiatric Medical Association, 115, 2, 2025年, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Flat feet show increased foot motion during dynamic tasks. Although the increased motion is one of the risk factors for sports-related injuries, few studies have investigated how foot flexibility affects foot kinematics during landing. This study aimed to investigate the relationship between foot alignment, foot flexibility, and multisegment foot kinematics during a double-leg landing task in healthy participants. METHODS: Thirty-eight healthy volunteers (50% female) participated in this study. Their mean ± SD age was 22.0 ± 1.3 years; height, 166.1 ± 8.9 cm; and mass, 57.5 ± 8.8 kg. Foot alignment and flexibility were assessed using normalized navicular height truncated (NNHt) and the navicular drop (ND) test, respectively. A multisegment foot model was used to record shank, rearfoot, midfoot, and forefoot motion during drop landing from a height of 30 cm. Peak angle and range of motion were measured for each segment from the initial contact to 200 msec after landing. The relationships between NNHt, ND, and foot kinematics were explored. RESULTS: The NNHt was significantly correlated with peak rearfoot eversion angle (r = -0.353). The ND test values were significantly correlated with midfoot dorsiflexion and forefoot inversion excursion (r = 0.364 and 0.356, respectively). No significant correlation was found for the other kinematic outcomes. CONCLUSIONS: Foot alignment and flexibility should be evaluated separately because these foot measurements were correlated with different foot motions. However, it may be difficult to predict foot motion during the landing task by evaluating foot alignment and flexibility.

Relationship Between Quadriceps Strength at 6 Months Postoperatively and Improvement in Patient-Reported Knee Function After Anterior Cruciate Ligament Reconstruction.
Tomoya Ishida, Makoto Suzuki, Hisashi Matsumoto, Mina Samukawa, Satoru Kaneko, Chiharu Inoue, Yoshimitsu Aoki, Harukazu Tohyama
Orthopaedic journal of sports medicine, 13, 1, 23259671241305623, 23259671241305623, 2025年01月, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Understanding the factors associated with poor recovery over time after anterior cruciate ligament reconstruction (ACLR) helps clinicians identify patients who are at risk and targets for an intervention. PURPOSE: To determine the factors associated with improvement in subjective knee function from 6 to 12 months after ACLR. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: A total of 91 patients undergoing primary unilateral ACLR were included. Subjective knee function was assessed using the International Knee Documentation Committee Subjective Knee Form (IKDC-SKF) at 6 and 12 months postoperatively. Isokinetic knee strength (quadriceps and hamstring) and Anterior Cruciate Ligament-Return to Sport After Injury (ACL-RSI) scale scores were also assessed. Patients were included in the poor recovery group if their improvement in the IKDC-SKF score from 6 to 12 months was <15.5 points (minimal detectable change) and their IKDC-SKF score at 12 months was <90 points (maximum, 100 points). The IKDC-SKF score, knee strength, and the ACL-RSI score were compared between the poor recovery and good recovery groups with and without propensity score matching. Matched variables included age, sex, and IKDC-SKF score at 6 months after ACLR. In addition, logistic regression analysis was performed to identify factors that discriminated between the poor recovery and good recovery groups. RESULTS: There were 32 participants (35%) allocated to the poor recovery group. Before propensity score matching, the poor recovery group had a significantly older age, lower IKDC-SKF scores at 6 and 12 months, and a lower limb symmetry index (LSI) for quadriceps strength at 6 months. After propensity score matching, the LSI for quadriceps strength at 6 months was significantly different between the poor recovery and good recovery groups (73.0 ± 17.4 vs 83.3 ± 18.2, respectively; P = .039). Logistic regression analysis showed that a lower LSI for quadriceps strength at 6 months was significantly associated with poor recovery of the IKDC-SKF score (odds ratio, 0.96 [95% CI, 0.93-0.98]), and receiver operating characteristic curve analysis identified 80.9% as a cutoff value of the LSI for quadriceps strength with 75.0% sensitivity and 61.0% specificity. CONCLUSION: A lower LSI for quadriceps strength at 6 months postoperatively was associated with poor recovery of the IKDC-SKF score from 6 to 12 months after ACLR, even after adjusting for confounders.

Acute effects of static stretching on postural control during a maximum forward-leaning task in young and older adults
Kensuke Oba, Mina Samukawa, Moeka Ohta, Izumi Oka, Satoshi Kasahara, Teppei Suzuki, Katsuhiko Ogasawara
Isokinetics and Exercise Science, SAGE Publications, 2024年12月17日
研究論文（学術雑誌）, Background

Static stretching (SS) is effective in increasing flexibility and neuromuscular function, leading to changes in postural control.

Objective

This study aimed to examine the acute effects of SS on ankle plantar flexors and dynamic postural control during a maximum forward-leaning task in young and older adults.

Methods

Twenty-eight university students and 22 community-dwelling older adults were included in this study. The participants performed 5 sets of 1-min SS for the ankle plantar flexors of both legs with standing on a stretching board. Ankle dorsiflexion range of motion (ROM) and center of pressure (COP) during the maximum forward-leaning task, the COP area, and the anterior limit of stability were assessed before and after SS.

Results

SS increased ankle dorsiflexion ROM, COP velocity, and anterior limit of stability, whereas changes in the COP area were not significant after SS. Furthermore, there were no differences in the changes in postural control between young and older adults, whereas ROM increase was greater in older adults than in young adults.

Conclusions

These findings suggest that SS can improve postural control and can serve as a simple, low-risk intervention to reduce the risk of falls in older, at-risk adult populations.

The effects of intermittent and continuous dynamic stretching with a duration-matched protocol on range of motion and single-leg jump performance
Kensuke Tsutsumi, Mina Samukawa, Kensuke Oba, Miho Komatsuzaki, Yuna Kamewari, Fuma Sentoku, Yuta Koshino, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama
Sport Sciences for Health, Springer Science and Business Media LLC, 2024年11月08日
研究論文（学術雑誌）

Association Between Physical Activity and Performance in Skill Learning Among Older Adults Based on Cognitive Function.
Satoshi Kasahara, Ami Chiba, Linjing Jiang, Tomoya Ishida, Yuta Koshino, Mina Samukawa, Hiroshi Saito, Harukazu Tohyama
Journal of aging and physical activity, 1, 12, 2024年10月28日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND/OBJECTIVES: Most older adults experience cognitive and physical functioning problems; however, they require the ability to learn skills in response to age-related or social environmental changes for independent living. This study aimed to clarify the associations between age-related physical activity and performance in skill learning tasks based on cognitive function. METHODS: Fifty-eight adults participated in this study and were divided into two groups: the control group (aged under 65 years) and older adult group (aged over 65). All the participants performed two-skill learning exercises based on cognitive function. Habitual exercise was measured using an accelerometer and a self-reported questionnaire. RESULTS: At baseline, the scores on skill tasks were lower in the older adult group than in the control group and were associated with habitual exercise and motor performance. Skill acquisition, observed in both groups, was associated with age and self-reported physical activity. Retention of the acquired skill was not associated with habitual exercise, and it declined significantly in the older group. CONCLUSIONS: Skill acquisition was maintained regardless of age; however, the ability to retain the acquired skills decreased among the older adults. Habitual physical activity was associated with skill acquisition but not the retention of the acquired skill. Significance/Implications: The study findings highlight the association between habitual exercise and motor skill learning in older adults, providing insight for practitioners in the rehabilitation and health care fields.

Effects of short-duration constant torque and constant angle stretching on the musculotendinous stiffness of ankle plantar flexors
Kensuke Oba, Mina Samukawa, Satoshi Kasahara, Tomoya Ishida, Harukazu Tohyama
Sport Sciences for Health, 2024年09月21日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Validity and Reliability of OpenPose-Based Motion Analysis in Measuring Knee Valgus during Drop Vertical Jump Test
Takumi Ino, Mina Samukawa, Tomoya Ishida, Naofumi Wada, Yuta Koshino, Satoshi Kasahara, Harukazu Tohyama
Journal of Sports Science and Medicine, 515, 525, Journal of Sports Science and Medicine, 2024年09月09日
研究論文（学術雑誌）, OpenPose-based motion analysis (OpenPose-MA), utilizing deep learning methods, has emerged as a compelling technique for estimating human motion. It addresses the drawbacks associated with conventional three-dimensional motion analysis (3D-MA) and human visual detection-based motion analysis (Human-MA), including costly equipment, time-consuming analysis, and restricted experimental settings. This study aims to assess the precision of OpenPose-MA in comparison to Human-MA, using 3D-MA as the reference standard. The study involved a cohort of 21 young and healthy adults. OpenPose-MA employed the OpenPose algorithm, a deep learning-based open-source two-dimensional (2D) pose estimation method. Human-MA was conducted by a skilled physiotherapist. The knee valgus angle during a drop vertical jump task was computed by OpenPose-MA and Human-MA using the same frontal-plane video image, with 3D-MA serving as the reference standard. Various metrics were utilized to assess the reproducibility, accuracy and similarity of the knee valgus angle between the different methods, including the intraclass correlation coefficient (ICC) (1, 3), mean absolute error (MAE), coefficient of multiple correlation (CMC) for waveform pattern similarity, and Pearson’s correlation coefficients (OpenPose-MA vs. 3D-MA, Human-MA vs. 3D-MA). Unpaired t-tests were conducted to compare MAEs and CMCs between OpenPose-MA and Human-MA. The ICCs (1,3) for OpenPose-MA, Human-MA, and 3D-MA demonstrated excellent reproducibility in the DVJ trial. No significant difference between OpenPose-MA and Human-MA was observed in terms of the MAEs (OpenPose: 2.4° [95%CI: 1.9-3.0°], Human: 3.2° [95%CI: 2.1-4.4°]) or CMCs (OpenPose: 0.83 [range: 0.99-0.53], Human: 0.87 [range: 0.24-0.98]) of knee valgus angles. The Pearson’s correlation coefficients of OpenPose-MA and Human-MA relative to that of 3D-MA were 0.97 and 0.98, respectively. This study demonstrated that OpenPose-MA achieved satisfactory reproducibility, accuracy and exhibited waveform similarity comparable to 3D-MA, similar to Human-MA. Both OpenPose-MA and Human-MA showed a strong correlation with 3D-MA in terms of knee valgus angle excursion.

Acute effects of different rest period durations after warm-up and dynamic stretching on endurance running performance in male runners
Taichi Yamaguchi, Kazuki Takizawa, Keisuke Shibata, Nobuyasu Tomabechi, Mina Samukawa, Masanori Yamanaka
Sport Sciences for Health, 20, 3, 763, 771, 2024年09月, ［査読有り］
英語, 研究論文（学術雑誌）

Effects of Different Amounts of Dynamic Stretching on Musculotendinous Extensibility and Muscle Strength
Minori Tanaka, Yuta Koshino, Kensuke Oba, Fuma Sentoku, Miho Komatsuzaki, Naoto Kyotani, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama, Mina Samukawa
Applied Sciences, 14, 15, 6745, 6745, MDPI AG, 2024年08月02日
研究論文（学術雑誌）, Dynamic stretching (DS) is performed as a warm-up to improve the range of motion and athletic performance. However, the effect of different amounts of DS on muscle performance remains unclear. This study investigated the effects of DS repetitions with one or four sets of 30 s on musculotendinous extensibility and muscle strength. Fourteen healthy men (23.6 ± 1.5 years) underwent DS to ankle plantar flexors for one set (fifteen repetitions) or four sets after warm-up. The maximal ankle dorsiflexion angle, musculotendinous stiffness (MTS), passive torque, peak plantarflexion torque during maximal isometric contraction, and muscle temperature were measured before and after stretching. A significant effect of time was observed on the maximal ankle dorsiflexion angle, MTS, passive torque, and muscle temperature (p < 0.001). However, no interactions or effects between the conditions were observed. After DS, the maximal ankle dorsiflexion angle and muscle temperature significantly increased (p < 0.01), while the MTS and passive torque significantly decreased (p < 0.01). The maximal muscle strength showed no significant effects or interactions (p = 0.198−0.439). These results indicated that one and four sets of DS effectively increased musculotendinous extensibility. Thus, one set of DS may have similar effects as a warm-up before four sets of DS.

Abductor hallucis muscle activity during short foot exercise in combination with static and dynamic functional tasks
Yuta Koshino, Mana Kimura, Mina Samukawa, Satoshi Kasahara, Tomoya Ishida, Harukazu Tohyama
Gait & Posture, Elsevier BV, 2024年08月
研究論文（学術雑誌）

Relationship among the COM Motion, the Lower Extremity and the Trunk during the Squat.
Satoshi Kasahara, Tomoya Ishida, Jiang Linjing, Ami Chiba, Mina Samukawa, Harukazu Tohyama
Journal of human kinetics, 93, 29, 39, 2024年07月, ［国際誌］
英語, 研究論文（学術雑誌）, Squatting is a common motion in activities of daily living and is frequently used in training programs. Squatting requires a shift of the body in both vertical and anterior-posterior directions. Postural control during squatting is considered a mixed strategy; however, details and roles of the trunk and lower limb joints are unclear. The purpose of this study was to investigate the relationship among the kinematics of the lower limb, the trunk and the center of mass (COM) descent during squatting. Twenty-six healthy young adults performed repeated parallel squats. Lower limb joint and trunk angles and the COM were analyzed using a 3D motion analysis system. We evaluated the relationship between the kinematics and the squat depth by performing correlation analysis and multiple linear regression analysis. The ankle was the first to reach its maximum angle, and the remaining joints reached their maximum angles at the maximum squat depth. The knee joint motion and the squat depth were significantly correlated and there was a correlation between the hip and the ankle joint motion and the anteroposterior displacement of the COM during squatting. Multivariate linear regression analysis indicated that squat depth was predicted by both the knee and ankle motion and that anteroposterior displacement of the COM was predicted by the hip, ankle, and knee joint motion. The knees contributed to the vertical COM motion during squatting, while the hips contributed to the COM motion in the anteroposterior direction. On the other hand, the ankles contributed to COM motions in both the vertical and anteroposterior directions during squatting.

The relationship between joint kinematic patterns during single-leg drop landing and perceived instability in individuals with chronic ankle instability.
Kentaro Watanabe, Yuta Koshino, Kosumi Nakagawa, Tomoya Ishida, Satoshi Kasahara, Mina Samukawa, Harukazu Tohyama
Clinical biomechanics (Bristol, Avon), 114, 106237, 106237, 2024年04月05日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Perceived instability is a primary symptom among individuals with chronic ankle instability. However, the relationship between joint kinematics during landing remains unclear. Therefore, we investigated the relationships between landing kinematics and perceived instability in individuals with chronic ankle instability. METHODS: In 32 individuals with chronic ankle instability, we recorded ankle, knee, and hip joint angles during a single-leg drop landing. Joint angle waveforms during 200 ms before and after initial contact were summarized into single values using two methods: peak joint angles and principal component scores via principal component analysis. Using Spearman's rank correlation coefficient (ρ), we examined the relationships of peak joint angles and principal component scores with the Cumberland Ankle Instability Tool score, with a lower score indicating a greater perceived instability (α = 0.05). FINDINGS: The second principal component scores of ankle angle in the horizontal and sagittal planes significantly correlated with the Cumberland Ankle Instability Tool score (Horizontal: ρ = 0.507, P = 0.003; Sagittal: ρ = -0.359, P = 0.044). These scores indicated the differences in the magnitude of angles before and after landing. Significant correlations indicated a greater perceived instability correlated with smaller internal rotation and plantarflexion before landing and smaller external rotation and dorsiflexion after landing. In contrast, no peak joint angles correlated with the Cumberland Ankle Instability Tool score (P > 0.05). INTERPRETATION: In individuals with chronic ankle instability, ankle movements during landing associated with perceived instability may be a protective strategy before landing and potentially cause ankle instability after landing.

Combined Effects of Static and Dynamic Stretching on the Muscle-Tendon Unit Stiffness and Strength of the Hamstrings.
Takeuchi K, Nakamura M, Matsuo S, Samukawa M, Yamaguchi T, Mizuno T
Journal of strength and conditioning research, 2024年04月
研究論文（学術雑誌）

The Effects of Active Stretching Exercise on Mood and Autonomic Modulation in Middle-Aged Women
Miho Komatsuzaki, Yuta Koshino, Tomoya Ishida, Satoshi Kasahara, Fiorella Apolo Soria, Yasuhiko Ebina, Harukazu Tohyama, Mina Samukawa
Women's Health Reports, 5, 1, 680, 688, Mary Ann Liebert Inc, 2024年04月01日
研究論文（学術雑誌）

Relationship between onset of trunk muscle activities and pelvic kinematics in individuals with and without chronic low back pain.
Akimi Nakata, Satoshi Osuka, Tomoya Ishida, Yuki Saito, Yuta Koshino, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Journal of back and musculoskeletal rehabilitation, 2024年03月19日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Lumbopelvic movement patterns during prone hip extension has been proposed as a clinical screening method for trunk muscle dysfunction in patients with chronic low back pain (CLBP). However, correlations between trunk muscle onset and pelvic kinematics have not been investigated. OBJECTIVE: To examine the correlation between trunk muscle onset and pelvic kinematics during prone hip extension in participants with CLBP. METHODS: Fifteen patients with CLBP and 15 healthy individuals participated. We evaluated the muscle activities of the lumbar multifidus, the longissimus, and the semitendinosus via electromyogram and the displacement angles of the pelvic tilt, oblique and rotation. RESULTS: The onset of the multifidus at the ipsilateral side of hip extension was significantly delayed in the patients with CLBP compared to the control group (P< 0.001). The onset of the ipsilateral multifidus in the control group was significantly correlated with increased anterior pelvic tilt angle (P= 0.019, r= 0.597), whereas no significant correlation was observed in the CLBP group (P= 0.810, r=-0.068). CONCLUSION: The results suggest that pelvic kinematics during prone hip extension does not predict the delayed trunk muscle onset in patients with CLBP.

The Difference in the Assessment of Knee Extension/Flexion Angles during Gait between Two Calibration Methods for Wearable Goniometer Sensors
Tomoya Ishida, Mina Samukawa
Sensors, 2024年03月
研究論文（学術雑誌）

Effect of suspensory strategy on balance recovery after lateral perturbation.
Linjing Jiang, Satoshi Kasahara, Tomoya Ishida, Yuta Koshino, Ami Chiba, Yuting Wei, Mina Samukawa, Harukazu Tohyama
Human movement science, 94, 103184, 103184, 2024年02月07日, ［国際誌］
英語, 研究論文（学術雑誌）, Postural stability is essential for performing daily activities and preventing falls, whereby suspensory strategy with knee flexion may play a role in postural control. However, the contribution of the suspensory strategy for postural control during sudden lateral perturbation remains unclear. We aimed to determine how suspensory strategy contributed to postural adjustment during sudden perturbation in the lateral direction and what knee flexion setting maximized its effect. Eighteen healthy young adults (10 male and 8 female) participated in this study. Kinematic data during lateral perturbation at three velocities (7, 15, and 20 cm/s) were collected under three knee flexion angle conditions (0°, 15°, and 65°) using motion capture technology. Postural adjustments to the external perturbation were assessed by four parameters related to the temporal aspects of the center of mass (COM): reaction time, peak displacement/time and reversal time, and minimum value of the margin of stability (minimum-MOS). Our results showed that the COM height before the perturbation significantly lowered with increasing knee flexion angle. The COM reaction times for low and mid perturbation velocities were delayed at 65° of knee flexion compared to 0° and 15°, and the COM reversal times were significantly shorter at 65° of knee flexion than at 0° and 15° across all perturbation velocities. The minimum-MOS at the high-velocity of perturbation was significantly smaller at 65° of knee flexion than at 0° and 15°. In conclusion, the adoption of a suspensory strategy with slight knee flexion induced enhanced stability during sudden external and lateral perturbations. However, excessive knee flexion induced instability.

Trunk Muscle Activity and Ratio of Local Muscle to Global Muscle Activity during Supine Bridge Exercises under Unstable Conditions in Young Participants with and without Chronic Low Back Pain
Akimi Nakata, Satoshi Osuka, Tomoya Ishida, Yuki Saito, Mina Samukawa, Satoshi Kasahara, Yuta Koshino, Naoki Oikawa, Harukazu Tohyama
Healthcare, 2024年02月
研究論文（学術雑誌）

Estimation of Vertical Ground Reaction Force during Single-leg Landing Using Two-dimensional Video Images and Pose Estimation Artificial Intelligence
Tomoya ISHIDA, Takumi INO, Yoshiki YAMAKAWA, Naofumi WADA, Yuta KOSHINO, Mina SAMUKAWA, Satoshi KASAHARA, Harukazu TOHYAMA
Physical Therapy Research, Japanese Physical Therapy Association, 2024年
研究論文（学術雑誌）

Acute effects of static and dynamic stretching for ankle plantar flexors on postural control during the single-leg standing task.
Kensuke Oba, Naoto Kyotani, Minori Tanaka, Miho Komatsuzaki, Satoshi Kasahara, Katsuhiko Ogasawara, Mina Samukawa
Sports biomechanics, 1, 11, 2023年12月27日, ［責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, Static stretching (SS) and dynamic stretching (DS) are widely used as warm-ups before sports. However, whether stretching affects postural control remains unclear. We compared the effects of SS and DS on the plantar flexors and postural control during single-leg standing. Fifteen healthy young participants performed SS, DS, or no stretching (control). The stretch condition consisted of four sets lasting 30 s each. The control condition was a rest with standing for 210 s. Center of pressure (COP) displacement was measured using a force plate before and after each intervention to assess postural control during the single-leg standing task. The COP area, COP velocity, and anteroposterior (COPAP) and mediolateral (COPML) range were calculated. DS significantly decreased in the COPML range (21.5 ± 4.1 to 19.0 ± 2.5 mm; P = 0.02), COP velocity (33.8 ± 7.6 to 29.8 ± 6.5 mm/s; P < 0.01), and COP area (498.6 ± 148.3 to 393.3 ± 101.1 mm2; P < 0.01), whereas SS did not change in the COP parameters (COP area 457.2 ± 108.3 to 477.8 ± 106.1 mm2, P = .49; COP velocity 31.2 ± 4.2 to 30.7 ± 5.8 mm/s, P = 0.60; COPAP 25.4 ± 3.1 to 25.3 ± 3.2 mm, P = 0.02; COPML 20.7 ± 3.3 to 21.1 ± 2.5 mm, P = 0.94). Therefore, DS of the plantar flexors enhances postural control during single-leg standing and may be effective for both injury prevention and performance enhancement.

Sex-related differences in stretch-induced musculotendinous stiffness changes
Miho Komatsuzaki, Mina Samukawa, Kensuke Oba, Yuta Koshino, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama
Sport Sciences for Health, Springer Science and Business Media LLC, 2023年12月16日, ［責任著者］
研究論文（学術雑誌）

Validity of AI-Based Gait Analysis for Simultaneous Measurement of Bilateral Lower Limb Kinematics Using a Single Video Camera
Takumi Ino, Mina Samukawa, Tomoya Ishida, Naofumi Wada, Yuta Koshino, Satoshi Kasahara, Harukazu Tohyama
Sensors, 23, 24, 9799, 9799, MDPI AG, 2023年12月13日, ［責任著者］
研究論文（学術雑誌）, Accuracy validation of gait analysis using pose estimation with artificial intelligence (AI) remains inadequate, particularly in objective assessments of absolute error and similarity of waveform patterns. This study aimed to clarify objective measures for absolute error and waveform pattern similarity in gait analysis using pose estimation AI (OpenPose). Additionally, we investigated the feasibility of simultaneous measuring both lower limbs using a single camera from one side. We compared motion analysis data from pose estimation AI using video footage that was synchronized with a three-dimensional motion analysis device. The comparisons involved mean absolute error (MAE) and the coefficient of multiple correlation (CMC) to compare the waveform pattern similarity. The MAE ranged from 2.3 to 3.1° on the camera side and from 3.1 to 4.1° on the opposite side, with slightly higher accuracy on the camera side. Moreover, the CMC ranged from 0.936 to 0.994 on the camera side and from 0.890 to 0.988 on the opposite side, indicating a “very good to excellent” waveform similarity. Gait analysis using a single camera revealed that the precision on both sides was sufficiently robust for clinical evaluation, while measurement accuracy was slightly superior on the camera side.

Change in sensory integration and regularity of postural sway with the suspensory strategy during static standing balance
Linjing Jiang, Satoshi Kasahara, Tomoya Ishida, Yuta Koshino, Ami Chiba, Kazumasa Yoshimi, Yuting Wei, Mina Samukawa, Harukazu Tohyama
Frontiers in Neurology, 14, Frontiers Media SA, 2023年10月31日
研究論文（学術雑誌）, Background and aim

The suspensory strategy, a method for controlling postural balance in the vertical direction of the center of mass (COM), is considered by the elderly as a means of balance control. The vertical COM control might alter the sensory integration and regularity of postural sway, which in turn impacts balance. However, to date, this was not confirmed. Thus, this study aimed at investigating the influence of the suspensory strategy achieved through knee flexion on the static standing balance.

Methods

Nineteen participants were monitored at knee flexion angles of 0°, 15°, and 65°. Time-frequency analysis and sample entropy were employed to analyze the COM data. Time-frequency analysis was utilized to assess the energy content across various frequency bands and corresponding percentage of energy within each frequency band. The outcomes of time-frequency are hypothesized to reflect the balance-related sensory input and sensory weights. Sample entropy was applied to evaluate the regularity of the COM displacement patterns.

Results

Knee flexion led to a decreased COM height. The highest energy content was observed at 65° knee flexion, in contrast with the lowest energy observed at 0° in both the anterior–posterior (AP) and medial-lateral (ML) directions. Additionally, the ultra-low-frequency band was more pronounced at 65° than that at 0° or 15° in the ML direction. Furthermore, the COM amplitudes were notably higher at 65° than those at 0° and 15° in the AP and ML directions, respectively. The sample entropy values were lower at 65° and 15° than those at 0° in the ML direction, with the lowest value observed at 65° in the vertical direction.

Conclusion

The suspensory strategy could enhance the sensory input and cause sensory reweighting, culminating in a more regular balance control. Such suspensory strategy-induced postural control modifications may potentially provide balance benefits for people with declining balance-related sensory, central processing, and musculoskeletal system functions.

Hip and knee kinematics, center of pressure position, and ground reaction force are associated with Achilles tendon force during jump landing.
Yuta Koshino, Tomoya Ishida, Shohei Taniguchi, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Scandinavian journal of medicine & science in sports, 2023年10月03日, ［国際誌］
英語, 研究論文（学術雑誌）, PURPOSE: Jump-landing exercises are often performed during the rehabilitation of Achilles tendon (AT) injuries. However, the factors that affect the AT force (ATF) during landing are unclear. This study aimed to determine the kinematics and ground reaction force (GRF) variables associated with the peak ATF during a drop vertical jump (DVJ). METHODS: The landing phase of DVJ was evaluated in 101 healthy participants (46 males, age: 21.2 ± 1.4 years old) using a three-dimensional motion analysis system with two force plates. ATF was estimated from the ankle flexion angle and moment. Univariate and multivariate regression analyses were performed with the peak ATF as the dependent variable. The vertical GRF (VGRF), center of pressure (COP), forward trunk leaning, hip/knee/ankle joint angles at peak ATF, and sex were used as independent variables. RESULTS: In the univariate regression analysis, larger VGRF (β = 0.813), more anterior COP position (β = 0.214), smaller knee flexion (β = -0.251) and adduction (β = -0.252), smaller hip flexion (β = -0.407), smaller forward trunk lean (β = -0.492), and male sex (β = -0.282) were significantly associated with a larger peak ATF. Multivariate analysis revealed that larger VGRF (β = 1.018), more anterior COP position (β = 0.320), a larger knee (β = 0.442), and smaller hip flexion (β = -0.205) were associated with the larger peak ATF. CONCLUSIONS: The VGRF, COP position, and knee and hip flexion were independently associated with ATF. Modifying these factors may be useful in managing tendon loading during jump-landing exercises.

Association of Psychological Readiness to Return to Sports With Subjective Level of Return at 12 Months After ACL Reconstruction.
Makoto Suzuki, Tomoya Ishida, Hisashi Matsumoto, Satoru Kaneko, Chiharu Inoue, Yoshimitsu Aoki, Harukazu Tohyama, Mina Samukawa
Orthopaedic journal of sports medicine, 11, 9, 23259671231195030, 23259671231195030, 2023年09月, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Return-to-sports (RTS) rates after anterior cruciate ligament (ACL) reconstruction (ACLR) differ according to the level at which patients return. It is unclear whether the level of RTS is affected by psychological readiness to return. PURPOSE: To examine the association between psychological readiness to RTS and subjective RTS level 12 months after ACLR. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: A total of 47 patients who underwent unilateral primary ACLR surgery were enrolled. Assessments at 6 and 12 months postoperatively consisted of knee strength testing (isokinetic quadriceps and hamstring strength), the International Knee Documentation Committee Subjective Knee Evaluation Form (IKDC-SKF), and the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI) scale to measure psychological readiness to RTS. Patients were assigned to 1 of 3 subgroups based on their subjective assessment of RTS level at 12 months postoperatively: RTS at or above preinjury level (RTS≥Pre; n = 19), RTS below preinjury level (RTS

Factors associated with persistent pain in college athletes with a history of lateral ankle sprain.
Yuta Koshino, Kentaro Watanabe, Moeko Akimoto, Tomoya Ishida, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 64, 27, 31, 2023年08月30日, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVES: To determine the factors associated with and prevalence of persistent pain in college athletes with chronic ankle instability (CAI) and with previous lateral ankle sprain (LAS) without CAI. DESIGN: Cross-Sectional Study. SETTING: Online survey at one university. PARTICIPANTS: Of the 385 respondents surveyed online, 140 were identified as having experienced at least one LAS (CAI group: 69, coper group: 24, LAS group not classified as either: 47). MAIN OUTCOME MEASURES: Factors associated with the presence of pain during activities of daily living (ADL) and sports were identified using multivariate logistic regression analyses. Independent variables were demographics, injury characteristics, the Identification of Functional Ankle Instability (IdFAI) score, the Foot and Ankle Ability Measure Sports (FAAM-Sports) and ADL subscales, and the Tampa Scale for Kinesiophobia-11 score. RESULTS: The prevalence of pain during ADL and sports in the three groups was 16.7%-42.0% and 33.3%-56.5%, respectively. FAAM-Sports and IdFAI score were significantly associated with pain during ADL and sports in the CAI group (odd ratio: 0.923 and 1.145), respectively. No significant pain-related factors were found in the coper and LAS groups. CONCLUSIONS: Lower self-reported function and greater perceived ankle instability may be important factors in pain management in athletes with CAI.

Physical therapist-led interventions based on the Biopsychosocial Model provide improvement in disability and pain for spinal disorders: A systematic review and meta-analysis.
Takahiro Miki, Yu Kondo, Hiroshi Kurakata, Tsuneo Takebayashi, Mina Samukawa
PM & R : the journal of injury, function, and rehabilitation, 2023年06月02日, ［責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVE: To summarize the effects of physical therapist-led interventions based on the biopsychosocial (BPS) model in spinal disorders compared interventions with no BPS model through a systematic review and meta-analysis of randomized controlled trials (RCTs). LITERATURE SURVEY: We searched in the Web of Science, CENTRAL, MEDLINE, PsycINFO, CINAHL, and PEDro up to October 27th, 2022. METHODOLOGY: Pain intensity and disability as primary outcomes and psychological factors as secondary outcomes in spinal disorders. The included intervention was physical therapist-led interventions based on the BPS model. The control group received no physiotherapy intervention for BPS. Pooled effects were analyzed as standardized mean differences (SMD) and 95% confidence intervals (CI) and the random-effects model was used for the meta-analysis. The subgroup analysis was divided into low back group and neck pain group. Another subgroup analysis was conducted only of the groups that had received training of the BPS model. SYNTHESIS: Fifty-seven studies with 3648 participants met the inclusion criteria. For pain intensity, there was a statistically significant effect in the short, medium and long terms. The SMD with 95% CI were -0.44 (-0.62, -0.27), -0.24 (-0.37, -0.12) and -0.17 (-0.28, -0.06), respectively. Outcomes were clinically significant, except in the long term. For disability, there was a statistically significant effect in the short, medium and long terms. The SMD with 95% CI were -0.48( -0.69 to -0.27), -0.44 (-0.64, -0.25) and -0.37 (-0.58, -0.15), respectively. All periods were clinically significant. The quality of the evidence was low for all of the main outcomes for all of the terms. CONCLUSION: Physical therapist-led interventions based on the BPS model effectively improve pain intensity and disability in spinal disorders based on low quality evidence. This article is protected by copyright. All rights reserved.

Interlimb Asymmetry in Knee Extension Moment During Double-Leg Squatting Is Associated With Persistent Quadriceps Weakness After ACL Reconstruction.
Tomoya Ishida, Mina Samukawa, Yuta Koshino, Takumi Ino, Satoshi Kasahara, Harukazu Tohyama
Orthopaedic journal of sports medicine, 11, 6, 23259671231182105, 23259671231182105, 2023年06月, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Although double-leg squatting is less dynamic and places less demand on the quadriceps compared with landing tasks, the relationship between double-leg squatting biomechanics and persistent quadriceps weakness after anterior cruciate ligament reconstruction (ACLR) is unknown. PURPOSE: To clarify the relationships between asymmetries in quadriceps strength and lower limb biomechanics during double-leg squatting >1 year after ACLR. STUDY DESIGN: Controlled laboratory study. METHODS: A total of 26 participants (5.5 ± 3.8 years after ACLR) were enrolled. The limb symmetry index (LSI) of isokinetic quadriceps strength was used to divide participants into the high-quadriceps (HQ) group (LSI ≥90%; n = 18) and the low-quadriceps (LQ) group (LSI <90%; n = 8). The knee, hip, and ankle extension moment (relative to body weight and support moment [sum of knee, hip, and ankle moments]) and vertical ground-reaction force during double-leg squatting were analyzed using 3-dimensional motion analysis. The association of quadriceps strength and biomechanical variables was tested using 2-way analysis of variance and univariate regression analysis. RESULTS: A significant group-by-limb interaction was found for the peak knee extension moment and the ratios of knee and hip extension moment to support moment (P < .001, P = .015 and P < .001, respectively). The LQ group showed a significantly smaller peak knee extension moment and knee to support moment ratio but a larger hip to support moment ratio in the involved limb than in the uninvolved limb (95% CIs: knee extension moment, -0.273 to -0.088 N·m/kg; knee to support moment ratio, -10.7% to -2.2%; hip to support moment ratio, 3.2% to 8.5%). No interlimb difference was found for the HQ group. The LSI of quadriceps strength was significantly associated with the LSI of peak knee extension moment (R2 = 0.183), knee to support moment ratio (R2 = 0.256), and hip to support moment ratio (R2 = 0.233). The mean maximum isokinetic quadriceps strength and peak knee extension moment during squatting on the involved limb of the LQ group were 2.40 ± 0.39 and 0.90 ± 0.16 N·m/kg, respectively. CONCLUSION: Asymmetrical biomechanics during double-leg squatting was associated with persistent quadriceps weakness after ACLR. The LQ group had reduced knee extensor moment on the involved side during squatting despite loading at approximately half the maximum strength. CLINICAL RELEVANCE: Quadriceps strengthening exercises, together with interventions to improve neuromuscular control, may reduce asymmetrical biomechanics during double-leg squatting.

Trunk Muscle Activities during Ergometer Rowing in Rowers with and without Low Back Pain.
Momoko Yamashita, Tomoya Ishida, Satoshi Osuka, Kentaro Watanabe, Mina Samukawa, Satoshi Kasahara, Eiji Kondo, Harukazu Tohyama
Journal of sports science & medicine, 22, 2, 338, 344, 2023年06月, ［国際誌］
英語, 研究論文（学術雑誌）, This study aimed to determine the differences in trunk muscle activity during rowing at maximal effort between rowers with and without low back pain (LBP). Ten rowers with LBP and 12 rowers without LBP were enrolled in this study. All rowers performed a 500-m trial using a rowing ergometer at maximal effort. The amplitudes of the activities of the thoracic erector spinae (TES), lumbar erector spinae (LES), latissimus dorsi (LD), rectus abdominis (RA), and external oblique (EO) muscles were analyzed using a wireless surface electromyography (EMG) system. EMG data at each stroke were converted into 10-time series data by recording averages at every 10% in the 100% stroke cycle and normalized by maximum voluntary isometric contraction in each muscle. Two-way repeated measures analysis of variance was performed. Significant interactions were found in the activities of the TES and LES (P < 0.001 and P = 0.047, respectively). In the post hoc test, the TES activity in the LBP group was significantly higher than that in the control group at the 10% to 20% and 20% to 30% stroke cycles (P = 0.013 and P = 0.007, respectively). The LES activity in the LBP group was significantly higher than that in the control group at the 0% to 10% stroke cycle (P < 0.001). There was a main group effect on the LD activity, with significantly higher activity in the LBP group than in the control group (P = 0.023). There were no significant interactions or main effects in the EO and RA activities between the groups. The present study showed that rowers with LBP compared with those without LBP exhibited significantly higher TES, LES, and LD muscle activities. This indicates that rowers with LBP exhibit excessive back muscle activity during rowing under maximal effort.

Subsequent Jumping Increases the Knee and Hip Abduction Moment, Trunk Lateral Tilt, and Trunk Rotation Motion During Single-Leg Landing in Female Individuals.
Masato Chijimatsu, Tomoya Ishida, Masanori Yamanaka, Shohei Taniguchi, Ryo Ueno, Ryohei Ikuta, Mina Samukawa, Takumi Ino, Satoshi Kasahara, Harukazu Tohyama
Journal of applied biomechanics, 39, 4, 1, 7, 2023年05月24日, ［国際誌］
英語, 研究論文（学術雑誌）, Single-leg landings with or without subsequent jumping are frequently used to evaluate landing biomechanics. The purpose of this study was to investigate the effects of subsequent jumping on the external knee abduction moment and trunk and hip biomechanics during single-leg landing. Thirty young adult female participants performed a single-leg drop vertical jumping (SDVJ; landing with subsequent jumping) and single-leg drop landing (SDL; landing without subsequent jumping). Trunk, hip, and knee biomechanics were evaluated using a 3-dimensional motion analysis system. The peak knee abduction moment was significantly larger during SDVJ than during SDL (SDVJ 0.08 [0.10] N·m·kg-1·m-1, SDL 0.05 [0.10] N·m·kg-1·m-1, P = .002). The trunk lateral tilt and rotation angles toward the support-leg side and external hip abduction moment were significantly larger during SDVJ than during SDL (P < .05). The difference in the peak hip abduction moment between SDVJ and SDL predicted the difference in the peak knee abduction moment (P = .003, R2 = .252). Landing tasks with subsequent jumping would have advantages for evaluating trunk and hip control as well as knee abduction moment. In particular, evaluating hip abduction moment may be important because of its association with the knee abduction moment.

Repetitive Pitching Decreases the Elbow Valgus Stability Provided by the Flexor-Pronator Mass: The Effects of Repetitive Pitching on Elbow Valgus Stability.
Masaya Nara, Mina Samukawa, Kensuke Oba, Tomoya Ishida, Yoshiya Takahashi, Satoshi Kasahara, Harukazu Tohyama
Journal of shoulder and elbow surgery, 32, 9, 1819, 1824, 2023年05月10日, ［責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Baseball pitching induces a large elbow valgus load, stressing the ulnar collateral ligament. Flexor-pronator mass contraction contributes to valgus stability; however, repetitive baseball pitching may weaken the flexor-pronator mass contractile function. The present study investigated the effects of repetitive baseball pitching on the medial valgus stability measured using ultrasonography. We hypothesized that repetitive pitching would decrease elbow valgus stability. METHODS: This was a controlled laboratory study. Fifteen young male baseball players at the collegiate level (age: 23.0 ± 1.4 years) were enrolled. The medial elbow joint space was measured using ultrasonography (B-mode, 12-MHz linear array transducer) in the following three conditions: at rest (unloaded), under 3 kg valgus load (loaded), and under valgus load with maximal grip contraction to activate flexor-pronator mass (loaded-contracted). All measurements were performed before and after the pitching tasks, which comprised five sets of 20 pitches. Two-way repeated-measures analysis of variance was applied to determine changes in the medial elbow joint space. The post-hoc test with Bonferroni adjustment was applied to assess the changes within the time and condition. RESULTS: The medial elbow joint space was significantly greater under the loaded than the unloaded and loaded-contracted conditions both before- and after- pitching (p < 0.001). In the loaded-contracted condition, the medial elbow joint space significantly increased after repetitive baseball pitching (p < 0.001). CONCLUSIONS: The results of the present study indicated that repetitive baseball pitching reduced the elbow valgus stability. This reduction could be attributed to the decreased flexor-pronator mass contractile function. Insufficient contraction may increase the tensile load on the ulnar collateral ligament with pitching. Flexor-pronator mass contraction plays a role in narrowing the medial elbow joint space; however, repetitive baseball pitching reduced the elbow valgus stability. It has been suggested that sufficient rest and recovery of the flexor-pronator mass function are required to reduce the ulnar collateral ligament injury risk.

Validity and Reliability of a Wearable Goniometer Sensor Controlled by a Mobile Application for Measuring Knee Flexion/Extension Angle during the Gait Cycle.
Tomoya Ishida, Mina Samukawa
Sensors (Basel, Switzerland), 23, 6, 2023年03月20日, ［最終著者, 責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, Knee kinematics during gait is an important assessment tool in health-promotion and clinical fields. This study aimed to determine the validity and reliability of a wearable goniometer sensor for measuring knee flexion angles throughout the gait cycle. Twenty-two and seventeen participants were enrolled in the validation and reliability study, respectively. The knee flexion angle during gait was assessed using a wearable goniometer sensor and a standard optical motion analysis system. The coefficient of multiple correlation (CMC) between the two measurement systems was 0.992 ± 0.008. Absolute error (AE) was 3.3 ± 1.5° (range: 1.3-6.2°) for the entire gait cycle. An acceptable AE (<5°) was observed during 0-65% and 87-100% of the gait cycle. Discrete analysis revealed a significant correlation between the two systems (R = 0.608-0.904, p ≤ 0.001). The CMC between the two measurement days with a 1-week interval was 0.988 ± 0.024, and the AE was 2.5 ± 1.2° (range: 1.1-4.5°). A good-to-acceptable AE (<5°) was observed throughout the gait cycle. These results indicate that the wearable goniometer sensor is useful for assessing knee flexion angle during the stance phase of the gait cycle.

Prediction of postoperative disability in patients with degenerative diseases of the lumbar spine using preoperative psychological factors
Miki T, Samukawa M, Higuchi D, Kondo Y, Watanabe Y, Takebayashi T, Ishida T, Kasahara S, Tohyama H
2023年03月
研究論文（学術雑誌）

Kinesiophobia, self-reported ankle function, and sex are associated with perceived ankle instability in college club sports athletes with chronic ankle instability
Kentaro Watanabe, Yuta Koshino, Daiki Kawahara, Moeko Akimoto, Masumi Mishina, Kosumi Nakagawa, Tomoya Ishida, Satoshi Kasahara, Mina Samukawa, Harukazu Tohyama
Physical Therapy in Sport, 61, 45, 50, Elsevier BV, 2023年02月
研究論文（学術雑誌）

Pelvic Rotation Is Associated With Asymmetry in the Knee Extensor Moment During Double-Leg Squatting After Anterior Cruciate Ligament Reconstruction.
Tomoya Ishida, Mina Samukawa, Yuta Koshino, Takumi Ino, Satoshi Kasahara, Harukazu Tohyama
Journal of applied biomechanics, 39, 1, 1, 7, 2023年01月17日, ［国際誌］
英語, 研究論文（学術雑誌）, Asymmetry in knee extensor moment during double-leg squatting was observed after anterior cruciate ligament reconstruction, even after the completion of the rehabilitation program for return to sports. The purpose of this study was to clarify the association between asymmetry in the knee extensor moment and pelvic rotation angle during double-leg squatting after anterior cruciate ligament reconstruction. Twenty-four participants performed double-leg squatting. Kinetics and kinematics during squatting were analyzed using a 3-dimensional motion analysis system with 2 force plates. The limb symmetry index of knee extensor moment was predicted by the pelvic rotation angle (R2 = .376, P = .001). In addition, the pelvic rotation and the limb symmetry index of the vertical ground reaction force independently explained the limb symmetry index of the knee extensor moment (R2 = .635, P < .001, β of pelvic rotation = -0.489, β of vertical ground reaction force = 0.524). Pelvic rotation toward the involved limb was associated with a smaller knee extensor moment in the involved limb than in the uninvolved limb. The assessment of pelvic rotation would be useful for partially predicting asymmetry in the knee extensor moment during double-leg squatting. Minimizing pelvic rotation may improve the asymmetry in the knee extensor moment during double-leg squatting after anterior cruciate ligament reconstruction.

Evaluation of Lower-Limb Kinematics during Timed Up and Go (TUG) Test in Subjects with Locomotive Syndrome (LS) Using Wearable Gait Sensors (H-Gait System).
Yoshiaki Kataoka, Yuki Saito, Ryo Takeda, Tomoya Ishida, Shigeru Tadano, Teppei Suzuki, Kentaro Nakamura, Akimi Nakata, Satoshi Osuka, Satoshi Yamada, Mina Samukawa, Harukazu Tohyama
Sensors (Basel, Switzerland), 23, 2, 2023年01月06日, ［国際誌］
英語, 研究論文（学術雑誌）, Few studies have dealt with lower-limb kinematics during the timed up and go (TUG) test in subjects with locomotive syndrome (LS). This study aimed to evaluate the characteristics of lower-limb kinematics during the TUG test in subjects with LS using the wearable sensor-based H-Gait system. A total of 140 participants were divided into the non-LS (n = 28), the LS-stage 1 (n = 78), and LS-stage 2 (n = 34) groups based on the LS risk test. Compared with the non-LS group, the LS-stage 1 and LS-stage 2 groups showed significantly smaller angular velocity of hip and knee extension during the sit-to-stand phase. The LS-stage 2 group showed significantly smaller peak angles of hip extension and flexion during the walking-out phase compared to the non-LS group. These findings indicate that the evaluation of the lower-limb kinematics during the TUG test using the H-Gait system is highly sensitive to detect LS, compared with the evaluation of the lower-limb kinematics when simply walking.

Dual-Task Interference Slows Down Proprioception.
Linjing Jiang, Satoshi Kasahara, Tomoya Ishida, Yuting Wei, Ami Chiba, Mina Samukawa, Harukazu Tohyama
Motor control, 27, 3, 1, 15, 2023年01月04日, ［国際誌］
英語, 研究論文（学術雑誌）, It is well-known that multitasking impairs the performance of one or both of the concomitant ongoing tasks. Previous studies have mainly focused on how a secondary task can compromise visual or auditory information processing. However, despite dual tasking being critical to motor performance, the effects of dual-task performance on proprioceptive information processing have not been studied yet. The purpose of the present study was, therefore, to investigate whether sensorimotor task performance would be affected by the dual task and if so, in which phase of the sensorimotor task performance would this negative effect occur. The kinematic variables of passive and active knee movements elicited by the leg drop test were analyzed. Thirteen young adults participated in the study. The dual task consisted of performing serial subtractions. The results showed that the dual task increased both the reaction time to counteract passive knee-joint movements in the leg drop test and the threshold to detect those movements. The dual task did not affect the speed and time during the active knee movement and the absolute angle error between the final and the target knee angles. Furthermore, the results showed that the time to complete the sensorimotor task was prolonged in dual tasking. Our findings suggest that dual tasking reduces motor performance due to slowing down proprioceptive information processing without affecting movement execution.

Inertial Sensor-Based Assessment of Static Balance in Athletes with Chronic Ankle Instability
Yuta Koshino, Moeko Akimoto, Daiki Kawahara, Kentaro Watanabe, Tomoya Ishida, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Journal of Sports Science and Medicine, 22, 1, 36, 43, 2023年01月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, The Balance Error Scoring System (BESS), a subjective examiner-based assessment, is often employed to assess postural balance in individuals with chronic ankle instability (CAI); however, inertial sensors may enhance the detection of balance deficits. This study aimed to compare the BESS results between the CAI and healthy groups using conventional BESS scores and inertial sensor data. The BESS test (six conditions: double-leg, single-leg, and tandem stances on firm and foam surfaces, respectively) was performed for the CAI (n = 16) and healthy control (n = 16) groups with inertial sensors mounted on the sacrum and anterior shank. The BESS score was calculated visually by the examiner by counting postural sway as an error based on the recorded video. The root mean square for resultant acceleration (RMSacc) in the anteroposterior, mediolateral, and vertical directions was calculated from each inertial sensor affixed to the sacral and shank surfaces during the BESS test. The mixed-effects analysis of variance and unpaired t-test were used to assess the effects of group and condition on the BESS scores and RMSacc. No significant between-group differences were found in the RMSacc of the sacral and shank surfaces, and the BESS scores (P > 0.05), except for the total BESS score in the foam condition (CAI: 14.4 ± 3.7, control: 11.7 ± 3.4; P = 0.039). Significant main effects of the conditions were found with respect to the BESS scores and RMSacc for the sacral and anterior shank (P < 0.05). The BESS test with inertial sensors can detect differences in the BESS conditions for athletes with CAI. However, our method could not detect any differences between the CAI and healthy groups.

The necessity of female athlete triad education for postpartum women: a case study on insufficient health education
Shizuka Torashima, Mina Samukawa, Mikako Sakamaki-Sunaga
GAZZETTA MEDICA ITALIANA ARCHIVIO PER LE SCIENZE MEDICHE, 181, 12, 992, 998, 2022年12月
英語, 研究論文（学術雑誌）

The center of pressure position in combination with ankle dorsiflexion and trunk flexion is useful in predicting the contribution of the knee extensor moment during double-leg squatting
Tomoya Ishida, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
BMC Sports Science, Medicine and Rehabilitation, 14, 1, Springer Science and Business Media LLC, 2022年12月
研究論文（学術雑誌）, Abstract

Background

Squatting exercises are commonly used in rehabilitation for knee joint disorders; in these exercises, control of knee extensor moment is important to enhance training effects and to avoid adverse effects. Ankle dorsiflexion and trunk flexion are widely used to reduce knee extensor moments during squatting, but the increased load on the low back is a concern. The purpose of this study was to determine whether the anterior–posterior (AP) center-of-pressure (COP) position and the AP-COP position in combination with ankle dorsiflexion and trunk flexion angles can predict the contribution of the knee extensor moment during double-leg squatting.

Methods

Twenty-eight healthy individuals (14 female and 14 male participants, age 22.8 ± 1.3 years) performed three sets of five consecutive double-leg squats. Kinematics and kinetics were analyzed using a three-dimensional motion analysis system with force plates. Univariate and multivariate regression analyses were performed to predict the contribution of the knee extensor moment (% total support moment) from AP-COP position, ankle dorsiflexion, and trunk flexion.

Results

The AP-COP position was a significant predictor of the knee extensor moment contribution (R² = 0.168, P = 0.030). Multivariate analysis showed that the ankle dorsiflexion angle (ΔR² = 0.561, β = 0.842) and AP-COP position (ΔR² = 0.296, β =  − 0.499) predicted the knee extensor moment contribution (model R² = 0.857, P < 0.001). Additionally, the combination of trunk flexion (ΔR² = 0.429, β =  − 0.613) and AP-COP position (ΔR² = 0.109, β =  − 0.332) predicted the knee extensor moment contribution (model R² = 0.538, P < 0.001). The limb symmetry index of the knee extensor moment was significantly associated with that of the AP-COP position (R² = 0.493, P < 0.001) but not with that of the ankle dorsiflexion angle (P = 0.057).

Conclusions

The AP-COP position can predict the contribution of the knee extensor moment and improve the prediction when combined with ankle dorsiflexion and trunk flexion. The present findings suggest that intervention focusing on the AP-COP position in combination with ankle dorsiflexion or trunk flexion would be useful to coordinate the contribution of the knee extensor moment during double-leg squatting.

The effects of relative trunk rotation velocity on ball speed and elbow and shoulder joint torques during baseball pitching.
Yousuke Tanaka, Tomoya Ishida, Takumi Ino, Yuki Suzumori, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Sports biomechanics, 1, 13, 2022年10月12日, ［国際誌］
英語, 研究論文（学術雑誌）, In baseball pitching, suppressing trunk rotation while rotating the pelvis in the early phase of arm cocking is important for throwing a fast ball. However, quantitative evaluation of trunk rotation during pitching has not been established, and its associations with elbow and shoulder torques are unclear. The purpose of this study was to examine the correlation of a new measure of trunk rotation suppression with ball speed and elbow and shoulder torques during pitching. Eighteen adult male baseball pitchers (21.7 ± 1.2 years old) participated. Three qualified pitches were analysed using a three-dimensional motion capture system. Trunk rotation velocity, normalised to the peak velocity, was derived at the time of peak pelvic velocity. Pearson's correlation coefficient was used to determine correlations. The normalised trunk rotation velocity at the peak pelvic velocity was significantly correlated with elbow valgus torque (R = -0.508, P = 0.032), shoulder external rotation torque (R = -0.507, P = 0.032) and ball speed (R = -0.504, P = 0.033). A smaller normalised trunk rotation angular velocity at the time of peak pelvic rotation velocity could increase ball speed but may also increase elbow and shoulder torques among pitchers who demonstrate trunk rotation after foot contact.

Psychological readiness at 9 months after anterior cruciate ligament reconstruction -which factors affect?
Makoto Suzuki, Tomoya Ishida, Hisashi Matsumoto, Satoru Kaneko, Chiharu Inoue, Yoshimitsu Aoki, Harukazu Tohyama, Mina Samukawa
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 58, 74, 79, 2022年10月04日, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVE: To investigate the association of psychological readiness at 9 months after anterior cruciate ligament reconstruction (ACLR) with knee strength and range-of-motion (ROM) at 3 and 9 months postoperatively. DESIGN: Retrospective cohort study. SETTING: Private orthopedic hospital. PARTICIPANTS: Seventy-eight patients after ACLR. MAIN OUTCOMES MEASURES: The participants completed the anterior cruciate ligament-return to sport after injury (ACL-RSI) scale as an assessment of psychological readiness at 9 months after ACLR. Isometric and isokinetic quadriceps and hamstring strength were measured by a dynamometer at 3 and 9 months postoperatively. Knee extension and flexion ROM were measured in 5° increments with a standard goniometer at 3 and 9 months postoperatively. RESULTS: Univariate regression analysis showed that age, limb symmetry index (LSI) of quadriceps strength at 3 and 9 months, and knee extension ROM deficit (>5°) at 3 and 9 months were associated with ACL-RSI scores at 9 months (P < 0.05). Age and LSI of quadriceps strength at 3 months remained significant predictors of ACL-RSI scores at 9 months in multiple regression analysis (R2 = 0.20, P < 0.001). CONCLUSIONS: Early improvements in quadriceps strength after ACLR may have a positive impact on psychological readiness at 9 months postoperatively.

Rate of Torque Development in the Quadriceps after Anterior Cruciate Ligament Reconstruction with Hamstring Tendon Autografts in Young Female Athletes.
Makoto Suzuki, Tomoya Ishida, Mina Samukawa, Hisashi Matsumoto, Yu Ito, Yoshimitsu Aoki, Harukazu Tohyama
International journal of environmental research and public health, 19, 18, 2022年09月18日, ［国際誌］
英語, 研究論文（学術雑誌）, This study aims to compare the limb symmetry index (LSI) of the rate of torque development (RTD) of the quadriceps with that of the peak torque after anterior cruciate ligament reconstruction (ACLR) using semitendinosus and gracilis tendon (STG) autografts and to investigate the associations of the LSI of torque parameters with patient-reported knee function. The participants included 23 female athletes after ACLR with STG grafts. Isometric quadriceps tests were performed using an isokinetic dynamometer. The peak torque, RTD100 (0 to 100 ms) and RTD200 (100 to 200 ms) were determined using torque-time curves. Comparisons of the LSI of torque parameters was performed by ANOVA. Univariate regression analysis was used to examine the relationship between the LSI of torque parameters and the patient-reported knee function. The LSIs of the peak torque and RTD200 were significantly lower than that of the RTD100 (p = 0.049, p = 0.039, respectively). Regression analysis showed that the LSI of the peak torque was associated with the patient-reported knee function (R2 = 0.40, p = 0.001). It would be useful to evaluate the peak torque in young female athletes under the age of 18 and at 8-10 months after ACLR with STG grafts.

Lower limb kinematics during single leg landing in three directions in individuals with chronic ankle instability
Daiki Kawahara, Yuta Koshino, Kentaro Watanabe, Moeko Akimoto, Tomoya Ishida, Satoshi Kasahara, Mina Samukawa, Harukazu Tohyama
Physical Therapy in Sport, 57, 71, 77, Elsevier BV, 2022年09月
研究論文（学術雑誌）

Effects of Changing Center of Pressure Position on Knee and Ankle Extensor Moments During Double-Leg Squatting
Tomoya Ishida, Mina Samukawa, Daisuke Endo, Satoshi Kasahara, Harukazu Tohyama
Journal of Sports Science and Medicine, 341, 346, Journal of Sports Science and Medicine, 2022年06月15日
研究論文（学術雑誌）, The effects of changes in the anterior-posterior center of pressure (AP-COP) position on the lower limb joint moments during double-leg squatting remain unclear. The purpose of this study was to determine the effects of AP-COP positional changes on the hip, knee, and ankle extensor moments during double-leg squatting. Sixteen male participants (22.1 ± 1.5 years) performed double-leg squatting under two conditions (anterior and posterior COP conditions) with visual feedback on their COP positions. Kinematics and kinetics were analyzed using a three-dimensional motion analysis system and force plates. The hip, knee and ankle flexion angles and extensor moments at peak vertical ground reaction force were compared between the two conditions using paired t tests. The COP position was 53.5 ± 2.4% of the foot length, starting from the heel, under the anterior condition and 44.4 ± 2.1% under the posterior condition (P < 0.001). The knee extensor moment was significantly smaller under the anterior than the posterior COP condition (P = 0.003, 95% confidence interval (CI) -0.087 to -0.021 Nm/kg/m), while the ankle extensor moment significantly larger under the anterior COP condition than under the posterior COP condition (P < 0.001, 95% CI 0.113 to 0.147 Nm/kg/m). There was no significant difference in hip extensor moment (P = 0.431). The ankle dorsiflexion angle was significantly larger under the anterior than the posterior COP condition (P = 0.003, 95% CI 0.6 to 2.6°), while there was no difference in trunk, hip, or knee flexion angle. The present results indicate that changes in the AP-COP position mainly affect the ankle and knee extensor moments during double-leg squatting, while the effect on the lower limb joint and trunk flexion angles was limited. Visual feedback on the AP-COP position could be useful for modifying the ankle and knee extensor moments during double-leg squatting.

Protocols of rehabilitation and return to sport, and clinical outcomes after medial patellofemoral ligament reconstruction with and without tibial tuberosity osteotomy: a systematic review.
Yuta Koshino, Shohei Taniguchi, Takumi Kobayashi, Mina Samukawa, Masayuki Inoue
International orthopaedics, 46, 11, 2517, 2528, 2022年06月15日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, PURPOSE: No consensus exists on rehabilitation programmes after medial patellofemoral ligament reconstruction (MPFLR) with or without tibial tuberosity osteotomy (TTO). This systematic review examined the content and timeline of rehabilitation (weightbearing, range of motion [ROM] and exercise therapy) and return to sport (RTS), as well as patient-reported outcomes after MPFLR with or without TTO. METHODS: The PubMed, Cochrane Library, Web of Sciences, CINAHL and SPORTDiscus databases were searched from inception to December 2021. Studies that reported postoperative rehabilitation programmes and patient-reported outcomes for patients aged ≥ 18 years who underwent MPFLR with or without concomitant TTO were included. RESULTS: Eighty-five studies were included, 57 of which were case series and only one randomised controlled trial on rehabilitation programmes. Non-weightbearing was set within one week post-operatively in approximately 80% of weightbearing programmes for MPFLR without and with TTO. Joint immobilisation was set within one week post-operatively in 65.3% and 93.8% of programmes for MPFLR without and with TTO, respectively. Weightbearing and ROM (≤ 90°) restriction were within three weeks post-operatively for > 50% of the programmes. Quadriceps strengthening was the most cited exercise therapy (33 programmes), most often initiated within two weeks post-operatively. However, few other exercise programmes were cited (only nine programmes). RTS was mostly noted at six months post-operatively (35 programmes). The weighted mean Kujala score was 87.4 points. CONCLUSION: Regardless of TTO addition to MPFLR, most studies restricted weightbearing and ROM only in the early post-operative period, with seemingly favourable clinical results. Limited information was available on post-operative exercise therapy.

Evaluation of gait characteristics in subjects with locomotive syndrome using wearable gait sensors.
Yuki Saito, Tomoya Ishida, Yoshiaki Kataoka, Ryo Takeda, Shigeru Tadano, Teppei Suzuki, Kentaro Nakamura, Akimi Nakata, Satoshi Osuka, Satoshi Yamada, Mina Samukawa, Harukazu Tohyama
BMC musculoskeletal disorders, 23, 1, 457, 457, 2022年05月14日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Individuals with locomotive syndrome (LS) require nursing care services owing to problems with locomotion and the musculoskeletal system. Individuals with LS generally have a reduced walking speed compared with those without LS. However, differences in lower-limb kinematics and gait between individuals with and without LS are not fully understood. This study aimed to clarify the characteristics of the gait kinematics of individuals with LS using wearable sensors. METHODS: We assessed 125 participants (mean age 73.0 ± 6.7 years) who used a public health promotion facility. Based on the 25-question Geriatric Locomotive Function Scale (GLFS-25), these participants were grouped into the non-LS (GLFS-25 < 7), LS-stage 1 (GLFS-25 7-16), and LS-stage 2 (GLFS-25 ≥ 16) groups (larger GLFS-25 scores indicate worse locomotive ability). Spatiotemporal parameters and lower-limb kinematics during the 10-m walk test were analyzed by the "H-Gait system", which is a motion analysis system that was developed by the authors and is based on seven inertial sensors. The peak joint angles during the stance and swing phases, as well as the gait speed, cadence, and step length were compared among all groups. RESULTS: There were 69 participants in the non-LS group, 33 in the LS-stage 1 group, and 23 in the LS-stage 2 group. Compared with the non-LS group, the LS-stage 2 group showed significantly smaller peak angles of hip extension (9.5 ± 5.3° vs 4.2 ± 8.2°, P = 0.002), hip flexion (34.2 ± 8.8° vs 28.5 ± 9.5°, P = 0.026), and knee flexion (65.2 ± 18.7° vs 50.6 ± 18.5°, P = 0.005). The LS-stage 1 and LS-stage 2 groups had a significantly slower mean gait speed than the non-LS group (non-LS: 1.3 ± 0.2 m/s, LS-stage 1: 1.2 ± 0.2 m/s, LS-stage 2: 1.1 ± 0.2 m/s, P < 0.001). CONCLUSIONS: The LS-stage 2 group showed significantly different lower-limb kinematics compared with the non-LS group, including smaller peak angles of hip extension, hip flexion, and knee flexion. It would be useful to assess and improve these small peak joint angles during gait for individuals classified as LS-stage 2.

Warm-Up Intensity and Time-Course Effects on Jump Height under Cold Conditions.
Itaru Chiba, Mina Samukawa, Kazuki Takizawa, Yuriko Nishikawa, Tomoya Ishida, Satoshi Kasahara, Masanori Yamanaka, Harukazu Tohyama
International journal of environmental research and public health, 19, 9, 2022年05月09日, ［査読有り］, ［責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, With this study, we aimed to investigate the effects of different warm-up intensities on counter-movement jump (CMJ) performance over time under cold conditions. Eleven male collegiate athletes volunteered. The participants performed high-intensity warm-up (HWU) at 80% VO2max and moderate-intensity warm-up (MWU) at 60% VO2max for 15 min on a bicycle ergometer in a laboratory room at 10 °C. CMJ height, vastus lateralis muscle temperature, heart rate, and perceived fatigue were measured before warm-up (Pre), immediately after (Post 0), 10 min after (Post 10), and 20 min after (Post 20). Significant main effects and interactions were found for CMJ height (time, p < 0.001 and ηp2 = 0.859; interaction, p = 0.007 and ηp2 = 0.327). HWU significantly increased CMJ height at Post 0 to Post 20 compared to that at Pre (p < 0.01), whereas MWU increased CMJ height at Post 0 only compared to that at Pre (p < 0.001). The results indicate that HWU achieved an increase in CMJ height for 20 min. MWU changed CMJ height instantly, but the change did not last compared to HWU in a cold environment.

The Influence of Low Energy Availability on Bone Mineral Density and Trabecular Bone Microarchitecture of Pubescent Female Athletes: A Preliminary Study.
Nodoka Ikegami, Mina Samukawa, Mikako Sakamaki-Sunaga, Makoto Sugawara, Shizuka Torashima, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama
International journal of environmental research and public health, 19, 9, 2022年05月04日, ［査読有り］, ［責任著者］, ［国際誌］
英語, 研究論文（学術雑誌）, The influence of low energy availability (LEA) on bone mineral density (BMD) and trabecular bone microarchitecture in pubescent female athletes is unclear. This study aimed to investigate the influence of LEA on BMD and trabecular bone microarchitecture in 21 pubescent female athletes (age, 12-15 years; 11 track and field athletes, 10 gymnasts). We used two indices to assess LEA: energy availability and the percent of ideal body weight. Dual-energy X-ray absorptiometry was used to obtain total body less head, lumbar spine BMD Z-scores, and lumbar trabecular bone scores (TBS). Pearson's or Spearman's correlation coefficients were used to assess the relationship among EA, percent of ideal body weight, and bone parameters. The threshold for statistical significance was set at p < 0.05. The percent of ideal body weight was significantly correlated with the BMD Z-scores of the total body less head (r = 0.61; p < 0.01), lumbar spine (r = 0.55; p < 0.01), and lumbar TBS (r = 0.47; p = 0.03). However, energy availability was not correlated with bone parameters. These findings suggest that screening for low ideal body weight may be a useful predictor of low BMD and insufficient trabecular bone microarchitecture in pubescent female athletes.

Sex difference in frontal plane hip moment in response to lateral trunk obliquity during single-leg landing.
Shohei Taniguchi, Tomoya Ishida, Masanori Yamanaka, Ryo Ueno, Ryohei Ikuta, Masato Chijimatsu, Mina Samukawa, Yuta Koshino, Satoshi Kasahara, Harukazu Tohyama
BMC sports science, medicine & rehabilitation, 14, 1, 70, 70, 2022年04月15日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Lateral trunk obliquity during landing is a characteristic of anterior cruciate ligament (ACL) injuries in female athletes and affects their knee and hip kinetics and kinematics. However, it is unclear whether these effects differ between females and males. The purpose of this study was to compare the effects of lateral trunk obliquity on knee and hip kinetics and kinematics in females and males during single-leg landing. METHODS: Eighteen female (aged 22.1 ± 1.5 years) and 18 male participants (aged 21.8 ± 1.1 years) performed single-leg landings under two conditions: (1) without any instructions about trunk position (natural) and (2) with leaning their trunks laterally 15° from the vertical line (trunk obliquity). The kinetics and kinematics of their hip and knee were analyzed using a three-dimensional motion analysis with a force plate. Two-way repeated-measures ANOVA (sex × trunk obliquity) and Bonferroni pairwise comparisons were conducted. RESULTS: The trunk obliquity angle at initial contact was significantly greater in the trunk-obliquity landing condition than in the natural landing condition (natural 4.0 ± 2.2°, trunk-obliquity 15.1 ± 3.6°, P < 0.001) with no sex difference (95% CI - 1.2 to 2.2°, P = 0.555). The peak knee abduction moment was significantly larger in the trunk-obliquity landing condition than in the natural landing condition (trunk-obliquity, 0.09 ± 0.07 Nm/kg/m; natural, 0.04 ± 0.06 Nm/kg/m; P < 0.001), though there was no sex or interaction effect. A significant interaction between sex and landing condition was found for the peak hip abduction moment (P = 0.021). Males showed a significantly larger peak hip abduction moment in the trunk-obliquity landing condition than in the natural landing condition (95% CI 0.05 to 0.13 Nm/kg/m, P < 0.001), while females showed no difference in the peak hip abduction moment between the two landing conditions (95% CI - 0.02 to 0.06 Nm/kg/m, P = 0.355). CONCLUSIONS: The knee abduction moment increased with a laterally inclined trunk for both female and male participants, while the hip abduction moment increased in males but not in females. It may be beneficial for females to focus on frontal plane hip joint control under lateral trunk-obliquity conditions during single-leg landing.

Sports injury prevention programmes from the sports physical therapist's perspective: An international expert Delphi approach.
Luciana De Michelis Mendonça, Joke Schuermans, Sander Denolf, Christopher Napier, Natália F N Bittencourt, Andrés Romanuk, Igor Tak, Kristian Thorborg, Mario Bizzini, Carlo Ramponi, Colin Paterson, Martin Hägglund, Laurent Malisoux, Wesam Saleh A Al Attar, Mina Samukawa, Ernest Esteve, Ummkulthoum Bakare, Maria Constantinou, Anthony Schneiders, Alexandre Cavallieri Gomes, Didier Florentz, Derya Ozer Kaya, Syahmirza Indra Lesmana, Joar Harøy, Vesa Kuparinen, Nicola Philips, Walter Jenkins, Evi Wezenbeek, Erik Witvrouw
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 55, 146, 154, 2022年04月07日, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVE: To provide consensus on how to plan, organize and implement exercise-based injury prevention program (IPP) in sports. DESIGN: Delphi. SETTING: LimeSurvey platform. PARTICIPANTS: Experienced sports physical therapists from the International Federation of Sports Physical Therapy member countries. MAIN OUTCOME MEASURES: Factors related to sports IPP planning, organization and implementation. RESULTS: We included 305 participants from 32 countries. IPP planning should be based on an athlete's injury history, on pre-season screening results, and on injury rates (respectively, 98%, 92%, 89% agreement). In total 97% participants agreed that IPP organization should depend on the athlete's age, 93% on the competition level, and 93% on the availability of low-cost materials. It was agreed that IPP should mainly be implemented in warm-up sessions delivered by the head or strength/conditioning coach, with physical training sessions and individual physical therapy sessions (respectively, 94%, 92%, 90% agreement). CONCLUSION: Strong consensus was reached on (1) IPP based on the athlete's injury history, pre-season screening and evidence-based sports-specific injury rates; (2) IPP organization based on the athlete's age, competition level, and the availability of low-cost materials and (3) IPP implementation focussing on warm-up sessions implemented by the strength/conditioning coach, and/or individual prevention sessions by the physical therapist.

Energy dissipation during single-leg landing from three heights in individuals with and without chronic ankle instability.
Kentaro Watanabe, Yuta Koshino, Tomoya Ishida, Mina Samukawa, Harukazu Tohyama
Sports biomechanics, 21, 4, 408, 427, 2022年04月, ［国際誌］
英語, 研究論文（学術雑誌）, Inadequate energy dissipation during landing may increase the risk of ankle sprain. Mechanical demands (landing height) in landing tasks may affect the biomechanical differences between individuals with and without chronic ankle instability (CAI). However, energy dissipation strategies during landing from various heights in individuals with CAI are unclear. The purpose of this study was to compare the effect of landing height on lower extremity biomechanics between individuals with and without CAI. Eleven participants in each of the CAI and Control group performed a single-leg landing from three heights (30, 40, and 50 cm). We calculated the contribution of each joint to total energy dissipation at 50-ms intervals during 0-200 ms post-initial contact (IC). Peak joint angles and moments and joint stiffnesses were calculated during 0-200 ms post-IC. Two-way mixed analysis of variance revealed significant group-by-height interactions for hip energy dissipation at 101-150 ms post-IC and peak ankle plantarflexion and hip extension moment. These significant interactions suggested that the effects of landing height on the ankle and hip joints differ between individuals with and without CAI. The effect of mechanical demands on altered landing biomechanics among CAI populations should be considered in biomechanical studies and clinical practice.

Torque-angle curve of the knee flexors in athletes with a prior history of hamstring strain.
Kentaro Mikami, Mina Samukawa, Kensuke Oba, Kentaro Nakamura, Yuki Suzumori, Yuko Ishida, Hisashi Matsumoto, Yoshimitsu Aoki, Tomoya Ishida, Masanori Yamanaka, Harukazu Tohyama
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 54, 29, 35, 2022年03月, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVES: To investigate the knee flexor torque-angle curve after hamstring strain injury using different muscle action types and angular velocities. DESIGN: Cross-sectional. SETTING: Controlled laboratory. PARTICIPANTS: Thirteen collegiate athletes injured hamstring strain (21.0 ± 0.8 years; 173.9 ± 6.5 cm; 70.1 ± 10.5 kg). MAIN OUTCOME MEASURES: Concentric and eccentric knee flexor torque was measured at 60 & 300°/sec. Peak torque and average torque every 10° were determined from torque-angle curve and injured side was compared with non-injured side. RESULTS: No significant differences were found in the concentric muscle actions. However, the eccentric peak torque was significantly lower on the injured side at 60°/sec (p = 0.048) and at 300°/sec (p = 0.002). The average eccentric torque was significantly lower on the injured side at 60°/sec from 10° to 20° of knee flexion (p = 0.012-0.018) and at 300°/sec from 10° to 60° of knee flexion (p = 0.005-0.049). CONCLUSION: The knee flexor torque-angle curve changes with eccentric muscle action after hamstring injury. Eccentric torque declines were close to full knee extension at 60°/sec and a wide range of knee flexion at 300°/sec. The assessment and rehabilitation of eccentric hamstring strength may be important to consider the effect of the angular velocity after hamstring strain injury.

Feasibility of an Ultrasound-Based Method for Measuring Talar Displacement during the Anterior Drawer Stress Test Using a Telos Device: A Preliminary Study.
Kaori Tsutsumi, Utayo Nakaya, Yuta Koshino, Mari Tateno, Kazuhisa Matsumoto, Mai Tanaka, Mika Yokoyama, Tatsunori Horie, Mina Samukawa, Tamotsu Kamishima, Harukazu Tohyama
International journal of environmental research and public health, 19, 4, 2022年02月18日, ［国際誌］
英語, 研究論文（学術雑誌）, This study was conducted to measured talar displacement using ultrasound during an anterior drawer test (ADT) with a Telos device. Five adults (3 men and 2 women; 8 ankles; mean age: 23.2 y) with a history of ankle sprain and eight adults (5 men and 3 women; 16 ankles; mean age: 22.1 y) without a history of ankle sprain were recruited into a history of ankle sprain (HAS) and a control group, respectively. Talar displacement was observed in response to load forces applied by a Telos device during the ultrasound stress imaging test. The ultrasound probe was placed 5 mm inside from the center of the Achilles tendon on the posterior ankle along the direction of the major axis. The inter-rater reliability for the present method was classified as good and excellent (ICC(2,2) = 0.858 and 0.957 at 120 N and 150 N, respectively) in the control group and excellent (ICC(2,2) = 0.940 and 0.905 at 120 N and 150 N, respectively) in the HAS group, according to specific intraclass correlation coefficient values. We found that talar displacement during the ADT was lower in the HAS group than in the control group. Analysis of the receiver operating characteristic curve revealed that the quantitative ultrasound-based ADT using a Telos device was superior to the X-ray-based test in detecting reduced ankle joint mobility during the ADT (area under the curve of 0.905 and 0.726 at a force of 150 N using ultrasound-based and X-ray-based tests, respectively). Further investigation is needed; nevertheless, this preliminary study suggests that the ultrasound-based quantitative ADT using a Telos device might detect talar displacement more sensitively than the conventional stress X-ray.

The deficits of isometric knee flexor strength in lengthened hamstring position after hamstring strain injury.
Ginji Nara, Mina Samukawa, Kensuke Oba, Yuta Koshino, Tomoya Ishida, Satoshi Kasahara, Harukazu Tohyama
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 53, 91, 96, 2022年01月, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVE: To investigate the effects of knee flexion angle on peak torque, rate of torque development (RTD) during isometric contraction and hamstring flexibility after hamstring strain injury (HSI). DESIGN: Cross-sectional. SETTING: Controlled laboratory research. PARTICIPANTS: Fourteen male athletes with a history of HSI and 14 athletes without HSI (controls). MAIN OUTCOME MEASURES: Hamstring flexibility was evaluated using active knee extension test. Isometric knee flexion peak torque and RTD were determined at 30°, 60°, and 90° of knee flexion measured by an isokinetic dynamometer. RESULTS: Individuals with a history of HSI had statistically significant, moderate deficits in isometric peak torque at 30° of knee flexion (P = 0.037; effect size = 0.55) in the HSI limb than in the uninjured limb, but not at 60° and 90° of knee flexion. In the control group, no significant differences in isometric peak torque at any angle were found between limbs. No differences in peak RTD and flexibility were found between limbs in both groups. CONCLUSIONS: Isometric peak torque at 30° of knee flexion was lower in the injured limb than in the uninjured limb. Isometric strength deficits after HSI tended to be affected by lengthened hamstring angles.

Effects of Intermittent and Continuous Static Stretching on Range of Motion and Musculotendinous Viscoelastic Properties Based on a Duration-Matched Protocol.
Kensuke Oba, Mina Samukawa, Yosuke Abe, Yukino Suzuki, Miho Komatsuzaki, Satoshi Kasahara, Tomoya Ishida, Harukazu Tohyama
International journal of environmental research and public health, 18, 20, 2021年10月11日, ［国際誌］
英語, 研究論文（学術雑誌）, The different effects of intermittent and continuous stretching on the mechanical properties of the musculotendinous complex have been unclear. This study aimed to compare the effects of intermittent and continuous stretching for the same duration on the range of motion (ROM), passive resistive torque (PRT), and musculotendinous stiffness (MTS) of ankle plantar flexors. Eighteen healthy young men participated in the study. Intermittent (four sets × 30 s) and continuous stretching (one set × 120 s) were performed in random orders on two separate days. Both stretching protocols were conducted using a dynamometer with a constant torque applied. ROM and PRT were determined using a dynamometer, and MTS was calculated using the torque-angle relationship measured before and after stretching. Two-way repeated measures analysis of variance was performed for all parameters. Both intermittent and continuous stretching significantly increased ROM and decreased PRT and MTS (p < 0.05). Intermittent stretching led to greater changes in ROM and PRT than continuous stretching. However, the reduction in MTS did not differ between the two conditions. These results suggest that intermittent stretching is more effective in increasing ROM and changing the mechanical properties of the musculotendinous complex.

Effects of a physiotherapist-led approach based on a biopsychosocial model for spinal disorders: protocol for a systematic review.
Takahiro Miki, Yu Kondo, Hiroshi Kurakata, Tsuneo Takebayashi, Mina Samukawa
BMJ open, 11, 9, e055144, 2021年09月28日, ［国際誌］
英語, 研究論文（学術雑誌）, INTRODUCTION: Low back pain and neck pain are among the most common musculoskeletal disorders, and their related medical costs are rising every year. Many interventions are based on the biopsychosocial (BPS) model since the cause of pain is more multifaceted. Physiotherapists have increased opportunities to perform multidisciplinary interventions alone in clinical practice due to a lack of understanding of the model and its cost. Therefore, physiotherapist-led interventions using the BPS model are important and require an updated report summarising their effectiveness. Thus, the purpose of this study will be to summarise and synthesise the effects of physiotherapist-led interventions using the BPS model for spinal disorders. METHODS AND ANALYSIS: We will search the Web of Science, CENTRAL, MEDLINE, PsycINFO, CINAHL and PEDro electronic databases, using a date range from inception to September 2021. We will include only randomised controlled trials for patients diagnosed with spinal disorders who received physiotherapist-led interventions based on the BPS model. The search will be limited to English-language publications. Pain intensity and disability are the primary outcomes. Secondary outcomes are any psychological factors. We will examine the short-term, medium-term and long-term effects, and a subgroup analysis will be conducted, if possible, to investigate the role of additional physiotherapist training. ETHICS AND DISSEMINATION: This study is exempt from ethical approval because it involves publicly available documents. The findings will be submitted for publication in a relevant peer-reviewed journal. PROSPERO REGISTRATION NUMBER: CRD42021258071.

Factors associating with disability of non-specific low back pain in different subgroups: A hierarchical linear regression analysis.
Takahiro Miki, Daisuke Higuchi, Tsuneo Takebayashi, Mina Samukawa
Scientific reports, 11, 1, 18278, 18278, 2021年09月14日, ［国際誌］
英語, 研究論文（学術雑誌）, This study aimed to explore factors associating with disability, which means physical impairment affecting a person's mobility, capacity, stamina, or agility, of non-specific low back pain (NSLBP) of the acute and non-acute groups. Two hundred thirty-five patients with NSLBP of less than 8 weeks' duration as acute groups (n = 124) and more than 8 weeks' duration as non-acute group (n = 111) were recruited. It was collected data on pain intensity, disability and psychosocial factors, including pain catastrophising, fear of movement and pain self-efficacy. Disability was measured Roland Morris Disability Questionnaire. A hierarchical multiple regression analysis was performed to analyse factors associating with disability of the acute and non-acute groups. The Result was that explanatory power increased with each additional variable of the order of demographic characteristics, pain intensity and psychosocial factors for both groups. Pain intensity, pain catastrophising and pain self-efficacy had significant explanatory power, with pain self-efficacy having the most significant association on the acute group. Only pain self-efficacy having the most significant association on disability of the non-acute group. In conclusion, the factors associating with disability differed depending on the duration of the disease, and pain self-efficacy might be one of the factors associating with disability of patients with NSLBP.

Improvements in asymmetry in knee flexion motion during landing are associated with the postoperative period and quadriceps strength after anterior cruciate ligament reconstruction.
Tomoya Ishida, Mina Samukawa, Makoto Suzuki, Hisashi Matsumoto, Yu Ito, Miku Sakashita, Yoshimitsu Aoki, Masanori Yamanaka, Harukazu Tohyama
Research in sports medicine (Print), 1, 11, 2021年08月18日, ［国際誌］
英語, 研究論文（学術雑誌）, This study investigated the relationship between quadriceps strength and knee kinematics during a drop vertical jump (DVJ) at 6, 9 and 12 months after anterior cruciate ligament reconstruction (ACLR) in 9 male and 22 female athletes (16.6 ± 2.1 years old). Isokinetic quadriceps strength was measured by a dynamometer (Biodex System 3). Knee flexion excursion was assessed using two-dimensional analysis. Knee flexion excursion at 6 months was significantly smaller in the involved limb than in the uninvolved limb independent of quadriceps strength (56.7° ± 9.3°, 63.4° ± 11.4°, P < 0.001). At 9 months, only the low quadriceps strength group demonstrated a similar interlimb difference (57.2°± 12.3°, 63.3° ± 10.5°, P < 0.001). At 12 months, there was no significant interlimb difference in knee flexion excursion regardless of quadriceps strength. These findings indicate that restoration in symmetrical knee flexion excursion during a DVJ requires rehabilitation as well as quadriceps strength.

Changes in postural control strategy during quiet standing in individuals with knee osteoarthritis.
Kento Sabashi, Satoshi Kasahara, Harukazu Tohyama, Takeshi Chiba, Yuta Koshino, Tomoya Ishida, Mina Samukawa, Masanori Yamanaka
Journal of back and musculoskeletal rehabilitation, 2021年08月02日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Knee osteoarthritis (OA) impairs postural control and may affect how the lower limb joints are used for postural control. OBJECTIVE: To investigate how individuals with knee OA use lower limb joints for static postural control. METHODS: Ten patients with knee OA and thirteen healthy controls performed quiet standing for 30 s. The standard deviation of the center of mass (COM) and lower limb joint motions in the anterior-posterior (AP) and medial-lateral (ML) planes were calculated from three-dimensional marker trajectories. Pearson's correlation analysis and independent t-tests were conducted to investigate the relationship between COM and lower limb joint motion and to compare group difference, respectively. RESULTS: The AP hip angular velocity alone in the knee OA group and the AP hip and knee angular velocity in the control group were significantly correlated with the AP COM velocity. The ML hip angular velocity was significantly correlated with the ML COM velocity in both groups. The knee OA group exhibited a significantly larger standard deviation of AP COM velocity than the control group. CONCLUSIONS: Individuals with knee OA depended solely on the contribution of the hip to the AP COM velocity, which could not be successfully controlled by the knee.

立位時の足部形態が走行時の足部キネマティクスに与える影響 接地パターンによる差異の検討
奥貫 拓実, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一
日本臨床スポーツ医学会誌, 29, 3, 392, 399, (一社)日本臨床スポーツ医学会, 2021年08月
日本語

足底に対するキネシオロジーテーピングが高齢者の立位バランス機能に与える影響
寒川 美奈, 井野 拓実, 越野 裕太, 木田 貴英, 遠山 晴一, 鈴木 哲平, 小笠原 克彦
日本未病学会雑誌, 27, 2, 29, 33, (一社)日本未病学会, 2021年08月
日本語

The Effects of Static Stretching On Dynamic Postural Control During Maximum Forward Leaning Task.
Kensuke Oba, Moeka Ohta, Hiroki Mani, Teppei Suzuki, Katsuhiko Ogasawara, Mina Samukawa
Journal of motor behavior, 1, 9, 2021年06月21日, ［国際誌］
英語, 研究論文（学術雑誌）, The purpose of this study was to determine how the application of static stretching to ankle plantar flexors affects postural control during maximum forward leaning. Twenty-six volunteer males (age 21.4 ± 1.2 years) were randomly assigned to stretching and control conditions. Participants conducted 5-min stretching on a stretch board for the stretching condition and were kept standing for 6-min for the control condition. Before and after intervention, the range of motion (ROM) at ankle dorsiflexion and the center of pressure (COP) excursion during maximal forward leaning were determined. Mean anteroposterior COP position, COP velocity and COP areas were calculated to compare the change in postural control. After stretching, ROM was significantly increased. During maximal forward leaning after stretching, both COP position and velocity showed significant increases compared to before stretching. Moreover, COP position and velocity in the stretching condition were significantly higher than in the control condition after stretching. No significant differences were found in COP area before and after stretching. Five-minute stretching increased not only ROM but also the anterior limit of stability while maintaining posture and led to faster COP shift than before stretching. These results indicate that static stretching would improve dynamic postural control as well.

【腰痛に対する理学療法の進歩】生物心理社会モデルに基づく非特異的腰痛に対する理学療法の進化
三木 貴弘, 高崎 博司, 寒川 美奈, 竹林 庸雄
Journal of Spine Research, 12, 6, 825, 830, (一社)日本脊椎脊髄病学会, 2021年06月
日本語

高校野球選手における投球障害予防への認識調査
奈良 昌哉, 鈴森 雄貴, 大場 健裕, 寒川 美奈
理学療法科学, 36, 3, 409, 413, (一社)理学療法科学学会, 2021年06月
日本語

Analysis of 3-D Kinematics Using H-Gait System during Walking on a Lower Body Positive Pressure Treadmill.
Yoshiaki Kataoka, Ryo Takeda, Shigeru Tadano, Tomoya Ishida, Yuki Saito, Satoshi Osuka, Mina Samukawa, Harukazu Tohyama
Sensors (Basel, Switzerland), 21, 8, 2021年04月08日, ［国際誌］
英語, 研究論文（学術雑誌）, Recently, treadmills equipped with a lower-body positive-pressure (LBPP) device have been developed to provide precise body weight support (BWS) during walking. Since lower limbs are covered in a waist-high chamber of an LBPP treadmill, a conventional motion analysis using an optical method is impossible to evaluate gait kinematics on LBPP. We have developed a wearable-sensor-based three-dimensional motion analysis system, H-Gait. The purpose of the present study was to investigate the effects of BWS by a LBPP treadmill on gait kinematics using an H-Gait system. Twenty-five healthy subjects walked at 2.5 km/h on a LBPP treadmill under the following three conditions: (1) 0%BWS, (2) 25%BWS and (3) 50%BWS conditions. Acceleration and angular velocity from seven wearable sensors were used to analyze lower limb kinematics during walking. BWS significantly decreased peak angles of hip adduction, knee adduction and ankle dorsiflexion. In particular, the peak knee adduction angle at the 50%BWS significantly decreased compared to at the 25%BWS (p = 0.012) or 0%BWS (p < 0.001). The present study showed that H-Gait system can detect the changes in gait kinematics in response to BWS by a LBPP treadmill and provided a useful clinical application of the H-Gait system to walking exercises.

Larger hip external rotation motion is associated with larger knee abduction and internal rotation motions during a drop vertical jump.
Tomoya Ishida, Yuta Koshino, Masanori Yamanaka, Ryo Ueno, Shohei Taniguchi, Takumi Ino, Satoshi Kasahara, Mina Samukawa, Harukazu Tohyama
Sports biomechanics, 1, 15, 2021年03月04日, ［国際誌］
英語, 研究論文（学術雑誌）, Associations among hip motions, knee abduction and internal rotation motion during a drop vertical jump (DVJ), which increases the risk of anterior cruciate ligament injury, remain unclear. The purpose of this study was to examine associations among knee abduction, internal rotation and hip joint motions during a DVJ. Fifty-seven young female participants performed a DVJ from a 30-cm height. Hip and knee kinematics and kinetics were analysed using a three-dimensional motion analysis system and force plates. Multiple regression analysis showed that peak knee abduction angle was negatively associated with knee internal rotation and hip internal rotation excursions from initial contact (IC) to peak knee flexion, and positively associated with peak knee abduction moment (R2 = 0.465, P< 0.001). Peak knee internal rotation angle was negatively associated with the hip flexion excursion from IC to peak knee flexion and peak hip adduction moment (R2 = 0.194, P= 0.001). In addition, hip internal rotation excursion was negatively associated with knee abduction and internal rotation excursion from IC to 50 ms after IC. To avoid a large knee abduction and internal rotation motion during jump-landing training, it might be beneficial to provide landing instructions to avoid a large hip external rotation motion.

Influence of Constant Torque Stretching at Different Stretching Intensities on Flexibility and Mechanical Properties of Plantar Flexors.
Kensuke Oba, Mina Samukawa, Kentaro Nakamura, Kentaro Mikami, Yuki Suzumori, Yuko Ishida, Nathalie Keeler, Hiroshi Saitoh, Masanori Yamanaka, Harukazu Tohyama
Journal of strength and conditioning research, 35, 3, 709, 714, 2021年03月01日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, ABSTRACT: Oba, K, Samukawa, M, Nakamura, K, Mikami, K, Suzumori, Y, Ishida, Y, Keeler, N, Saitoh, H, Yamanaka, M, and Tohyama, H. Influence of constant torque stretching at different stretching intensities on flexibility and mechanical properties of plantar flexors. J Strength Cond Res 35(3): 709-714, 2021-The purpose of this study was to examine the effects of constant torque stretching (CTS) at different stretching intensities on the maximal range of motion (ROM) and muscle-tendon unit (MTU) stiffness of plantar flexors. Fourteen healthy men performed 4 trials of differing stretch intensities: no stretching (control), 50, 75, and 100%. Stretch intensity was defined as maximum passive resistive torque predetermined at a familiarization trial. Each stretch trial consisted of 5 sets of 60-second CTS at the designated stretch intensity. Both maximal ROM and passive resistive torque were assessed during passive dorsiflexion, and MTU stiffness was calculated using the torque-angle curves measured before and after CTS. There were no significant differences in maximal ROM or MTU stiffness at the baseline condition. After the intervention, significantly greater maximal ROM and significantly lower MTU stiffness were observed in the 100% CTS condition than the control condition, whereas there were no significant differences between the submaximal intensity condition (i.e., 50 or 75% intensity) and the control condition. Therefore, our findings suggest that maximal intensity stretching is the most effective approach for improving both flexibility and MTU stiffness with CTS.

Effects of unweighting on gait kinematics during walking on a lower-body positive-pressure treadmill in patients with hip osteoarthritis.
Yoshiaki Kataoka, Tomohiro Shimizu, Ryo Takeda, Shigeru Tadano, Yuki Saito, Satoshi Osuka, Tomoya Ishida, Mina Samukawa, Tohru Irie, Daisuke Takahashi, Norimasa Iwasaki, Harukazu Tohyama
BMC musculoskeletal disorders, 22, 1, 46, 46, Research Square, 2021年01月08日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activities. Treadmills that support the body weight (BW) reduce the load on the lower limbs, and those equipped with a lower-body positive-pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device. METHODS: A total of 15 women with hip OA and 15 age-matched female controls wore a three-dimensional (3-D) motion analysis system and walked at a self-selected speed on the LBPP treadmill. Data regarding self-reported hip pain using a numeric rating scale (NRS) in which the scores 0 and 10 represented no pain and the worst pain, respectively, under three different BW conditions (100, 75, and 50%) were collected. Moreover, 3-D peak joint angles during gait under each condition were calculated and compared. RESULTS: In the hip OA group, the NRS pain scores at 50 and 75% BW conditions significantly decreased compared with that at 100% BW condition (50%, P = 0.002; 75%, P = 0.026), and the peak hip extension angle decreased compared with that in the healthy controls (P = 0.044). In both groups, unweighting significantly decreased the peak hip (P < 0.001) and knee (P < 0.001) flexion angles and increased the peak ankle plantar flexion angle (P < 0.001) during walking. CONCLUSIONS: Unweighting by the LBPP treadmill decreased pain in the hip OA group but did not drastically alter the gait kinematics compared with that in the control group. Therefore, regarding the use of the LBPP treadmill for patients with hip OA, clinicians should consider the benefits of pain reduction rather than the kinematic changes.

Landing Biomechanics During a Single-leg Landing With Lateral Trunk Obliquity in Female Athletes
Taniguchi S, Ishida T, Yamanaka M, Ueno R, Ikuta R, Chijimatsu M, Samukawa M, Koshino Y, Kasahara S, Tohyama H
2021年01月
研究論文（学術雑誌）

Recognition survey of risk factors with throwing injuries among high school baseball players
Masaya Nara, Yuki Suzumori, Kensuke Oba, Mina Samukawa
Rigakuryoho Kagaku, 36, 3, 409, 413, Society of Physical Therapy Science (Rigaku Ryoho Kagakugakkai), 2021年
日本語, 研究論文（学術雑誌）

A preliminary study of an ultrasound-based method for measuring talar displacement during the anterior drawer stress test using a Telos device
Tsutsumi K, Nakaya U, Koshino Y, Tateno M, Matsumoto K, Tanaka M, Yokoyama M, Horie T, Samukawa M, Kamishima T, Tohyama H
2020年12月
研究論文（学術雑誌）

Postural Stability and Muscle Activation Onset during Double- to Single-Leg Stance Transition in Flat-Footed Individuals.
Yuta Koshino, Mina Samukawa, Shuya Chida, Shinpei Okada, Hirono Tanaka, Kentaro Watanabe, Masato Chijimatsu, Masanori Yamanaka, Harukazu Tohyama
Journal of sports science & medicine, 19, 4, 662, 669, 2020年12月, ［国際誌］
英語, 研究論文（学術雑誌）, The effects of foot posture on postural stability and on muscular activation pattern for postural control remain unclear. This study aimed to investigate postural stability and muscular activation onset during the transition task from double- to single-leg stance in individuals with different foot postures. Twenty-seven healthy men (age: 21.5 ± 1.5 years) were divided into 3 groups using the Foot Posture Index: neutral foot (n = 10); flatfoot (n = 8); and high-arched foot (n = 9). Center of pressure (COP) data and muscle activation onset times of the tibialis anterior, peroneus longus, gastrocnemius medialis, and soleus during the transition task with eyes closed were compared among groups using one-way analysis of variance and a post-hoc Tukey honestly significant difference test (p < 0.05) when the data were normally distributed and the Kruskal-Wallis test and a post-hoc Mann-Whitney U-test with Bonferroni correction (p < 0.0167) when the data were not normally distributed. The COP displacements in the mediolateral and anteroposterior directions and the resultant COP displacement during the first 3 s after a stability time point, as determined by sequential estimation during the single-leg stance phase, differed significantly among the three groups (p < 0.05). Post-hoc tests showed that the displacements were significantly greater in the flatfoot group than in the neutral and high-arched foot groups (p < 0.05), and the effect sizes for these results were large. No muscular activation onset times showed significant intergroup differences. Postural stability was significantly decreased only in the flatfoot group, while muscle activation onsets did not differ significantly by foot posture during the transition task. Decreased postural stability may be one mechanism underlying the link between flatfoot and risk of lower limb injury, and foot posture represents a potential confounder for measuring postural stability during the transition task.

Warm-Up Intensity and Time Course Effects on Jump Performance.
Ryo Tsurubami, Kensuke Oba, Mina Samukawa, Kazuki Takizawa, Itaru Chiba, Masanori Yamanaka, Harukazu Tohyama
Journal of sports science & medicine, 19, 4, 714, 720, 2020年12月, ［国際誌］
英語, 研究論文（学術雑誌）, Jump performance is affected by warm-up intensity and body temperature, but the time course effects have not been thoroughly investigated. The purpose of this study was to investigate time course effects on jump performance after warm-up at different intensities. Nine male athletes (age: 20.9 ± 1.0 years; height: 1.75 ± 0.03 m; weight: 66.4 ± 6.3 kg; mean ± SD) volunteered for this study. The participants performed three warm-ups at different intensities: 15 min at 80% VO2 max, 15 min at 60% VO2 max, and no warm-up (control). After each warm-up, counter movement jump (CMJ) height, vastus lateralis temperature, heart rate and subjective fatigue level were measured at three intervals: immediately after warm-up, 10 min after, and 20 min after, respectively. Significant main effects and interactions were found for muscle temperature (intensity: p < 0.01, η2p = 0.909; time: p < 0.01, η2p = 0.898; interaction: p < 0.01, η2p = 0.917). There was a significant increase of muscle temperature from the baseline after warm-up, which lasted for 20 min after warm-up with 80% VO2 max and 60% VO2 max (p < 0.01). Muscle temperature was significantly higher with warm-up at 80% VO2 max than other conditions (P < 0.01). Significant main effects and interactions for CMJ height were found (intensity: p < 0.01, η2p = 0.762; time: p < 0.01, η2p = 0.810; interaction: p < 0.01, η2p = 0.696). Compared with the control conditions, CMJ height after 80% VO2 max and 60% VO2 max warm-ups were significantly higher (p < 0.01 and p < 0.05, respectively). CMJ height at 20 min after warm-up was significantly higher for 80% VO2 max warm-up than for 60% VO2 max warm-up (p < 0.01). However, CMJ height at 10 min after 60% VO2 max warm-up was not significantly different from the baseline (p < 0.05). These results showed that both high and moderate intensity warm-up can maintain an increase in muscle temperature for 20 min. Jump performance after high-intensity warm-up was increased for 20 min compared to a moderate intensity warm-up.

Landing instructions focused on pelvic and trunk lateral tilt decrease the knee abduction moment during a single-leg drop vertical jump.
Masato Chijimatsu, Tomoya Ishida, Masanori Yamanaka, Shohei Taniguchi, Ryo Ueno, Ryohei Ikuta, Mina Samukawa, Takumi Ino, Satoshi Kasahara, Harukazu Tohyama
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 46, 226, 233, 2020年11月, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVES: To investigate the effects of pelvic and trunk lateral tilt-focused landing instructions on the knee abduction moment during the single-leg drop vertical jump task. DESIGN: Descriptive laboratory study. SETTING: Motion analysis laboratory. PARTICIPANTS: Fifteen young, healthy female participants. MAIN OUTCOME MEASURES: The participants performed 15 single-leg drop vertical jumps. Landing instructions with self-video recordings were provided so that the participants' pelvis and trunk remained horizontal in the frontal plane. Pelvic, trunk and knee kinematics and kinetics were evaluated using a three-dimensional motion analysis system before and after the landing instructions. RESULTS: The peak knee abduction moment significantly decreased postinstruction (preinstruction 22.6 ± 15.3 Nm, postinstruction 17.9 ± 15.4 Nm, P = 0.004), as did pelvic and trunk lateral tilt (P < 0.01). The knee abduction and internal rotation angles at initial contact significantly decreased postinstruction (P = 0.037, P = 0.007), with no significant change in the peak knee abduction and internal rotation angles from pre-to postinstruction. CONCLUSIONS: Landing instructions focused on pelvic and trunk lateral tilt are effective in decreasing the knee abduction moment during the single-leg drop vertical jump. Pelvic and trunk lateral tilt should be controlled to decrease the knee abduction moment during single-leg landing.

前方および後方からの降段動作が両側膝関節内側負荷に与える影響
水野 歩, 井野 拓実, 佐橋 健人, 千葉 健, 越野 裕太, 寒川 美奈, 遠山 晴一, 山中 正紀
理学療法ジャーナル, 54, 10, 1225, 1230, (株)医学書院, 2020年10月
日本語

Prevalence and characteristics of chronic ankle instability and copers identified by the criteria for research and clinical practice in collegiate athletes.
Yuta Koshino, Mina Samukawa, Hiromu Murata, Satoshi Osuka, Satoshi Kasahara, Masanori Yamanaka, Harukazu Tohyama
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 45, 23, 29, 2020年09月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVES: To investigate the prevalence and characteristics of chronic ankle instability (CAI) and copers among collegiate athletes as identified by criteria for research (CAI-R and copers-R) and for clinical practice (CAI-C and copers-C). DESIGN: Cross-sectional study. SETTING: University. PARTICIPANTS: Collegiate athletes (n = 507). MAIN OUTCOME MEASURES: Participants were assessed by questionnaires based on the International Ankle Consortium guidelines. The percentages of participants with CAI-R, CAI-C, copers-R and copers-C were calculated, respectively. Demographic and injury data were statistically compared between CAI-R and copers-R groups. RESULTS: The data of 470 participants was retained after exclusions. Of these, the prevalence of CAI-R (10.0%) was only half of that of CAI-C (19.8%), and that of copers-R and copers-C was about 5%. Seventy percent of unclassifiable participants had recurrent ankle sprains. CAI was most common in basketball, while copers were less prevalent in basketball, judo, rugby and gymnastics. The age at the initial injury was significantly younger in the CAI-R participants than in the copers-R. CONCLUSIONS: The type of sport and the age at the initial injury may be associated with developing CAI. The standard criteria may not capture the entire clinical CAI population, therefore, care should be taken when applying the research to clinical practice.

Abdominal draw-in maneuver changes neuromuscular responses to sudden release from trunk loading in patients with non-specific chronic low back pain.
Satoshi Osuka, Tomoya Ishida, Masanori Yamanaka, Takeshi Chiba, Takuya Miura, Yuta Koshino, Yuki Saito, Akimi Nakata, Mina Samukawa, Satoshi Kasahara, Harukazu Tohyama
Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association, 25, 5, 781, 786, 2020年09月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Abdominal draw-in maneuver (ADIM) has been recommended to achieve appropriate trunk muscle response for patients with non-specific chronic low back pain (CLBP). However, it has remained unclear whether the intervention with ADIM could change the trunk muscle response to sudden release from loading, which is considered to contribute mechanical circumstances to low back pain. The purpose of the present study was to investigate the effects of the intervention with ADIM on electromyography (EMG) activities of trunk muscles following sudden release from loading. METHODS: Seventeen subjects with non-specific CLBP participated. Subjects resisted trunk flexion or extension loading in semi-seated position, and then the loading was suddenly released. EMG recordings of 6 trunk muscles were acquired using a wireless surface EMG system. Onset and offset times were calculated from the EMG data. The intervention with ADIM was provided for 4 weeks. The onset and offset times were compared between pre- and post-intervention with ADIM. RESULTS: At the post-intervention, the onset of trunk flexors following release from trunk flexion loading became significantly earlier than pre-intervention (P = 0.028). The offset of flexors following release from trunk extension loading of post-intervention was significantly earlier than that of pre-intervention (P = 0.001). CONCLUSIONS: We showed that the intervention with ADIM changed the EMG activity of trunk flexors in response to sudden release from loading. These results suggest a possibility that ADIM might be effective to improve the neuromuscular control of trunk flexors for the treatment of young patients with non-specific CLBP.

Rehabilitation Effects after Knee Arthroplasty in a core hospital in the local area in China(和訳中)　　　　　　　　　　　　　　　
Jiang Linjing, Kasahara Satoshi, Ishida Tomoya, Shen Liejun, Xu Zhisheng, Jiang Dijin, Wei Yuting, Samukawa Mina, Tohyama Harukazu
Journal of Asian Rehabilitation Science, 3, 3, 40, 46, アジアリハビリテーション科学学会, 2020年08月
英語

腸腰筋ストレッチングが胸腰椎・骨盤アライメントへ与える効果の検証
石田 優子, 寒川 美奈, 大場 健裕, 中村 賢太郎, 片寄 正樹, 山中 正紀, 遠山 晴一
日本臨床スポーツ医学会誌, 28, 3, 501, 505, (一社)日本臨床スポーツ医学会, 2020年08月
日本語

Association between Physical Activity Levels and Body Composition among Healthy Older Japanese Adults during a Snowy Winter: A Cross-Sectional Study.
Tomoko Shimoda, Teppei Suzuki, Kaori Tsutsumi, Mina Samukawa, Sadako Yoshimura, Katsuhiko Ogasawara
International journal of environmental research and public health, 17, 15, 2020年07月23日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Despite a long average lifespan, increased life expectancy does not guarantee higher quality of life. METHODS: To contribute in understanding some determinants of healthy life expectancies in older Japanese individuals in a snowy winter region, we investigated the indicators of health. Local residents (n = 124) in the city of Iwamizawa volunteered for health examinations from January 2016 to March 2016. We recorded activity via daily steps for 2-week periods. In addition, we measured body composition, grip strength, and assessed nutritional status. RESULTS: Analysis of body composition and daily activity indicated that women who walked more than 4000 steps had lower fat mass and increased muscle mass. Men with >3.0 metabolic equivalents (METs) when walking had lower body fat. CONCLUSION: For healthy older Japanese individuals in this snowy winter region, walking >4000 steps daily for women and exercise of >3.0 METs for men may indicate health-promoting activities.

Acute effect of dynamic stretching or running on endurance running performance in well-trained male runners
Taichi YAMAGUCHI, Kazuki TAKIZAWA, Keisuke SHIBATA, Nobuyasu TOMABECHI, Mina SAMUKAWA, Masanori YAMANAKA
Gazz Med Ital - Arch Sci Med, 179, 1-2, 13, 19, 2020年04月, ［査読有り］
英語, 研究論文（学術雑誌）

Effect of General Warm-Up Plus Dynamic Stretching on Endurance Running Performance in Well-Trained Male Runners.
Taichi Yamaguchi, Kazuki Takizawa, Keisuke Shibata, Nobuyasu Tomabechi, Mina Samukawa, Masanori Yamanaka
Research quarterly for exercise and sport, 90, 4, 527, 533, 2019年12月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, Purpose: The purpose of this study was to compare the acute effects of general warm-up (GWU) and GWU plus dynamic stretching (GWU + DS) on endurance running performance in well-trained male runners. Method: The endurance running performances of eight well-trained long-distance male runners were assessed on a treadmill after 2 types of intervention for 5 min after running on the treadmill at a velocity equivalent to 70% maximal oxygen uptake (V̇O2max) in each athlete for 15 min. The interventions were GWU and GWU + DS. In the GWU + DS intervention, dynamic stretching was performed for ten repetitions as quickly as possible for the five muscle groups of the lower extremities. The total duration of the dynamic stretching was 3 min and 45 s. Endurance running performance was assessed at 1 min 15 s after the dynamic stretching. The endurance running performance was evaluated by the time to exhaustion (TTE) during running at a velocity equivalent to 90% [Formula: see text]O2max in each athlete. Results: The TTE (640.6 ± 220.4 s) after GWU + DS intervention was significantly (d = 1.02, p = .03) shorter than that (760.6 ± 249.1 s) after GWU intervention. Conclusions: The results demonstrated that GWU + DS intervention impaired immediate endurance performance of running at a velocity equivalent to 90% [Formula: see text]O2max in well-trained male runners compared with GWU intervention. Thus, we are not able to recommend that well-trained runners and their coaches use the protocol for GWU + DS described in this study during actual warm-ups.

The onset of deep abdominal muscles activity during tasks with different trunk rotational torques in subjects with non-specific chronic low back pain.
Satoshi Osuka, Yuta Koshino, Masanori Yamanaka, Takuya Miura, Yuki Saito, Ryo Ueno, Tomoya Ishida, Mina Samukawa, Harukazu Tohyama
Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association, 24, 5, 770, 775, 2019年09月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, BACKGROUND: Although delayed onset of the deep abdominal muscles activity in subjects with non-specific chronic low back pain (CLBP) has been suggested to be related to trunk rotational torque, no study has examined the onsets associated with non-specific CLBP during a variety of tasks with different trunk rotational torque. The aim of this study is to compare the onsets of deep abdominal muscles activity among tasks with different trunk rotational torques in subjects with and without non-specific CLBP. METHODS: Twelve subjects with non-specific CLBP and 13 control subjects were included. They performed 8 types of upper limb movements. The onsets of muscular activity of bilateral internal oblique-transversus abdominis (IO-TrA) and trunk rotational torque due to the upper limb movements were measured using a surface electromyography and a three-dimensional motion analysis system. RESULTS: In non-specific CLBP group, right IO-TrA activities were significantly delayed during tasks with left trunk rotational torque compared with the control (P < 0.05), while onsets of the left IO-TrA activities were significantly later than those of the control during tasks with right rotational torque of the trunk (P < 0.05). There were no significant differences in onsets of both sides IO-TrA during tasks without trunk rotational torque between non-specific CLBP and control groups (P > 0.05). CONCLUSIONS: The onsets of IO-TrA activities in subjects with non-specific CLBP were delayed during tasks with rotational torque of the trunk in the opposite direction, suggesting a possibility that delayed onset of the deep abdominal muscles during rotational torque of the trunk might be etiology of chronic low back pain.

Forefoot and hindfoot kinematics in subjects with medial tibial stress syndrome during walking and running.
Takumi Okunuki, Yuta Koshino, Masanori Yamanaka, Kaori Tsutsumi, Masato Igarashi, Mina Samukawa, Hiroshi Saitoh, Harukazu Tohyama
Journal of orthopaedic research : official publication of the Orthopaedic Research Society, 37, 4, 927, 932, 2019年04月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, Excessive foot pronation during static standing, walking and running has been reported as a contributing factor for the development of medial tibial stress syndrome (MTSS). The motion of foot pronation consists of hindfoot and forefoot motion. However, no previous studies have investigated forefoot and hindfoot kinematics during walking and running in subjects with MTSS. The current study sought to compare hindfoot and forefoot kinematics between subjects with and without MTSS while walking and running. Eleven subjects with MTSS and 11 healthy controls (each group containing 10 males and one female) participated in the current study. Segment angles of the hindfoot and forefoot during walking and running barefoot on a treadmill were recorded using three-dimensional kinematic analysis. An independent t-test was used to compare kinematic data between groups. Subjects with MTSS exhibited significantly greater hindfoot eversion and abduction (p < 0.05) during walking and running than subjects without MTSS, significantly greater forefoot eversion and abduction (p < 0.05) during walking, and significantly greater forefoot abduction during running (p < 0.05). Hindfoot and forefoot kinematics during walking and running were significantly different between subjects with and without MTSS. For prevention and rehabilitation of MTSS, it may be important to focus on not only hindfoot but also forefoot kinematics during both running and walking. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

The effects of a subsequent jump on the knee abduction angle during the early landing phase.
Tomoya Ishida, Yuta Koshino, Masanori Yamanaka, Ryo Ueno, Shohei Taniguchi, Mina Samukawa, Hiroshi Saito, Hisashi Matsumoto, Yoshimitsu Aoki, Harukazu Tohyama
BMC musculoskeletal disorders, 19, 1, 379, 379, 2018年10月20日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: A double-leg landing with or without a subsequent jump is commonly used to evaluate the neuromuscular control of knee abduction. However, the differences in frontal plane knee biomechanics between landings with and without a subsequent jump are not well known. The purpose of the present study was to investigate the effects of a subsequent jump on knee abduction, including during the early landing phase, in female and male subjects. METHODS: Twenty-one female subjects and 21 male subjects participated. All subjects performed drop landing task (a landing without a subsequent jump) and drop vertical jump task (a landing with a subsequent jump). The subjects landed from a 30-cm height. In drop vertical jump, the subjects also performed a maximum vertical jump immediately after landing. The knee abduction angle and moment were analyzed using a 3D motion analysis system. A two-way analysis of variance (task × time) was performed to examine the effects of a subsequent jump on the knee abduction angle during the early landing phase in female and male subjects. Another two-way analysis of variance (task × sex) was performed to compare peak knee abduction angles and moments. RESULTS: In female subjects, the knee abduction angle was significantly greater during drop vertical jump than during drop landing, as measured 45 to 80 ms after initial contact (P < 0.05). Significant task-dependent effects in the peak knee abduction angle (P = 0.001) and the abduction moment (P = 0.029) were detected. The peak knee abduction angle and the abduction moment were greater during drop vertical jump than during drop landing. CONCLUSIONS: Subsequent jumps cause greater knee abduction during the early landing phase only in female subjects. This finding may relate to the sex discrepancy in non-contact anterior cruciate ligament injuries. Additionally, the presence of a subsequent jump significantly increases the peak knee abduction angle and the peak knee abduction moment during landings. Therefore, compared with a landing task without a subsequent jump (drop landing), a landing task with a subsequent jump (drop vertical jump) may be advantageous for screening for knee abduction control, especially in female athletes.

Factors Affecting Bone Mineral Density Among Snowy Region Residents in Japan: Analysis Using Multiple Linear Regression and Bayesian Network Model.
Teppei Suzuki, Tomoko Shimoda, Noriko Takahashi, Kaori Tsutsumi, Mina Samukawa, Sadako Yoshimura, Katsuhiko Ogasawara
Interactive journal of medical research, 7, 1, e10, {JMIR} Publications Inc., 2018年05月22日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: As the onset of osteoporosis leads to reduced activities of daily living and may result in patients being bedridden, efforts to prevent decreased bone density are necessary. Various studies on the relationship between sex, age, nutrients, and exercise habits and bone mineral density have been conducted to date. However, for snowy region residents, the magnitude of influence of various factors affecting bone mineral density and the influence level have not been clarified. OBJECTIVE: This study aimed to clarify the degree of influence and factors influencing bone mineral density based on survey results on health conditions and lifestyle habits in heavy snow areas. METHODS: A total of 354 citizens who visited a drugstore in the target area were included in a study that included using the brief-type self-administered diet history questionnaire on lifestyle and exercise habits. Height, weight, body composition, and bone densitometer values were analyzed using multiple regression to calculate their association with bone mineral density. In addition, a Bayesian network model was used to determine the influence level of each factor as a conditional probability. RESULTS: Multiple regression analysis revealed that age, sex, fracture, and calcium intake significantly influenced bone mineral density. In addition, the result of Bayesian network analysis suggested that age and sex affected bone mineral density, whereas nutrients and exercise habits might not have a direct impact. However, calcium intake and the T-score were significant factors affecting the presence or absence of fracture experiences, suggesting that adequate calcium intake is essential for preventing fractures. CONCLUSIONS: In the multiple regression analysis, age, sex, fracture, and calcium intake were selected as factors; however, in the Bayesian analysis, only age and sex affected bone mineral density while nutrients did not. In addition, the fact that calcium intake and the T-score were shown to affect bone fracture history suggests that calcium intake is an important measure that can prevent bone fractures. Overall, these results suggest that measures such as ensuring a bone fracture-free environment and providing nutritional advice for calcium intake can be effective in preventing bone loss.

Coupling motion between rearfoot and hip and knee joints during walking and single-leg landing.
Yuta Koshino, Masanori Yamanaka, Yuya Ezawa, Takumi Okunuki, Tomoya Ishida, Mina Samukawa, Harukazu Tohyama
Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, 37, 75, 83, 2017年12月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Quadriceps force and anterior tibial force occur obviously later than vertical ground reaction force: a simulation study.
Ryo Ueno, Tomoya Ishida, Masanori Yamanaka, Shohei Taniguchi, Ryohei Ikuta, Mina Samukawa, Hiroshi Saito, Harukazu Tohyama
BMC musculoskeletal disorders, 18, 1, 467, 467, 2017年11月18日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Toe-in Landing Increases the Ankle Inversion Angle and Moment During Single-Leg Landing: Implications in the Prevention of Lateral Ankle Sprains.
Yuta Koshino, Tomoya Ishida, Masanori Yamanaka, Mina Samukawa, Takumi Kobayashi, Harukazu Tohyama
Journal of sport rehabilitation, 26, 6, 530, 535, 2017年11月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, CONTEXT: Identifying the foot positions that are vulnerable to lateral ankle sprains is important for injury prevention. The effects of foot position in the transverse plane on ankle biomechanics during landing are unknown. OBJECTIVE: To examine the effects of toe-in or toe-out positioning on ankle inversion motion and moment during single-leg landing. DESIGN: Repeated measures. SETTING: Motion analysis laboratory. PARTICIPANTS: 18 healthy participants (9 men and 9 women). INTERVENTIONS: Participants performed single-leg landing trials from a 30-cm high box under 3 conditions: natural landing, foot internally rotated (toe-in), and foot externally rotated (toe-out). MAIN OUTCOME MEASURES: 4 toe-in or toe-out angles were calculated against 4 reference coordinates (laboratory, pelvis, thigh, and shank) in the transverse plane. Ankle inversion angle, angular velocity, and external moment in the 200 ms after initial foot-to-ground contact were compared between the 3 landing conditions. RESULTS: All toe-in or toe-out angles other than those calculated against the shank were significantly different between each of the 3 landing conditions (P < .001). Ankle inversion angle, angular velocity, and moment were highest during toe-in landings (P < .01), while eversion angle and moment were highest during toe-out landings (P < .001). The effect sizes of these differences were large. Vertical ground reaction forces were not different between the 3 landing conditions (P = .290). CONCLUSIONS: Toe-in or toe-out positioning during single-leg landings impacts on ankle inversion and eversion motion and moment. Athletes could train not to land with the toe-in positioning to prevent lateral ankle sprains.

体幹回旋を伴う上肢運動時の体幹ローカル筋筋活動onsetの検討　　　　　　　　　　　　　　　
大須賀 聡, 山中 正紀, 三浦 拓也, 齋藤 優輝, 上野 亮, 寒川 美奈, 齊藤 展士, 遠山 晴一
理学療法学, 44, Suppl.2, P, 2, (公社)日本理学療法士協会, 2017年04月
日本語

自家膝屈筋腱を用いた膝前十字靱帯再建術後患者の膝関節屈曲角度による等速性膝関節屈伸トルクの違い
三上 兼太朗, 石田 知也, 渡邊 南, 鈴木 信, 松本 尚, 寒川 美奈, 金子 知, 井上 千春, 青木 喜満
北海道整形災害外科学会雑誌, 58, 2, 262, 263, 北海道整形災害外科学会, 2017年03月
日本語

Nutritional Status and Body Composition of Independently Living Older Adults in a Snowy Region of Japan
Tomoko Shimoda, Teppei Suzuki, Noriko Takahashi, Kaori Tsutsumi, Mina Samukawa, Shoko Yoshimachi, Teruaki Goto, Hisashi Enomoto, Nobuyuki Kise, Katsuhiko Ogasawara, Sadako Yoshimura
GERONTOLOGY AND GERIATRIC MEDICINE, 3, 2017年01月
英語, 研究論文（学術雑誌）

The relationship between the load on the knee joint during walking and the biomechanical characteristics of single-leg standing.
Takeshi Chiba, Masanori Yamanaka, Mina Samukawa, Hiroshi Saito, Kento Sabashi, Harukazu Tohyama
Journal of physical therapy science, 28, 8, 2199, 203, 2016年08月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, [Purpose] The purpose of the present study was to investigate the relationship between the external knee adduction moment (KAM) during walking and the biomechanical characteristics of single-leg standing in healthy subjects. [Subjects and Methods] Twenty-eight healthy subjects were recruited for this study. Data were collected while the subjects performed walking and single-leg standing using a motion analysis system with six digital video cameras and two force plates. Pearson's correlation coefficient was used to quantify the relationship between peak KAM during walking and single-leg standing. To determine whether the kinematic behavior of the pelvis and trunk during single-leg standing are associated with peak KAM during walking, Pearson's correlation coefficients were calculated and stepwise linear regression was performed. [Results] The peak KAM during single-leg standing was significantly correlated with that during walking. The peak KAM during walking was significantly correlated with the peak lateral lean of the trunk and the peak lateral tilt of the pelvis during single-leg standing. The results of stepwise linear regression analysis show the peak KAM during walking was partially explained by the peak lateral lean of the trunk during single-leg standing. [Conclusion] Our findings suggest that single-leg standing might be a useful method for predicting the peak KAM during walking.

Kinematics and muscle activities of the lower limb during a side-cutting task in subjects with chronic ankle instability.
Yuta Koshino, Tomoya Ishida, Masanori Yamanaka, Yuya Ezawa, Takumi Okunuki, Takumi Kobayashi, Mina Samukawa, Hiroshi Saito, Harukazu Tohyama
Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 24, 4, 1071, 80, 2016年04月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, PURPOSE: The purpose of the present study was to evaluate lower limb kinematics and muscular activities during walking, side-turning while walking, and side-cutting movement in athletes with chronic ankle instability and compare the results to those of athletes without chronic ankle instability. METHODS: Lower limb kinematics and muscular activities were evaluated in 10 athletes with chronic ankle instability and 10 healthy control athletes using a three-dimensional motion analysis system and surface electromyography during the 200-ms pre-initial contact (IC) and stance phases while walking, side-turning while walking, and side-cutting. RESULTS: During walking or side-turning while walking, there were no significant differences in kinematics or muscle activities between the subjects with and without chronic ankle instability. For the side-cutting task, however, ankle inversion angles during the 200-ms pre-IC and late stance phases [effect sizes (ESs) = 0.95-1.43], the hip flexion angle (ESs = 0.94-0.96) and muscular activities of the gastrocnemius medialis (ESs = 1.04-1.73) during the early stance phase were significantly greater in the athletes with chronic ankle instability than in the healthy control athletes. CONCLUSIONS: Alterations of kinematics in athletes with chronic ankle instability were found not only at the ankle but also at hip joints during the side-cutting movement. These alterations were not detected during walking or side-turning while walking. The findings of the present study indicate that clinicians should take into account the motion of the hip joint during the side-cutting movement in persons with chronic ankle instability. LEVEL OF EVIDENCE: III.

Drop vertical jumpにおけるハムストリングスの着地前活動と着地中の膝関節外反角度および外反モーメントとの関係．　　　　　　　　　　　　　　　
生田亮平, 石田知也, 山中正紀, 谷口翔平, 上野 亮, 越野裕太, 寒川美奈, 遠山晴一
日本臨床スポーツ医学会学会誌, 24, 71, 77, 2016年, ［査読有り］

骨盤底筋群に対する感覚フィードバックが骨盤底挙上量に及ぼす影響．　　　　　　　　　　　　　　　
寒川 美奈, 石塚 利光, 岡橋 優子
日本女性骨盤底学会誌, 13, 163, 166, 2016年

Comparing trapezius muscle activity in the different planes of shoulder elevation.
Tomonobu Ishigaki, Tomoya Ishida, Mina Samukawa, Hiroshi Saito, Motoki Hirokawa, Yuya Ezawa, Makoto Sugawara, Harukazu Tohyama, Masanori Yamanaka
Journal of physical therapy science, 27, 5, 1495, 7, 2015年05月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, [Purpose] The purpose of this study was to compare the upper, middle, and lower trapezius muscles' activity in the different planes of shoulder elevation. [Subjects] Twenty male subjects volunteered for this study. [Methods] Surface electromyographic (EMG) activity for each of the three regions of the trapezius muscles in the three different planes of elevation were collected while the participants maintained 30, 60, and 90 degrees of elevation in each plane. The EMG data were normalized with maximum voluntary isometric contraction (%MVIC), and compared among the planes at each angle of elevation. [Results] There were significantly different muscle activities among the elevation planes at each angle. [Conclusion] This study found that the three regions of the trapezius muscles changed their activity depending on the planes of shoulder elevation. These changes in the trapezius muscles could induce appropriate scapular motion to face the glenoid cavity in the correct directions in different planes of shoulder elevation.

Does restriction of glenohumeral horizontal adduction reflect posterior capsule thickening of the throwing shoulder?
Tomonobu Ishigaki, Tomoya Ishida, Mina Samukawa, Hiroshi Saito, Yuya Ezawa, Motoki Hirokawa, Takumi Kato, Makoto Sugawara, Harukazu Tohyama, Masanori Yamanaka
Journal of physical therapy science, 27, 5, 1299, 302, 2015年05月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, [Purpose] Glenohumeral posterior capsule tightness possibly relates to posterior capsule thickness (PCT). The purpose of the current study was to analyze the relationships between PCT and glenohumeral range of motion (ROM) in horizontal adduction (HAdd) and internal rotation (IR). [Subjects and Methods] This study recruited 39 healthy collegiate baseball players. We measured PCT by using ultrasonography and ROM of the glenohumeral joint of the throwing shoulder by using a digital inclinometer. Pearson's correlation coefficients were calculated between PCT and HAdd or IR ROM. [Results] There was no correlation between PCT and HAdd ROM, but PCT was significantly correlated with IR ROM. [Conclusion] This result indicates that posterior shoulder capsule tightness only relates to IR ROM, and that restricted HAdd ROM might reflect tightness of other tissue, such as the posterior deltoid.

Individuals with chronic low back pain do not modulate the level of transversus abdominis muscle contraction across different postures.
Takuya Miura, Masanori Yamanaka, Kengo Ukishiro, Harukazu Tohyama, Hiroshi Saito, Mina Samukawa, Takumi Kobayashi, Takumi Ino, Naoki Takeda
Manual therapy, 19, 6, 534, 40, 2014年12月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Rehabilitation Exercises to Induce Balanced Scapular Muscle Activity in an Anti-gravity Posture.
Tomonobu Ishigaki, Masanori Yamanaka, Motoki Hirokawa, Keita Tai, Yuya Ezawa, Mina Samukawa, Harukazu Tohyama, Makoto Sugawara
Journal of physical therapy science, 26, 12, 1871, 4, 2014年12月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, [Purpose] The purpose of this study was to compare the intramuscular balance ratios of the upper trapezius muscle (UT) and the lower trapezius muscle (LT), and the intermuscular balance ratios of the UT and the serratus anterior muscle (SA) among prone extension (ProExt), prone horizontal abduction with external rotation (ProHAbd), forward flexion in the side-lying position (SideFlex), side-lying external rotation (SideEr), shoulder flexion with glenohumeral horizontal abduction load (FlexBand), and shoulder flexion with glenohumeral horizontal adduction load (FlexBall) in the standing posture. [Methods] The electromyographic (EMG) activities of the UT, LT and SA were measured during the tasks. The percentage of maximum voluntary isometric contraction (%MVIC) was calculated for each muscle, and the UT/LT ratios and the UT/SA ratios were compared among the tasks. [Results] The UT/LT ratio with the FlexBand was not significantly different from those of the four exercises in the side-lying and prone postures. The UT/SA ratio with the FlexBall demonstrated appropriate balanced activity. [Conclusion] In an anti-gravity posture, we recommend the FlexBand and the FlexBall for inducing balanced UT/LT and UT/SA ratios, respectively.

Lower limb joint motion during a cross cutting movement differs in individuals with and without chronic ankle instability.
Yuta Koshino, Masanori Yamanaka, Yuya Ezawa, Tomoya Ishida, Takumi Kobayashi, Mina Samukawa, Hiroshi Saito, Naoki Takeda
Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 15, 4, 242, 8, 2014年11月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, OBJECTIVE: To compare the kinematics of lower limb joints between individuals with and without chronic ankle instability (CAI) during cross-turn and -cutting movements. DESIGN: Cross-sectional study. SETTING: Motion analysis laboratory. PARTICIPANTS: Twelve subjects with CAI and twelve healthy controls. MAIN OUTCOME MEASURES: Hip flexion, adduction, and internal rotation, knee flexion, and ankle dorsiflexion and inversion angles were calculated in the 200 ms before initial ground contact and from initial ground contact to toe-off (stance phase) in a cross-turn movement during gait and a cross-cutting movement from a forward jump, and compared across the two groups. RESULTS: In the cross-cutting movement, the CAI group exhibited greater hip and knee flexion than the control group during the stance phase, and more hip abduction during the period before initial contact and the stance phase. In the cross-turn movement the joint kinematics were similar in the two groups. CONCLUSIONS: CAI subjects exhibited an altered pattern of the proximal joint kinematics during a cross-cutting movement. It is important for clinicians to assess the function of the hip and knee as well as the ankle, and to incorporate coordination training for the entire lower limb into rehabilitation after lateral ankle sprains.

Characteristics of postural muscle activation patterns induced by unexpected surface perturbations in elite ski jumpers.
Hiroki Mani, Tatsuya Izumi, Tomoya Konishi, Mina Samukawa, Keizo Yamamoto, Kazuhiko Watanabe, Tadayoshi Asaka
Journal of physical therapy science, 26, 6, 833, 9, 2014年06月, ［査読有り］, ［国内誌］
英語, 研究論文（学術雑誌）, [Purpose] This study investigated the characteristics of postural control following postural disturbance in elite athletes. [Subjects] Ten elite ski jumpers and ten control subjects participated in this study. [Methods] Subjects were required to maintain balance without stepping following unexpected horizontal surface perturbation in a forward or backward direction. [Results] A lower and reproducible peak magnitude of the center of mass velocity was shown in the athlete group compared to the control group. Cross-correlation analyses showed longer time lags at the moment of peak correlation coefficient between trunk flexor and extensor muscle activities, and shorter time lags and higher correlations between ankle flexor and extensor muscle activities were shown in the athlete group than in the control group. [Conclusion] The elite ski jumpers showed superior balance performance following surface perturbations, more reciprocal patterns in agonist-antagonist pairs of proximal postural muscles, and more co-contraction patterns in distal postural muscles during automatic postural responses than control individuals. This strategy may be useful in sports requiring effective balance recovery in environments with a dynamically changing surface, as well as in rehabilitation.

スキー競技における膝前十字靭帯再建術後からの復帰
寒川 美奈
理学療法学, 40, 8, 624, 625, 日本理学療法士学会, 2013年
日本語

荷重量移動課題の運動特性について.
笠原敏史, 斎藤展士, 寒川美奈, 水鳥武蔵, 廣瀬利彦, 戸塚満久
理学療法科学, 28, 3, 395, 398, The Society of Physical Therapy Science, 2013年, ［査読有り］
日本語, 研究論文（学術雑誌）, 〔目的〕運動療法で用いられる荷重移動課題において荷重量の大きさと運動速度の影響を明らかにする．〔対象〕健常若年者6名（平均年齢20.8±0.8歳）とした．〔方法〕視覚誘導型の荷重量移動課題を異なる運動方向，荷重量，運動周波数で行った．床反力計から得られた被験者の荷重量と視標の誤差を空間誤差と時間誤差に分けて課題間で比較した．〔結果〕空間及び時間誤差は運動方向に影響を受けなかった．軽い荷重量での空間誤差は重い荷重量に比べ有意に増加した．時間誤差は荷重量に影響を受けず，運動周波数とともに増大していた．〔結語〕荷重量移動課題時，空間的誤差は荷重量の大きさ，時間的誤差は運動速度の影響を受ける．

卓越した代償的姿勢反応の特性について:─姿勢筋活動の特徴─
泉 達弥, 小西 智也, 萬井 太規, 三浦 宏介, 津田 章代, 寒川 美奈, 山本 敬三, 浅賀 忠義
理学療法学Supplement, 2011, 0, Ab0662, Ab0662, 公益社団法人 日本理学療法士協会, 2012年
日本語, 【目的】 転倒の主たる原因として，スリップや乗り物の発進・停止時などの床面水平外乱が挙げられる．以前から，外乱後のFeedback制御である代償的姿勢反応について調べられており，姿勢筋活動の特徴として活動開始時間や筋活動パターンについて報告されてきた（Horak & Nashner,1986;Tokuno,2010）．しかしながら，姿勢反応に関する既往報告の多くは一般健常者および障害者を対象としており，優れた姿勢回復能力が要求される卓越した姿勢制御の特性についてはほとんど知られていない．この特性の解明により，水平外乱に対する転倒予防のための学習効果の目標が明確になるとともに，効果的な学習方法の開発が期待できる．従って，本研究の目的は床面水平外乱に対する卓越した代償的姿勢反応の筋活動の特性を明らかにすることだった．一般に，アスリートは一般健常者と比較して優れたバランス能力を有しており（Calavalle,2008;Asseman,2008），さらにトップアスリートは地域レベルのアスリートよりも高いバランス能力を有する（Mason & Pelgrim,1986; Mononen,2007）．よって，床面水平外乱に類似した競技特性のトップアスリートを対象とし一般健常者と比較検討した．我々の仮説はトップアスリートは一般健常者よりも，1) 外乱後の筋活動開始時刻（EMG onset）が早い，2) 筋活動量は急激に増加する，3) 体幹・下肢の主動筋と拮抗筋の同時収縮性が低いだった． 【方法】 対象：国際大会出場レベルのスキージャンパー10名（年齢:19.9 ± 2.3歳，身長:168.2 ± 7.9 cm，体重:56.1 ± 5.22 Kg）および健常若年者10名（年齢:21.6 ± 0.8歳，身長:165.6 ± 11.3 cm, 体重:57.3 ± 10.0 Kg）を対象とした．2．使用機器：1）床面水平刺激装置（前後2 方向）：水平移動5cm，最大速度13cm/sec （小外乱），水平移動10cm，最大速度39cm/sec （大外乱）とした．2）三次元動作解析システム：一側矢状面上の頭部・体幹・上肢・下肢の9マーカー座標を200Hzで収集した．刺激装置上に刺激開始時刻決定のためのマーカーを付けた．3）表面筋電計：一側の前脛骨筋，外側腓腹筋，内側腓腹筋，ヒラメ筋，大腿直筋，外側広筋，大腿二頭筋，半腱様筋，腹直筋，脊柱起立筋の10姿勢筋から筋活動を導出した（1KHz）．3．実験方法：被験者は刺激装置上に上肢を体側に垂らし自然立位をとった．外乱後にステップを踏まないように指示した．4課題（2外乱×2方向），各課題15回ずつ計60回をランダムに実施し，外乱は検者がランダムなタイミングで誘発した．4．解析：EMG onsetは，外乱開始前100ms間の筋活動の平均値±3SDの値を少なくとも25ms間持続した時刻とした．積分筋電値は各筋ごとに全施行の最大値で標準化し，EMG onsetから25ms間を bin 1，26msから50msまでをbin 2とし，各binごとの値を算出した．自動姿勢反応期である外乱後70～180 ms（Horak & Nashner,1986）の下腿・大腿・体幹の主動筋・拮抗筋の関係性を，Co-contraction index（Falconer etc,1985）を用いて定量化した．この値が大きいほど同時収縮が強いことを意味する．統計解析には EMG onset は各筋ごと，積分筋電値は bin ごと，またCo-contraction indexは体幹・下肢の屈曲・伸展筋群のペアごとにunpaired t-testを用いて2群間の比較を行った．危険率は5%とした．【説明と同意】 実験前に，被験者に十分な説明を行い署名にて同意を得た.本研究は所属機関の倫理委員会の承認を得ている．【結果】 1) EMG onset: 前方への大外乱時，アスリート群は健常若年者群よりも前脛骨筋で有意に遅い筋活動がみられた(p < 0.05)．2) 積分筋電値: 前方への大外乱時に外側広筋の bin 1でアスリート群は健常若年者群よりも有意に大きかったが(p < 0.05), bin 2では有意差がみられなかった．また，後方への大外乱時に半腱様筋の bin 1でアスリート群は健常若年者群よりも有意に大きな傾向があったが(p = 0.054), bin 2では有意差がみられなかった．3) Co-contraction index: 前方への大外乱時に体幹筋のindex値がアスリート群は健常若年者群よりも有意に小さかった(p < 0.05)．【考察】 積分筋電値bin 1 とbin 2の結果から，アスリート群は健常若年者群よりも筋活動量を活動直後に急激に増大させていることが示唆される (仮説2）．また，Co-contraction indexの結果から，アスリート群は健常若年者群よりも体幹筋の同時収縮性が低いことが示唆される(仮説3）．仮説1に反して前脛骨筋のEMG onsetはアスリート群の方が遅延していた．スキーヤーは長期間スキーブーツを装着するため足関節の固定性が高められることが一要因として考えられる（Bennel et al.1994）．【理学療法学研究としての意義】 本研究で明らかとなった床面水平外乱に対する姿勢筋活動の特性は，効果的な姿勢回復のためのバランス練習の指標および新たな運動療法を考案するための基礎資料となる．

The effects of dynamic stretching on plantar flexor muscle-tendon tissue properties.
Mina Samukawa, Masaki Hattori, Naoko Sugama, Naoki Takeda
Manual therapy, 16, 6, 618, 22, 2011年12月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Gender Differences in the Curl-up and the Double-leg-lower Tests
Satoshi Kasahara, Mina Samukawa, Tomonobu Ishigaki, Yusuke Torii
JOURNAL OF PHYSICAL THERAPY SCIENCE, 23, 3, 463, 467, 2011年06月, ［査読有り］
英語, 研究論文（学術雑誌）

Management of Patellar Tendinosis in a Freestyle Mogul Skier
Mina Samukawa
INTERNATIONAL JOURNAL OF ATHLETIC THERAPY & TRAINING, 16, 2, 12, 15, 2011年03月, ［査読有り］
英語, 研究論文（学術雑誌）

手術後の再受傷，再損傷予防の取り組み．スキーにおける予防の取り組み　　　　　　　　　　　　　　　
寒川美奈
臨床スポーツ医学, 28, 439, 443, 2011年

スキー外傷予防プログラムの効果検証に関する取り組み
森田寛子, 谷口圭吾, 加藤満, 中田周兵, 池田祐真, 佐藤太軌, 寒川美奈, 片寄正樹
日本スキー学会誌, 20, 1, 77, 81, 日本スキー学会誌編集事務局, 2010年
日本語

Analysis of tibial rotation using magnetic resonance imaging.
Mina Samukawa, Toru Yamamoto, Shigenori Miyamoto, Aogu Yamaguchi, Masaki Katayose
Manual therapy, 14, 6, 712, 5, 2009年12月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

スキー選手に対する膝前十字靭帯再建術後のリハビリテーション　　　　　　　　　　　　　　　
寒川美奈, 片寄正樹
臨床スポーツ医学, 26, 821, 827, 2009年

膝関節機能の評価法と臨床推論の進め方　　　　　　　　　　　　　　　
寒川美奈
理学療法, 25, 1304, 1310, 2009年

寒冷，高所環境でのスキー競技におけるコンディショニング　　　　　　　　　　　　　　　
寒川美奈
臨床スポーツ医学, 24, 179, 183, 2008年

The effect of tibial rotation on the presence of instability in the anterior cruciate ligament deficient knee.
Mina Samukawa, David Magee, Masaki Katayose
Journal of sport rehabilitation, 16, 1, 2, 17, 2007年02月, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

膝支持移動補助具の試作.　　　　　　　　　　　　　　　
高橋光彦, 笠原敏史, 齋藤展士, 寒川美奈
北海道理学療法士会誌, 22, 34, 37, 2005年, ［査読有り］
日本語, 研究論文（学術雑誌）

膝靭帯損傷・半月板損傷の理学療法のための検査・測定のポイントとその実際　　　　　　　　　　　　　　　
寒川美奈, 山中正紀
理学療法, 21, 141, 146, 2004年

ジャンプ着地動作時のアキレス腱張力に関係する足部三次元運動の解明
越野裕太, 石田知也, 渡邊謙太郎, 寒川美奈, 遠山晴一, デサントスポーツ科学(Web), 46, 2025年

【膝関節のスポーツ障害】膝周囲の腱症 膝周囲の腱症予防のためのコンディショニング
寒川 美奈, 石田 知也, 臨床スポーツ医学, 41, 1, 44, 46, 2024年01月
(株)文光堂, 日本語

高齢者における身体活動量と身体能力認識の関連　　　　　　　　　　　　　　　
千葉 愛未, 笠原 敏史, 江 林京, 石田 知也, 寒川 美奈, 千々松 雅人, 津田 英一, 遠山 晴一, The Japanese Journal of Rehabilitation Medicine, 60, 秋季特別号, S562, S562, 2023年10月
(公社)日本リハビリテーション医学会, 日本語

横断的2 女性メディカルスタッフ支援を再考する～持続可能なシステムは何か? 女性理学療法士における課題と持続可能な活動支援　　　　　　　　　　　　　　　
寒川 美奈, 日本臨床スポーツ医学会誌, 31, 4, S160, S160, 2023年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性足関節不安定症症例における片脚ヒールレイズ動作と片脚着地動作中の足関節キネマティクスの相関性　　　　　　　　　　　　　　　
渡邊 謙太郎, 越野 裕太, 中川 胡純, 石田 知也, 笠原 敏史, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 31, 4, S214, S214, 2023年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性足関節不安定症症例における疼痛と着地動作時の下肢関節kinematicsの関連　　　　　　　　　　　　　　　
中川 胡純, 越野 裕太, 渡邊 謙太郎, 石田 知也, 寒川 美奈, 笠原 敏史, 遠山 晴一, 日本臨床スポーツ医学会誌, 31, 4, S215, S215, 2023年10月
(一社)日本臨床スポーツ医学会, 日本語

筋力調整能力へのランダム練習の有効性について
笠原 敏史, 衛 雨亭, 江 林京, 千葉 愛未, 石田 知也, 寒川 美奈, 遠山 晴一, 基礎理学療法学, 25, Suppl.1, 119, 119, 2023年01月
(一社)日本基礎理学療法学会, 日本語

【女性アスリートのサポートを考える】アスレティックトレーナーの立場から 女性アスリートに多い問題とケア
寒川 美奈, 整形・災害外科, 65, 12, 1561, 1566, 2022年11月
金原出版(株), 日本語

【女性アスリートのサポートを考える】アスレティックトレーナーの立場から 女性アスリートに多い問題とケア
寒川 美奈, 整形・災害外科, 65, 12, 1561, 1566, 2022年11月
金原出版(株), 日本語

足関節靱帯損傷の予防に向けた機能評価 足関節靱帯損傷の再受傷予防のための動作評価
越野 裕太, 渡邊 謙太郎, 石田 知也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S191, S191, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

成長期アスリートにおけるジャンプ着地動作特性の検討
高木 瑛梨, 寒川 美奈, 石田 知也, 笠原 敏史, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S222, S222, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性足関節不安定症症例における底屈筋の筋出力調整能力について
三品 万純, 笠原 敏史, 越野 裕太, 渡邊 謙太郎, 石田 知也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S312, S312, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

膝前十字靱帯再建術後の両脚スクワット動作における膝関節伸展モーメントの非対称性と骨盤回旋の関連
石田 知也, 寒川 美奈, 越野 裕太, 井野 拓実, 笠原 敏史, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S355, S355, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

足関節靱帯損傷の予防に向けた機能評価 足関節靱帯損傷の再受傷予防のための動作評価
越野 裕太, 渡邊 謙太郎, 石田 知也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S191, S191, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

成長期アスリートにおけるジャンプ着地動作特性の検討
高木 瑛梨, 寒川 美奈, 石田 知也, 笠原 敏史, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S222, S222, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性足関節不安定症症例における底屈筋の筋出力調整能力について
三品 万純, 笠原 敏史, 越野 裕太, 渡邊 謙太郎, 石田 知也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S312, S312, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

膝前十字靱帯再建術後の両脚スクワット動作における膝関節伸展モーメントの非対称性と骨盤回旋の関連
石田 知也, 寒川 美奈, 越野 裕太, 井野 拓実, 笠原 敏史, 遠山 晴一, 日本臨床スポーツ医学会誌, 30, 4, S355, S355, 2022年10月
(一社)日本臨床スポーツ医学会, 日本語

【ACL損傷・再建術-レビューとアップデート-】ACL再建術後の評価 ACL再建膝に対する運動動作の評価
石田 知也, 寒川 美奈, 遠山 晴一, 臨床スポーツ医学, 39, 9, 948, 953, 2022年09月
(株)文光堂, 日本語

【ACL損傷・再建術-レビューとアップデート-】ACL再建術後の競技復帰と問題点 ACL再建術後の競技復帰と問題点 スキー
寒川 美奈, 臨床スポーツ医学, 39, 9, 984, 987, 2022年09月
(株)文光堂, 日本語

下腿三頭筋に対するスタティックおよびダイナミックストレッチングが片脚立位中の姿勢安定性に与える即時効果　　　　　　　　　　　　　　　
大場 健裕, 田中 みのり, 東谷 直音, 寒川 美奈, 体力科学, 71, 3, 303, 303, 2022年06月
(一社)日本体力医学会, 日本語

スポーツとリハビリテーション治療 女性アスリートサポートからみるトータルサポートの重要性　　　　　　　　　　　　　　　
寒川 美奈, The Japanese Journal of Rehabilitation Medicine, 特別号, S233, S233, 2022年05月
(公社)日本リハビリテーション医学会, 日本語

下肢スポーツ外傷・障害に対する予防戦略
遠山 晴一, 寒川 美奈, 石田 知也, 越野 裕太, 日本整形外科学会雑誌, 96, 3, S569, S569, 2022年03月
(公社)日本整形外科学会, 日本語

呼吸法指導が女性の黄体期における精神的ストレスへ与える効果　　　　　　　　　　　　　　　
岡崎 美琴, 菅野 千晶, 小松崎 美帆, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ハムストリング肉離れ後に生じる等尺性・等速性最大膝屈曲筋力の非対称性と収縮様式間の関連性　　　　　　　　　　　　　　　
奈良 銀二, 寒川 美奈, 越野 裕太, スポーツ理学療法学, 2, Suppl., OS, 05, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ダイナミックストレッチングの実施速度が足関節底屈筋の筋腱伸張性に与える影響　　　　　　　　　　　　　　　
京谷 直音, 寒川 美奈, 大場 健裕, 菅野 千晶, 高橋 由弥, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 03, 2022年
(一社)日本スポーツ理学療法学会, 日本語

筋腱スティフネス低下に必要なストレッチング時間の性差　　　　　　　　　　　　　　　
小松崎 美帆, 寒川 美奈, 鈴木 悠季乃, 大場 健祐, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 04, 2022年
(一社)日本スポーツ理学療法学会, 日本語

足関節底背屈筋に対するダイナミックストレッチングが片脚立位姿勢安定性に与える効果　　　　　　　　　　　　　　　
田中 みのり, 大場 健裕, 京谷 直音, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

片脚着地後に続くジャンプ動作が着地時の膝外反モーメントおよび体幹、骨盤キネマティクスに与える影響　　　　　　　　　　　　　　　
千々松 雅人, 石田 知也, 山中 正紀, 谷口 翔平, 上野 亮, 寒川 美奈, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 02, 2022年
(一社)日本スポーツ理学療法学会, 日本語

投球数の増加に伴う肘関節内側裂隙間距離と投球パフォーマンスの変化　　　　　　　　　　　　　　　
高橋 由弥, 寒川 美奈, 京谷 直音, 菅野 千晶, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

成長期男子アスリートのジャンプ着地動作特性 異なる成長期分類による検討　　　　　　　　　　　　　　　
並木 隆浩, 寒川 美奈, 高木 瑛梨, 京谷 直音, 小松崎 美帆, 奈良 銀二, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

スキーブーツ装着による下肢関節間の機能的役割の変化 モーグルスキー選手の競技動作特性 Pilot study　　　　　　　　　　　　　　　
井野 拓実, 松本 尚, 伊藤 雄, 伊藤 孔一, 山口 聖太, 武井 侑理, 石田 知也, 遠山 晴一, 寒川 美奈, スポーツ理学療法学, 2, Suppl., PS, 07, 2022年
(一社)日本スポーツ理学療法学会, 日本語

スタティックストレッチングが瞬発的筋力発揮に与える影響 性差についての検討　　　　　　　　　　　　　　　
亀割 由奈, 小松崎 美帆, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ソフトボール競技におけるオーバーヘッドスロー動作が肘関節外反制動機能に与える影響　　　　　　　　　　　　　　　
野村 真希, 寒川 美奈, 高橋 由弥, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

膝前十字靱帯再建術後の大腿四頭筋筋力低下の残存と両脚スクワット動作における膝関節伸展モーメントの非対称性との関連　　　　　　　　　　　　　　　
石田 知也, 寒川 美奈, 越野 裕太, 井野 拓実, 笠原 敏文, 遠山 晴一, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

呼吸法指導が女性の黄体期における精神的ストレスへ与える効果　　　　　　　　　　　　　　　
岡崎 美琴, 菅野 千晶, 小松崎 美帆, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ハムストリング肉離れ後に生じる等尺性・等速性最大膝屈曲筋力の非対称性と収縮様式間の関連性　　　　　　　　　　　　　　　
奈良 銀二, 寒川 美奈, 越野 裕太, スポーツ理学療法学, 2, Suppl., OS, 05, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ダイナミックストレッチングの実施速度が足関節底屈筋の筋腱伸張性に与える影響　　　　　　　　　　　　　　　
京谷 直音, 寒川 美奈, 大場 健裕, 菅野 千晶, 高橋 由弥, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 03, 2022年
(一社)日本スポーツ理学療法学会, 日本語

筋腱スティフネス低下に必要なストレッチング時間の性差　　　　　　　　　　　　　　　
小松崎 美帆, 寒川 美奈, 鈴木 悠季乃, 大場 健祐, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 04, 2022年
(一社)日本スポーツ理学療法学会, 日本語

足関節底背屈筋に対するダイナミックストレッチングが片脚立位姿勢安定性に与える効果　　　　　　　　　　　　　　　
田中 みのり, 大場 健裕, 京谷 直音, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

投球数の増加に伴う肘関節内側裂隙間距離と投球パフォーマンスの変化　　　　　　　　　　　　　　　
高橋 由弥, 寒川 美奈, 京谷 直音, 菅野 千晶, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

成長期男子アスリートのジャンプ着地動作特性 異なる成長期分類による検討　　　　　　　　　　　　　　　
並木 隆浩, 寒川 美奈, 高木 瑛梨, 京谷 直音, 小松崎 美帆, 奈良 銀二, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., OS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

スキーブーツ装着による下肢関節間の機能的役割の変化 モーグルスキー選手の競技動作特性 Pilot study　　　　　　　　　　　　　　　
井野 拓実, 松本 尚, 伊藤 雄, 伊藤 孔一, 山口 聖太, 武井 侑理, 石田 知也, 遠山 晴一, 寒川 美奈, スポーツ理学療法学, 2, Suppl., PS, 07, 2022年
(一社)日本スポーツ理学療法学会, 日本語

スタティックストレッチングが瞬発的筋力発揮に与える影響 性差についての検討　　　　　　　　　　　　　　　
亀割 由奈, 小松崎 美帆, 石田 知也, 寒川 美奈, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

ソフトボール競技におけるオーバーヘッドスロー動作が肘関節外反制動機能に与える影響　　　　　　　　　　　　　　　
野村 真希, 寒川 美奈, 高橋 由弥, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

膝前十字靱帯再建術後の大腿四頭筋筋力低下の残存と両脚スクワット動作における膝関節伸展モーメントの非対称性との関連　　　　　　　　　　　　　　　
石田 知也, 寒川 美奈, 越野 裕太, 井野 拓実, 笠原 敏文, 遠山 晴一, スポーツ理学療法学, 2, Suppl., PS, 06, 2022年
(一社)日本スポーツ理学療法学会, 日本語

腰部疾患における手術後に残存する能力障害を予測する手術前因子の検討
三木貴弘, 三木貴弘, 近藤湧, 渡邊勇太, 樋口大輔, 寒川美奈, 竹林庸雄, 北海道理学療法士学術大会(Web), 73rd, 2022年

過度な足部回内が骨盤および下肢アライメントに与える影響-異なる膝屈曲角度条件による検討-
千田周也, 千田周也, 越野裕太, 越野裕太, 山中正紀, 奥貫拓実, 寒川美奈, 遠山晴一, 日本臨床スポーツ医学会誌, 30, 1, 2022年

立位時の足部形態が走行時の足部キネマティクスに与える影響 接地パターンによる差異の検討
奥貫 拓実, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 29, 3, 392, 399, 2021年08月
(一社)日本臨床スポーツ医学会, 日本語

若年理学療法士における尿失禁有訴率の実態調査(第二報)　　　　　　　　　　　　　　　
岡谷内 美乃里, 寒川 美奈, 大内 みふか, 高橋 由依, 高羅 正成, 横山 美翔, 池内 里佳子, 内野 みのり, 理学療法学, 47, Suppl.1, P, 119, 2021年03月
(一社)日本理学療法学会連合, 日本語

若年理学療法士における尿失禁有訴率の実態調査(第二報)　　　　　　　　　　　　　　　
岡谷内 美乃里, 寒川 美奈, 大内 みふか, 高橋 由依, 高羅 正成, 横山 美翔, 池内 里佳子, 内野 みのり, 理学療法学, 47, Suppl.1, P, 119, 2021年03月
(公社)日本理学療法士協会, 日本語

AIによる動作解析の妥当性検定と臨床応用　　　　　　　　　　　　　　　
井野 拓実, 寒川 美奈, 遠山 晴一, 石田 知也, 小野 沙也佳, 藤田 向陽, 佐藤 洋一郎, 和田 直史, 山中 正紀, 理学療法学, 47, Suppl.1, O1, 1, 2021年03月
(公社)日本理学療法士協会, 日本語

ハムストリングスの肉離れが異なる膝屈曲角度における等尺性膝最大屈曲筋力に与える影響　　　　　　　　　　　　　　　
奈良 銀二, 寒川 美奈, 大場 健裕, 越野 裕太, 笠原 敏史, 石田 知也, 遠山 晴一, スポーツ理学療法学, 1, Suppl., SS, 03, 2021年
(一社)日本スポーツ理学療法学会, 日本語

AIによる動作解析の精度検証(第2報) AI解析vs人による解析　　　　　　　　　　　　　　　
井野 拓実, 寒川 美奈, 遠山 晴一, 石田 知也, 高橋 樹, 和田 直史, 佐藤 洋一郎, 山中 正紀, スポーツ理学療法学, 1, Suppl., OS, 04, 2021年
(一社)日本スポーツ理学療法学会, 日本語

スタティックストレッチングが高齢者の姿勢制御に与える即時効果　　　　　　　　　　　　　　　
岡 出海, 寒川 美奈, 大場 健裕, 萬井 太規, 鈴木 哲平, 小笠原 克彦, スポーツ理学療法学, 1, Suppl., OS, 05, 2021年
(一社)日本スポーツ理学療法学会, 日本語

Constant torque stretchingとconstant angle stretchingが足関節底屈筋の力学的特性に与える効果の持続について　　　　　　　　　　　　　　　
大場 健裕, 寒川 美奈, 千徳 風真, 小松崎 美帆, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 1, Suppl., OS, 05, 2021年
(一社)日本スポーツ理学療法学会, 日本語

前腕回内屈筋群の筋疲労が肘関節外反制動機能に与える影響　　　　　　　　　　　　　　　
高橋 由弥, 寒川 美奈, 奈良 昌哉, 鈴森 雄貴, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 1, Suppl., OS, 04, 2021年
(一社)日本スポーツ理学療法学会, 日本語

ダイナミックストレッチングにおける対象筋収縮の有無が筋腱伸張性に与える効果の検討　　　　　　　　　　　　　　　
京谷 直音, 寒川 美奈, 大場 健祐, 千徳 風真, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 1, Suppl., OS, 04, 2021年
(一社)日本スポーツ理学療法学会, 日本語

成長期サッカー選手の身長増加と片脚立位バランス能力について　　　　　　　　　　　　　　　
並木 隆浩, 寒川 美奈, 石垣 大輔, 高木 瑛梨, 石田 知也, 笠原 敏史, 遠山 晴一, スポーツ理学療法学, 1, Suppl., OS, 05, 2021年
(一社)日本スポーツ理学療法学会, 日本語

非特異的腰痛における機能障害への影響因子は罹患期間により異なる-階層的重回帰分析を用いた検討-
三木貴弘, 三木貴弘, 渡邊勇太, 樋口大輔, 寒川美奈, 竹林庸雄, 北海道理学療法士学術大会(Web), 72nd, 2021年

生物心理社会モデルに基づく非特異的腰痛に対する理学療法の進化
三木貴弘, 三木貴弘, 三木貴弘, 高崎博司, 寒川美奈, 竹林庸雄, Journal of Spine Research (Web), 12, 6, 2021年

慢性足関節不安定症症例における片脚ヒールレイズ中の後足部kinematicsと足底圧中心位置の特徴
秋元萌子, 渡邊謙太郎, 越野裕太, 越野裕太, 川原大輝, 石田知也, 寒川美奈, 笠原敏史, 遠山晴一, 日本臨床スポーツ医学会誌, 29, 4, 2021年

ダイナミックストレッチングが片脚ジャンプ着地におけるバランス能力に与える影響
齊藤咲南, 寒川美奈, 石田知也, 石田知也, 笠原敏史, 松本尚, 青喜満, 遠山晴一, 日本臨床スポーツ医学会誌, 29, 4, 2021年

スタティックストレッチングが筋腱伸張性へ与える影響ー性差の検討ー
小松崎美帆, 寒川美奈, 鈴木悠季乃, 大場健裕, 石田知也, 笠原敏史, 遠山晴一, 日本アスレティックトレーニング学会誌(Web), 7, Supplement, 2021年

局所冷却による伸張耐性の変化がスタティックストレッチングの効果に与える影響
千徳風真, 寒川美奈, 小松崎美帆, 大場健裕, 石田知也, 笠原敏史, 遠山晴ー, 日本アスレティックトレーニング学会誌(Web), 7, Supplement, 2021年

ACL再建術のリハビリテーション
井野拓実, 井野拓実, 寒川美奈, 北海道整形災害外科学会雑誌(Web), 63, 1, 2021年

若年者の運動習慣と身体認識誤差についての検討
千葉愛未, 笠原敏史, 江林京, 衛雨亭, 石田知也, 寒川美奈, 遠山晴一, 日本運動療法学会大会抄録集, 46th, 2021年

体幹へのスタティックストレッチングが女性の自律神経活動と主観的ストレスに与える影響
菅野千晶, 寒川美奈, 石田知也, 遠山晴一, 笠原敏史, 日本臨床スポーツ医学会誌, 29, 4, 2021年

【高齢者の膝関節の痛み】高齢者の膝関節痛と変形性膝関節症
井野 拓実, 寒川 美奈, 石田 知也, 理学療法ジャーナル, 55, 1, 37, 47, 2021年01月
(株)医学書院, 日本語

【スポーツ外傷・障害に対するリハビリテーションと装具療法】下肢スポーツ外傷・障害の受傷バイオメカニクスとリスク要因　　　　　　　　　　　　　　　
石田 知也, 井野 拓実, 越野 裕太, 寒川 美奈, 遠山 晴一, 日本義肢装具学会誌, 37, 1, 11, 18, 2021年01月
(一社)日本義肢装具学会, 日本語

【女性アスリートの運動器障害-悩みに答える】女性アスリートの運動器障害に対する理学療法
寒川 美奈, 臨床整形外科, 55, 12, 1321, 1324, 2020年12月
(株)医学書院, 日本語

アスリートへのハイドロリリース、徒手的アプローチによる対応 -機能改善とパフォーマンス向上のための活用- スポーツ現場における徒手的アプローチの有効性と活用
寒川 美奈, 日本臨床スポーツ医学会誌, 28, 4, S93, S93, 2020年10月
(一社)日本臨床スポーツ医学会, 日本語

アスリートに対するコンディショニングサポート　　　　　　　　　　　　　　　
寒川 美奈, CAMPUS HEALTH, 57, 1, 36, 37, 2020年03月
(公社)全国大学保健管理協会, 日本語

バレエダンサーの姿勢安定性と足趾筋力および足底感覚閾値との相関性について
齊藤 咲南, 萬井 太規, 石川 啓太, 種田 健二, 寒川 美奈, 石田 知也, 遠山 晴一, 浅賀 忠義, 日本臨床スポーツ医学会誌, 27, 4, S286, S286, 2019年11月
(一社)日本臨床スポーツ医学会, 日本語

バレエダンサーの姿勢安定性と足趾筋力および足底感覚閾値との相関性について
齊藤 咲南, 萬井 太規, 石川 啓太, 種田 健二, 寒川 美奈, 石田 知也, 遠山 晴一, 浅賀 忠義, 日本臨床スポーツ医学会誌, 27, 4, S286, S286, 2019年11月
(一社)日本臨床スポーツ医学会, 日本語

脊髄小脳変性症の遺伝子診断と近畿圏における病型
仲間 美奈, 西郷 和真, 平野 牧人, 濱田 征宏, 金城 ちなつ, 寒川 真, 長谷川 隆典, 北口 正孝, 三井 良之, 巽 純子, 田村 和朗, 楠 進, 日本遺伝カウンセリング学会誌, 40, 3, 95, 100, 2019年10月
(一社)日本遺伝カウンセリング学会, 日本語

アスリートに対するコンディショニングサポート　　　　　　　　　　　　　　　
寒川 美奈, 全国大学保健管理研究集会プログラム・抄録集, 57回, 27, 27, 2019年09月
(公社)全国大学保健管理協会, 日本語

スタティックストレッチングの伸張時間が筋の力生産能力へ与える影響　　　　　　　　　　　　　　　
中村 賢太郎, 寒川 美奈, 大場 健裕, 山中 正紀, 遠山 晴一, 理学療法学, 46, Suppl.1, 1, 1, 2019年08月
(公社)日本理学療法士協会, 日本語

内側・外側ウェッジが走行時の後足部運動と膝・股関節運動に及ぼす影響　　　　　　　　　　　　　　　
佐藤 冴香, 奥貫 拓実, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 理学療法学, 46, Suppl.1, 1, 5, 2019年08月
(公社)日本理学療法士協会, 日本語

後方からの降段動作が膝関節内側負荷に与える影響　　　　　　　　　　　　　　　
水野 歩, 井野 拓実, 佐橋 健人, 千葉 健, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 理学療法学, 46, Suppl.1, 2, 4, 2019年08月
(公社)日本理学療法士協会, 日本語

【下肢スポーツ外傷・障害を持つアスリートの競技復帰-復帰までの過程と復帰基準-】膝ACL再建術後の再受傷予防のためのリハビリテーション　　　　　　　　　　　　　　　
石田 知也, 寒川 美奈, 遠山 晴一, 臨床スポーツ医学, 36, 8, 868, 873, 2019年08月, ［招待有り］
(株)文光堂, 日本語

【下肢スポーツ外傷・障害を持つアスリートの競技復帰-復帰までの過程と復帰基準-】膝ACL再建術後の再受傷予防のためのリハビリテーション　　　　　　　　　　　　　　　
石田 知也, 寒川 美奈, 遠山 晴一, 臨床スポーツ医学, 36, 8, 868, 873, 2019年08月
(株)文光堂, 日本語

スタティックストレッチングの伸張時間が筋の力生産能力へ与える影響
中村 賢太郎, 寒川 美奈, 大場 健裕, 山中 正紀, 遠山 晴一, 理学療法学, 46, Suppl.1, 1, M, 2019年08月
(公社)日本理学療法士協会, 日本語

内側・外側ウェッジが走行時の後足部運動と膝・股関節運動に及ぼす影響　　　　　　　　　　　　　　　
佐藤 冴香, 奥貫 拓実, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 理学療法学, 46, Suppl.1, 1, M, 2019年08月
(公社)日本理学療法士協会, 日本語

後方からの降段動作が膝関節内側負荷に与える影響　　　　　　　　　　　　　　　
水野 歩, 井野 拓実, 佐橋 健人, 千葉 健, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 理学療法学, 46, Suppl.1, 2, O, 2019年08月
(公社)日本理学療法士協会, 日本語

AIによる動作解析 三次元動作解析による妥当性の検証　　　　　　　　　　　　　　　
井野 拓実, 寒川 美奈, 遠山 晴一, 石田 知也, 佐藤 洋一郎, JOSKAS, 44, 4, 459, 459, 2019年05月
(一社)日本関節鏡・膝・スポーツ整形外科学会, 日本語

AIによる動作解析 三次元動作解析による妥当性の検証　　　　　　　　　　　　　　　
井野 拓実, 寒川 美奈, 遠山 晴一, 石田 知也, 佐藤 洋一郎, JOSKAS, 44, 4, 459, 459, 2019年05月
(一社)日本関節鏡・膝・スポーツ整形外科学会, 日本語

超音波装置を用いたストレス荷重時の足関節前方移動距離計測の試み　　　　　　　　　　　　　　　
中谷 詩世, 館野 真理, 堀江 達則, 松本 和久, 寒川 美奈, 遠山 晴一, 堤 香織, 超音波検査技術, 44, 2, 277, 277, 2019年04月
(一社)日本超音波検査学会, 日本語

【筋機能III:筋機能障害に対する理学療法アプローチ】 変形性膝関節症の筋機能障害に対する理学療法アプローチ　　　　　　　　　　　　　　　
井野 拓実, 石田 知也, 寒川 美奈, 山中 正紀, 理学療法, 35, 12, 1070, 1079, 2018年12月, ［招待有り］
(株)メディカルプレス, 日本語

高校野球選手における投球障害予防に関する認識調査　　　　　　　　　　　　　　　
奈良 昌哉, 寒川 美奈, 鈴森 雄貴, 中村 賢太郎, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 4, S280, S280, 2018年11月
(一社)日本臨床スポーツ医学会, 日本語

高校野球選手における投球障害予防に関する認識調査　　　　　　　　　　　　　　　
奈良 昌哉, 寒川 美奈, 鈴森 雄貴, 中村 賢太郎, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 4, S280, S280, 2018年11月
(一社)日本臨床スポーツ医学会, 日本語

ストレッチングによる足関節背屈可動域の増大が片脚スクワット動作時の下肢kinematicsに与える影響　　　　　　　　　　　　　　　
千田 周也, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 4, S259, S259, 2018年11月
(一社)日本臨床スポーツ医学会, 日本語

ストレッチングによる足関節背屈可動域の増大が片脚スクワット動作時の下肢kinematicsに与える影響　　　　　　　　　　　　　　　
千田 周也, 越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 4, S259, S259, 2018年11月
(一社)日本臨床スポーツ医学会, 日本語

片脚着地動作における初期接地時の前額面骨盤傾斜と膝関節最大外反モーメントの関連
生田 亮平, 石田 知也, 山中 正紀, 谷口 翔平, 上野 亮, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 3, 431, 436, 2018年08月
(一社)日本臨床スポーツ医学会, 日本語

関節不安定症のバイオメカニクス 膝前十字靱帯損傷のバイオメカニクス　　　　　　　　　　　　　　　
遠山 晴一, 上野 亮, 石田 知也, 寒川 美奈, 日本整形外科学会雑誌, 92, 8, S1623, S1623, 2018年08月
(公社)日本整形外科学会, 日本語

高校生バスケットボール選手における膝前十字靱帯損傷の好発時期の検討　　　　　　　　　　　　　　　
石田 知也, 松本 尚, 鈴木 信, 井上 千春, 金子 知, 山中 正紀, 寒川 美奈, 遠山 晴一, 青木 喜満, 日本整形外科スポーツ医学会雑誌, 38, 4, 666, 666, 2018年08月
(一社)日本整形外科スポーツ医学会, 日本語

高校生バスケットボール選手における膝前十字靱帯損傷の好発時期の検討　　　　　　　　　　　　　　　
石田 知也, 松本 尚, 鈴木 信, 井上 千春, 金子 知, 山中 正紀, 寒川 美奈, 遠山 晴一, 青木 喜満, 日本整形外科スポーツ医学会雑誌, 38, 4, 666, 666, 2018年08月
(一社)日本整形外科スポーツ医学会, 日本語

関節不安定症のバイオメカニクス 膝前十字靱帯損傷のバイオメカニクス　　　　　　　　　　　　　　　
遠山 晴一, 上野 亮, 石田 知也, 寒川 美奈, 日本整形外科学会雑誌, 92, 8, S1623, S1623, 2018年08月
(公社)日本整形外科学会, 日本語

片脚着地動作における初期接地時の前額面骨盤傾斜と膝関節最大外反モーメントの関連　　　　　　　　　　　　　　　
生田 亮平, 石田 知也, 山中 正紀, 谷口 翔平, 上野 亮, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 26, 3, 431, 436, 2018年08月
(一社)日本臨床スポーツ医学会, 日本語

スポーツ障害に対する保存的治療のエビデンス 膝オーバーユース障害に対する保存的治療のエビデンス　　　　　　　　　　　　　　　
越野 裕太, 山中 正紀, 寒川 美奈, 遠山 晴一, 日本整形外科学会雑誌, 92, 7, 459, 465, 2018年07月
スポーツにおける膝オーバーユース障害に対する保存的治療の効果に関する定性的systematic reviewを行った。PubMed検索により、基準を満たす15編を特定した。Patellofemoral pain syndromeに対するインソールなどの足部装具単独による除痛効果は弱く、足部装具と理学療法の併用による除痛効果は中等度であった。膝蓋腱炎の治療に関して、七つの良質な無作為抽出比較試験(RCT)が大腿四頭筋遠心性強化訓練によって症状が改善したことを明らかにした。保存的治療に失敗した慢性膝蓋腱炎に対する多血小板血漿局所注射の除痛および膝機能改善の効果は一貫して良好であることが明らかとなった。また、中等度の質のRCTにおいて理学療法に抗炎症薬と鎮痛剤を併用した腸脛靱帯炎症例群は抗炎症薬のみを併用した群およびプラセボ群に比し、3〜7日後のランニング時の疼痛が有意に改善していた。, (公社)日本整形外科学会, 日本語

女性アスリートの健康問題と理学療法　　　　　　　　　　　　　　　
寒川 美奈, 理学療法, 34, 1101, 1105, 2017年12月

高齢女性における尿失禁と立ち上がり機能の関係性について　　　　　　　　　　　　　　　
寒川 美奈, 鈴木 哲平, 下田 智子, 堤 香織, 高橋 紀子, 高島 理沙, 辻 真太朗, 村田 和香, 良村 貞子, 小笠原 克彦, 日本未病システム学会学術総会抄録集, 24回, 134, 134, 2017年10月
(一社)日本未病学会, 日本語

ACL再建術後のプロトコル再考 再建術後2次前十字靱帯損傷予防の見地からの再考　　　　　　　　　　　　　　　
石田 知也, 山中 正紀, 寒川 美奈, 松本 尚, 青木 喜満, 遠山 晴一, 日本臨床スポーツ医学会誌, 25, 4, S121, S121, 2017年10月
(一社)日本臨床スポーツ医学会, 日本語

足部形態が片脚立位時の姿勢安定性および足関節周囲筋活動に与える影響の検討　　　　　　　　　　　　　　　
岡田 慎平, 越野 裕太, 遠山 晴一, 千田 周也, 五十嵐 將斗, 佐藤 冴香, 寒川 美奈, 山中 正紀, 日本臨床スポーツ医学会誌, 25, 4, S218, S218, 2017年10月
(一社)日本臨床スポーツ医学会, 日本語

大学スポーツ選手を対象とした慢性足関節不安定症の有病率とその特徴の検討　　　　　　　　　　　　　　　
村田 拓陸, 越野 裕太, 遠山 晴一, 佐藤 冴香, 千田 周也, 寒川 美奈, 山中 正紀, 日本臨床スポーツ医学会誌, 25, 4, S218, S218, 2017年10月
(一社)日本臨床スポーツ医学会, 日本語

足関節捻挫既往例における慢性足関節不安定症進展例と非進展例の疫学的特徴の相違　　　　　　　　　　　　　　　
越野 裕太, 山中 正紀, 村田 拓陸, 佐藤 冴香, 千田 周也, 寒川 美奈, 井上 雅之, 遠山 晴一, 日本臨床スポーツ医学会誌, 25, 4, S251, S251, 2017年10月
(一社)日本臨床スポーツ医学会, 日本語

片脚着地後のジャンプ動作が着地時の膝関節外反モーメントに与える影響　　　　　　　　　　　　　　　
千々松 雅人, 石田 知也, 山中 正紀, 谷口 翔平, 上野 亮, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 25, 4, S292, S292, 2017年10月
(一社)日本臨床スポーツ医学会, 日本語

歩行中の外的膝内転モーメントと片脚立位移行動作での生体力学的指標との関連　　　　　　　　　　　　　　　
千葉 健, 山中 正紀, 寒川 美奈, 齊藤 展士, 由利 真, 堀 弘明, 佐橋 健人, 遠山 晴一, 理学療法学, 44, Suppl.2, O, 2, 2017年04月
(一社)日本理学療法学会連合, 日本語

変形膝関節症症例におけるFunctional Reach TestとQOLとの相関性の検討　　　　　　　　　　　　　　　
佐橋 健人, 山中 正紀, 千葉 健, 寒川 美奈, 齊藤 展士, 由利 真, 堀 弘明, 遠山 晴一, 理学療法学, 44, Suppl.2, P, 1, 2017年04月
(一社)日本理学療法学会連合, 日本語

月経前症候群に対するストレッチング介入効果の検討　　　　　　　　　　　　　　　
横山 美翔, 寒川 美奈, 宮崎 未来, 石田 優子, 鈴森 雄貴, 生田 亮平, 奥貫 拓実, 佐橋 健人, 齊藤 展士, 遠山 晴一, 山中 正紀, 理学療法学, 44, Suppl.2, P, 1, 2017年04月
(一社)日本理学療法学会連合, 日本語

COMPARISON OF THE TRUNK AND PELVIC KINEMATICS DURING SINGLE-LEG STANDING BETWEEN INDIVIDUALS WITH KNEE OSTEOARTHRITIS AND HEALTHY SUBJECTS
T. Chiba, M. Yamanaka, K. Sabashi, M. Samukawa, H. Saitoh, M. Uri, T. Kobayashi, H. Tohyama, OSTEOARTHRITIS AND CARTILAGE, 25, S398, S398, 2017年04月
英語, 研究発表ペーパー・要旨（国際会議）

月経前症候群に対するストレッチング介入効果の検討
横山 美翔, 寒川 美奈, 宮崎 未来, 石田 優子, 鈴森 雄貴, 生田 亮平, 奥貫 拓実, 佐橋 健人, 齊藤 展士, 遠山 晴一, 山中 正紀, 理学療法学, 44, Suppl.2, P, YB, 2017年04月

【はじめに，目的】女性の月経周期は性ホルモンの変動によって形成される。近年，月経関連疾患に関する研究が多く行われてきている。月経前症候群（PMS）は，黄体期後期に生じ，月経開始とともに終了する精神的及び身体的症状であり，本国では5.3～11.8%の罹患率が報告されている。PMSの発生原因については未だ統一した見解は得られていないものの，自律神経活動に関して黄体期では卵胞期に比べ，副交感神経活動が低下し交感神経活動が優位であるといわれている。PMSに対する治療として運動療法の有効性が検証されているが，症状改善の要因は明確に示されておらず，介入方法や期間についても統一した見解が得られていない。そこで本研究は，交感神経活動抑制および副交感神経活動増加への効果が示されているスタティックストレッチング（SS）を用いて，PMSの有無によるSSの有効性を検証した。

【方法】対象はPMS症状を有する女子大学生7名（PMS群；年齢21.7±1.2歳），PMSを有さない女子大学生9名（非PMS群；年齢22.3±0.9歳）とした。月経翌日より計測した基礎体温により黄体期を確認し，基礎体温上昇翌日または翌々日にSSを指導及び実施し（1日目），前後でSSの即時効果を検討した（Pre，Post）。被験者にはセルフSSを6日間実施させ，1日目の7日後に再度測定（1week）を実施しSSの短期効果を検討した。SSはハムストリングス及び腰背部，股関節屈筋群及び大腿直筋，股関節内転筋群に対して各30秒4セット，セット間20秒の計12分間を実施した。評価指標は，心電図波形より心拍数（HR），交感神経活動を示す標準化低周波（%LF），副交感神経活動を示す標準化高周波（%HF）を算出した。統計解析は，反復測定一元配置分散分析を用いてSSの即時及び短期効果を比較検討した。有意水準はP＜0.05とした。

【結果】HRに関しては，PMS群において1weekがPre及びPostに比し有意な高値を示した（3群間：P=0.019，Pre-1week：P=0.026，Post-1week：P=0.042）。一方，%LF，%HFでは有意な変化はみられなかった。非PMS群は，全ての項目において有意な変化がなかった。

【結論】本研究結果より，PMS群では1weekのHRに有意な増加を示した。PMS症状は黄体後期に増強するといわれているが，交感神経活動の亢進とともに，HRの増加が促されたものと考えられた。しかしながら，本研究では%LFや%HFの変化はみられておらず，PMS群では交感神経活動の亢進がSSにより抑制された可能性が考えられた。したがってPMS症状の増強時にSSを実施する等，介入時期の検討が必要であることが示唆された。また非PMS群においては，全ての指標において有意な変化はみられておらず，自律神経活動への変化が生じていなかったことが考えられた。今回実施したSSにおける時間，強度，方法等が自律神経に影響を与えるには不十分であったことも考えられるため，更なる検討が必要であると思われた。

, (公社)日本理学療法士協会, 日本語

変形膝関節症症例におけるFunctional Reach TestとQOLとの相関性の検討
佐橋 健人, 山中 正紀, 千葉 健, 寒川 美奈, 齊藤 展士, 由利 真, 堀 弘明, 遠山 晴一, 理学療法学, 44, Suppl.2, P, MT, 2017年04月

【はじめに，目的】

変形性膝関節症（以下，膝OA）は高齢者の生活の質（以下，QOL）を低下させる主な要因の1つといわれている。近年，膝OA症例においてバランス能力が低下していることが数多く報告されてきた。膝OA症例におけるバランス能力低下は，QOLの低下を導く一因であると考えられ，過去にも検討されているものの一致した見解は得られていない。これらの先行研究の多くは静的バランスを動作課題としており，動的バランスとの関連を検討した研究は少ない。比較的日常生活動作に近いと思われるFunctional Reach Testのような動的バランス評価が，膝OA症例のQOLをより反映する可能性があると思われるが，その関連は不明である。したがって本研究の目的はFunctional Reach Testが膝OA症例のQOLと関連するかを明らかにすることであった。

【方法】

対象は膝OAと診断された女性8名（69.4±7.4歳，152.4±7.8cm，57.5±19.9kg）であった。動作課題はFunctional Reach Testとし，動作計測にはカメラと三次元動作解析装置（Motion Analysis社製），床反力計（Kistler社製）を用いて行った。また反射マーカーを手関節中央部に貼付した。得られたデータからFunctional Reach Test時の前方へのリーチ距離と足圧中心（以下，COP）移動距離を算出した。QOLの評価には，日本版変形性膝関節症患者機能評価表（以下，JKOM）を用いた。合計点および各下位項目（膝の痛みの程度・膝の痛みとこわばり・日常生活動作の状態・ふだんの活動など・健康状態について）を計算した。統計にはSpearmanの順位相関係数を用いて，Functional Reach Test時の前方リーチ距離・前方COP移動距離と，JKOM合計点および各下位項目との相関を検討した。有意水準は5%未満とした。

【結果】

Functional Reach Test時の前方COP移動距離とJKOM合計点（R=-0.73，P=0.04），および下位項目である「膝の痛みとこわばり」（R=-0.75，P=0.03），「日常生活動作の状態」（R=-0.76，P=0.03）との間に有意な相関を認めた。前方リーチ距離では有意な関連を認めなかった。

【結論】

本研究はFunctional Reach Test時の前方COP移動距離の減少と，膝OA症例のQOL低下が関連することを明らかにした。QOL低下を認める膝OA症例では動的バランスが低下している可能性を示唆した結果と考えられる。近年，膝OA症例では転倒リスクが高いことが報告されており，膝OA症例のバランスに対する理学療法の重要性が示唆されている。本研究結果より，QOL改善の観点からも膝OA症例に対するバランスに対するアプローチが重要であると思われた。一方，臨床現場でしばしば使用されるFunctional Reach Test時の前方リーチ距離では有意な関連を認めなかった。膝OA症例のバランス評価においては前方COP移動距離の計測がより有用である可能性が考えられた。今後はさらに症例数を増やして検討を進めていきたい。

, (公社)日本理学療法士協会, 日本語

足部multi-segment modelを用いた歩行時の足部内側縦アーチの動的変化と足部kinematicsの相関性の検討
奥貫 拓実, 越野 裕太, 山中 正紀, 江沢 侑也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 25, 2, 232, 238, 2017年04月
(一社)日本臨床スポーツ医学会, 日本語

歩行中の外的膝内転モーメントと片脚立位移行動作での生体力学的指標との関連
千葉 健, 山中 正紀, 寒川 美奈, 齊藤 展士, 由利 真, 堀 弘明, 佐橋 健人, 遠山 晴一, 理学療法学, 44, Suppl.2, O, MT, 2017年04月

【はじめに，目的】

歩行中の大きな外的膝内転モーメント（KAM）が変形性膝関節症（KOA）の発症および進行に関連することが報告されている。我々は，臨床で一般的に用いられる片脚立位動作に着目し，本動作中のKAMおよび支持側方向への骨盤・体幹傾斜が歩行時のKAM最大値に関連することを報告してきた。しかしながら，これまでの報告は健常成人を対象にしておりKOA患者での検討が課題であった。したがって本研究の目的は，片脚立位動作における生体力学的指標が歩行時のKAMに与える影響をKOA患者で検討することとした。

【方法】

対象は，KOA患者7名（女性7名，68.3±7.3歳，152.4±8.4cm，57.7±18.1kg）とした。動作課題は自然歩行と片脚立位への移行動作（以下，片脚立位課題），自然立位とし，赤外線カメラ6台と床反力計2枚の同期により記録した。片脚立位課題の開始肢位は自然立位とし，音刺激後出来るだけ速く片脚立位になるよう指示した。解析区間は音刺激から足底離地後1秒までとした。体表マーカーはHelen Hayes Setを用い，第2胸椎棘突起を追加した。歩行課題と片脚立位課題でのKAM最大値，片脚立位課題での骨盤・体幹傾斜角度の最大値，膝関節レバーアーム長，自然立位での膝内転角度を算出し，骨盤・体幹傾斜は立脚側への傾斜を正とした。統計は，歩行中のKAM最大値とそれぞれ①片脚立位課題でのKAM最大値，②片脚立位課題での骨盤・体幹傾斜角度，③片脚立位課題での膝関節レバーアーム長，④自然立位での膝内転角度との相関をPearsonの積率相関係数を用いて検討した。有意水準は5％未満とした。

【結果】

歩行時KAM最大値と片脚立位課題でのKAM最大値（r=0.83，p＜0.05）および自然立位での膝内転角度（r=0.82，p＜0.05）と有意な相関を認めた。また，統計学的に有意では無かったが歩行時KAM最大値と片脚立位課題での膝関節レバーアーム長が中程度の相関を示した（r=0.55，p=0.20）。歩行時KAM最大値と片脚立位課題での骨盤・体幹傾斜角度との間に相関は認められなかった。

【結論】

本研究では健常成人を対象とした我々の先行研究と同様，両課題中のKAMが相関した。本研究結果は片脚立位課題が歩行中の生体力学的挙動を反映する動作課題であることを示唆した。一方で，片脚立位課題での骨盤・体幹傾斜角度は歩行時KAMと有意な相関を認めず，我々の先行研究と異なる結果を示した。KOA患者では膝内転角度が歩行時KAMに与える影響が大きかったためと思われた。また，本研究は歩行時KAMに片脚立位課題中の膝関節レバーアーム長が関連する可能性を示唆した。レバーアーム長には骨盤・体幹傾斜角度や膝内転角度，足圧中心の位置，股関節内転・内旋等が関連するといわれている。本研究課題のKOA患者への応用では，体幹・骨盤の運動学的挙動の他に，他の要因も考慮に入れた評価が必要であると思われた。今後は症例数を増やして検討を継続する必要がある。

, (公社)日本理学療法士協会, 日本語

体幹回旋を伴う上肢運動時の体幹ローカル筋筋活動onsetの検討
大須賀 聡, 山中 正紀, 三浦 拓也, 齋藤 優輝, 上野 亮, 寒川 美奈, 齊藤 展士, 遠山 晴一, 理学療法学, 44, Suppl.2, P, MT, 2017年04月

【はじめに，目的】

体幹ローカル筋群に含まれる腹横筋や内腹斜筋は，体幹回旋を伴う上肢運動課題にて主動作筋よりも早期に筋活動を開始し腰仙部の安定性に貢献すると報告されているが，近年体幹回旋を伴わない上肢運動課題においては筋活動開始時点（onset）が主動作筋よりも遅延することが示された。このことから体幹回旋と体幹ローカル筋群のonsetは関連していることが推察されるが，この関連について検討した先行研究は少なく一致した見解は得られていない。よって，本研究の目的は体幹回旋を伴う異なる上肢運動時の体幹ローカル筋onsetについて調査することとした。

【方法】

対象は健常男女13名（21.4±1.5歳，167.2±9.6 cm，57.5±9.3 kg）とした。筋活動の測定にはワイヤレス表面筋電計（日本光電社製）をサンプリング周波数1000 Hzで使用し，対象筋は両側の三角筋前部線維，内腹斜筋-腹横筋重層部（IO-TrA）とした。動作課題は以下の7つとした；体幹右回旋を伴う課題として①右側肩関節屈曲運動，②右側肩関節屈曲+左側肩関節伸展運動，③両手に1 kgの重錘を把持した右側肩関節屈曲運動＋左側肩関節伸展運動，体幹左回旋を伴う課題として④左側肩関節屈曲運動，⑤左側肩関節屈曲+右側肩関節伸展運動，⑥両手に1 kgの重錘を把持した左側肩関節屈曲+右側肩関節伸展運動，さらに非体幹回旋課題として⑦両側肩関節屈曲運動を行った。各課題を聴覚刺激後，最大速度にて5試行実施した。onsetはベースラインの筋活動を1SD上回り50 msec持続した始めの時点とし，三角筋前部線維のonsetからIO-TrAのonsetを特定した。統計解析は課題間での比較に反復測定一元配置分散分析を使用し，post-hoc testにはTukey法を用いた。統計学的有意水準は5%とした。

【結果】

左側のIO-TrAのonsetは，体幹右回旋を伴う課題（動作課題①，②，③）において早期に生じた（p＜0.05）。対照的に，右側のIO-TrAのonsetは，体幹左回旋を伴う課題（動作課題④，⑤，⑥）において早期に生じた（p＜0.05）。しかし同方向の体幹回旋を伴う課題間にて有意差は認められなかった。

【結論】

本結果より，体幹回旋方向とは逆側のIO-TrAのonsetが他の課題におけるonsetよりも早期に生じることが示された。これは，回旋方向とは逆側のIO-TrAの筋活動を早期に開始することで腰仙部の安定性を獲得し，より安全な課題遂行に寄与した結果であるかもしれない。また本結果では同方向の体幹回旋を伴う課題間にて有意差は認められなかった。本研究において体幹回旋モーメントの算出はしていないが，先行研究により本研究で用いた課題間で体幹回旋モーメントが異なることが報告されていることから，IO-TrAのonsetは体幹回旋モーメントに依存しない可能性が考えられる。したがって，IO-TrAのonsetは体幹回旋方向に影響され，体幹回旋モーメントとは関連しないのかもしれない。

, (公社)日本理学療法士協会, 日本語

スポーツ障害に対する保存的治療のエビデンス 膝オーバーユース障害に対する保存的治療のエビデンス　　　　　　　　　　　　　　　
遠山 晴一, 越野 裕太, 寒川 美奈, 山中 正紀, 日本整形外科学会雑誌, 91, 2, S436, S436, 2017年03月
(公社)日本整形外科学会, 日本語

冬期における豪雪地域住民の年代別体組成および骨密度の実態 高齢者の筋肉量と骨密度に着目して　　　　　　　　　　　　　　　
下田 智子, 鈴木 哲平, 堤 香織, 高橋 紀子, 寒川 美奈, 後藤 輝明, 吉町 昌子, 小笠原 克彦, 良村 貞子, 日本未病システム学会学術総会抄録集, 23回, 125, 125, 2016年10月
(一社)日本未病学会, 日本語

リオデジャネイロ・オリンピックのメディカルサポート リオ・オリンピック日本代表選手団の医学サポート
中嶋 耕平, 土肥 美智子, 中山 修一, 真鍋 知宏, 鈴木 岳, 寒川 美奈, 日本臨床スポーツ医学会誌, 24, 4, S126, S126, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

二次元画像を用いた脊柱アライメント評価法の妥当性検証
石田 優子, 寒川 美奈, 谷 祐児, 堤 香織, 大場 健裕, 鶴喰 涼, 三上 兼太朗, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 24, 4, S312, S312, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

ハムストリングスの柔軟性がSit and reachテスト時の骨盤傾斜および脊柱可動性に与える影響
石田 優子, 寒川 美奈, 大場 健裕, 鶴喰 涼, 山口 瑞輝, 横山 美翔, 齊藤 展士, 山中 正紀, 遠山 晴一, 理学療法学, 43, Suppl.2, P, SP, 2016年10月
【はじめに，目的】腰痛は日本人の約12%で罹患している（Yoshimura, 2014）。腰痛発生への関連因子として，ハムストリングス短縮（Adams，1999），骨盤傾斜の増加（Min，2013），腹筋群筋力低下（Nourbakhsh, 2002）などが挙げられている。一方腰痛患者を対象とした研究では，腰椎可動性の減少を示した報告はあるものの，ハムストリングス柔軟性や骨盤傾斜角度との関連性はまだ調べられていない。本研究は，ハムストリングス柔軟性の違いがSit and reachテスト時における骨盤傾斜および脊柱可動性へ与える影響を検討した。【方法】対象は，腰背部および下肢に整形外科的・神経学的疾患のない健常若年男性30名（年齢21.8±2.0歳，身長172.5±5.3cm）とした。ハムストリングス柔軟性はStraight leg raise（SLR）で調べ，被験者をLow SLR群（LS群）とHigh SLR群（HS群）に分けた。Sit and reachテストは，長座体前屈測定器（TOEILIGHT製）を用いて最大到達距離を測定した。胸椎・腰椎可動性と骨盤傾斜は，反射マーカーを第1胸椎棘突起（Th1），第1腰椎棘突起（L1），第1仙椎棘突起（S1），上前腸骨棘（ASIS），上後腸骨棘（PSIS）に貼付し（Vismarara，2010），デジタルカメラ（OLYMPUSμ-7020）で開始肢位と最大前屈位を撮影後，解析ソフトウェアImage J（NIH製）にて各角度を計測した。胸椎角はTh1-L1とL1-S1，腰椎角はL1-S1とASIS-PSIS，骨盤傾斜をASIS-PSISと水平線のそれぞれ成す角と定義し，開始肢位と最大前屈位での変化量を算出した。統計処理にはLeveneの検定を用い，胸椎・腰椎角および骨盤傾斜変化量の群間差を検討した。有意水準はp＜0.05とした。【結果】SLR値は，LS群57.9±3.6°，HS群80.9±7.0°と両群間で差を認めた（p＜0.001）。Sit and reachテスト時の腰椎角変化量は，LS群8.5±2.9°，HS群17.5±6.0°，骨盤傾斜変化量については，LS群11.9±4.4°，HS群20.2±4.2°と，HS群で有意に増大していた（ともにp＜0.001）。胸椎角変化量については，LS群26.9±16.0°，HS群20.7±5.9°と差は認められなかった（p=0.168）。【結論】本研究結果より，ハムストリングス柔軟性とSit and reachテスト時における腰椎角および骨盤傾斜変化量で関係性が示された。一方で，胸椎角においては関係性を認めなかった。前屈動作時の脊柱可動性や骨盤傾斜評価の際には，ハムストリングス柔軟性に影響を受ける可能性を示唆する結果であった。, (公社)日本理学療法士協会, 日本語

超音波画像診断装置を用いたドローインと腹臥位腰部セッティングの体幹筋筋厚変化率の比較
齋藤 優輝, 山中 正紀, 井野 拓実, 片岡 義明, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 24, 4, S238, S238, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

収縮様式および角速度が膝関節屈曲トルク-角度特性に与える効果
三上 兼太朗, 寒川 美奈, 山中 正紀, 遠山 晴一, 伊藤 雄, 石田 知也, 大場 健裕, 石田 優子, 鶴喰 涼, 松本 尚, 青木 喜満, 日本臨床スポーツ医学会誌, 24, 4, S249, S249, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

後足部と膝および股関節で生じるcoupling motionの検討 動作および関節による比較
越野 裕太, 山中 正紀, 江沢 侑也, 奥貫 拓実, 石田 知也, 寒川 美奈, 井上 雅之, 遠山 晴一, 日本臨床スポーツ医学会誌, 24, 4, S258, S258, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

Medial tibial stress syndrome症例におけるトレッドミル走行時の膝および股関節運動に対する前・後足部運動の比較
奥貫 拓実, 越野 裕太, 遠山 晴一, 堤 香織, 五十嵐 將斗, 江沢 侑也, 寒川 美奈, 山中 正紀, 日本臨床スポーツ医学会誌, 24, 4, S315, S315, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

膝屈曲位における足部回内が下腿・大腿へ及ぼす影響
千田 周也, 越野 裕太, 遠山 晴一, 五十嵐 將斗, 奥貫 拓実, 佐藤 冴香, 寒川 美奈, 山中 正紀, 日本臨床スポーツ医学会誌, 24, 4, S320, S320, 2016年10月
(一社)日本臨床スポーツ医学会, 日本語

足関節底屈筋筋腱複合体スティフネスとストレッチング効果の関連性について
大場 健裕, 寒川 美奈, 石田 優子, 鶴喰 涼, 鈴森 雄貴, 三上 兼太郎, 山口 瑞樹, 横山 美翔, 齊藤 展士, 山中 正紀, 遠山 晴一, 理学療法学, 43, Suppl.2, O, KS, 2016年10月
【はじめに，目的】ストレッチングは，柔軟性改善を目的として臨床でよく行われている。近年，ストレッチングの効果検証には粘弾性の評価指標である筋腱複合体スティフネス（Musculotendinous stiffness：以下MTS）が用いられ，ストレッチング後のMTS低下や，MTSと指床間距離（FFD）など柔軟性評価指標との関連性が示されている。一方で，ストレッチング実施前のMTS値がストレッチング効果に異なる影響を与えるのではないかと考えられるが，MTSとストレッチング介入効果の関連性についてはあまりまだ検証されていない。そこで本研究は，足関節底屈筋筋腱複合体スティフネスとストレッチング効果との関連性を検証した。【方法】対象は整形外科的，神経学的疾患のない健常男子学生12名（年齢22.1±0.8歳）とし，対象筋は右足関節底屈筋とした。ROM，MTS計測は等速度性筋力測定機器（Biodex system 3）を用い，測定肢位は背臥位，膝関節完全伸展位とした。ストレッチング介入48時間前に底屈10 degから5 deg/secで最大背屈させ受動トルク，背屈ROMを測定し，ストレッチング介入の条件設定に用いた。介入直前，介入直後にも同様の測定を行い，前後のMTS，ROM増加率を算出した。MTSは，トルク-角度曲線における最終背屈角度から50%の角度での直線の傾きと定義した。ストレッチングは，事前に測定したROMの90%でのトルク値を用いて30秒×4セット合計2分，セット間は20秒間の休息とした。統計学的処理は，介入前後でのROM，MTSについて対応ありのt検定，MTSとROM増加率に対してピアソンの積率相関係数を算出した。有意水準は0.05未満とした。【結果】ストレッチング前後でのROMは，介入前32.9±6.1 deg，介入後37.2±6.2 degと有意な増加を認めた（p＜0.05）。MTSは，介入前1.8±0.6 Nm/deg，介入後1.5±0.6 Nm/degで有意に低下した（p＜0.05）。また，介入前のMTS値とROM増加率においては有意な負の相関が認められた（r=-0.75，p＜0.05）。【結論】本研究結果より，2分間の足関節底屈筋へのストレッチングは，ROM増加とMTSを低下させたことから，柔軟性改善効果を示した。また，介入前のMTSが低値であるほどROM増加率も高かったこと，MTS高値群と低値群では伸張時の筋腱動態が異なる報告もみられることから，介入前のMTS値はストレッチング効果に影響を及ぼし得る因子であると考えられた。今後，柔軟性改善の持続効果や，ストレッチング時間を変更した際の柔軟性改善効果を合わせて検討していく必要があると思われた。, (公社)日本理学療法士協会, 日本語

下腿側方傾斜角度を用いたdrop vertical jump着地時の膝関節外反角度の評価の試み
馬場 周, 山中 正紀, 石田 知也, 谷口 翔平, 上野 亮, 生田 亮平, 齊藤 展士, 寒川 美奈, 遠山 晴一, 理学療法学, 43, Suppl.2, O, SP, 2016年10月
【はじめに，目的】Hewettら（2005）は三次元動作解析を用いてdrop vertical jump（DVJ）課題における最大膝外反角度が膝前十字靱帯（ACL）損傷の予測因子の一つであることを明らかにした。しかし，三次元動作解析は高価な計測装置を必要とし，計測や解析に長時間を要するため，スポーツ現場におけるスクリーニングとしての実用性は低い。Miznerら（2012）はデジタルビデオカメラを用いた二次元的評価を行い，両膝関節間距離を両足関節間距離で除した膝関節足関節距離比率（膝足比率）が三次元動作解析により算出した膝外反角度と有意に相関し，簡易的評価法として有用であると報告した。そこで我々は前額面上で下腿軸と鉛直線が成す角度（下腿側方傾斜角度）は，膝足比率と同様に膝関節と足関節の位置関係を反映し，さらに膝足比率と異なり片脚ごとの評価が可能であるため，新たな評価指標の一つとなり得ると考えた。したがって本研究の目的は，DVJにおける下腿側方傾斜角度と三次元動作解析により算出した膝外反角度の相関関係を検討することとした。【方法】健常女性13名（年齢21.0±1.0歳，身長158.0±7.0cm，体重53.6±5.6kg）を対象とした。動作課題は30cm台から着地後直ちに最大垂直跳びを行うDVJとし，三次元動作解析装置（Motion Analysis社製），赤外線カメラ6台（Motion Analysis社製，200Hz），反射マーカー39個，デジタルビデオカメラ1台（SONY社製，30Hz）を用いて記録した。SIMM6.0.2（MusculoGraphics社製）を用いて各試行における三次元膝外反角度を算出した。またデジタルビデオカメラを用いた前額面上の二次元的評価として，膝最大屈曲時の画像を抽出し，膝足比率，下腿側方傾斜角度をImage J（National Institute of Health製）を用いて算出した。三次元膝外反角度および各二次元的評価指標は静的立位時の値を中間位とした。Pearsonの積率相関係数を用いて，膝最大屈曲時の三次元膝外反角度と各二次元的評価指標の相関関係を検討した。また，各二次元的評価指標に関しては級内相関係数を用いて検者内，検者間信頼性を検討した。統計学的解析は全てPASW Statistics 18.0（SPSS Inc.）を用い，有意水準は5%未満とした。【結果】下腿側方傾斜角度，膝足比率の検者内信頼性ICC（1,1）はそれぞれ0.971，0.952，検者間信頼性ICC（2,1）は0.937，0.924であった。三次元膝外反角度と下腿側方傾斜角度（R=0.57，P=0.043），および膝足比率（R=0.57，P=0.039）との間に有意な正の相関を認めた。【結論】下腿側方傾斜角度と三次元膝外反角度との間には，膝足比率と同程度の相関関係を認めた。下腿側方傾斜角度は片脚ごとの評価が可能であり，計測，解析も簡便なため，DVJにおける膝外反角度の新たな簡易的評価法として有用であると考えられた。今後は前向き研究などにより，この指標が実際にACL損傷スクリーニングとして有用か検討する必要がある。, (公社)日本理学療法士協会, 日本語

Medial tibial stress syndrome症例における走行時の後・前足部kinematicsおよび内側縦アーチの動態の検討
奥貫 拓実, 越野 裕太, 遠山 晴一, 堤 香織, 生田 亮平, 佐橋 健人, 横山 美翔, 江沢 侑也, 寒川 美奈, 齊藤 展士, 山中 正紀, 理学療法学, 43, Suppl.2, O, SP, 2016年10月
【はじめに，目的】Medial tibial stress syndrome（MTSS）は運動時に脛骨後内側縁に疼痛が発生する症状とされ，ランニング障害の13～17%を占める下肢オーバーユース障害である。MTSSの危険因子として，荷重動作時の内側縦アーチ低下や後足部外反角度増大が報告されている。荷重動作時の内側縦アーチ低下や後足部運動は，前足部運動と関連することが知られているが，MTSS症例において前足部や内側縦アーチを含めた走行時の足部kinematicsは明らかではない。本研究の目的は，multi-segment foot modelを用いて，MTSS症例におけるトレッドミル走行時の後足部，前足部および内側縦アーチの動態の特徴を検討することとした。【方法】対象は，MTSS症例群11名（男性10名，女性1名，年齢：20.5±1.5歳，BMI：22.0±2.0kg/m²）および健常群11名（男性10名，女性1名，年齢：20.5±1.4歳，BMI：19.7±1.3 kg/m²）とした。MTSSの定義はYatesら（2004）の基準に従い，1）脛骨後内側縁の圧痛がある，2）圧痛部位が5cm以上である，3）X線画像上で脛骨疲労骨折の所見がない，こととした。Leardiniら（2007）のmulti-segment foot modelに準じて下腿と足部に反射マーカーを16個貼付し，赤外線カメラ6台（Motion Analysis社製：200 Hz）を用いて，裸足によるトレッドミル走行（12km/h）の5ストライドを記録・解析した。解析にはVisual 3D（C-motion社製）を用いて，下腿に対する後足部内外反・内外転，後足部に対する前足部内外反・内外転・底背屈および内側縦アーチ角（第1中足骨頭，舟状骨，踵骨下部のマーカーから成る角）を算出した。立脚相を100%に正規化し，対応のないt-検定を用いて各kinematicsを群間で比較した。有意水準はp＜0.05とした。【結果】MTSS症例群は健常群に比し，立脚相3～14%の区間で有意に後足部外反が大きく，立脚相0～28%および55～100%の2つの区間で有意に後足部外転が大きかった（p＜0.05）。さらに，MTSS症例群は立脚相21～35%の区間において健常群に比し，有意に前足部外転が大きかった（p＜0.05）。一方で，前足部内外反・底背屈および内側縦アーチ角では群間で差は認められなかった。【結論】本研究結果は，走行立脚相においてMTSS症例は後足部外反・外転および前足部外転が健常者に比べ，有意に大きいことを示した。したがって，MTSS症例では，後足部外反および外転の増大により足部内返し筋がより伸長された状態で遠心性収縮を要求され，脛骨後内側縁に牽引ストレスが生じる可能性がある。加えて，前足部外転および後足部外転の増大は，下腿に対し足部をより外側に向けた状態であることを示唆し，これは走行時の荷重応答および踏み切りに伴う足部内転フリーモーメントの発生に寄与し，脛骨に回旋ストレスが加わる可能性がある。したがって，MTSS症例に対する理学療法実施の際には，後足部だけでなく前足部運動にも着目する必要があることを示唆した。, (公社)日本理学療法士協会, 日本語

歩行時の前足部、後足部、下腿と股関節のcoupling motionの検討
越野 裕太, 山中 正紀, 奥貫 拓実, 江沢 侑也, 石田 知也, 寒川 美奈, 遠山 晴一, 理学療法学, 43, Suppl.2, O, SP, 2016年10月
【はじめに，目的】足部運動は下腿および大腿の運動に影響を与え，これは様々な下肢スポーツ傷害発生メカニズムに関与すると考えられている。歩行時の後足部外反運動と股関節の内旋または内転運動は相関関係にあり，coupling motionであることが知られている。近年，後足部だけでなく，前足部も股関節の動態に影響を与えることは示唆されているが，前足部を含めた足部と股関節運動との関係は明らかではない。本研究の目的は，multi-segment foot modelを用いて前足部，後足部，下腿および股関節における歩行中の経時的なkinematicsの関係を検討することとした。【方法】対象は下肢や体幹に既往歴のない健常者18名とし（男性9名，女性9名，年齢21.9±1.2歳，身長167.0±9.0 cm，体重57.7±7.1 kg），全例利き脚である右脚を検査対象とした。Helen Hayes法に準じて骨盤および下肢に反射マーカーを貼付し，さらにLeardiniら（2007）のmulti-segment foot modelに準じた下腿と足部の反射マーカーを追加し，計24個貼付した。被験者には裸足での自然歩行を行わせ，赤外線カメラ6台（Motion Analysis社製：200 Hz）と床反力計（Kistler社製：1000 Hz）を用いて成功3試行を記録した。Visual 3D（C-motion社製）を用いて，立脚相の股関節内転・内旋，後足部に対する下腿内旋，下腿に対する後足部外反，後足部に対する前足部外反・外転，内側縦アーチ角（角度の増大は扁平化を示す）を算出した。股関節内旋・内転角度と，下腿・足部・内側縦アーチの角度の経時的な関係に関して，相互相関解析を行った。相互相関解析は2つの経時的な角度データの関係性を評価し，相関係数が正の場合は同様の運動パターンであることを示唆し，負の場合は一方の経時的角度データが増加するともう一方は減少する逆の運動パターンであることを示唆する。相互相関解析は各被験者の1試行ごと行い，全被験者における相互相関係数の平均値±95％信頼区間を算出した。【結果】後足部に対する下腿内旋，後足部外反，前足部外転，内側縦アーチ角は股関節内転との間に中等度以上の正の相関を認めた（下腿内旋：R＝0.76±0.08，後足部外反：R＝0.55±0.11，前足部外転：R＝0.67±0.09，内側縦アーチ角：R＝0.51±0.10）。これに比し，足部kinematicsと股関節内旋との相関は全て弱い値であった。【結論】本研究結果から，下腿内旋，後足部外反，内側縦アーチ扁平化だけでなく，前足部外転とも歩行時の股関節内転との間に高い相関性を認め，類似したパターンで運動していることが明らかとなった。これは従来考えられている足部回内と下腿内旋が股関節運動に影響を及ぼすという理論を支持するものであり，さらに前足部運動も股関節運動に関係していることが示唆された。したがって，下肢スポーツ傷害の予防において，後足部，内側縦アーチ，下腿だけでなく前足部を含めた動作の評価が必要であると考えられた。, (公社)日本理学療法士協会, 日本語

足関節底屈筋筋腱複合体スティフネスとストレッチング効果の関連性について
大場 健裕, 寒川 美奈, 石田 優子, 鶴喰 涼, 鈴森 雄貴, 三上 兼太郎, 山口 瑞樹, 横山 美翔, 齊藤 展士, 山中 正紀, 遠山 晴一, 日本基礎理学療法学雑誌, 20, 1, 21, 21, 2016年08月
【はじめに，目的】ストレッチングは，柔軟性改善を目的として臨床でよく行われている。近年，ストレッチングの効果検証には粘弾性の評価指標である筋腱複合体スティフネス（Musculotendinous stiffness：以下MTS）が用いられ，ストレッチング後のMTS低下や，MTSと指床間距離（FFD）など柔軟性評価指標との関連性が示されている。一方で，ストレッチング実施前のMTS値がストレッチング効果に異なる影響を与えるのではないかと考えられるが，MTSとストレッチング介入効果の関連性についてはあまりまだ検証されていない。そこで本研究は，足関節底屈筋筋腱複合体スティフネスとストレッチング効果との関連性を検証した。【方法】対象は整形外科的，神経学的疾患のない健常男子学生12名（年齢22.1±0.8歳）とし，対象筋は右足関節底屈筋とした。ROM，MTS計測は等速度性筋力測定機器（Biodex system 3）を用い，測定肢位は背臥位，膝関節完全伸展位とした。ストレッチング介入48時間前に底屈10 degから5 deg/secで最大背屈させ受動トルク，背屈ROMを測定し，ストレッチング介入の条件設定に用いた。介入直前，介入直後にも同様の測定を行い，前後のMTS，ROM増加率を算出した。MTSは，トルク-角度曲線における最終背屈角度から50%の角度での直線の傾きと定義した。ストレッチングは，事前に測定したROMの90%でのトルク値を用いて30秒×4セット合計2分，セット間は20秒間の休息とした。統計学的処理は，介入前後でのROM，MTSについて対応ありのt検定，MTSとROM増加率に対してピアソンの積率相関係数を算出した。有意水準は0.05未満とした。【結果】ストレッチング前後でのROMは，介入前32.9±6.1 deg，介入後37.2±6.2 degと有意な増加を認めた（p＜0.05）。MTSは，介入前1.8±0.6 Nm/deg，介入後1.5±0.6 Nm/degで有意に低下した（p＜0.05）。また，介入前のMTS値とROM増加率においては有意な負の相関が認められた（r=-0.75，p＜0.05）。【結論】本研究結果より，2分間の足関節底屈筋へのストレッチングは，ROM増加とMTSを低下させたことから，柔軟性改善効果を示した。また，介入前のMTSが低値であるほどROM増加率も高かったこと，MTS高値群と低値群では伸張時の筋腱動態が異なる報告もみられることから，介入前のMTS値はストレッチング効果に影響を及ぼし得る因子であると考えられた。今後，柔軟性改善の持続効果や，ストレッチング時間を変更した際の柔軟性改善効果を合わせて検討していく必要があると思われた。, 日本基礎理学療法学会学術誌局, 日本語

コンスタントトルクストレッチングがハムストリングス筋腱複合体の力学的特性に及ぼす影響
大場 健裕, 寒川 美奈, 鶴喰 涼, 石田 優子, 山口 瑞輝, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S221, S221, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

ウォームアップの種類による大腿四頭筋の筋温の経時的変化の違い
鶴喰 涼, 寒川 美奈, 石田 優子, 大場 健裕, 山口 瑞輝, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S165, S165, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

Sit and Reach testの有効性とStraight leg raise testとの関連性について
石田 優子, 寒川 美奈, 大場 健裕, 鶴喰 涼, 山口 瑞輝, 横山 美翔, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S235, S235, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

Drop vertical jumpにおける着地後早期の膝関節外反増加量は着地動作中の膝関節最大外反モーメントと相関する　　　　　　　　　　　　　　　
生田 亮平, 石田 知也, 山中 正紀, 谷口 翔平, 上野 亮, 越野 裕太, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S185, S185, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

片脚スクワット動作における足部kinematicsと股関節kinematicsの相互相関の検討
越野 裕太, 山中 正紀, 江沢 侑也, 奥貫 拓実, 石田 知也, 寒川 美奈, 井上 雅之, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S245, S245, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

裸足走行時のfoot strike patternが内側縦アーチの動態に与える影響の検討
五十嵐 将斗, 山中 正紀, 越野 裕太, 奥貫 拓実, 江沢 侑也, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S272, S272, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

Medial tibial stress syndrome症例におけるトレッドミル走行時の足部kinematicsの特徴(第1報)
奥貫 拓実, 山中 正紀, 越野 裕太, 五十嵐 将斗, 江沢 侑也, 寒川 美奈, 堤 香織, 遠山 晴一, 日本臨床スポーツ医学会誌, 23, 4, S273, S273, 2015年10月
(一社)日本臨床スポーツ医学会, 日本語

ストレッチング運動で健康な身体づくり　　　　　　　　　　　　　　　
寒川 美奈, 日本未病システム学会学術総会抄録集, 22回, 108, 108, 2015年09月
(一社)日本未病学会, 日本語

地域在住高齢者における尿失禁の実態調査　　　　　　　　　　　　　　　
寒川 美奈, 磯貝 紗織, 日本未病システム学会学術総会抄録集, 22回, 130, 130, 2015年09月
(一社)日本未病学会, 日本語

特別豪雪地帯に住む高齢者の積雪時および非積雪時の活動量と体組成の実態調査　　　　　　　　　　　　　　　
下田 智子, 寒川 美奈, 小笠原 克彦, 良村 貞子, 日本未病システム学会学術総会抄録集, 22回, 131, 131, 2015年09月
(一社)日本未病学会, 日本語

腹横筋と腰部多裂筋の形態学的関連性
三浦 拓也, 山中 正紀, 森井 康博, 寒川 美奈, 齊藤 展士, 小林 巧, 井野 拓実, 遠山 晴一, 理学療法学, 42, Suppl.2, O, 0511, 2015年04月
(公社)日本理学療法士協会, 日本語

テロスストレス装置を用いたX線足関節前方引き出しテストにおける性差の検討
横山 美翔, 寒川 美奈, 堤 香織, 田中 茉衣, 遠山 晴一, 理学療法学, 42, Suppl.2, P1, B, 2015年04月
(公社)日本理学療法士協会, 日本語

ダイナミックストレッチングの基礎と効果．　　　　　　　　　　　　　　　
寒川 美奈, 臨床スポーツ医学, 325, 452, 455, 2015年

スキー選手のACL再建術後リハビリテーションと競技復帰 (特集 競技特性からみた前十字靱帯損傷 : 競技復帰に向けたアプローチ)
寒川 美奈, 臨床スポーツ医学, 31, 11, 1088, 1091, 2014年11月
文光堂, 日本語

大学陸上競技選手へのコンディショニングチェック 柔軟性、垂直跳び高と障害状況の関連
三上 兼太朗, 大角 侑平, 伊藤 雄, 中田 周兵, 寒川 美奈, 石田 知也, 松本 尚, 青木 喜満, 日本臨床スポーツ医学会誌, 22, 4, S184, S184, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

スタティックストレッチングが筋腱複合体伸張性に与える効果に関する性差の検討　　　　　　　　　　　　　　　
横山 美翔, 寒川 美奈, 牟田 奈央, 宮部 瑤子, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S159, S159, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

Drop Vertical Jumpにおける着地動作時の股関節内旋が膝関節外反に与える影響　　　　　　　　　　　　　　　
石田 知也, 山中 正紀, 谷口 翔平, 越野 裕太, 寒川 美奈, 松本 尚, 青木 喜満, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S124, S124, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

ウォーミングアップがダイナミックストレッチングの筋硬度に対する効果に与える影響　　　　　　　　　　　　　　　
寒川 美奈, 宮部 瑤子, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S160, S160, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

骨盤傾斜が骨盤底筋収縮時の骨盤底挙上へ与える影響　　　　　　　　　　　　　　　
牟田 奈央, 寒川 美奈, 横山 美翔, 宮部 瑤子, 山中 正紀, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S209, S209, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

立位姿勢が骨盤底筋収縮時の骨盤底挙上量へ与える影響　　　　　　　　　　　　　　　
宮部 瑤子, 寒川 美奈, 横山 美翔, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S209, S209, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性足関節不安定性症例における機能的不安定性の重症度が片脚ジャンプ着地時の足関節キネマティクスに与える影響　　　　　　　　　　　　　　　
越野 裕太, 山中 正紀, 江沢 侑也, 石田 知也, 寒川 美奈, 井上 雅之, 遠山 晴一, 日本臨床スポーツ医学会誌, 22, 4, S216, S216, 2014年10月
(一社)日本臨床スポーツ医学会, 日本語

着地後ジャンプ動作の有無が着地時の下肢関節運動に与える効果　　　　　　　　　　　　　　　
石田 知也, 山中 正紀, 谷口 翔平, 越野 裕太, 寒川 美奈, 齊藤 展士, 小林 巧, 松本 尚, 青木 喜満, 遠山 晴一, 日本整形外科スポーツ医学会雑誌, 34, 4, 552, 552, 2014年08月
(一社)日本整形外科スポーツ医学会, 日本語

大学陸上競技選手の身体的特徴 短距離選手と中長距離選手の比較　　　　　　　　　　　　　　　
三上 兼太朗, 益田 洋史, 大角 侑平, 伊藤 雄, 中田 周兵, 中村 実弓, 松本 尚, 寒川 美奈, 青木 喜満, JOSKAS, 39, 4, 501, 501, 2014年07月
(一社)日本関節鏡・膝・スポーツ整形外科学会, 日本語

Drop vertical jump着地後早期における膝関節外反運動の変化量の検討　　　　　　　　　　　　　　　
石田 知也, 山中 正紀, 谷口 翔平, 越野 裕太, 寒川 美奈, 齊藤 展士, 小林 巧, 松本 尚, 青木 喜満, 遠山 晴一, JOSKAS, 39, 4, 411, 411, 2014年07月
(一社)日本関節鏡・膝・スポーツ整形外科学会, 日本語

変形性股関節症患者の健康関連QOLと性格特性の関連
栗原 元子, 寒川 美奈, 菅野 宏介, 奥秋 保, 理学療法学, 41, 大会特別号2, 0377, 0377, 2014年05月
(一社)日本理学療法学会連合, 日本語

健常者における異なる座位姿勢時の胸椎矢状面アライメントと腹横筋筋厚の関係
森井 康博, 山中 正紀, 三浦 拓也, 斎藤 展士, 寒川 美奈, 小林 巧, 理学療法学, 41, 大会特別号2, 0431, 0431, 2014年05月
(一社)日本理学療法学会連合, 日本語

一般大学陸上競技選手に対するコンディショニングチェック 傷害実態とパフォーマンス、柔軟性の検討
三上 兼太朗, 益田 洋史, 大角 侑平, 中田 周兵, 中村 実弓, 松本 尚, 寒川 美奈, 青木 喜満, 理学療法学, 41, 大会特別号2, 1578, 1578, 2014年05月
(一社)日本理学療法学会連合, 日本語

着地後早期の膝関節外反、内旋運動と下肢関節運動の関係
石田 知也, 山中 正紀, 谷口 翔平, 宝満 健太郎, 越野 裕太, 寒川 美奈, 齊藤 展士, 小林 巧, 青木 喜満, 遠山 晴一, 理学療法学, 41, 大会特別号2, 0439, 0439, 2014年05月
(公社)日本理学療法士協会, 日本語

体幹深層筋群の活性化は体幹表層筋群の活動性を減少させるか 慢性腰痛症例での検討
三浦 拓也, 山中 正紀, 齊藤 展士, 寒川 美奈, 小林 巧, 森井 康博, 遠山 晴一, 理学療法学, 41, 大会特別号2, 1255, 1255, 2014年05月
(公社)日本理学療法士協会, 日本語

Star Excursion Balance Testリーチ時の下肢関節角度、内的モーメントとリーチ距離との関係 前方、後内側、後外側方向の検討
谷口 翔平, 山中 正紀, 石田 知也, 越野 裕太, 江沢 侑也, 生田 亮平, 寒川 美奈, 齊藤 展士, 小林 巧, 遠山 晴一, 理学療法学, 41, 大会特別号2, 1465, 1465, 2014年05月
(公社)日本理学療法士協会, 日本語

慢性足関節不安定性症例における片脚着地動作時の下肢関節運動パターン 主成分分析を用いた検討
越野 裕太, 山中 正紀, 江沢 侑也, 石田 知也, 小林 巧, 寒川 美奈, 齊藤 展士, 遠山 晴一, 理学療法学, 41, 大会特別号2, 1496, 1496, 2014年05月
(公社)日本理学療法士協会, 日本語

体幹の回旋運動に対する腹横筋の寄与 健常者と慢性腰痛症例の比較
三浦 拓也, 山中 正紀, 遠山 晴一, 斎藤 展士, 寒川 美奈, 小林 巧, 武田 直樹, 理学療法科学, 29, 2, 207, 212, 2014年04月
(一社)理学療法科学学会, 日本語

【競技復帰を目指した膝関節の術後トレーニング】 ACL再建術後のリハビリテーションと注意点
寒川 美奈, 遠山 晴一, 臨床スポーツ医学, 31, 2, 106, 109, 2014年02月
(株)文光堂, 日本語

ウォームアップにおける筋温上昇および血流動態とその経時的変化　　　　　　　　　　　　　　　
釘本 真幸, 長山 唯, 細川 来実, 山崎 肇, 寒川 美奈, 体力科学, 62, 6, 523, 523, 2013年12月
(一社)日本体力医学会, 日本語

ウォームアップ方法の違いが腓腹筋筋腱複合体スティフネスに与える影響　　　　　　　　　　　　　　　
長山 唯, 釘本 真幸, 細川 来実, 寒川 美奈, 体力科学, 62, 6, 549, 549, 2013年12月
(一社)日本体力医学会, 日本語

ダイナミックストレッチングが腱スティフネスに与える変化　　　　　　　　　　　　　　　
三上 兼太朗, 三森 由麻, 寒川 美奈, 体力科学, 62, 6, 549, 549, 2013年12月
(一社)日本体力医学会, 日本語

ダイナミックストレッチング、バリスティックストレッチングが関節可動域およびスティフネスに与える影響　　　　　　　　　　　　　　　
細川 来実, 釘本 真幸, 長山 唯, 山崎 肇, 寒川 美奈, 体力科学, 62, 6, 550, 550, 2013年12月
(一社)日本体力医学会, 日本語

膝関節運動に対する動作課題と性の影響 第二報 ―Drop Vertical Jump，Drop Landing，垂直跳びの比較―　　　　　　　　　　　　　　　
石田知也, 山中正紀, 谷口翔平, 越野裕太, 遠山晴一, 寒川美奈, 齊藤展士, 小林巧, 宝満健太郎, 松本尚, 青木喜満, 第40回日本臨床バイオメカニクス学会, 2013年11月

Drop Vertical Jumpにおける膝関節運動の特徴 第3報 ―Drop landing, 垂直跳びとの比較―
石田知也, 山中正紀, 谷口翔平, 越野裕太, 遠山晴一, 寒川美奈, 宝満健太郎, 松本尚, 青木喜満, 第24回日本臨床スポーツ医学会学術集会, 21, 4, 2013年10月
日本語

慢性足関節不安定性症例の歩行時における下肢筋活動の主成分分析を用いた検討　　　　　　　　　　　　　　　
越野 裕太, 山中 正紀, 江沢 侑也, 石田 知也, 寒川 美奈, 井上 雅之, 遠山 晴一, 日本臨床スポーツ医学会誌, 21, 4, S176, S176, 2013年10月
(一社)日本臨床スポーツ医学会, 日本語

ストレス負荷超音波撮影法による足関節不安定症の定量的評価の試み　　　　　　　　　　　　　　　
堤 香織, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 21, 4, S178, S178, 2013年10月
(一社)日本臨床スポーツ医学会, 日本語

超音波装置を用いた足関節に対する前方引き出し負荷と移動距離計測の試み　　　　　　　　　　　　　　　
中谷 詩世, 福良 沙霧, 寒川 美奈, 神島 保, 遠山 晴一, 堤 香織, 北海道放射線技術雑誌, 75, 116, 116, 2013年10月
(公社)日本放射線技術学会-北海道部会, 日本語

K-A運動-205 スキー競技における膝前十字靭帯再建術後からの復帰(膝前十字靭帯再建術後のスポーツ復帰を考える,シンポジウム,専門領域特別セッション,A-運動器理学療法,グローバル・スタンダード,第48回日本理学療法学術大会)
寒川 美奈, 理学療法学, 40, 1, 108, 108, 2013年05月24日
公益社団法人日本理学療法士協会, 日本語

加齢に伴う多関節筋の筋機能の変化
笠原 敏史, 齋藤 展士, 寒川 美奈, 高橋 優美, 理学療法学, 40, 大会特別号3, P, 099, 2013年05月
(一社)日本理学療法学会連合, 日本語

低速度での運動停止課題への加齢の影響について
高橋 優美, 笠原 敏史, 齊藤 展士, 寒川 美奈, 理学療法学, 40, 大会特別号3, P, 196, 2013年05月
(一社)日本理学療法学会連合, 日本語

ダイナミックストレッチングが筋腱複合体に及ぼす影響
寒川 美奈, 服部 正樹, 須釜 菜穂子, 武田 直樹, 北海道醫學雜誌 = Acta medica Hokkaidonensia, 88, 1, 46, 46, 2013年01月01日
日本語

ストレッチング法の違いが筋腱複合体の硬度及びスティフネスに及ぼす影響　　　　　　　　　　　　　　　
寒川 美奈, 三上 兼太朗, 三森 由麻, 坂本 健人, 吉田 真, 体力科学, 61, 6, 747, 747, 2012年12月
(一社)日本体力医学会, 日本語

スタティックストレッチング及びダイナミックストレッチングが筋腱スティフネスに与える変化
三上 兼太朗, 寒川 美奈, 青木 喜満, 日本臨床スポーツ医学会誌, 20, 4, S171, S171, 2012年10月
(一社)日本臨床スポーツ医学会, 日本語

ダイナミックストレッチングの異なるプロトコールが関節可動域や筋力に及ぼす影響　　　　　　　　　　　　　　　
坂本 健人, 寒川 美奈, 遠山 晴一, 日本臨床スポーツ医学会誌, 20, 4, S171, S171, 2012年10月
(一社)日本臨床スポーツ医学会, 日本語

スポーツ外傷・障害予防を目的としたスポーツ医科学サポート スキー競技における外傷・障害発生予防を目的としたトレーナーサポートの試み　　　　　　　　　　　　　　　
寒川 美奈, 日本整形外科スポーツ医学会雑誌, 32, 4, 589, 589, 2012年08月
(一社)日本整形外科スポーツ医学会, 日本語

Which types of stretching modifies biomechanical dimensions of a muscle-tendon unit? Authors reply
Mina Samukawa, MANUAL THERAPY, 17, 3, E3, E3, 2012年06月
英語, 速報，短報，研究ノート等（学術雑誌）

競技特性に応じたコンディショニング スキー
寒川美奈, 片寄正樹, 臨床スポーツ医学, 28, 347, 353, 2011年11月01日
日本語

筋疲労に伴う関節可動域及び筋腱組織の変化について
川野 ありさ, 須釜 菜穂子, 寒川 美奈, 理学療法学, 38, Suppl.2, PI2, 290, 2011年04月
(一社)日本理学療法学会連合, 日本語

北海道スキー連盟フリースタイルスキーモーグルチームにおけるメディカルサポートの取り組み(第一報)　　　　　　　　　　　　　　　
松本 尚, 森田 寛子, 吉田 真, 寒川 美奈, 井上 雅之, 北海道整形災害外科学会雑誌, 52, 2, 337, 338, 2011年03月
北海道整形災害外科学会, 日本語

スキークロスナショナルチームにおける傷害発生状況
服部 徹, 伴 さやか, 寒川 美奈, 片寄 正樹, 日本臨床スポーツ医学会誌, 18, 4, S170, S170, 2010年10月
(一社)日本臨床スポーツ医学会, 日本語

ラクロス競技における足関節捻挫受傷と片脚バランス能力の関係
片岡 義明, 寒川 美奈, 遠山 晴一, 原 清和, 日本臨床スポーツ医学会誌, 18, 4, S122, S122, 2010年10月
(一社)日本臨床スポーツ医学会, 日本語

フリースタイルスキーモーグル選手に対するTriple hop distance testのフィールドテストとしての有用性 膝関節周囲筋力・垂直跳びとの関係
森田 寛子, 寒川 美奈, 中田 周兵, 松本 尚, 吉田 真, 井上 雅之, 日本臨床スポーツ医学会誌, 17, 4, S107, S107, 2009年10月
(一社)日本臨床スポーツ医学会, 日本語

大腿四頭筋の筋疲労が片脚Drop-Jump Testに与える影響 二次元動作分析を用いて
中田 周兵, 今 小百合, 寒川 美奈, 片寄 正樹, 日本臨床スポーツ医学会誌, 17, 4, S107, S107, 2009年10月
(一社)日本臨床スポーツ医学会, 日本語

フリースタイルモーグルナショナルチームブロック強化選手における傷害発生状況と柔軟性の評価
寒川 美奈, 吉田 真, 松本 尚, 服部 徹, 片寄 正樹, 日本臨床スポーツ医学会誌, 17, 4, S110, S110, 2009年10月
(一社)日本臨床スポーツ医学会, 日本語

北海道スキー連盟フリースタイルスキーモーグルチームにおけるメディカルサポートの取り組み(第一報)
松本 尚, 森田 寛子, 吉田 真, 寒川 美奈, 井上 雅之, 日本臨床スポーツ医学会誌, 17, 4, S112, S112, 2009年10月
(一社)日本臨床スポーツ医学会, 日本語

フィールドホッケーのドリブル動作における体幹周囲筋の筋活動特性 腰痛発生との関連　　　　　　　　　　　　　　　
今 小百合, 中田 周兵, 寒川 美奈, 山内 太郎, 遠山 晴一, 日本臨床スポーツ医学会誌, 17, 4, S129, S129, 2009年10月
(一社)日本臨床スポーツ医学会, 日本語

フリースタイルスキーモーグルナショナルチームにおける2004-2008シーズン中の傷害発生状況　　　　　　　　　　　　　　　
寒川 美奈, 吉田 真, 松本 尚, 木田 貴英, 谷口 圭吾, 片寄 正樹, 大西 祥平, 日本臨床スポーツ医学会誌, 16, 4, S195, S195, 2008年10月
(一社)日本臨床スポーツ医学会, 日本語

慢性腰痛を有するラグビーフットボール選手における腹横筋の筋活動の検討　　　　　　　　　　　　　　　
浮城 健吾, 寒川 美奈, 伊藤 雄, 遠山 晴一, 山中 正紀, 日本臨床スポーツ医学会誌, 16, 4, S115, S115, 2008年10月
(一社)日本臨床スポーツ医学会, 日本語

ハムストリングス肉離れを有するラグビーフットボール選手の筋力発揮特性について　　　　　　　　　　　　　　　
伊藤 雄, 寒川 美奈, 浮城 健吾, 遠山 晴一, 山中 正紀, 日本臨床スポーツ医学会誌, 16, 4, S198, S198, 2008年10月
(一社)日本臨床スポーツ医学会, 日本語

スキー選手の体力特性　　　　　　　　　　　　　　　
理学療法, 22巻P.300-304, 2005年

モーグルスキーナショナルチームの外傷,障害の動向 12年間の前向き調査から
井上 雅之, 安田 和則, 寒川 美奈, 日本整形外科スポーツ医学会雑誌, 24, 1, 69, 69, 2004年06月
(一社)日本整形外科スポーツ医学会, 日本語

1016 腸骨支持による坐位保持用具の試作(理学療法基礎系46)
高橋 光彦, 笠原 敏史, 齋藤 展士, 寒川 美奈, 渡辺 明日香, 石沢 多実子, 理学療法学, 31, 2, 508, 508, 2004年04月20日
公益社団法人日本理学療法士協会, 日本語

1024 フリースタイルスキーモーグル選手における膝蓋腱炎の発生機序に関する一考察(骨・関節系理学療法44)
寒川 美奈, 山中 正紀, 片寄 正樹, 大西 祥平, 理学療法学, 31, 2, 512, 512, 2004年04月20日
公益社団法人日本理学療法士協会, 日本語

膝靭帯損傷・半月板損傷の理学療法のための検査・測定のポイントと実際　　　　　　　　　　　　　　　
理学療法, 21巻P.141-146, 2004年

前十字靭帯損傷の機能解剖学的特性　　　　　　　　　　　　　　　
理学療法, 21巻P.381-387, 2004年

スポーツ外傷 スキーによる外傷とその理学療法
片寄正樹, 前田克史, 寒川美奈, 理学療法ジャーナル, 30, 3, 177, 186, 1996年03月
日本語

117. スキーにおける前十字靭帯損傷の受傷背景について
寒川 美奈, 菅 靖司, 高橋 小夜利, 菅原 誠, 片寄 正樹, 理学療法学, 22, 2, 117, 117, 1995年04月20日
公益社団法人日本理学療法士協会, 日本語

257. 超音波画像を用いた野球選手の棘上筋の厚さの評価
片寄 正樹, 荻野 利彦, 宮木 重範, 寒川 美奈, 菅 靖司, 菅原 誠, 理学療法学, 21, 2, 257, 257, 1994年04月01日
公益社団法人日本理学療法士協会, 日本語

86. 超音波画像を用いた棘上筋の厚さの評価
片寄 正樹, 荻野 利彦, 宮本 重範, 寒川 美奈, 菅 靖司, 菅原 誠, 理学療法学, 20, 1, 86, 86, 1993年04月01日
公益社団法人日本理学療法士協会, 日本語

KT‐1000Iによる測定の信頼性
菅靖司, 寒川美奈, 菅原誠, 片寄正樹, 北海道理学療法, 9, 43, 46, 1992年10月
日本語

運動器障害理学療法学テキスト 改定第２飯　　　　　　　　　　　　　　　
2015年, ［分担執筆］

スポーツ損傷予防と競技復帰のためのコンディショニング技術ガイド　　　　　　　　　　　　　　　
2011年

復帰を目指すスポーツ整形外科　　　　　　　　　　　　　　　
2011年

公認アスレティックトレーナー専門科目テキスト　　　　　　　　　　　　　　　
2007年

ウィンタースポーツメディシンハンドブック　　　　　　　　　　　　　　　
2006年

スポーツ外傷・傷害の理学診断・理学療法ガイド　　　　　　　　　　　　　　　
2003年

運動器系理学療法学実習　　　　　　　　　　　　　　　
北海道大学
2019年04月 - 現在

運動器系理学療法学　　　　　　　　　　　　　　　
北海道大学
2019年04月 - 現在

リハビリテーション生理学　　　　　　　　　　　　　　　
北海道大学
2012年04月 - 現在

運動療法学　　　　　　　　　　　　　　　
北海道大学
2012年04月 - 現在

スポーツ障害理学療法学　　　　　　　　　　　　　　　
北海道大学
2003年04月 - 現在

高齢者の運動学習理論に基づく筋力調整トレーニングの開発
科学研究費助成事業
2023年04月01日 - 2027年03月31日
笠原 敏史, 寒川 美奈, 齊藤 展士
日本学術振興会, 基盤研究(C), 北海道大学, 23K10422

寒冷環境におけるダイナミックストレッチングが筋腱力学的特性へ与える影響
科学研究費助成事業 基盤研究(C)
2022年04月01日 - 2025年03月31日
寒川 美奈
日本学術振興会, 基盤研究(C), 北海道大学, 22K11574

女性アスリートの足アーチ構造とジャンプ着地動作に与えるエストロゲン濃度の影響
科学研究費助成事業 基盤研究(C)
2021年04月01日 - 2024年03月31日
片寄 正樹, 寒川 美奈, 谷口 圭吾, 岩本 えりか, 戸田 創, 青木 信裕
本研究の目的は、エストロゲン濃度が足内側縦アーチ高に及ぼす影響を検証し、さらに月経周期中の足内側縦アーチ高の変化がジャンプ着地動作時の下肢アライメントに及ぼす影響を検証することである。
2021年度は、研究計画の通り実験環境の準備を整え、月経周期中の血液データ採取および三次元動作解析の実験を開始することができた。結果的に31名の被験者を対象に、月経期・卵胞期後期・黄体期中期の３つのフェーズで安静立位および片脚ジャンプ着地時の足内側縦アーチ高と下肢アライメントの計測を実施した。
現在得られたデータの解析を実施中で、2022年度中の学会発表・論文執筆に向けた作業を進めている。
日本学術振興会, 基盤研究(C), 札幌医科大学, 21K11290

寒冷環境における筋腱伸張性に着目した至適ウォームアップ方法の確立
科学研究費助成事業 基盤研究(C)
2019年04月01日 - 2022年03月31日
寒川 美奈
寒冷環境下では、皮膚温や血流，神経系など生体へ多くの生理学的反応を生じ、最大酸素摂取量や筋力、筋収縮速度の低下など運動機能にも影響を及ぼすといわれている。
ウォームアップは、スポーツ傷害の発生予防、運動機能の向上、柔軟性改善などを目的に運動前に行われているが、これまで常温環境での報告が殆どであり、寒冷環境下でのウォームアップ効果に関する見解はまだ得られていない。したがって本研究は、寒冷環境下における筋腱伸張性低下の要因を明らかにした上で、至適ウォームアップ方法の確立を目指す。
今年度に関しては、寒冷環境における筋腱伸張性に影響を及ぼす生理学的因子の検討として、筋代謝と運動機能に及ぼす影響について調べることとした。そこでまず、寒冷環境（10℃）におけるウォームアップが運動パフォーマンスに及ぼす影響について、常温環境（24℃）と比較して検討した。
結果として、寒冷環境では、常温環境と同様に、ウォームアップによる筋温およびジャンプパフォーマンスの向上効果はみられたが、常温環境と比べて筋温およびジャンプパフォーマンスの低下が明らかとなった。また、寒冷環境におけるウォームアップでは、常温環境下のウォームアップ効果と差が残存していたことから、ウォームアップの強度設定も重要であることが示唆された。
今後は、寒冷環境下における筋温と筋代謝、伸張性の関係性を検討した上で、至適ウォームアップ方法を検討していく。
日本学術振興会, 基盤研究(C), 北海道大学, 19K11542

寒冷環境における至適ストレッチングプログラムの確立
科学研究費助成事業 基盤研究(C)
2016年04月01日 - 2020年03月31日
寒川 美奈, 山口 太一
寒冷刺激による筋腱伸張性の差異と効果的なストレッチング方法について検証した。下腿へのアイシングによる局所寒冷刺激では、腓腹筋筋腱スティフネスや関節可動域、筋腱動態に変化はみられなかった。一方、寒冷環境暴露下においては、常温環境と比較して腓腹筋筋腱スティフネスが高く、筋腱伸張性に変化を与えることがわかった。ストレッチングに関しては、高強度の方が筋腱伸張性をより向上させる効果を明らかにした。
日本学術振興会, 基盤研究(C), 北海道大学, 16K01646

病院と連携する在宅遠隔相談看護師のアセスメント能力向上プログラムの開発と検証
科学研究費助成事業 基盤研究(B)
2015年04月01日 - 2018年03月31日
良村 貞子, 下田 智子, 小笠原 克彦, 吉田 祐子, 鈴木 哲平, 堤 香織, 高橋 紀子, 寒川 美奈, 田村 菜穂美, 佐藤 ひとみ, 船木 典子, 新岡 郁子
看護師のアセスメント能力の向上には、健康相談希望者に関する情報収集能力と的確な分析力の向上が必要である。本研究では、遠隔健康相談を希望する地域住民のＢＭＩ、食事の摂取量と内容、自己採血データ、筋肉量等の体組成、日常生活習慣などのデータを、相談担当の在宅看護師と共有できる、個人情報を保護したデータ管理システムを開発した。在宅看護師による各データの分析のシミュレーション研修は、健康相談者とデータを共有しながらの、在宅看護師による問診および視診において、効率的で効果的であった。
日本学術振興会, 基盤研究(B), 北海道大学, 15H05062

持久走パフォーマンス向上のための適切なダイナミックストレッチングプロトコルの確立
科学研究費助成事業 若手研究(B)
2014年04月01日 - 2017年03月31日
山口 太一, 山中 正紀, 寒川 美奈, 瀧澤 一騎, 柴田 啓介
（研究1）男子陸上競技選手6名が下肢の5回、10回及び15回の速いダイナミックストレッチング（DS）を実施後、最大酸素摂取量（VO2max）の90%相当強度のトレッドミル走を疲労困憊まで実施し運動継続時間（TTE）を測定したものの、回数の違いによる相違はなかった。（研究2）男子陸上競技選手8名がウォームアップ（W-up）として70%VO2max相当強度のトレッドミル走を15分間実施し下肢の速いDSを10回行った後に測定したTTEはW-upのみに比べ短縮した。（研究3）男子陸上競技選手6名が研究2と同様のW-up及びDSを実施し休息を10分おいた後に測定したTTEはW-upのみに比べ延長した。
日本学術振興会, 若手研究(B), 酪農学園大学, 26750273

筋腱機能に着目したダイナミックストレッチングの有効性に関する検証　　　　　　　　　　　　　　　
2012年
寒川 美奈
ヤマハ発動機スポーツ振興財団チャレンジ研究助成, 研究代表者, 競争的資金

スタティックストレッチング及びダイナミックストレッチングによる効果的ウォーミングアップ方法の検討　　　　　　　　　　　　　　　
2010年
寒川 美奈
財団法人上月スポーツ•教育財団スポーツ研究助成, 研究代表者, 競争的資金

MRIによる膝関節回旋運動量の三次元的計測方法の確立　　　　　　　　　　　　　　　
2005年
競争的資金

Three dimensional Analysis of tibial rotation by using MRI　　　　　　　　　　　　　　　
2005年
競争的資金

膝前十字靭帯損傷による膝関節への影響　　　　　　　　　　　　　　　
2003年
競争的資金

Anterior Cruciate ligament Injury　　　　　　　　　　　　　　　
2003年
競争的資金