Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jelekin.2024.102967

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Authorship：Lead author   Language：Japanese   Publisher：日本トレーニング科学会  

Ichushi

J-GLOBAL

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Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: This study used ultrasound shear wave elastography (SWE) to evaluate the mechanical properties of hamstring muscles from cadaveric specimens with knee flexion contractures. METHODS: Hamstring muscles for tensile testing were harvested from Thiel soft-embalmed cadavers with and without knee flexion contracture. Muscle specimens were mounted on a testing machine. The initial load detected when a tensile load was applied to the distal end was used as the slack length. The cross-sectional areas of the muscle at slack length were measured at the proximal and distal sites using B-mode ultrasonography. Subsequently, the muscle specimen was elongated from the slack length to 8% strain, with the shear modulus measured using SWE. Young's modulus (stress/strain) was calculated based on the displacement and tensile force obtained from the tensile test. RESULTS: Regression analysis showed a significant positive linear relationship between the Young's and shear moduli for all specimens at all the sites (P < 0.01 and coefficient of determination: 0.95-0.99). The Young's and average shear moduli at the proximal and distal sites were higher in all hamstring muscles with contractures than in those without contractures. CONCLUSIONS: SWE can be used to estimate Young's moduli of hamstring muscles with contractures. Muscle specimens with contractures exhibited higher resistance to elongation, thereby indicating that their mechanical properties differed from those of muscles without contractures.

DOI： 10.7759/cureus.68343

PubMed

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.57495/jjspt.3.1_6

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jmbbm.2024.106473

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Language：Japanese   Publisher：Japanese society of sports physical therapy  

<b>Objective:</b> The purpose of this study was to determine the relationship between resting quadriceps elasticity measured using shear wave elastography and explosive performance.

<b>Methods:</b> Shear modulus was measured at 90˚ of the hip joint flexion at 0˚, 90˚, and 120˚ of knee joint flexion for the Rectus Femoris (RF), Vastus Medialis (VM), and Vastus Lateralis (VL). We measured rate of torque development during maximal isometric knee extension, squat jump height, rebound jump height, and rebound jump index as indices of exercise performance.

<b>Results</b>: At 0˚ knee joint, a positive correlation was found between the RF and the rate of torque development. At 90˚ knee joint, a positive correlation was found between the RF and the rebound jump index. At 120˚ knee joint, the VM and VL were positively correlated with rate of torque development. A positive correlation was also observed between VM and the rebound jump index.

<b>Conclusion:</b> High resting elasticity of RF in the shortened and mildly extended position and of VM and VL in the extended position may contribute to explosive performance.

DOI： 10.57495/jjspt.2.1_60

CiNii Research

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Language：Japanese   Publisher：Japanese society of sports physical therapy  

<b>Objective:</b> The purpose of this study was to determine the effect of thigh compression sleeves on muscle stress by measuring shear modulus of the muscle during external compression at various compression and contraction intensities.

<b>Methods:</b> The participants in this study were 14 healthy young males with rectus femoris in their right leg. Compressive strength was measured under three conditions: control (no compression), 20 mmHg, and 40 mmHg. The contraction strength was set to 0 percent, 30 percent, and 60 percent of the maximum knee extension muscle strength in the control condition, which was measured beforehand. A gradually increasing knee extension exercise task was then performed. The Measurement point was set at 50 percent of the thigh length.

<b>Results:</b> A main effect of compression intensity was observed on the elastic modulus, but there was no significant interaction. Post-test results revealed a significant decrease in elastic modulus at 20 mmHg compared to the control condition (p<0.05).

<b>Conclusion:</b> Using compression sleeves at 20 mmHg was suggested to reduce the muscle stress induced by muscle contraction.

Other Link： https://search.jamas.or.jp/default/link?pub_year=2024&ichushi_jid=J07742&link_issn=&doc_id=20240709440009&doc_link_id=%2Fft4physi%2F2024%2F000201%2F010%2F0071-0077%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fft4physi%2F2024%2F000201%2F010%2F0071-0077%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

DOI： 10.57495/jjspt.2.1_71

CiNii Research

Ichushi

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.gaitpost.2023.11.001

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Other Link： https://link.springer.com/article/10.1007/s10396-023-01360-5/fulltext.html

DOI： 10.1007/s10396-023-01360-5

PubMed

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Language：Japanese   Publisher：(一社)日本臨床スポーツ医学会  

Other Link： https://search.jamas.or.jp/default/link?pub_year=2023&ichushi_jid=J03582&link_issn=&doc_id=20230913160025&doc_link_id=2020%2Ffiles%2F31-3%2F467-475&url=https%3A%2F%2Fwww.rinspo.jp%2Fjournal%2F2020%2Ffiles%2F31-3%2F467-475.pdf&type=%E6%97%A5%E6%9C%AC%E8%87%A8%E5%BA%8A%E3%82%B9%E3%83%9D%E3%83%BC%E3%83%84%E5%8C%BB%E5%AD%A6%E4%BC%9A%E8%AA%8C&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00032_3.gif

Ichushi

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Language：English   Publishing type：Research paper (scientific journal)  

The present study aims to assess the effect of the hip flexion angle on the shear modulus of the adductor longus (AL) muscle associated with passive hip abduction and rotation. Sixteen men participated in the study. For the hip abduction task, the hip flexion angles used were - 20, 0, 20, 40, 60, and 80°, and the hip abduction angles were 0, 10, 20, 30, and 40°. For the hip rotation task, the hip flexion angles used were - 20, 0, 20, 40, 60, and 80°, hip abduction angles were 0 and 40°, and hip rotation angles were 20° internal rotation, 0° rotation, and 20° external rotation. The shear modulus at 20° extension was significantly higher than that at 80° flexion for the 10, 20, 30 and 40° hip abduction (i.e., P < 0.05). The shear modulus at 20° internal rotation and 20° extension was significantly higher than that at 0° rotation and 20° external rotation, regardless of the hip abduction angle (i.e., P < 0.05). The mechanical stress of the AL muscle associated with hip abduction was higher in the extended position. Furthermore, the mechanical stress could increase with internal rotation only at the hip-extended position.

DOI： 10.1038/s41598-023-36698-w

PubMed

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Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: Assessing muscle flexibility and architecture is important for hamstring strain injury (HSI) prevention. We investigated the relationship between shear modulus and passive force in hamstring muscles at different sites and the effect of muscle architecture on the slope of the shear modulus-passive force using shear wave elastography (SWE). METHODS: The biceps femoris long head (BFlh), semitendinosus (ST), and semimembranosus (SM) muscles were dissected from nine Thiel-embalmed cadavers and fixed to a custom-made mechanical testing machine. Calibrated weights (0-1800 g) were applied gradually in 150-g increments. The shear modulus and anatomical cross-sectional area (ACSA) were measured at proximal, central, and distal points using SWE. The muscle mass and length were measured before the loading test. The shear modulus-passive load relationship of each tested muscle region was analyzed by fitting a least-squares regression line. The increase in shear modulus slope per unit load was calculated and compared between the muscles before and after normalization by the muscle mass, length, and ACSA. RESULTS: The shear modulus and passive force for all hamstring muscles in each region showed a statistically significant linear correlation. Furthermore, the increase in shear modulus slope was greater for BFlh and ST than for SM (P < 0.05), but after normalization by the muscle length and ACSA, there were no significant differences among the muscles. CONCLUSION: The local mechanical properties of individual hamstring muscles can be indirectly estimated using SWE, and the slope of increase in shear modulus reflects characteristics of the muscle architecture.

DOI： 10.1007/s10396-023-01317-8

PubMed

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Ichushi

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

INTRODUCTION: Intramuscular heterogeneity exists in the shear modulus of the rectus femoris (RF) muscle. However, the underlying heterogeneity mechanisms are not entirely understood. Previous research has reported that detachment of superficial tissues reduces the shear modulus by 50%. The aim of this study was to examine the effects of the skin, deep fascia, and intermuscular connections on the shear modulus of the RF at multiple sites. MATERIALS AND METHODS: Eleven donors were fixed using the Thiel method. Measurements were performed at 0°, 60°, and 120° knee flexion in a neutral hip position. Tissue processing was performed under four conditions: superficial tissue (CONT), skin off (SKIN), deep fascia detachment (FASC), and intermuscular connections detachment (ALL). The shear modulus at the proximal, central, and distal regions were measured using ultrasound shear wave elastography. The study was approved by the Sapporo Medical University Ethical Committee. RESULTS: Three-way ANOVA revealed no significant interaction between treatment, site, and angle (P = 0.156), treatment and angle (P = 0.067), or site and angle (P = 0.441). There was a significant effect of treatment (P < 0.001), site (P = 0.010), and angle (P < 0.001) and interaction between treatment and site (P < 0.001). The proximal shear modulus was greater than the central for CONT. There were no significant differences between the measurement sites for SKIN. The distal shear modulus was greater than the proximal for FASC. The distal shear modulus was also greater than the proximal and central for ALL. CONCLUSIONS: Intramuscular regional differences that influence superficial tissue and intermuscular connections of RF elasticity heterogeneity were observed.

DOI： 10.1007/s40477-022-00769-x

PubMed

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Language：English   Publishing type：Research paper (scientific journal)  

We investigated the shear modulus-passive force relationship in the hip adductor longus (AL) muscles of human cadavers and explored the effect of muscle architecture on the elastic properties of the AL muscle using shear wave elastography (SWE). Nine AL muscles were harvested from a soft, embalmed cadaver. The AL muscles were affixed to a custom-built device comprising two clamps, a pulley, and a cable to provide passive loads, which were increased from 0 to 600 g in 60-g increments. The shear modulus of the AL muscle was measured in the proximal (Pro), middle (Mid), and distal (Dis) regions. The masses and anatomical cross-sectional areas (ACSAs) of the AL muscles were measured. The shear modulus-passive load relationship of each tested muscle region was analyzed by fitting a least-squares regression line. Moreover, the rate of increase in the shear modulus per unit load (s) was calculated. The shear modulus and passive force were linearly correlated for all AL muscles in each region (p < 0.01). The mean coefficients of determination (R2 ) for Pro, Mid, and Dis were 0.989, 0.986, and 0.982, respectively. The rate of increase in the shear modulus per unit load significantly correlated with the reciprocal of the muscle mass (r = 0.77, p = 0.02) and ACSA (r = 0.43, p = 0.03). Shear wave elastography can be used as an indirect measure of passive force in any region of the AL muscle. Additionally, the rate of increase in the shear modulus per unit load could be associated with muscle architectural parameters.

DOI： 10.1002/ca.23881

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Language：Japanese   Publisher：The descente and ishimoto memorial foundation for the promotion of sports science  

External compression with a support belt has been used as a means of preventing the development of disability and recurrence of muscle injury. However, the effect of external compression on passive muscle elongation stress has not been fully demonstrated. Muscle elasticity obtained by ultrasound shear wave elastography is highly reflective of the passive force generated by muscle elongation（R2 = 0.99）. To investigate the effect of external compression by a support belt on muscle elasticity and to examine whether local compression is useful in reducing the elongation stress of skeletal muscles.

Methods: The muscle elasticity of the rectus femoris（RF）muscle of 11 healthy males was measured using shear wave elastography（Aixplorer Ver.12, 10-2 MHz linear probe） under three conditions: 40 mmHg compression with a support belt, sham condition, and control condition. We set the wearing conditions to a random order. Measurements were performed in three positions: 0˚, 60˚, and 120˚ of knee flexion at the neutral hip position. We set the order of knee flexion to 0˚, 60˚, and 120˚ to eliminate the effect of stretching. Muscle elasticity was measured at two points: the proximal（33% RF lengths）at the support belt wearing site and the distal（66% RF lengths）non-wearing site.

Results: The proximal muscle elasticity showed an interaction between knee angle and wearing condition and was significantly lower in the compression condition at 40 mmHg pressure than in the control condition at 120˚ of knee flexion（137.8 ± 42.7 v.s 168.5 ± 64.1 kPa, -17.8%, p = .002）. The elasticity of the sham condition at the proximal（120˚: 147.7 ± 39.0 kPa） did not differ from that of the control and 40 mmHg compression conditions at all knee angles. Distal muscle elasticity showed only the main effect of knee angle, not the main effect of wearing condition and interaction（120; Support belt: 126.1 ± 53.2, Control: 146.3 ± 78.0, Sham: 128.5 ± 50.0 kPa）. Conclusions: Compression of 40 mmHg reduced the muscle elasticity at muscle elongation by about 18% compared to the control condition. External compression by the support belt suppresses the increase in muscle stress at the wearing site due to muscle elongation.

DOI： 10.57488/descente.43.0_139

CiNii Research

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This study examined the effect of chest mobilization on intercostal (IC) muscle stiffness using the IC muscle shear modulus. Sixteen healthy young men participated on two days with a minimum of 24 h between the stretching and control conditions (SC and CC). The tasks were resting breathing and deep breathing. The IC muscle shear modulus and muscle activity and rib cage circumference were measured before and after each condition. In the SC, IC stretching was performed for 1 min x 5 sets. In the CC, resting breathing, in a sitting position, was performed for 5 min. In the SC, the IC muscle shear modulus decreased significantly (p < 0.05) at maximum inspiration in the deep breathing task, but there was no significant difference in the CC pre- and post-intervention. The results suggest that IC muscle stretching decreases IC muscle stiffness and improves muscle flexibility and that the IC muscle shear modulus may measure the effectiveness of chest mobilization.

DOI： 10.1016/j.crphys.2022.10.002

PubMed

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: This study aimed to determine (1) intramuscular regional differences in the changes in the shear modulus of the rectus femoris (RF) muscle during passive knee flexion and (2) the relationship between shear modulus and passive knee extension torque. METHOD: The shear modulus maps as an index of muscle stiffness and the passive torque were obtained at seven regions during passive knee flexion at 2°/s within a knee joint range of motion of 0°-130° in 16 healthy males. RESULTS: The shear modulus of RF increased with the knee angle of flexion. The shear modulus of each longitudinal region was greater in the order of proximal, central, and distal region (p < 0.05). The relationship between the shear modulus and passive torque was highly fitted for all 16 subjects (p < 0.05). The mean coefficient of determination (R2) at second-order polynomial model per subject was 0.96 (± 0.03; range 0.61-0.99), and whole group was 0.58 (± 0.03; range 0.54-0.64) in all regions. CONCLUSIONS: The passive stiffness of RF was higher in the proximal region than in the other regions during passive knee flexion. Furthermore, the shear modulus-passive torque was related regardless of the measurement region within a muscle, and the results suggest that the passive knee extension torque reflects passive muscle stiffness of the RF.

DOI： 10.1007/s00421-021-04644-1

PubMed

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: Estimation of muscle passive force from elasticity using shear wave elastography (SWE) has been reported. However, the relationship between the elasticity and passive force of human muscles has not been elucidated. This study investigated the elastic modulus-passive force relationship in human skeletal muscles at multiple sites. METHODS: Four rectus femoris (RF) muscles were dissected from a human Thiel-embalmed cadaver. Calibration weights (0-600 g in 60-g increments) were applied to the distal tendon via a pulley system, and the shear elastic modulus as an index of elasticity was measured using SWE. The shear elastic modulus of the RF was measured at the proximal, central, and distal portions. RESULTS: The results demonstrated that the relationships between the elasticity in the longitudinal direction of the muscle and the passive force were nearly linear for all tested sites, with coefficients of determination ranging from 0.813 to 0.993. CONCLUSION: Shear wave elastography may be used as an indirect method to measure the changing passive force at any site within human muscles.

DOI： 10.1007/s10396-020-01076-w

PubMed

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Authorship：Lead author   Language：Japanese   Publisher：Japanese association of physical therapy fundamentals  

The possibility of estimating muscle passive force from shear modulus using shear wave elastography (SWE) has been reported. However, the relationship between the elastic modulus and the passive force of human skeletal muscles, which is necessary for applications to the human body, has not been elucidated. This study investigates the elastic–passive force relationship in human skeletal muscles at multiple sites. One rectus femoris (RF) muscle was dissected from a Thiel embalmed cadaver. The proximal origin and distal quadriceps tendon were each immobilized with clamps of a pulley device. Calibration weights (0–450 g in 90 g increments) were applied to the distal tendon via a pulley system, and elasticity was simultaneously measured using SWE. The elasticity of the RF was measured at the proximal, central, and distal parts. The results demonstrated that the relationships between the SWE elasticity and the passive muscle force were linear for all the tested sites with coefficients of determination ranging between 0.973 and 0.999. Our study demonstrated that SWE may be used as an indirect method to measure passive muscle force at any site within a muscle in humans.

DOI： 10.24780/jptf.23.1_117

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Language：English   Publishing type：Research paper (scientific journal)  

This study examined the effect of hip flexion angle on the stiffness of the adductor longus (AL) muscle during isometric hip flexion. Seventeen men were recruited. Ten participants performed submaximal voluntary contraction at 0%, 25%, 50%, and 75% of maximal voluntary contraction (MVC) during isometric hip flexion after performing MVC at 0°, 40°, and 80° of hip flexion. Seven participants performed submaximal voluntary tasks during isometric hip extension in addition to hip flexion task. The shear modulus of the AL muscle was used as the index of muscle stiffness, and was measured using ultrasound shear-wave elastography during the tasks at each contraction intensity for each hip flexion angle. During hip flexion, the shear modulus of the AL muscle was higher at 0° than at 40° and 80° of hip flexion at each contraction intensity (p < 0.016). Conversely, a significant effect was not found among hip flexion angle during hip extension at 75% of MVC (p = 0.867). These results suggest that mechanical stress of the AL muscle may be higher at 0° of hip flexion during isometric hip flexion.

DOI： 10.1016/j.jelekin.2020.102493

PubMed

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Language：Japanese   Publisher：日本整形外科超音波学会事務局  

CiNii Research

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Authorship：Lead author   Language：Japanese   Publisher：日本整形外科超音波学会事務局  

CiNii Research

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Language：Japanese   Publisher：日本トレーニング科学会  

Ichushi

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：(一社)日本整形外科超音波学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：(一社)日本整形外科超音波学会  

Ichushi

J-GLOBAL

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Language：English   Publishing type：Research paper, summary (international conference)  

Web of Science

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Language：Japanese   Publisher：日本トレーニング科学会  

Ichushi

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：(一社)日本体力医学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：北海道整形災害外科学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：(公社)日本整形外科学会  

Ichushi

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Language：Japanese   Publisher：(公社)日本整形外科学会  

Ichushi

J-GLOBAL

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Ichushi

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J-GLOBAL

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Language：Japanese   Publisher：(一社)日本臨床スポーツ医学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：(一社)日本臨床スポーツ医学会  

Ichushi

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Language：Japanese   Publisher：(公社)日本整形外科学会  

Ichushi

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Language：Japanese   Publisher：(一社)日本整形外科超音波学会  

Ichushi

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Language：Japanese   Publisher：(一社)日本整形外科超音波学会  

Ichushi

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Language：Japanese   Publisher：(一社)日本整形外科超音波学会  

Ichushi

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Language：Japanese   Publisher：(一社)日本整形外科超音波学会  

Ichushi

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Language：Japanese   Publisher：産業開発機構(株)  

Other Link:： https://search.jamas.or.jp/default/link?pub_year=2023&ichushi_jid=J00116&link_issn=&doc_id=20230519190016&doc_link_id=%2Fan7eizoc%2F2023%2F005506%2F018%2F0097-0102%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fan7eizoc%2F2023%2F005506%2F018%2F0097-0102%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：(公社)日本超音波医学会  

Ichushi

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Language：Japanese   Publisher：(一社)日本整形外科超音波学会  

Ichushi

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Language：Japanese   Publisher：北海道整形災害外科学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：北海道整形災害外科学会  

Ichushi

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Language：Japanese   Publisher：(公社)日本リハビリテーション医学会  

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Language：Japanese   Publisher：(公社)日本リハビリテーション医学会  

Ichushi

J-GLOBAL

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J-GLOBAL

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Ichushi

J-GLOBAL

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Ichushi

J-GLOBAL

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Language：English   Publishing type：Research paper, summary (international conference)  

Web of Science

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J-GLOBAL

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Language：Japanese   Publisher：日本整形外科超音波学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：(公社)日本整形外科学会  

Ichushi

J-GLOBAL

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Language：Japanese   Publisher：The japanese society of physical fitness and sports medicine  

DOI： 10.7600/jspfsm.71.39

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J-GLOBAL

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Language：Japanese   Publisher：(公社)日本超音波医学会  

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Language：Japanese   Publisher：公益社団法人 日本理学療法士協会  

【はじめに、目的】大腿直筋（RF）は股関節，膝関節をまたぐ二関節筋であり，損傷頻度の高い筋である．RF損傷のリスク因子として柔軟性低下が挙げられ，RF柔軟性の計測方法として股関節中間位での膝屈曲角度が用いられているが，End feelに関与する膝屈曲に伴う膝伸展受動トルクとRFの筋スティフネスとの関係性は明らかとなっていない．また近年，RFでは解剖学的研究や電気生理学的な検討によって筋内の形態特性や活動特性に部位差が示されており，筋損傷も近位部で頻発することが報告されている．このことからRFの機械特性の検討においても筋内の不均一性を無視できない可能性がある．そこで本研究では筋スティフネスの指標であり，筋伸長によって生じる受動張力と高い相関関係を示す筋弾性を用いて，他動的膝屈曲運動時におけるRFの近位部・中央部・遠位部の弾性率と膝伸展受動トルクとの関係性を明らかにすることを目的とした．

【方法】対象は若年健常男性8名（年齢20.8±0.9歳，身長171.6±6.5cm，体重62.5±9.0kg）とし，利き足のRFを被験筋とした．弾性計測部位はRFの起始部と停止部（下前腸骨棘から膝蓋骨上縁）を結んだ直線の近位から，それぞれ25%（近位部），50%（中央部），75%（遠位部）の筋束領域と規定した．RFの縦断面における筋弾性率は，超音波診断装置(SuperSonic Imagine社製)のせん断波エラストグラフィ機能により計測したせん断波伝搬速度から算出した．他動膝屈曲運動は股伸展0°，膝屈曲0°から膝屈曲最終域まで角速度2°/secで実施し、その区間の膝伸展受動トルク，RF弾性率を記録した．膝伸展トルクは重力の影響を除くため，先行研究(阿江ら．1992)を用いて下腿質量を体重から推定し，三角関数を用いて補正した．統計処理は膝屈曲に伴う3部位（近位部・中央部・遠位部）の筋弾性率および膝伸展受動トルクの最小値を0，最大値を1とし，膝屈曲0°から10°ごとに弾性とトルクの相対値を算出し，それらの関係性を各被験者でPearsonの積率相関係数を用いて分析を行った．解析には IBM SPSS Statistics ver. 22.0 を使用し，有意水準は5%とした．

【結果】相関分析の結果，近位部(0.932<R<0.988)，中央部(0.813<R<0.996)および遠位部(0.747<R<0.939)であり，対象者全てにおいてRF弾性率と膝伸展トルクとの間に有意な正の相関関係を認めた（p < 0.01）．

【考察】他動運動に伴う筋の弾性変化は受動張力を反映するため，今回の結果から膝伸展受動トルクの増大はRFの受動張力に起因している可能性が示唆された．また，近位部において他の2部位よりも高い相関関係を示す例が多く，股中間位での膝伸展受動トルクはRF近位部の発揮張力が強く影響しているかもしれない．

【結論】股関節中間位における膝屈曲に伴う膝伸展受動トルクは，筋内の部位に依存せず筋弾性と深く関連し，RFの受動張力を反映する可能性がある．

【倫理的配慮，説明と同意】本研究は札幌医科大学倫理委員会の承認を得た上で実施した（承認番号29-2-37）．また，ヘルシンキ宣言に従い，被験者のプライバシーと人権の保護に留意し実験を実施した．

 被験者には事前に研究目的，測定内容及び研究成果を学会や論文などにて報告することを研究実施者が口頭で説明し，書面にて同意を得た．研究実施者は，記名した同意書の写しを被験者に交付し，同意書の原本は当該機関で保管することとした．また，一旦同意した場合でも，被験者に不利益を与えることなく同意を取り消すことができることを説明した．ただし，学会や論文などですでに発表済みのデータについては，同意の撤回が困難であることについて事前に説明した．

DOI： 10.14900/cjpt.46s1.i-99_1

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