Details of a Researcher - TANIGUCHI Keigo

Papers - TANIGUCHI Keigo

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Does External Compression of Skeletal Muscle Reduce Passive Muscle Elongation Stress?

Taniguchi Keigo, Kodesho Taiki, Kato Takuya, Yokoyama Yu, Saitoh Yuhei

DESCENTE SPORTS SCIENCE ( THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION OF SPORTS SCIENCE ) 43 139 - 145 2022.06

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

Adductor longus: An anatomical study to better understand groin pain.

Takuya Kato, Keigo Taniguchi, Taiki Kodesho, Gakuto Nakao, Yu Yokoyama, Yuhei Saito, Masaki Katayose

Clinical anatomy (New York, N.Y.) ( WILEY ) 35 ( 7 ) 867 - 872 2022.04 [International 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 PubMed

肩甲骨面挙上30°位での肩関節内旋ストレッチングが肩後方関節包のスティフネスに及ぼす即時効果野球経験者を対象にした検討

才崎和哉, 飯田尚哉, 谷口圭吾, 相馬章吾, 戸田創, 金谷耕平, 片寄正樹

日本整形外科超音波学会会誌 ( 日本整形外科超音波学会 ) 32 ( 1 ) 52 - 57 2022.03

肩後方関節包タイトネスは、野球選手に特徴的な所見であり様々な障害のリスク因子となる。屍体研究では肩甲骨面挙上30°位での肩内旋ストレッチングが後方関節包に対し強い受動張力が加わると報告されているが、生体でのストレッチング効果は不明である。本研究は、肩甲骨面挙上30°位での肩内旋ストレッチングが、後方関節包スティフネスに及ぼす即時効果を明らかにすることを目的とした。対象は健常大学野球選手9名とした。肩甲骨面挙上30°位から肩内旋方向に、疼痛が出る直前の強度で150秒間ストレッチングを行った。ストレッチング前と直後、5分後、10分後、15分後、20分後の後方関節包の弾性率を剪断波エラストグラフィで計測し、一元配置分散分析にて比較した。その結果、後方関節包中部、下部ともにストレッチングに伴う弾性率の有意な変化を認めなかった。本研究におけるストレッチングでは、後方関節包スティフネスに対し即時効果を認めなかった。(著者抄録)

腱板修復術後症例における肩関節周囲筋の収縮時スティフネスと最大等尺性肩甲骨面外転筋力の関係

榊善成, 谷口圭吾, 及川直樹, 金谷耕平, 片寄正樹, 倉秀治, 岡村健司

日本整形外科超音波学会会誌 ( 日本整形外科超音波学会 ) 32 ( 1 ) 32 - 39 2022.03

腱板修復術後症例に対する理学療法では、肩関節周囲筋の発揮張力を把握することが重要である。しかし、腱板修復術後症例における肩関節周囲筋の発揮張力が肩甲骨面外転トルクに及ぼす影響は明らかではない。我々は、発揮張力を反映する筋収縮時スティフネスを指標に肩関節周囲筋の収縮時スティフネスと最大等尺性肩甲骨面外転筋力の関係を調査した。対象は腱板修復術後6ヵ月の症例8名とした。課題は肩甲骨面30°外転保持運動とした。患側の棘上筋(前方・後方線維の浅層部と深層部)と三角筋中部線維、僧帽筋上部線維の筋スティフネスと最大等尺性外転筋力の関係を重回帰分析にて検討した。その結果、棘上筋前方線維浅層部のスティフネスが、最大等尺性外転筋力を説明する有意な変数として選択された。したがって、腱板修復術後6ヵ月時の症例では、棘上筋前方線維浅層部の収縮時スティフネスが最大等尺性肩甲骨面外転筋力と強く関連する可能性がある。(著者抄録)

股関節外転に伴う長内転筋の力学ストレスは股関節伸展位で増大する

加藤拓也, 谷口圭吾, 小出所大樹, 中尾学人, 横山祐, 齋藤佑平, 片寄正樹, 渡邉耕太, 山下敏彦

日本整形外科学会雑誌 ( (公社)日本整形外科学会 ) 96 ( 3 ) S1170 - S1170 2022.03

腱板修復術後症例における肩関節周囲筋の収縮時スティフネスと最大等尺性肩甲骨面外転筋力の関係

榊善成, 谷口圭吾, 及川直樹, 金谷耕平, 片寄正樹, 倉秀治, 岡村健司

日本整形外科超音波学会会誌 ( 日本整形外科超音波学会 ) 32 ( 1 ) 32 - 39 2022.03

Posterior shoulder capsule of the dominant arm is stiffer in baseball players than that in non-throwing population.

Naoya Iida, Keigo Taniguchi, Shogo Soma, Kazuya Saizaki, Hajime Toda, Kota Watanabe, Masaki Katayose

Journal of shoulder and elbow surgery 31 ( 7 ) 1335 - 1343 2022.02 [International journal]

BACKGROUND: Posterior shoulder capsule tightness is one of the factors for shoulder injuries in overhead athletes. Recent studies have shown the posterior capsule of the dominant arm to be stiffer than that of the non-dominant arm in baseball players. However, whether posterior capsule tightness in the dominant arm is exclusive to overhead athletes remains unknown. This study aimed to investigate whether the posterior shoulder capsule of the dominant arm in baseball players is stiffer than that in non-throwing population. METHODS: Fifteen male collegiate asymptomatic baseball players (baseball-player group) and fifteen male college students who did not partake in overhead sports (non-throwing group) participated in this study. We measured the shear moduli of the middle and inferior posterior capsules, superior infraspinatus, inferior infraspinatus, teres minor, and posterior deltoid in the dominant arm using ultrasound shear wave elastography. We compared shear moduli between the two groups using an independent samples t-test and Mann-Whitney test. In addition, we investigated the correlation between the range of glenohumeral internal rotation and each shear modulus in each group using the Pearson correlation coefficient. RESULTS: The shear moduli in the baseball-player group were significantly higher than those in the non-throwing group in both the middle posterior capsule (baseball-players group: 36.1 ± 5.6 kPa vs. non-throwing group: 29.0 ± 8.6 kPa; p = 0.018) and inferior posterior capsule (37.1 ± 9.6 kPa vs. 27.9 ± 6.8 kPa; p = 0.002). However, no difference in the shear moduli of individual muscle groups was identified. The glenohumeral internal rotation range exhibited a statistically significant negative correlation with the shear modulus of the inferior posterior capsule in the baseball-player group (Pearson correlation coefficient = -0.586, p = 0.022). CONCLUSION: Our findings suggest that the posterior shoulder capsule of the dominant arm in baseball players is stiffer than that in non-throwing population.

DOI PubMed

Time-course changes in active stiffness of the supraspinatus muscle after arthroscopic rotator cuff repair.

Yoshinari Sakaki, Keigo Taniguchi, Fumiko Sato, Naoki Oikawa, Masaki Katayose, Hideji Kura, Kenji Okamura

Journal of medical ultrasonics (2001) ( SPRINGER JAPAN KK ) 49 ( 1 ) 77 - 84 2022.01 [Domestic journal]

PURPOSE: This study aimed to investigate the time-course changes in the active stiffness of the supraspinatus muscle after arthroscopic rotator cuff repair. METHODS: Eight male patients (mean age 61.5 ± 9.4 years) who underwent arthroscopic rotator cuff repair for small to medium tears were recruited for this study. Movement tasks included 30° shoulder isometric abduction and maximal voluntary isometric contraction of shoulder abduction in the scapular plane. The stiffness of the supraspinatus (anterior superficial, anterior deep, posterior superficial, and posterior deep regions), upper trapezius, and middle deltoid muscles in bilateral shoulders was recorded using ultrasound shear wave elastography. For each subject, the measurement was performed preoperatively and 3, 6, and 12 months postoperatively. RESULTS: The stiffness of the affected anterior superficial region of the supraspinatus muscle 12 months postoperatively was significantly higher than that measured preoperatively and 3 months postoperatively (p < 0.05); it was significantly higher at 6 months postoperatively than at 3 months postoperatively (p < 0.05). Further, the maximal voluntary isometric contraction had significantly improved 12 months postoperatively compared to that measured preoperatively and 3 months postoperatively (p < 0.05). The stiffness of the affected upper trapezius and middle deltoid muscles 12 months postoperatively was significantly lower than that preoperatively (p < 0.05). CONCLUSION: The maximal voluntary isometric contraction 12 months postoperatively possibly increased because of improvement in the active stiffness of the anterior superficial region. Active stiffness of the anterior superficial region may improve 6 months rather than 3 months postoperatively because of the different stages of muscle force, structural repair tendon strength, and remodeling.

DOI PubMed

Effects of shoulder abduction on the stiffness of supraspinatus muscle regions in rotator cuff tear.

Yoshinari Sakaki, Keigo Taniguchi, Masaki Katayose, Hideji Kura, Kenji Okamura

Clinical anatomy (New York, N.Y.) ( WILEY ) 35 ( 1 ) 94 - 102 2022.01 [International journal]

This study aimed to compare the effect of the load of the upper limb on the stiffness of supraspinatus muscle regions during isometric shoulder abduction in the scapular plane in healthy individuals and patients with a rotator cuff tear. Thirteen male patients were scheduled for arthroscopic rotator cuff repair, and 13 healthy male individuals were recruited. The movement task involved 30° isometric shoulder abduction in the scapular plane. The tasks included passive abduction, abduction with half-weight of the upper limb (1/2-weight), and full weight of the upper limb (full-weight). The stiffness of the supraspinatus muscle (anterior superficial, anterior deep, posterior superficial, and posterior deep regions) was recorded using ultrasound shear-wave elastography. The stiffness of the anterior superficial region on the affected side was significantly lower than that on the control side for the 1/2-weight and full-weight tasks. The stiffness of the anterior deep, posterior superficial, and posterior deep regions was not affected. This is the first study that investigated the mechanical effects of different loads on different supraspinatus muscle regions in rotator cuff tear patients. Our results indicate that the anterior superficial region in rotator cuff tear patients was mainly responsible for reduced active stiffness. This might be because this region contributes to force exertion and exhibits atrophy in rotator cuff tears. Hence, the anterior superficial region could be a focal point of quantitative dysfunction evaluation of the supraspinatus muscle in the case of a rotator cuff tear.

DOI PubMed

Effect of chest mobilization on intercostal muscle stiffness.

Yu Yokoyama, Taiki Kodesho, Takuya Kato, Gakuto Nakao, Yuhei Saito, Keigo Taniguchi

Current research in physiology 5 429 - 435 2022 [International journal]

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 PubMed

Elasticity of baseball players' posterior shoulder capsule during internal rotation stretching at 30 degrees of scaption

Naoya Iida, Keigo Taniguchi, Kazuya Saizaki, Shogo Soma, Hajime Toda, Masaki Katayose

TRANSLATIONAL SPORTS MEDICINE ( WILEY ) 4 ( 6 ) 788 - 797 2021.11

Previous cadaveric studies have identified effective stretching positions for the posterior shoulder capsules; however, it is unknown whether these stretching positions are also effective in overhead athletes. This study aimed to investigate whether passive tension was generated in the posterior shoulder capsules in baseball players during stretching positions identified in previous cadaveric studies. Fifteen male baseball players without prior shoulder injuries or surgeries participated in this study. We measured the shear moduli of the middle and inferior posterior capsules of the dominant shoulder in the resting (neutral shoulder internal/external rotation at 30 degrees of flexion) and stretching (maximal shoulder internal rotation at 30 degrees of scapular plane elevation (scaption)) positions using ultrasound shear wave elastography. The shear moduli of the middle posterior capsule were significantly higher in the stretching position than in the resting position (resting vs stretching: 20.9 vs 34.6 kPa, P < .001); however, there was no significant difference in the shear moduli between both positions in the inferior posterior capsule (22.3 vs 29.5 kPa, P = .120). Our results revealed that a large amount of passive tension is generated in the middle posterior capsule during shoulder internal rotation stretching at 30 degrees of scaption in overhead athletes.

DOI

ハムストリングス筋のせん断弾性係数に及ぼす能動的、受動的静的ストレッチの急性効果(Acute effect of active and passive static stretching on shear elastic modulus of the hamstring muscles)

Nakao Gakuto, Taniguchi Keigo, Katayose Masaki

日本基礎理学療法学会学術大会プログラム・抄録集 ( (一社)日本基礎理学療法学会 ) 26回 1G19 - 01 2021.10

腱板修復術症例における肩関節周囲筋の収縮時スティフネスと等尺性肩甲骨面最大外転筋力の関係

榊善成, 谷口圭吾, 佐藤史子, 及川直樹, 金谷耕平, 片寄正樹, 倉秀治, 岡村健司

日本整形外科超音波学会学術集会プログラム・抄録集 ( 日本整形外科超音波学会 ) 32回 152 - 152 2021.07

肩甲骨面挙上30°位での内旋ストレッチングが肩後方関節包のスティフネスに及ぼす急性効果野球経験者を対象とした検討

才崎和哉, 谷口圭吾, 飯田尚哉, 相馬章吾, 戸田創, 金谷耕平, 片寄正樹

日本整形外科超音波学会学術集会プログラム・抄録集 ( 日本整形外科超音波学会 ) 32回 153 - 153 2021.07

Intramuscular differences in shear modulus of the rectus femoris muscle during passive knee flexion.

Taiki Kodesho, Keigo Taniguchi, Takuya Kato, Masaki Katayose

European journal of applied physiology ( SPRINGER ) 121 ( 5 ) 1441 - 1449 2021.05 [International 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 PubMed

Relationship between shear elastic modulus and passive force of the human rectus femoris at multiple sites: a Thiel soft-embalmed cadaver study.

Taiki Kodesho, Keigo Taniguchi, Takuya Kato, Shougo Mizoguchi, Yoshiki Yamakoshi, Kota Watanabe, Mineko Fujimiya, Masaki Katayose

Journal of medical ultrasonics (2001) ( SPRINGER JAPAN KK ) 48 ( 2 ) 115 - 121 2021.04 [Domestic 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 PubMed

Sarcomere length of the vastus intermedius with the knee joint angle change.

Ryosuke Ando, Keigo Taniguchi, Shin Kikuchi, Shogo Mizoguchi, Mineko Fujimiya, Masaki Katayose, Hiroshi Akima

Physiological reports ( WILEY ) 9 ( 5 ) e14771 2021.03 [International journal]

The force-length relation of the skeletal muscles is an important factor influencing the joint torque at a given joint angle. We aimed to clarify the relationship between the resting sarcomere length and knee joint angle in the vastus intermedius (VI) and to compare it with that of the vastus lateralis (VL). The left and right legs were fixed at knee joint angles of 0° and 90°, respectively, in seven cadavers (age at the time of death: 70-91 years). Muscle tissues were dissected by necropsy of the VL and the VI, and electron microscopy images were obtained to calculate the sarcomere length. At knee joint angles of 0° and 90°, the VL sarcomere length was 2.28 ± 0.49 μm and 2.30 ± 0.48 μm, respectively, and the VI sarcomere length was 2.19 ± 0.35 μm and 2.46 ± 0.53 μm, respectively, with a significant difference between the two (p = 0.028). The magnitude of sarcomere length changes with knee joint angle changes was significantly greater for the VI (0.27 ± 0.20 μm) than for the VL (0.02 ± 0.09 μm) (p = 0.009). Thus, knee joint angle changes may affect the passive and active tension produced by the VI more than those produced by the VL.

DOI PubMed

理学療法士として活動したJICAボランティアの活動in Fuji(The work of a Japan International Cooperation Agency volunteer as a physiotherapist in Fiji)

中尾学人, Corneliaus Margaret, Feaomoeata Rokoua Jonetani Heilala, Kumar Chloe, Banuve Mereseini, 谷口圭吾

札幌保健科学雑誌 ( 札幌医科大学保健医療学部 ) ( 10 ) 57 - 61 2021.03

独立行政法人国際協力機構(JICA)が実施するJICAボランティア事業のJICA海外協力隊として,2018年10月からフィジーへ派遣され,そこで理学療法士として活動を行なった。フィジーは非感染性疾患(NCD)の発生率が世界で最も高い国の1つであるとされており,フィジーにおける全死亡者数の内,実に80%以上をNCDが占めている。フィジーの西部地区に位置しているNGO,Foundation for RuralIntegrated Enterprises & Development(FRIEND)の周辺地域には,様々な事情で適切な医療サービス受けることができない村落が多く存在している。FRIENDは,医療サービスが届いていない村人に対して医療サービスを提供するなどして,地域医療に貢献している。本稿では,フィジーでの任期中に実施した,1)クリニックでの診療,2)村への訪問,3)福祉用具の寄付と定期的なサポート,4)現地大学生や地域住民に対する運動指導の講義,5)フィジーで作成した成果物,の5つのNCD対策に関する活動について報告した。(著者抄録)

ヒト大腿直筋の組織弾性と受動張力の関係 Thiel法固定人体標本を用いた検討

小出所大樹, 谷口圭吾, 加藤拓也, 溝口照悟, 渡邉耕太, 藤宮峯子, 片寄正樹

日本基礎理学療法学雑誌 ( (一社)日本基礎理学療法学会 ) 23 ( 1 ) 117 - 122 2021.03

Thiel法固定人体標本のヒト大腿直筋を対象に、筋伸長時の受動張力-筋弾性関係を筋内の複数部位で検討した。研究対象として、大腿部に損傷や変形の無いThiel法固定人体標本の1体1肢(男性、死亡時84歳)を用いた。ヒト屍体の大腿直筋の長軸方向において測定した全ての部位で受動張力とせん断弾性率の間に強い正の相関を認め、回帰式の決定係数R2はいずれの部位でも0.9以上であった。さらに、2回の弾性計測における再現性はいずれの測定部位でも変動係数CVが1%未満、級内相関係数ICCが0.99以上と先行研究と同等の高い再現性が得られた。すなわち、ヒト大腿直筋は筋腹中央部のみならず近位部および遠位部においても筋弾性を用いた受動張力の推定が高い精度で可能であることを示す結果となった。

Effect of hip flexion angle on stiffness of the adductor longus muscle during isometric hip flexion.

Takuya Kato, Keigo Taniguchi, Daisuke Kikukawa, Taiki Kodesho, Masaki Katayose

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology ( ELSEVIER SCI LTD ) 56 102493 - 102493 2021.02 [International 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 PubMed

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Papers - TANIGUCHI Keigo