Papers - TANIGUCHI Keigo

Passive muscle tension changes in the biceps femoris long head after biceps femoris short head detachment: A human cadaver study.

Gakuto Nakao, Kazuma Yamagata, Risa Adachi, Koki Ishiyama, Kazuyoshi Kozawa, Kota Watanabe, Yuki Ohsaki, Kousuke Shiwaku, Norio Hayashi, Masaki Katayose, Keigo Taniguchi

Journal of biomechanics   179   112480 - 112480  2024.12  [International journal]

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The functional role of the biceps femoris short head (BFsh) remains unclear. Clarifying the functional role of each biceps femoris head may provide useful insights into the reduction of biceps femoris long head (BFlh) injuries. This study aimed to clarify whether the passive tension in the BFlh would change with BFsh detachment using cadavers. The shear modulus of the BFlh and BFsh was measured using ultrasonic shear wave elastography as an index of passive tension in three tissue processing conditions (intact, removal of all tissues from skin to deep fascia, and BFsh detachment) in four limb positions, with hip [H0°, H90°] and knee [K0°, K90°] joint angles under each tissue processing condition. The measurement site was the distal 30 % of the line connecting the sciatic tuberosity (100 %) and fibular head (0 %). Three-way analysis of variance was conducted with muscles, tissue processing, and positions as factors, which revealed a significant interaction (P < 0.01). The post-test results indicated that the BFlh was significantly higher than the BFsh at H90° and K0° before tissue processing; however, no difference was observed between the muscles after skin and deep fascia removal. After BFsh detachment, the shear modulus of the BFsh decreased, whereas that of the BFlh significantly increased (P < 0.01), suggesting that the BFsh might be involved in the passive tension reduction of the BFlh in a lengthened position, as the shear modulus of the BFlh increased after detachment.

DOI PubMed

Effect of tasks on intramuscular regional differences in rectus femoris elasticity during isometric contraction: An ultrasound shear wave elastography study.

Taiki Kodesho, Kazuma Yamagata, Gakuto Nakao, Masaki Katayose, Keigo Taniguchi

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology   80   102967 - 102967  2024.12  [International journal]

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PURPOSE: This study aimed to investigate intramuscular regional differences and task specificity of rectus femoris (RF) elasticity during isometric contraction. METHODS: Sixteen healthy males (aged 24.3 ± 4.1 years) participated in this study. The tasks included isometric hip flexion (HF) and knee extension (KE). The contractions were maintained at 0%, 30%, and 60% of their respective maximum voluntary isometric contraction (MVC) forces for 5 s each at 50˚ hip flexion and 90˚ knee flexion. RF elasticity was measured in two regions, proximal (33%) and distal (67%). The shear modulus (kPa), measured by shear wave elastography, was used to determine RF elasticity. RESULTS: A significant interaction effect was observed (intensity × region × task) (P = 0.01). Regarding regional differences during contraction, the proximal region exhibited a greater shear modulus than the distal region at 60% MVC in the hip flexion task (P = 0.001). Conversely, no regional differences were observed at either 30% MVC (P = 0.625) or 60% MVC (P = 0.568) in the knee extension task. DISCUSSION: Muscle shear modulus during contraction reflects active force, suggesting that mechanical stress can be applied primarily to the proximal region of the RF during the HF task.

DOI PubMed

超音波せん断波イメージングで得られる筋粘弾性と他動運動時の力 角速度関係との関連

小出所 大樹, 中尾 学人, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 谷口 圭吾

基礎理学療法学 ( (一社)日本基礎理学療法学会 )  27 ( Suppl.1 ) 1 - 1  2024.12

大腿二頭筋短頭の剥離に伴う大腿二頭筋長頭の受動張力変化

中尾 学人, 谷口 圭吾, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 渡邉 耕太, 大崎 雄樹, 林 典雄, 塩泡 孝介, 片寄 正樹, 金谷 耕平

日本整形外科超音波学会学術集会プログラム・抄録集 ( (一社)日本整形外科超音波学会 )  35回   119 - 119  2024.10

超音波研究から生まれた新しい理学療法技術 超音波研究が切り拓く力学ストレス評価の可能性

谷口 圭吾, 中尾 学人, 小出所 大樹, 加藤 拓也, 飯田 尚哉, 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 ( (一社)日本整形外科超音波学会 )  35回   47 - 47  2024.10

等尺性収縮の課題様式の違いが筋弾性に与える影響 循環性要因と筋弾性の関係性に着目して

山形 一真, 小出所 大樹, 中尾 学人, 足立 梨紗, 石山 輝希, 小澤 和祥, 松本 尚, 金谷 耕平, 谷口 圭吾

日本整形外科超音波学会学術集会プログラム・抄録集 ( (一社)日本整形外科超音波学会 )  35回   113 - 113  2024.10

大腿二頭筋長頭の力学的特性 弾性部位差と伸長速度間の応力差

中尾 学人, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 小出所 大樹, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 谷口 圭吾

体力科学 ( (一社)日本体力医学会 )  73 ( 4 ) 179 - 179  2024.08

Validity of Elastic Imaging Evaluation of Hamstring Muscles With Knee Contracture Using Ultrasound Shear Wave Elastography.

Gakuto Nakao, Taiki Kodesho, Kazuma Yamagata, Kota Watanabe, Yuki Ohsaki, Masaki Katayose, Keigo Taniguchi

Cureus   16 ( 8 ) e68343  2024.08  [International journal]

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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 PubMed

大腿二頭筋長頭の力学的特性 弾性部位差と伸長速度間の応力差

中尾 学人, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 小出所 大樹, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 谷口 圭吾

体力科学 ( (一社)日本体力医学会 )  73 ( 4 ) 179 - 179  2024.08

Stress–strain relationship of individual hamstring muscles: A human cadaver study

Gakuto Nakao, Taiki Kodesho, Kazuma Yamagata, Kota Watanabe, Yuki Ohsaki, Masaki Katayose, Keigo Taniguchi

Journal of the Mechanical Behavior of Biomedical Materials ( Elsevier BV )  153   106473 - 106473  2024.05

DOI

Relationship between resting quadriceps elasticity and explosive athletic performance

Adachi Risa, Kodesho Taiki, Nakao Gakuto, Yamagata Kazuma, Taniguchi Keigo

Japanese Journal of Sports Physical Therapy ( Japanese Society of Sports Physical Therapy )  2 ( 1 ) 60 - 70  2024.03

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Objective: The purpose of this study was to determine the relationship between resting quadriceps elasticity measured using shear wave elastography and explosive performance. Methods: 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. Results: 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. Conclusion: 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

Effect of external compression with thigh support belt on muscle elasticity during contraction

Ishiyama Koki, Kodesho Taiki, Nakao Gakuto, Yamagata Kazuma, Fukuyo Chizuru, Taniguchi Keigo

Japanese Journal of Sports Physical Therapy ( Japanese Society of Sports Physical Therapy )  2 ( 1 ) 71 - 77  2024.03

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Objective: 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. Methods: 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. Results: 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). Conclusion: Using compression sleeves at 20 mmHg was suggested to reduce the muscle stress induced by muscle contraction.

DOI

Correction: Relationship between shear elastic modulus and passive muscle force in human hamstring muscles using a Thiel soft-embalmed cadaver.

Gakuto Nakao, Taiki Kodesho, Takuya Kato, Yu Yokoyama, Yuhei Saito, Yuki Ohsaki, Kota Watanabe, Masaki Katayose, Keigo Taniguchi

Journal of medical ultrasonics (2001)    2024.03  [Domestic journal]

DOI PubMed

せん断波イメージングを用いた筋の粘弾性評価 静的ストレッチングの効果検証と関節可動性との関係

小出所 大樹, 谷口 圭吾, 中尾 学人, 山形 一真, 渡邉 耕太, 片寄 正樹, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 3 ) S1359 - S1359  2024.03

ハムストリングスの局所的な力学特性 Thiel法固定献体を用いた検討

中尾 学人, 谷口 圭吾, 小出所 大樹, 山形 一真, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 3 ) S1379 - S1379  2024.03

Morphological and mechanical characteristics of the intrinsic and extrinsic foot muscles under loading in individuals with flat feet

Takumi Kobayashi, Kento Hirota, Ryo Otsuki, Juri Onodera, Taiki Kodesho, Keigo Taniguchi

Gait &amp; Posture ( Elsevier BV )  108   15 - 21  2024.02

DOI

ハイドロリリースにより筋膜間の滑走抵抗は低下する 未固定凍結遺体を用いた生体力学試験

塩泡 孝介, 大坪 英則, 鈴木 大輔, 神谷 智昭, 寺本 篤史, 小出所 大樹, 谷口 圭吾, Stecco Carla

北海道整形災害外科学会雑誌 ( 北海道整形災害外科学会 )  66 ( 143rd suppl ) 51 - 51  2024

Characteristics of the static muscle stiffness of ankle plantar flexors in individuals with chronic ankle instability.

Takumi Kobayashi, Taiki Kodesho, Keita Kinami, Ayuka Takahashi, Konatsu Taniguchi, Keigo Taniguchi

Journal of medical ultrasonics (2001)    2023.08  [Domestic journal]

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PURPOSE: Individuals with chronic ankle instability (CAI) have deficits in closed kinetic chain dorsiflexion that may perpetuate injury. Determining the characteristics of muscle stiffness in the plantar flexors of individuals with CAI may help in developing appropriate treatments. We aimed to highlight the characteristics of static muscle stiffness in ankle plantar flexor muscles during the passive dorsiflexion of the ankle joint in individuals with CAI. METHODS: A total of 30 patients were included in the study based on the International Ankle Consortium criteria. The patients were categorized evenly into healthy, coper, and CAI groups (i.e., 10 patients in each group). After measuring the dorsiflexion range of motion (non-weight-bearing/weight-bearing) of the ankle joint, the static muscle stiffness measurements of the medial gastrocnemius, lateral gastrocnemius, soleus, and peroneus longus were obtained. The measurements were performed during the knee joint's extension and 50° flexion and passive dorsiflexion between the range of 40° plantar flexion and 20° dorsiflexion. RESULTS: The dorsiflexion range of motion of the CAI group was significantly smaller than that of the healthy and coper groups in the weight-bearing position. No interaction was observed for muscle stiffness in both the knee flexion and extension positions, and no significant differences were identified among the three groups. The shear modulus of the soleus at 20° ankle dorsiflexion with knee flexion had a significant negative correlation with the weight-bearing range of motion of the ankle. CONCLUSION: The limitation in the weight-bearing dorsiflexion range of motion in CAI was largely due to factors other than the increased elasticity of the ankle plantar flexor muscles.

DOI PubMed

静的な股関節外転ストレッチングが股関節内転筋群の筋スティフネスに及ぼす急性効果 せん断波エラストグラフィを用いた検討

加藤 拓也, 谷口 圭吾, 小出所 大樹, 片寄 正樹

日本臨床スポーツ医学会誌 ( (一社)日本臨床スポーツ医学会 )  31 ( 3 ) 467 - 475  2023.08

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(背景)股関節外転ストレッチングにより股関節外転可動域の改善が報告されているものの,股関節内転筋群の柔軟性に及ぼす効果は明らかとされていない.本研究は股関節外転による静的ストレッチングが内転筋群の柔軟性に及ぼす影響を解明することを目的とした.(方法)対象は健常成人男性12名(24.0±3.8歳)とした.外転ストレッチングは,股屈曲0°および膝屈曲90°における最大股関節外転位にて1分×5セット実施し,セット間で10秒の休息を設けた.被検筋は長内転筋,大内転筋および薄筋とし筋柔軟性の指標としてせん断弾性率(kPa)をせん断波エラストグラフィ超音波診断装置にて定量した.ストレッチングの介入前後に最大股関節外転角度および外転0°から40°まで10°毎のせん断弾性率を各筋で計測した.(結果)介入後の最大外転角度(47.9°)は介入前(45.1°)と比較して有意に増加した(P<0.01,+6.0%).せん断弾性率は2次の交互作用を認め,介入後に長内転筋のみ外転30°にて8.9%(-1.3kPa),外転40°にて19.9%(-5.0kPa)有意に低下した(P<0.01).一方,大内転筋および薄筋は交互作用および時間の主効果を認めなかった.(考察)股屈曲0°および膝屈曲90°位での股関節外転ストレッチングは,最大外転角度を増大させ,長内転筋の柔軟性を改善させる一方,薄筋および大内転筋には影響を与えないことが示された.(著者抄録)

ハムストリングス各筋の応力-歪み関係 Thiel法固定献体を用いた検討

中尾 学人, 谷口 圭吾, 小出所 大樹, 山形 一真, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 山下 敏彦

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  97 ( 8 ) S1901 - S1901  2023.08