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最終更新日：2026/11/03
安藤 良介
アンドウ リョウスケ
(Ryosuke Ando)
論文
- タイトル
- タイトル（英）
- Angular Velocity Dependence of Passive Ankle Joint Torque Correlates with Viscosity Coefficient of the Medial Gastrocnemius in Males: A Step Toward Quantifying Muscle Viscosity Using Shear Wave Elastography.
- 参照URL
- https://researchmap.jp/Rando923/published_papers/55402126
- 著者
- 著者（英）
- Taiki Kodesho,Risa Adachi,Koki Ishiyama,Kazuyoshi Kozawa,Gakuto Nakao,Ryosuke Ando,Keigo Taniguchi
- 担当区分
- 概要
- 概要（英）
- OBJECTIVE: To investigate whether shear wave elastography (SWE)-derived elasticity and viscosity indices of the medial gastrocnemius are associated with the velocity-dependent characteristics of passive ankle joint torque during muscle elongation at different angular velocities. METHODS: SWE measured the shear wave velocity, elastic modulus, viscosity coefficient, and shear wave dispersion at multiple static joint positions (at plantarflexion angles of 30°, 15°, and 0°) in 15 healthy young men. Passive dorsiflexion from 30° plantarflexion to 20° dorsiflexion was applied at multiple angular velocities using a dynamometer. The structural damping coefficient in a lumped-parameter model of the ankle and associated muscles was defined as the slope of the regression relating peak torque to angular velocity. RESULTS: No correlation was observed between the SWE-derived viscosity coefficient and the SWE-derived dispersion slope, indices of viscous properties (r = -0.013, p = 0.930). The shear wave velocity, elastic modulus, and viscosity coefficient increased with dorsiflexion, but their change patterns differed. The shear wave dispersion was unaffected by the ankle angle. Significant correlations with the structural damping coefficient were observed only for the viscosity coefficient at 15° (r = 0.652, p = 0.008) and 0° (r = 0.537, p = 0.039) plantarflexion. CONCLUSIONS: The SWE-derived viscosity coefficient, unlike the shear wave dispersion slope, demonstrated a moderate correlation with structural damping in this small study cohort when SWE was measured during moderate stretch of the muscle (plantarflexion). These preliminary findings suggest that the SWE-derived viscosity coefficient may serve as a superior quantitative index for evaluating intrinsic muscle viscosity.
- 出版者・発行元
- 出版者・発行元（英）
- 誌名
- 誌名（英）
- Ultrasound in medicine & biology
- 巻
- 号
- 開始ページ
- 終了ページ
- 出版年月
- 2026年8月19日
- 査読の有無
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- DOI URL
- https://doi.org/10.1016/j.ultrasmedbio.2026.07.006
- 共同研究・競争的資金等の研究課題