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最終更新日：2025/09/13
越野 裕太
コシノ ユウタ
(Yuta Koshino)
論文
- タイトル
- Effects of landing instructions on Achilles tendon load: Emphasising hip flexion as the optimal strategy
- タイトル（英）
- Effects of landing instructions on Achilles tendon load: Emphasising hip flexion as the optimal strategy
- 参照URL
- https://researchmap.jp/yuta_koshino/published_papers/51002383
- 著者
- Yuta Koshino,Mina Samukawa,Tomoya Ishida,Harukazu Tohyama
- 著者（英）
- Yuta Koshino,Mina Samukawa,Tomoya Ishida,Harukazu Tohyama
- 担当区分
- 筆頭著者,責任著者
- 概要
- 概要（英）
- Abstract 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.
- 出版者・発行元
- 出版者・発行元（英）
- Wiley
- 誌名
- Knee Surgery, Sports Traumatology, Arthroscopy
- 誌名（英）
- Knee Surgery, Sports Traumatology, Arthroscopy
- 巻
- 号
- 開始ページ
- 終了ページ
- 出版年月
- 2025年8月29日
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- 0942-2056
- DOI URL
- https://doi.org/10.1002/ksa.70006
- 共同研究・競争的資金等の研究課題