Understanding stretch-shortening cycle from the view point of resonance

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K24281
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0909:Sports sciences, physical education, health sciences, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Takeshita Daisuke 東京大学, 大学院総合文化研究科, 准教授 (60847060)
• Project Period (FY): 2019-08-30 – 2022-03-31
• Keywords: 筋-腱複合体 / 共振 / 伸張-短縮サイクル

Outline of Final Research Achievements

The behavior of muscle fibers during dynamic movements can be very complex due to the elasticity of tendon tissue. Therefore, it is difficult to estimate from external information such as joint angles. This study tested whether a theory based on forced oscillation of the mass-spring system can explain muscle fiber dynamics of the triceps surae muscle during hopping. The results showed isometric, shortening to stretching, stretching to shortening contraction of the muscle fibers, which were qualitatively consistent with the theory based on forced oscillation, suggesting the validity of the theory.

Free Research Field

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Academic Significance and Societal Importance of the Research Achievements

本研究は「身体のバネを活かす」ことを力学の強制振動の観点から説明しようする試みであり、得られた知見は腱の弾性を活かすために最適な接地時間があることを示唆する。これは、伸張-短縮サイクルと呼ばれる、走行やホッピングなどにおいて重要であり、身体を効率良く動かすにはどのようにすれば良いのかといった知見につながるものと考えられる。また、体育教育、スポーツ指導、リハビリテーションなどの分野において基礎的な知識となることが期待される。