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Elucidating menicanisms of muscle damage focused on the unique behavior of biarticular muscles

Research Project

Project/Area Number 19K20055
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 59020:Sports sciences-related
Research InstitutionShizuoka Sangyo University

Principal Investigator

Ema Ryoichi  静岡産業大学, スポーツ科学部, 准教授 (10768196)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords筋損傷 / 二関節筋 / 関節角度 / サイクリング
Outline of Research at the Start

運動により筋が損傷すると、身体機能の低下が生じる。筋損傷は伸張性運動によって生じやすいことが分かっているが、その詳細なメカニズムは不明である。また、筋損傷には一度生じると、しばらく生じにくくなる「繰り返し効果」があるが、そのメカニズムもよく分かっていない。本研究では、近位と遠位の二つの関節を跨ぐ二関節筋の特徴的な振る舞いに着目し、筋損傷と繰り返し効果のメカニズムを解明することを目指す。

Outline of Final Research Achievements

Skeletal muscles, commonly known as muscles, often undergo eccentric contractions during physical activities, including sports, where they exert force while lengthening. High-intensity eccentric contractions can result in muscle damage, leading to delayed-onset muscle soreness, decreased physical performance, and even injuries. The mechanism of muscle damage in biarticular muscles (muscles that cross two joints) was investigated. It was found that performing eccentric exercises with the proximal joint extended leads to greater muscle damage compared to exercising with the joint flexed. This may be related to the greater length change during exercise when the proximal joint is extended.

Academic Significance and Societal Importance of the Research Achievements

二関節筋は身体運動において重要な役割を果たすことが分かっている。その二関節筋に筋損傷が生じると、身体運動パフォーマンスの低下や、筋肉痛による運動意欲の減退、ひいては不活動につながる恐れがある。本研究の結果を活用することで、パフォーマンスの低下や不活動を防ぐための効果的な方法を開発することができると考えられる。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Association between elastography-assessed muscle mechanical properties and high-speed dynamic performance2022

    • Author(s)
      Ema Ryoichi
    • Journal Title

      European Journal of Sport Science

      Volume: Online ahead of print Issue: 7 Pages: 1-7

    • DOI

      10.1080/17461391.2022.2097129

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Unique neuromuscular activation of the rectus femoris during concentric and eccentric cycling2022

    • Author(s)
      Ryoichi Ema
    • Journal Title

      Journal of Electromyography and Kinesiology

      Volume: 63 Pages: 102638-102638

    • DOI

      10.1016/j.jelekin.2022.102638

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Age-related differences in the effect of prolonged vibration on maximal and rapid force production and balance ability2020

    • Author(s)
      Ema R, Kanda A, Shoji M, Iida N, Akagi R
    • Journal Title

      Frontiers in physiology

      Volume: 11 Pages: 598996-598996

    • DOI

      10.3389/fphys.2020.598996

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 超音波法による骨格筋形状の計測2023

    • Author(s)
      江間諒一
    • Organizer
      東海体育学会第70回大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Association between elastography-assessed muscle mechanical properties and high-speed dynamic performance2022

    • Author(s)
      Ryoichi Ema
    • Organizer
      27th Annual Congress of the European College of Sports Science
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Unique neuromuscular activation of the rectus femoris during concentric and eccentric cycling2021

    • Author(s)
      Ryoichi Ema
    • Organizer
      26th Annual Congress of the European College of Sports Science
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 短縮性および伸張性サイクリング中の大腿四頭筋の筋活動2020

    • Author(s)
      江間諒一
    • Organizer
      第75回日本体力医学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Age-related differences in the effect of prolonged vibration on maximal and rapid force production and balance ability2020

    • Author(s)
      Ema R, Kanda A, Shoji M, Iida N, Akagi R
    • Organizer
      25th Annual Congress of the European College of Sports Science
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2025-01-30  

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