Coordination of muscle activity for the prevention of disability

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K21259
• 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: Japan University of Health Sciences
• Principal Investigator: Ishii Tomoya 日本保健医療大学, 保健医療学部理学療法学科, 助手 (00910043)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 筋収縮後増強 / 筋活動増強 / 障害予防 / ウォーミングアップ / リハビリテーション

Outline of Final Research Achievements

This study focused on changes in muscle activity due to brief pre-activation (conditioning contraction). We aimed to identify strategies to control the amount of electromyography (EMG) activity required to reduce strain on muscles and joints. In the isometric elbow flexion task, following conditioning contractions, EMG activity either increased or decreased in the biceps brachii muscle, but decreased in the brachioradialis and triceps brachii muscles. Conversely, in the isometric elbow extension task, no change in EMG activity was observed in the biceps, brachioradialis, or triceps muscles after conditioning contractions. These findings suggest that neuromodulation of muscle activity following conditioning contractions may vary depending on the specific muscle involved.

Free Research Field

運動生理学、神経科学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果より、短時間の随意収縮後、収縮強度の違いにより、筋活動量が増大もしくは減少することが明らかになった。また、随意収縮後における筋活動量の変化は、筋によってその反応が異なることが明らかになった。これら知見は、筋や関節への負担軽減のための適切な筋活動量の調整とともに、障害予防に向けた新たなリハビリテーションやウォーミングアップにつながる可能性がある。