Force and electromyography responses during isometric force release of different rates and step-down magnitudes

Jeewon Choi, Wen Liang Yeoh, Ping Yeap Loh, Satoshi Muraki

    研究成果: ジャーナルへの寄稿学術誌査読

    5 被引用数 (Scopus)


    This study investigated motor responses of force release during isometric elbow flexion by comparing effects of different ramp durations and step-down magnitudes. Twelve right-handed participants (age: 23.1 ± 1.1) performed trajectory tracking tasks. Participants were instructed to release their force from the reference magnitude (REF; 40% of maximal voluntary contraction force) to a step-down magnitude of 67% REF or 33% REF and maintain the released magnitude. Force release was guided by ramp durations of either 1 s or 5 s. Electromyography of the biceps brachii and triceps brachii was performed during the experimental task, and the co-contraction ratio was evaluated. Force output was recorded to evaluate the parameters of motor performance, such as force variability and overshoot ratio. Although a longer ramp duration of 5 s decreased the force variability and overshoot ratio than did shorter ramp duration of 1 s, higher perceived exertion and co-contraction ratio were followed. Force variability was greater when force was released to the step-down magnitude of 33% REF than that when the magnitude was 67% REF, however, the overshoot ratio showed opposite results. This study provided evidence proving that motor control strategies adopted for force release were affected by both duration and step-down magnitude. In particular, it implies that different control strategies are required according to the level of step-down magnitude with a relatively short ramp duration.

    ジャーナルHuman movement science
    出版ステータス出版済み - 10月 2019

    !!!All Science Journal Classification (ASJC) codes

    • 生物理学
    • 整形外科およびスポーツ医学
    • 実験心理学および認知心理学


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