Motor control with assistive force during isometric elbow flexion

Satoshi Muraki, Keisuke Hayashi, Nursalbiah Nasir, Ping Yeap Loh

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    In the modern society, an assistive/powered suit has been developed to enhance the limb and trunk movements by mechanical force. The effective output of assistive products needs cooperation between the users, that is, human beings and the machine. The present study investigated the motor control of external forces that assist with physical exertion. Sixteen adult male participants performed isometric elbow flexion under two conditions of submaximal workload (20% and 40% of the maximal voluntary contraction) and four levels (0%, 33%, 67%, and 100%) of assistive force. The electromyographic (EMG) activity of the agonist and antagonist muscles (biceps and triceps, respectively) and rating of perceived exertion decreased with increased levels of assistive force under both workload conditions. At the lower level of assistance (33%), the EMG amplitude of the biceps was near the expected amplitude, which denotes that the participants made good use of the assistive force. However, at the higher level of assistance (100%), it was far from the expected values at both workload levels. These results suggest that the effectiveness of assistive force changes according to the level of workload and assistive force, and that various human physiological regulations and motor control would be required during cooperative work with assistive force.

    Original languageEnglish
    Title of host publicationProceedings of the 20th Congress of the International Ergonomics Association (IEA 2018) - Volume III
    Subtitle of host publicationMusculoskeletal Disorders
    EditorsRiccardo Tartaglia, Sara Albolino, Thomas Alexander, Sebastiano Bagnara, Yushi Fujita
    PublisherSpringer Verlag
    Pages191-194
    Number of pages4
    ISBN (Print)9783319960821
    DOIs
    Publication statusPublished - 2019
    Event20th Congress of the International Ergonomics Association, IEA 2018 - Florence, Italy
    Duration: Aug 26 2018Aug 30 2018

    Publication series

    NameAdvances in Intelligent Systems and Computing
    Volume820
    ISSN (Print)2194-5357

    Other

    Other20th Congress of the International Ergonomics Association, IEA 2018
    Country/TerritoryItaly
    CityFlorence
    Period8/26/188/30/18

    All Science Journal Classification (ASJC) codes

    • Control and Systems Engineering
    • General Computer Science

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