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  • cocntraction questions

    Researchers,
    I have two questions that I haven't found answers to in my lit
    searches. I hope someone out there can help me. I am interested in
    cocontraction increases with agonist fatigue, specifically in the trunk
    muscles.

    1. I have read two explanations of increased cocontraction with agonist
    fatigue. The first is stability suggested by Kellis et al on the knee
    and Potvin et al on the trunk. The second explanation is the "common
    drive theory" by Psek and Cafarelli for which I can find no direct
    follow up articles. Does anyone have any further information on the
    explanation of increased cocntraction with agonist fatigue or any
    furtherresearch related to the "common drive theory" as it applies to
    cocontraction and fatigue?

    2. In one experiemnt I am planing to do, I have to decide whether to
    use gravity-assisted loading (eg, free weight type of loading) or
    non-gravity-assisted/more controlled loading (eg, Kin-Com dynamometer).
    These exertions will probably be isometric. Does anyone have any
    thoughts/research findings related to the differences between these two
    types of loading conditions? I have a suspicion that they may yield
    different levels of cocontraction and agonist EMG levels.

    Any thoughts on these questions would be very much appreciated. I will
    post a summary of the replies after I receive them. Thanks.

    Dan Kelaher
    NCSU Ergonomnics Lab

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