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  • about definition of moment

    Dear Biomch-L subscriber

    My name is Sae Yong Lee. I am doctorate student studying at University of
    Virginia in Kinesiology program.
    I have question related to moment. Are there anyone help me to clarify the
    definition of moment related termiology?
    1. Difference between joint moment, net joint moment, external moment,
    muscle moment, and internal moment. I'll write down my understanding of
    those terms.
    Joint moment: The moment acting at the joint to overcome external moment.
    net joint moment: Sum of all moment acting at the joint including internal
    (active (muscle) + passive (ligament, joint capsule...), external moment.
    muscle moment: Moment produced by the muscle (different to quantify using
    motion analysis system).
    Internal moment: Moment produced by active (muscle) + passive (ligament,
    joint capsule...). part of joint moment.
    external moment: Moment produced by external forces such as ground reaction
    force.
    Please give me some comments whether or not my understanding is right.

    2. What is general Newtonian inverse dynamics calculating? I have been
    believed that it is internal moment which is moment produced by passive and
    active structures crossing the joint. But I got confused these days while I
    was reading articles. It seems like quite a lot of articles alternatively
    use all those terms I mentioned. Even though the several articles use same
    system to calculate Moment, one said it is external moment and the other
    said internal moment. Is it joint moment, net joint moment, external moment,
    muscle moment, or internal moment.

    3. If anyone use Vicon system or Motion monitor system, what kind of moment
    does this system calculating? Are there any reference article that mention
    about the calculation of moment of these systems?

    Thanks

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