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Re: DISCUSSION FORUM ON CONTEMPORARY ISSUES IN BIOMECHANICS:Topic 2

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  • Re: DISCUSSION FORUM ON CONTEMPORARY ISSUES IN BIOMECHANICS:Topic 2

    Dear all,

    Here are my two pennies worth of thinking about the "THE FUNDAMENTAL
    PROBLEM OF MYOSKELETAL INVERSE DYNAMICS".

    Remarkably, nature does not seem to bother about this fundamental problem.
    Even the simplest animals (including humans) are able to consistently
    reproduce their movement patterns. They do so despite variation in external
    and internal conditions, their limited sensing abilities and their
    ignorance with respect to the fundamentals of Newtonian mechanics. This
    suggests that there should be some simplifying principle. Are we missing
    something?

    Furthermore, Prof Hatze seems to suggest that we need more detailed models,
    more accurate measurements and better data analyses methods in order to get
    more realistic simulations. This is a useful opportunity if we e.g. want to
    accurately quantify the loading of internal structures. However, I doubt
    whether this is the only possibility.

    We could also use simple models and increase the accuracy of our
    simulations by using simple and well-defined tasks. Although these tasks
    are probably no normal part of daily living they might be useful for
    finding some basic principles. Alternatively, we could use the imperfect
    models, measurements and analyses methods as they are and limit our
    conclusions to what's justified by the their accuracy. This requires a
    careful consideration of the limitations.

    I think that's only by combining both simple and complex models that we
    might eventually be able to understand both fundamentals and details of
    human myoskeletal dynamics.

    Liduin



    Liduin S. Meershoek, PhD
    PolyPEDAL-lab | http://polypedal.berkeley.edu
    Department of Integrative Biology | phone: (510) 643-5183
    3060 VLSB #3140 | fax: (510) 643-6264
    Berkeley, CA 94720 | meershoek@socrates.berkeley.edu
    USA

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