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Using oscillations to measure leg stiffness.

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  • Using oscillations to measure leg stiffness.

    Hello,

    I am looking for any citations or comments on using vertical leg
    oscillations to measure leg stiffness.

    I have been using an Excel/VB version of the Spring Mass model to understand
    the relation between running kinetics and gait parameters. The model
    requires the leg stiffness (kN/m).

    I estimate stiffness by measuring the frequency of small vertical (~3 cm)
    oscillations while standing on one leg when the knee is flexed to the
    approximate angle it has during mid-stance (k=m*(2*PI*f)^2)

    Is this a reasonable method for measuring leg stiffness? I obtain values in
    the area of 18+/-2 kN/m?

    Is there any research that compares this simple method with the approach
    that uses the vertical GRF and COM displacement?

    Ted Andresen
    Math Department
    St. Petersburg College
    St. Petersburg, Florida
    ************************************
    Will factor polynomials for food.
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