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  • Impact force values

    Hello:
    During my graduate research project, I have found some results
    which need clarification. I am comparing heel strike impact force
    values (Fz1) during running at 3 m/sec with shoes versus no shoes
    measured by a force platform. What I have noticed is that the
    barefoot impact force values are actually lower than the shoe
    conditions for each subject. I have collected an ample amount of
    "good" trials (n= 25) monitored by light beam cells at chest level.
    Good trials were defined as a trial that was free of unaltered gait, at
    the appropriate speed, and within the force platform boundary. The
    shoes selected have similar midsole construction and lasting (i.e.
    shape). The original plan was to use the barefoot trials as a
    baseline for comparison of impact force magnitudes between
    running shoes. It was though that a slow rate (3 m/sec) would have
    eliminated this effect. One would think that shoes are not creating
    high impact forces during running. We hypothesize that the
    barefoot impact force values are lower due to altered gait. It seems
    participants proprioceptively run with less heel strike leg extension
    in an attempt to decrease heel strike impact forces. Is this the
    case, and at what velocity would gait patterns remain relatively the
    same. Any other words of advice are welcome.

    Cheers,

    Kal Valjakka
    kalvaljakka@home.com
    kalvaljakka@hotmail.com
    Lakehead University
    School of Kinesiology,
    Biomechanics Laboratory
    807-767-7778

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