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Controlling walking velocity?

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  • Controlling walking velocity?

    I, Jody B. Brucker, and Paul Stoneman, doctoral candidates at BYU are
    concerned about whether to control subject walking velocity or not in our
    projects. It is known that velocity affects numerous dependent variables in
    lower extremity gait analysis. Since we are using injuried and non-injuried
    subjects, and measuring them pre- and post-treatment, we want to make sure
    that the differences shown between and within groups are a result of the
    treatment. We understand that setting a target velocity may cause the
    subjects to change their gait pattern. However, if velocity is not
    controlled then the effects shown may be the result of both the velocity
    and the treatment. On the other hand, the walking velocity may increase due
    to the benefical effects of the treatment, then the subjects would have to
    alter their cadence or stride length to meet the target velocity. After
    further reading we understand that velocity could used as a covariate in
    the statisical analysis, but velocity is the result of the cadence and
    stride lengths which will also affect ground reaction forces. Therefore,
    the question is whether the control should be in the design or in the
    statical analysis, and what should be controlled?

    Since this topic may be relevent to many people who do treatment research
    using gait analysis a list of responses will be posted? Thank-you in
    advance for your time and efforts.

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