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Jody Brucker
10-27-2000, 03:55 AM
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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