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averaging EMG signals

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  • averaging EMG signals

    Hello. I am a first year graduate student currently working on software
    for analyzing on and off times for EMG signals. I see that this has been
    a recent topic on the biomech list, but I have a question that has yet to
    be answered. I am collecting signals from 10 different muscles over the
    gait cycle, for 5 trials per subject. I would like to present my
    resulting on/off signal as an average for the 5 trials. To do this, I
    think it is necessary to normalize the lengths of the trials (they are
    all different lengths, due to natural variation in the gait cycle) so
    that I can average on a point by point basis. However, if I do this,
    won't I be changing the sampling frequency and therefore invalidating any
    kind of averaging? I have seen kinematic data presented in the
    literature as an average of x number of trials
    +/- a certain standard deviation and assume the same sort of problem has
    been encountered and solved in order to present the data this way. I
    would very much appreciate any insight or references to literature that
    might help me solve this problem. I will post a summary of replies in a
    few days. Thank you.
    Pam Wise

    __________________________________________________ _________________

    Pamela Joy Wise _/ _/ _/ _/
    Biomedical Engineering Graduate Student _/_/ _/_/ _/ _/
    Marquette University _/ _/_/ _/ _/ _/
    1504 W. Kilbourn Ave. Apt. D _/ _/ _/ _/ _/
    Milwaukee, WI 53233 _/ _/ _/ _/
    (414)344-6907 _/ _/ _/_/ _/
    __________________________________________________ ________________

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