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    We are currently involved in a project which included the use of surface EMG
    during a voluntary movement. Data collection sessions were separated by
    several months. We are interested in comparing the amplitude of the activity
    between the two sessions, however, due to factors such as electrode
    placement, possible changes in muscle strength, changes in muscle fat
    content, etc. we do not feel comfortable just comparing the pre and post
    treatment data. To place the pre and post treatment data on the same scale
    the following has been suggested to us. Develop indiviudual muscle average
    activation waveforms for the data obtained from the pre and post test
    sessions, sum the activity in each waveform, add the two activity totals and
    divide by two. The result would become the normalization value (i.e.
    divisor) for both the pre and post treatment waveform. We are interested in
    comments about this technique and welcome any other suggestions which would
    enable us to make meaningful comparisions across data collection sessions.

    All the replies will be summarized and posted

    Thanks,

    Ajit
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