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EMG onset and cessation

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  • EMG onset and cessation

    Greetings All:

    Typically, in the clinical gait analysis setting, the onset and cessation of
    muscle activity is determined by an experienced individual or group of
    individuals by viusual inspection of the pattern. These points are
    expressed as a percent of the gait cycle , stance phase or swing phase.
    Much of the liturature which reports on normal and pathologic gait
    electromyographic activity is not clear on the methodology used to determine
    the threshold of activity (i.e. percent of maximium voluntary contraction,
    percent of maximum magnitude signal during gait cycle, percent of average
    magnitude signal over gait cycle or simply by visual inspection by an
    experienced clinician). Dr. Sutherland's book The Development of Mature
    Walking reports normal onsets and cessations for chilcren and mature gait as
    a percent gait cycle without alluding to the method of this determination
    (possibly in other references?) Visual inspection is commonplace in daily
    clinical application. My question: What are the acceptable methods to
    report EMG timing in clincal and scientific settings? Thank you in
    anticipation of your responses.

    Take care

    Steve Vankoski, MS
    Children's Memorial Hosiptal
    Gait Analysis Laboratory