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alternative normalization procedure EMG

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  • alternative normalization procedure EMG

    Dear Biomch-L browsers,

    Currently I am working at a project to detect changes in EMG activation
    patterns resulting from increased cognitive processing. For this project I
    have tested healthy controls and people suffering from musculoskeletal
    complaints of the upper extremity following extensive use of the computer
    keyboard. For normalizing purposes we measured maximum voluntary
    contraction (MVC) but this method proved problematic for several patients,
    as became clear from behavioral and emg analysis (unstable and
    non-realistic (too low) emg values). Therefore, muscle activity was related
    to an alternative normalizing procedure. For each subject the maximal
    muscular activity across the entire dataset was used to normalize EMG
    activity levels.

    My question: do you people think that this is a legitimate way to analyze
    the data (opinions and possible refs.) or could you come up with an
    alternative method (I already gathered the data so normalizing to a fixed
    weight now is no option).

    I am looking forward to your reactions.

    Kind regards,

    Gijs Bloemsaat

    __________________________________________________ _________
    Gijs Bloemsaat
    Nijmegen Institute for Cognition and Information
    University of Nijmegen - Dept. of Experimental Psychology
    P.O. Box 9104, 6500 HE Nijmegen, The Netherlands
    Voice +31 (0)24 3612758 Fax +31 (0)24 3616066
    __________________________________________________ __________

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