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

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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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