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An isometric maximal voluntary contraction (iMVC) is mostly used for the purpose of EMG normalization, a procedure described in the scientific literature in order to compare muscle activity among different muscles and subjects.
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Surface electromyography (EMG) is a non-invasive
method used to obtain information on muscle activity.
Absolute EMG amplitude level is of interest, for instance,
in clinical studies, since patients usually can not perform
maximum contractions (van Diee¨n et al., 2003), or to make
differences in EMG activity between a pain and a non-pain
group come to light (Danoff, 1986). However, absolute
EMG values depend on many factors unrelated to the level
of muscle activation (e.g. van Diee¨n et al., 2003).
