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All other primary results were from the force-varying contractions. ... We separately analyzed force-varying and constant-force contractions from 64 subjects who completed constant-posture tasks about the elbow over a range of forces from 0% to 50% maximum voluntary contraction ... Introduction Estimates of the standard deviation of the surface electromyogram (EMG) signal (EMGσ) serve as a global measure of muscular activation    . ...doi:10.3390/s21155165 fatcat:vug3zud62reexnsbzqjfo77wue