Influence of amplitude cancellation on the accuracy of determining the onset of muscle activity from the surface electromyogram.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Mark JesunathadasRoger M Enoka

Abstract

The purpose of the study was to quantify the influence of amplitude cancellation on the accuracy of detecting the onset of muscle activity based on an analysis of simulated surface electromyographic (EMG) signals. EMG activity of a generic lower limb muscle was simulated during the stance phase of human gait. Surface EMG signals were generated with and without amplitude cancellation by summing simulated motor unit potentials either before (cancellation EMG) or after (no-cancellation EMG) the potentials had been rectified. The two sets of EMG signals were compared at forces of 30% and 80% of maximum voluntary contraction (MVC) and with various low-pass filter cut-off frequencies. Onset time was determined both visually and by an algorithm that identified when the mean amplitude of the signal within a sliding window exceeded a specified standard deviation (SD) above the baseline mean. Onset error was greater for the no-cancellation conditions when determined automatically and by visual inspection. However, the differences in onset error between the two cancellation conditions appear to be clinically insignificant. Therefore, amplitude cancellation does not appear to limit the ability to detect the onset of muscle activity from th...Continue Reading

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Citations

May 21, 2015·Journal of Biomechanics·Stefan SeiterleHermano Igo Krebs
Jun 20, 2016·Medical Engineering & Physics·Frederick LutzHartmut Witte
Sep 5, 2014·Journal of Neural Engineering·Mark Ison, Panagiotis Artemiadis
Oct 4, 2014·Journal of Applied Physiology·Dario FarinaRoger M Enoka
Apr 23, 2016·Journal of Applied Physiology·Awad M AlmuklassRoger M Enoka
Sep 3, 2021·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Mark JesunathadasTrenton E Gould

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