Local muscle endurance is associated with fatigue-based changes in electromyographic spectral properties, but not with conduction velocity

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Travis W BeckNathan P Wages

Abstract

The purpose of this study was to examine the associations amongst muscle fiber action potential conduction velocity (CV), spectral characteristics of the surface electromyographic (EMG) signal, and endurance time during a sustained submaximal isometric muscle action. Eleven men (mean±SD age=23±4yrs) performed a sustained, submaximal isometric muscle action of the dominant forearm flexors at 60% of the maximum voluntary contraction (MVC) until the designated force level could no longer be maintained. Sixteen separate bipolar surface EMG signals were detected from the biceps brachii with a linear electrode array during this contraction. Two channels from this array were used to measure CV, and one of these two channels was used for further EMG signal processing. The channels that provided the highest signal quality were used for the CV measurements and further data analysis. A wavelet analysis was then used to analyze the bipolar EMG signal, and the resulting wavelet spectrum was decomposed with a nonparametric spectral decomposition procedure. The results showed that the time to exhaustion during the sustained contraction was not correlated with the rate of decrease in CV, but it was highly correlated with both the decrease in h...Continue Reading

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Citations

Jan 23, 2016·BMC Musculoskeletal Disorders·Josef Finsterer, Vivian E Drory
Jul 17, 2016·European Journal of Applied Physiology·Joshua C CarrNathan P Wages
Jul 29, 2016·Muscle & Nerve·Eric M MosierJonathan D Miller
May 26, 2017·Scandinavian Journal of Medicine & Science in Sports·C De BlaiserP Roosen

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