Comparing electromyographic and mechanomyographic frequency-based fatigue thresholds to critical torque during isometric forearm flexion

Journal of Neuroscience Methods
C Russell HendrixRichard J Schmidt

Abstract

Theoretically, the critical torque (CT), electromyographic mean power frequency fatigue threshold (EMG MPF(FT)), and mechanomyographic mean power frequency fatigue threshold (MMG MPF(FT)) describe the maximal non-fatiguing isometric torque level. The purposes of this study were threefold: (1) to determine if the mathematical model for estimating the EMG MPF(FT) during isometric muscle actions of the leg extensors was applicable to isometric muscle actions of the forearm flexors; (2) to determine if the mathematical model for estimating the EMG MPF(FT) from the frequency of the EMG signal was applicable to the frequency domain of the MMG signal to estimate a new fatigue threshold called the mechanomyographic mean power frequency fatigue threshold (MMG MPF(FT)); and (3) to compare the mean torque levels derived from the CT, EMG MPF(FT), and MMG MPF(FT) tests during isometric forearm flexion muscle actions. Ten adults (4 men and 6 women, mean ± SD; age = 22.0 ± 2.1 years) performed three or four continuous, fatiguing, isometric muscle actions of the forearm flexors at 30, 45, 60, and 75% of maximum voluntary isometric contraction (MVIC) to determine the time to exhaustion (T(lim)) values. The slope coefficient of the linear relati...Continue Reading

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Citations

Mar 29, 2013·PloS One·Md Anamul IslamNizam Uddin Ahamed
Dec 6, 2014·Sensors·Morufu Olusola IbitoyeAhmad Khairi Abdul Wahab
Jan 14, 2012·Physical Medicine and Rehabilitation Clinics of North America·Moh H Malek, Jared W Coburn
Oct 11, 2014·Medical & Biological Engineering & Computing·Akira Kimoto, Yuji Yamada
Nov 21, 2019·European Journal of Applied Physiology·Emiliano CèFabio Esposito
Apr 12, 2020·European Journal of Applied Physiology·Johannes L Herold, Andreas Sommer

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