A three-compartment muscle fatigue model accurately predicts joint-specific maximum endurance times for sustained isometric tasks.

Journal of Biomechanics
Laura A Frey-LawJesse Heitsman

Abstract

The development of localized muscle fatigue has classically been described by the nonlinear intensity-endurance time (ET) curve (Rohmert, 1960; El Ahrache et al., 2006). These empirical intensity-ET relationships have been well-documented and vary between joint regions. We previously proposed a three-compartment biophysical fatigue model, consisting of compartments (i.e. states) for active (M(A)), fatigued (M(F)), and resting (M(R)) muscles, to predict the decay and recovery of muscle force (Xia and Frey Law, 2008). The purpose of this investigation was to determine optimal model parameter values, fatigue (F) and recovery (R), which define the "flow rate" between muscle states and to evaluate the model's accuracy for estimating expected intensity-ET curves. Using a grid-search approach with modified Monte Carlo simulations, over 1 million F and R permutations were used to predict the maximum ET for sustained isometric tasks at 9 intensities ranging from 10% to 90% of maximum in 10% increments (over 9 million simulations total). Optimal F and R values ranged from 0.00589 (F(ankle)) and 0.0182 (R(ankle)) to 0.00058 (F(shoulder)) and 0.00168 (R(shoulder)), reproducing the intensity-ET curves with low mean RMS errors: shoulder (2.7...Continue Reading

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Citations

Feb 4, 2014·Journal of Occupational and Environmental Hygiene·Lora A Cavuoto, Maury A Nussbaum
Jan 31, 2014·Muscle & Nerve·Maria PapaiordanidouDavid Guiraud
Jun 10, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Kelly Cristina dos Santos BerniDelaine Rodrigues-Bigaton
Jun 17, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Alison C McDonaldPeter J Keir
Jan 13, 2018·Ergonomics·Linda M RoseW Patrick Neumann
Nov 28, 2015·Journal of Biomechanical Engineering·Michael A SamaanStacie I Ringleb

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