Torque decrease during submaximal evoked contractions of the quadriceps muscle is linked not only to muscle fatigue

Journal of Applied Physiology
Boris MatkowskiAlain Martin

Abstract

The aim of this study was to analyze the neuromuscular mechanisms involved in the torque decrease induced by submaximal electromyostimulation (EMS) of the quadriceps muscle. It was hypothesized that torque decrease after EMS would reflect the fatigability of the activated motor units (MUs), but also a reduction in the number of MUs recruited as a result of changes in axonal excitability threshold. Two experiments were performed on 20 men to analyze 1) the supramaximal twitch superimposed and evoked at rest during EMS (Experiment 1, n = 9) and 2) the twitch response and torque-frequency relation of the MUs activated by EMS (Experiment 2, n = 11). Torque loss was assessed by 15 EMS-evoked contractions (50 Hz; 6 s on/6 s off), elicited at a constant intensity that evoked 20% of the maximal voluntary contraction (MVC) torque. The same stimulation intensity delivered over the muscles was used to induce the torque-frequency relation and the single electrical pulse evoked after each EMS contraction (Experiment 2). In Experiment 1, supramaximal twitch was induced by femoral nerve stimulation. Torque decreased by ~60% during EMS-evoked contractions and by only ~18% during MVCs. This was accompanied by a rightward shift of the torque-fre...Continue Reading

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Citations

Jul 20, 2016·Medicine and Science in Sports and Exercise·Valentin DoguetMarc Jubeau
Mar 16, 2017·Medicine and Science in Sports and Exercise·Sidney GrosprêtreRomuald Lepers
Sep 24, 2019·Journal of Applied Physiology·Florian VitryMaria Papaiordanidou
Oct 13, 2019·European Journal of Applied Physiology·Florian VitryMaria Papaiordanidou
Apr 1, 2016·Medicine and Science in Sports and Exercise·Alain MartinJulien Gondin
Nov 11, 2016·Journal of Neurophysiology·Nicolas GueugneauRomuald Lepers
Jan 9, 2021·European Journal of Applied Physiology·Amandine BouguetochSidney Grosprêtre
Oct 1, 2020·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·M John LuuDavid F Collins
Mar 1, 2019·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Cody B BremnerMichael G Miller

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