Critical Peripheral Fatigue Thresholds Among Different Force-Velocity Conditions: An Individual-Based Model Approach

Frontiers in Physiology
Baptiste MorelChristophe A Hautier

Abstract

During high intensity exercise, metabosensitive muscle afferents are thought to inhibit the motor drive command to restrict the level of peripheral fatigue to an individual's critical threshold. No evidence exists of an individual relationship between peripheral fatigue and the decrease in voluntary activation reached after prolonged all-out exercise. Moreover, there is no explanation for the previously reported large decrease in voluntary activation despite low metabolic stress during high force contractions. Thirteen active men completed two maximal intensity isokinetic knee extension tests (160 contractions) under conditions of low force - high velocity and high force - low velocity. Neuromuscular testing including maximal torque, evoked torque and voluntary activation, was done every 20 contractions. The exponential modeling of these variables over time allowed us to predict the stable state (asymptote) and the rate of decrease (curvature constant). For both high and low force contractions the evoked torque and voluntary activation asymptotes were negatively correlated (R2 = 0.49 and R2 = 0.46, respectively). The evoked torque asymptotes of the high and low force conditions were positively correlated (R2 = 0.49). For the hi...Continue Reading

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Citations

Apr 12, 2020·European Journal of Applied Physiology·Johannes L Herold, Andreas Sommer
Aug 22, 2020·Experimental Physiology·Martin ChartogneBaptiste Morel
Sep 24, 2020·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Slim ZarzissiThomas J Hureau
Dec 22, 2020·Frontiers in Sports and Active Living·Marine AlhammoudBaptiste Morel
Nov 10, 2020·Frontiers in Physiology·Jean Romain RivièrePierre Samozino
May 5, 2021·The Journal of Experimental Biology·Marine BanseLoïc Kéver

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