Effects of fatigue on the electromechanical delay components in gastrocnemius medialis muscle

European Journal of Applied Physiology
Susanna RampichiniFabio Esposito

Abstract

Under electrically evoked contractions, the time interval between the onset of the stimulation pulse (Stim) and the beginning of force (F) development can be partitioned (Delay(TOT)), by an electromyographic (EMG), mechanomyographic (MMG) and F combined approach, into three components each containing different parts of the electrochemical and mechanical processes underlying neuromuscular activation and contraction. The aim of the study was to evaluate inter- and intra-operator reliability of the measurements and to assess the effects of fatigue on the different Delay(TOT) components. Sixteen participants underwent two sets of tetanic stimulations of the gastrocnemius medialis muscle, with 10 min of rest in between. After a fatiguing protocol of 120 s, tetanic stimulations were replicated. The same protocol was repeated on a different day. Stim, EMG, MMG and F signals were recorded during contraction. Delay(TOT) and its three components (between Stim and EMG, Δt Stim-EMG; between EMG and MMG, Δt EMG-MMG and between MMG and F, Δt MMG-F) were calculated. Before fatigue, Delay(TOT), Δt Stim-EMG, Δt EMG-MMG and Δt MMG-F lasted 27.5 ± 0.9, 1.4 ± 0.1, 9.2 ± 0.5 and 16.8 ± 0.7 ms, respectively. Fatigue lengthened Delay(TOT), Δt Stim-EM...Continue Reading

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Citations

Dec 8, 2015·Frontiers in Physiology·Tomasz TomiakAlexander I Kostyukov
Jan 21, 2016·Muscle & Nerve·Lilian LacourpailleGaËL Guilhem
Aug 12, 2014·Journal of Applied Physiology·Lilian LacourpailleAntoine Nordez
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Nov 21, 2019·European Journal of Applied Physiology·Emiliano CèFabio Esposito
Mar 7, 2020·Experimental Physiology·Mark Jacunski, Gerrard F Rafferty
Jan 9, 2020·Medicine and Science in Sports and Exercise·Emiliano CèFabio Esposito
Mar 18, 2019·European Journal of Applied Physiology·Yann Le MansecMarc Jubeau
Feb 15, 2017·European Journal of Applied Physiology·Fabio EspositoGiovanni Meola
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Nov 12, 2020·European Journal of Applied Physiology·David G BehmAnthony J Blazevich
Jan 5, 2021·Biomedical Engineering Online·Raphael UwamahoroIndra Devi Subramaniam

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