Neuromuscular fatigue due to alternating concentric and eccentric isokinetic quadriceps muscle activity

Publication: Chapter in Book/Report/Conference proceedingConference contribution - Published abstract for conference with selection processResearchpeer-review

Abstract

Neuromuscular fatigue occurs as an effect of either peripheral and/or central mechanisms. In experimental exercise protocols fatigue has mainly been studied during isometric contraction setups or in pre/post fatigue protocol conditions the majority of which involved submaximal exercise modes. (reviewed by Cairns et al. 2005, and Knicker et al. 2011).
The purpose of the recent study was to reveal central and peripheral fatigue measures during long lasting submaximum concentric eccentric contraction conditions for m. quadriceps femoris in isokinetic mode. Peripheral and central fatigue effects could be
identified as a consequence of the underlying contraction protocol which caused severe declines of force output to be attributed to inhibition of MUAPs as the force decrease was accompanied by a pronounced downshift of the EMG median frequency due to i. deteriorated excitation-contraction coupling, ii. deminished motor neuron and/or muscle fibre excitability. The drop of the rate of MUAP and the related loss
of force output could not be compensated by enhanced recruitment of MUs. The time course of fatigue related parameters reveals reduced conduction velocity as the main contributor to force loss. An initially pronounced drop of force output may occur due to type II muscle fibre fatigue. Central fatigue could have developed in all structures above the neuromuscular interface and can have also involved motivational aspects.
Original languageEnglish
Title of host publicationProceedings of the 9th IACSS Symposium 2013, Istanbul
Publication date20.06.2013
Publication statusPublished - 20.06.2013
EventSymposium of the IACSS - Istanbul, Turkey
Duration: 19.06.201322.06.2013
Conference number: 9

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