Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.

Maximal central motor drive is known to decrease during prolonged exercise although it remains to be determined whether a supraspinal deficit exists, and if so, when it appears. The purpose of this study was to evaluate corticospinal excitability and muscle voluntary activation before, during and af...

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Autores principales:	Marc Jubeau, Thomas Rupp, Stephane Perrey, John Temesi, Bernard Wuyam, Patrick Levy, Samuel Verges, Guillaume Y Millet
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/65e9cbf565054a2f90891be56d6652e9
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spelling	oai:doaj.org-article:65e9cbf565054a2f90891be56d6652e92021-11-18T08:31:34ZChanges in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.1932-620310.1371/journal.pone.0089157https://doaj.org/article/65e9cbf565054a2f90891be56d6652e92014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24586559/?tool=EBIhttps://doaj.org/toc/1932-6203Maximal central motor drive is known to decrease during prolonged exercise although it remains to be determined whether a supraspinal deficit exists, and if so, when it appears. The purpose of this study was to evaluate corticospinal excitability and muscle voluntary activation before, during and after a 4-h cycling exercise. Ten healthy subjects performed three 80-min bouts on an ergocycle at 45% of their maximal aerobic power. Before exercise and immediately after each bout, neuromuscular function was evaluated in the quadriceps femoris muscles under isometric conditions. Transcranial magnetic stimulation was used to assess voluntary activation at the cortical level (VATMS), corticospinal excitability via motor-evoked potential (MEP) and intracortical inhibition by cortical silent period (CSP). Electrical stimulation of the femoral nerve was used to measure voluntary activation at the peripheral level (VAFNES) and muscle contractile properties. Maximal voluntary force was significantly reduced after the first bout (13 ± 9%, P<0.01) and was further decreased (25 ± 11%, P<0.001) at the end of exercise. CSP remained unchanged throughout the protocol. Rectus femoris and vastus lateralis but not vastus medialis MEP normalized to maximal M-wave amplitude significantly increased during cycling. Finally, significant decreases in both VATMS and VAFNES (∼ 8%, P<0.05 and ∼ 14%, P<0.001 post-exercise, respectively) were observed. In conclusion, reductions in VAFNES after a prolonged cycling exercise are partly explained by a deficit at the cortical level accompanied by increased corticospinal excitability and unchanged intracortical inhibition. When comparing the present results with the literature, this study highlights that changes at the cortical and/or motoneuronal levels depend not only on the type of exercise (single-joint vs. whole-body) but also on exercise intensity and/or duration.Marc JubeauThomas RuppStephane PerreyJohn TemesiBernard WuyamPatrick LevySamuel VergesGuillaume Y MilletPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 2, p e89157 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marc Jubeau Thomas Rupp Stephane Perrey John Temesi Bernard Wuyam Patrick Levy Samuel Verges Guillaume Y Millet Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
description	Maximal central motor drive is known to decrease during prolonged exercise although it remains to be determined whether a supraspinal deficit exists, and if so, when it appears. The purpose of this study was to evaluate corticospinal excitability and muscle voluntary activation before, during and after a 4-h cycling exercise. Ten healthy subjects performed three 80-min bouts on an ergocycle at 45% of their maximal aerobic power. Before exercise and immediately after each bout, neuromuscular function was evaluated in the quadriceps femoris muscles under isometric conditions. Transcranial magnetic stimulation was used to assess voluntary activation at the cortical level (VATMS), corticospinal excitability via motor-evoked potential (MEP) and intracortical inhibition by cortical silent period (CSP). Electrical stimulation of the femoral nerve was used to measure voluntary activation at the peripheral level (VAFNES) and muscle contractile properties. Maximal voluntary force was significantly reduced after the first bout (13 ± 9%, P<0.01) and was further decreased (25 ± 11%, P<0.001) at the end of exercise. CSP remained unchanged throughout the protocol. Rectus femoris and vastus lateralis but not vastus medialis MEP normalized to maximal M-wave amplitude significantly increased during cycling. Finally, significant decreases in both VATMS and VAFNES (∼ 8%, P<0.05 and ∼ 14%, P<0.001 post-exercise, respectively) were observed. In conclusion, reductions in VAFNES after a prolonged cycling exercise are partly explained by a deficit at the cortical level accompanied by increased corticospinal excitability and unchanged intracortical inhibition. When comparing the present results with the literature, this study highlights that changes at the cortical and/or motoneuronal levels depend not only on the type of exercise (single-joint vs. whole-body) but also on exercise intensity and/or duration.
format	article
author	Marc Jubeau Thomas Rupp Stephane Perrey John Temesi Bernard Wuyam Patrick Levy Samuel Verges Guillaume Y Millet
author_facet	Marc Jubeau Thomas Rupp Stephane Perrey John Temesi Bernard Wuyam Patrick Levy Samuel Verges Guillaume Y Millet
author_sort	Marc Jubeau
title	Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
title_short	Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
title_full	Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
title_fullStr	Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
title_full_unstemmed	Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
title_sort	changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/65e9cbf565054a2f90891be56d6652e9
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Changes in voluntary activation assessed by transcranial magnetic stimulation during prolonged cycling exercise.

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