Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.

<h4>Purpose</h4>This study investigated the supraspinal processes of fatigue of the quadriceps muscle in response to repeated cycling sprints.<h4>Methods</h4>Twelve active individuals performed 10 × 6-s "all-out" sprints on a cycle ergometer (recovery = 30 s), follo...

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Autores principales:	Olivier Girard, David J Bishop, Sébastien Racinais
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0a19800f9f0d4e61af93e8f1b0a20f0c
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spelling	oai:doaj.org-article:0a19800f9f0d4e61af93e8f1b0a20f0c2021-11-18T07:47:16ZNeuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.1932-620310.1371/journal.pone.0061793https://doaj.org/article/0a19800f9f0d4e61af93e8f1b0a20f0c2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23650503/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Purpose</h4>This study investigated the supraspinal processes of fatigue of the quadriceps muscle in response to repeated cycling sprints.<h4>Methods</h4>Twelve active individuals performed 10 × 6-s "all-out" sprints on a cycle ergometer (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s). Transcranial magnetic and electrical femoral nerve stimulations during brief (5-s) and sustained (30-s) isometric contractions of the knee extensors were performed before and 3 min post-exercise.<h4>Results</h4>Maximal strength of the knee extensors decreased during brief and sustained contractions (~11% and 9%, respectively; P<0.001). Peripheral and cortical voluntary activation, motor evoked potential amplitude and silent period duration responses measured during briefs contractions were unaltered (P>0.05). While cortical voluntary activation declined (P<0.01) during the sustained maximal contraction in both test sessions, larger reductions occurred (P<0.05) after exercise. Lastly, resting twitch amplitude in response to both femoral nerve and cortical stimulations was largely (> 40%) reduced (P<0.001) following exercise.<h4>Conclusion</h4>The capacity of the motor cortex to optimally drive the knee extensors following a repeated-sprint test was shown in sustained, but not brief, maximal isometric contractions. Additionally, peripheral factors were largely involved in the exercise-induced impairment in neuromuscular function, while corticospinal excitability was well-preserved.Olivier GirardDavid J BishopSébastien RacinaisPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 5, p e61793 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Olivier Girard David J Bishop Sébastien Racinais Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
description	<h4>Purpose</h4>This study investigated the supraspinal processes of fatigue of the quadriceps muscle in response to repeated cycling sprints.<h4>Methods</h4>Twelve active individuals performed 10 × 6-s "all-out" sprints on a cycle ergometer (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s). Transcranial magnetic and electrical femoral nerve stimulations during brief (5-s) and sustained (30-s) isometric contractions of the knee extensors were performed before and 3 min post-exercise.<h4>Results</h4>Maximal strength of the knee extensors decreased during brief and sustained contractions (~11% and 9%, respectively; P<0.001). Peripheral and cortical voluntary activation, motor evoked potential amplitude and silent period duration responses measured during briefs contractions were unaltered (P>0.05). While cortical voluntary activation declined (P<0.01) during the sustained maximal contraction in both test sessions, larger reductions occurred (P<0.05) after exercise. Lastly, resting twitch amplitude in response to both femoral nerve and cortical stimulations was largely (> 40%) reduced (P<0.001) following exercise.<h4>Conclusion</h4>The capacity of the motor cortex to optimally drive the knee extensors following a repeated-sprint test was shown in sustained, but not brief, maximal isometric contractions. Additionally, peripheral factors were largely involved in the exercise-induced impairment in neuromuscular function, while corticospinal excitability was well-preserved.
format	article
author	Olivier Girard David J Bishop Sébastien Racinais
author_facet	Olivier Girard David J Bishop Sébastien Racinais
author_sort	Olivier Girard
title	Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
title_short	Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
title_full	Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
title_fullStr	Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
title_full_unstemmed	Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
title_sort	neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/0a19800f9f0d4e61af93e8f1b0a20f0c
work_keys_str_mv	AT oliviergirard neuromuscularadjustmentsofthequadricepsmuscleafterrepeatedcyclingsprints AT davidjbishop neuromuscularadjustmentsofthequadricepsmuscleafterrepeatedcyclingsprints AT sebastienracinais neuromuscularadjustmentsofthequadricepsmuscleafterrepeatedcyclingsprints
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Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints.

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