Document Detail

Motor cortex excitability does not increase during sustained cycling exercise to volitional exhaustion.
MedLine Citation:
PMID:  22678968     Owner:  NLM     Status:  MEDLINE    
The excitability of the motor cortex increases as fatigue develops during sustained single-joint contractions, but there are no previous reports on how corticospinal excitability is affected by sustained locomotor exercise. Here we addressed this issue by measuring spinal and cortical excitability changes during sustained cycling exercise. Vastus lateralis (VL) and rectus femoris (RF) muscle responses to transcranial magnetic stimulation of the motor cortex (motor evoked potentials, MEPs) and electrical stimulation of the descending tracts (cervicomedullary evoked potentials, CMEPs) were recorded every 3 min from nine subjects during 30 min of cycling at 75% of maximum workload (W(max)), and every minute during subsequent exercise at 105% of W(max) until subjective task failure. Responses were also measured during nonfatiguing control bouts at 80% and 110% of W(max) prior to sustained exercise. There were no significant changes in MEPs or CMEPs (P > 0.05) during the sustained cycling exercise. These results suggest that, in contrast to sustained single-joint contractions, sustained cycling exercise does not increase the excitability of motor cortical neurons. The contrasting corticospinal responses to the two modes of exercise may be due to differences in their associated systemic physiological consequences.
Simranjit K Sidhu; Andrew G Cresswell; Timothy J Carroll
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-07
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  113     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-08-02     Completed Date:  2013-01-08     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  401-9     Citation Subset:  IM    
School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia.
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MeSH Terms
Bicycling / physiology*
Evoked Potentials, Motor / physiology
Heart Rate / physiology
Motor Cortex / physiology*
Muscle Fatigue / physiology
Muscle, Skeletal / physiology
Physical Exertion / physiology
Pyramidal Tracts / physiology
Transcranial Magnetic Stimulation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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