Document Detail


Sustained Cycling Exercise Increases Intracortical Inhibition.
MedLine Citation:
PMID:  23190593     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: In the current study, we measured EMG suppression induced by subthreshold transcranial magnetic stimulation (TMS) in order to investigate the effects of sustained cycling exercise on intracortical inhibition. METHODS: Sixteen subjects cycled at 75% of their maximum workload (Wmax) for 30 min, during which subthreshold TMS was applied at a defined crank angle where vastus lateralis (VL) electromyography (EMG) amplitude was increasing and approximately 50% of its recorded maximum. Sub-threshold TMS was also applied during nonfatiguing control cycling bouts at 75% and 37.5% of Wmax prior to sustained cycling. RESULTS: Although EMG in VL during control cycling at 37.5% Wmax was approximately half that during cycling at 75% Wmax (P ≤ 0.05), the amount of EMG suppression was not different between workloads (P > 0.05). EMG amplitude in VL recorded in the last 5min of sustained cycling was not different from the first 5 min (P > 0.05), whereas the amount of EMG suppression at the end of the sustained cycling was significantly greater than that at the start (P ≤ 0.05). CONCLUSIONS: The increase in TMS-evoked EMG suppression during sustained cycling implies an increase in the excitability of the intracortical inhibitory interneurons during the exercise. The observed increase in intracortical inhibition is similar to that observed during sustained single joint contractions, suggesting that changes in the responsiveness of intracortical inhibitory interneurons are similar during locomotor exercise and static single joint contractions.
Authors:
Simranjit K Sidhu; Benedikt Lauber; Andrew G Cresswell; Timothy J Carroll
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-27
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia 2Department of Sport Science, University of Freiburg, Freiburg, Germany.
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