Document Detail

Prior heavy exercise increases oxygen cost during moderate exercise without associated change in surface EMG.
MedLine Citation:
PMID:  17064938     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to test the hypothesis that prior heavy exercise results in a higher oxygen cost during a subsequent bout of moderate exercise due to changes in muscle activity. Eight male subjects (25+/-2 yr, +/-SE) performed moderate-moderate and moderate-heavy-moderate transitions in work rate (cycling intensity, moderate=90% LT, heavy=80% VO(2) peak). The second bout of moderate exercise was performed after 6 min (C) or 30s (D) of recovery. Pulmonary gas exchange was measured breath-by-breath and surface electromyography was obtained from the vastus lateralis and medialis muscles. Root mean square (RMS) and median power frequency (MDPF) were computed. Prior heavy exercise increased DeltaVO(2)/DeltaWR (C: +2.0+/-0.8 ml min(-1)W(-1), D: +3.4+/-0.8 ml min(-1)W(-1); P<0.05) and decreased exercise efficiency (C: -13.3+/-5.6%, D: -22.2 +/-4.9%; P<0.05) during the second bout of moderate exercise in the absence of changes in RMS. MDPF was slightly elevated ( approximately 2%) during the second bout of moderate exercise, but MDPF was not correlated with V O(2) (r=0.17). These findings suggest that the increased oxygen cost during moderate exercise following heavy exercise is not due to increased muscle activity as assessed by surface electromyography.
Joaquin U Gonzales; Barry W Scheuermann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-10-24
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  18     ISSN:  1050-6411     ISO Abbreviation:  J Electromyogr Kinesiol     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-15     Completed Date:  2008-05-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  99-107     Citation Subset:  IM    
Department of Kinesiology, The University of Toledo, Toledo, OH 43607, USA.
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MeSH Terms
Electromyography / methods,  statistics & numerical data
Exercise / physiology*
Exercise Test / methods,  statistics & numerical data*
Muscle, Skeletal / physiology
Oxygen Consumption / physiology*
Physical Exertion / physiology*
Pulmonary Gas Exchange / physiology
Reference Values
Time Factors

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

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