| Prior heavy exercise increases oxygen cost during moderate exercise without associated change in surface EMG. | |
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MedLine Citation:
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PMID: 17064938 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Joaquin U Gonzales; Barry W Scheuermann |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-10-24 |
Journal Detail:
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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:
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Created Date: 2008-01-15 Completed Date: 2008-05-16 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9109125 Medline TA: J Electromyogr Kinesiol Country: England |
Other Details:
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Languages: eng Pagination: 99-107 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, The University of Toledo, Toledo, OH 43607, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Electromyography / methods, statistics & numerical data Exercise / physiology* Exercise Test / methods, statistics & numerical data* Humans Male Muscle, Skeletal / physiology Oxygen Consumption / physiology* Physical Exertion / physiology* Pulmonary Gas Exchange / physiology Reference Values Time Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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