| Influence of exercise intensity and duration on biochemical adaptations in skeletal muscle. | |
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MedLine Citation:
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PMID: 6295989 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The influence of intensity and daily duration of exercise on cytochrome c concentration in the three muscle fiber types was assessed in rats that were treadmill trained for 8 wk (5 days/wk) by 1 of 19 protocols. The importance of exercise duration was determined at six running intensities (10, 20, 30, 40, 50, and 60 m/min). Daily run times resulted in a maximal adaptive change for each running intensity. The general pattern of cytochrome c change, caused by increasing daily run times, followed a first-order manner in all fiber types. The final time-independent asymptotic values were dependent on the intensity of running. In addition, as running intensity was increased, the length of daily run time required to achieve the peak adaptive response was shortened. The intensity influence was very different between fiber types. In the fast-twitch red fiber, the maximal time-independent response at each work intensity was altered by exercise intensity at only submaximal work loads (i.e., the adaptation from 19 to 29 nmol/g was not further increased at 50 and 60 m/min). In contrast, the adaptive response in the fast-twitch white fiber began at 30 m/min (approx 80% VO2max) and increased exponentially as intensity was increased (200% increase at 60 m/min). Whether this different adaptive response between fiber types is due solely to the ordered recruitment of motor units remains to be determined. |
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Authors:
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G A Dudley; W M Abraham; R L Terjung |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of applied physiology: respiratory, environmental and exercise physiology Volume: 53 ISSN: 0161-7567 ISO Abbreviation: J Appl Physiol Publication Date: 1982 Oct |
Date Detail:
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Created Date: 1983-03-11 Completed Date: 1983-03-11 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 7801242 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 844-50 Citation Subset: IM; S |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cytochrome c Group / metabolism* Male Muscles / metabolism* Oxygen Consumption Physical Conditioning, Animal Physical Exertion* Rats Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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AM-00681/AM/NIADDK NIH HHS; AM-21617/AM/NIADDK NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Cytochrome c Group |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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