| Relationship between performance at different exercise intensities and skeletal muscle characteristics. | |
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MedLine Citation:
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PMID: 21436467 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The hypothesis investigated whether exercise performance over a broad range of intensities is determined by specific skeletal muscle characteristics. Seven subjects performed 8-10 exhaustive cycle trials at different work loads ranging from 150 to 700 W (150 min - 20 s). No relationships between the performance times at high and low work loads were observed. A relationship (P<0.05) was observed between the percentage of FTx fibers and the exercise time at 579±21 W (~30 s; r(2)=0.88). Capillary-to-fibre-ratio (r(2): 0.58-0.85) was related (P<0.05) to exercise time at work intensities ranging from 395 to 270 W (2.5-21 min). Capillary density was correlated (r(2)=0.68; P<0.05) with the net rate of plasma K(+) accumulation during a ~3-min bout, and was estimated to explain 50 to 80% (P<0.05) of the total variance observed in exercise performances lasting approximately 30 s -3 min. The Na(+),K(+) pump β1 subunit expression was found to account for 13-34% (P<0.05) during exhaustive exercise of approximately 1-4 min. In conclusion, exercise performance at different intensities is related to specific physiological variables. A large distribution of FTx fibres may play a role during very intense efforts, i.e. ~30 s. Muscle capillaries and the Na(+),K(+) pump β1 subunit seem to be important determinants for performance during exhaustive high-intensity exercises lasting between 30 s to 4 min. |
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Authors:
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F Marcello Iaia; Jorge Perez-Gomez; Martin Thomassen; Nikolai Baastrup Nordsborg; Ylva Hellsten; Jens Bangsbo |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-24 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: - ISSN: 1522-1601 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1University of Copenhagen. |
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