| Physiological and biological factors associated with a 24 h treadmill ultra-marathon performance. | |
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MedLine Citation:
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PMID: 19883385 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The purpose of this study was to examine the physiological and biological factors associated with ultra-endurance performance. Fourteen male runners volunteered to run on a treadmill as many kilometers as possible over a 24-h period (24TR). Maximal oxygen uptake (VO(2max)), velocity associated with VO(2max)(VO(2max)) and running economy (RE) at 8 km/h were measured. A muscle biopsy was also performed in the vastus lateralis muscle. The subjects ran 149.2 ± 15.7 km in 18 h 39 ± 41 min of effective attendance on the treadmill, corresponding to 39.4 ± 4.2% of . Standard multiple-regression analysis showed that performance was significantly (R(2) = 0.82; P = 0.005) related to VO(2max) and specific endurance, i.e. the average speed sustained over the 24TR expressed in . VO(2max) was associated with a high capillary tortuosity (R(2) = 0.66; P = 0.01). Specific endurance was significantly related to RE and citrate synthase activity. It is concluded that a high VO(2max) and an associated developed capillary network are essential for ultra-endurance running performance. The ability to maintain a high %VO(2max) over a 24TR is another factor associated with performance and is mainly related to RE and high mitochondrial oxidative capacity in the vastus lateralis. |
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Authors:
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G Y Millet; J C Banfi; H Kerherve; J B Morin; L Vincent; C Estrade; A Geyssant; L Feasson |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Scandinavian journal of medicine & science in sports Volume: 21 ISSN: 1600-0838 ISO Abbreviation: Scand J Med Sci Sports Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9111504 Medline TA: Scand J Med Sci Sports Country: Denmark |
Other Details:
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Languages: eng Pagination: 54-61 Citation Subset: IM |
Copyright Information:
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© 2009 John Wiley & Sons A/S. |
Affiliation:
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Exercise Physiology Laboratory, Jean Monnet University, Saint-Etienne, France. guillaume.millet@univ-st-etienne.fr |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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