Document Detail

Physiological and biological factors associated with a 24 h treadmill ultra-marathon performance.
MedLine Citation:
PMID:  19883385     Owner:  NLM     Status:  In-Process    
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.
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:
Type:  Journal Article    
Journal Detail:
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:
Created Date:  2011-01-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  54-61     Citation Subset:  IM    
Copyright Information:
© 2009 John Wiley & Sons A/S.
Exercise Physiology Laboratory, Jean Monnet University, Saint-Etienne, France.
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