Document Detail


Modelling of aerobic and anaerobic energy production in middle-distance running.
MedLine Citation:
PMID:  16838187     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A mathematical model of performance describing aerobic and anaerobic energy production during exercise was applied to middle-distance running data from world records (WR) and from a group of elite runners (NL). The model is based on the assumption that, above a critical power (Pc), a continuous rate of anaerobic energy production occurs, until the entire anaerobic stores (W') are depleted. The fraction of metabolic power above Pc provided by anaerobic metabolism is denoted alpha. A second power threshold (Pt) sets the limit above which any further increase in power is met exclusively by anaerobic sources. The oxygen uptake kinetics was described by a monoexponential equation with time constant tau. The results show that the model successfully fits the WR over 1,500-5,000 m. However, in the range of distances from 800 to 5,000 m the performance over 800 and 1,000 m were overestimated. Contrary to Pc and the anaerobic contribution at steady state oxygen uptake, the estimate of W' was sensitive to the value assigned to tau in the range from 0 to 30 s. Using best performances from 1,500 to 5,000 m in NL resulted in Pc estimates not significantly different from the metabolic power at the lactate threshold. The anaerobic contribution at steady state oxygen uptake increased from zero at Pc to 8.3% (WR) and 7.8+/-3.1% (NL) at Pt. This suggests that a substantial contribution of anaerobic processes occurs in the range between Pc and Pt, even though the exercise does not elicit maximal aerobic power.
Authors:
Thierry Busso; Michel Chatagnon
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Publication Detail:
Type:  Journal Article     Date:  2006-07-13
Journal Detail:
Title:  European journal of applied physiology     Volume:  97     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-07-28     Completed Date:  2006-10-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  745-54     Citation Subset:  IM    
Affiliation:
Unité de Recherche Physiologie et Physiopathologie de l'Exercice et Handicap, Université de Saint-Etienne, Saint-Etienne, France. busso@univ-st-etienne.fr
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Anaerobic Threshold / physiology
Computer Simulation
Energy Metabolism / physiology*
Humans
Models, Biological*
Oxygen Consumption / physiology
Physical Exertion / physiology
Running / physiology*

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