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153 pages

p. 15 à 21
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Bioénergétique et activités physiques et sportives

no 54 2001/1


Discipline > Revue > Sommaire > Résumé
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Mais où sont les records d’antan ?

Pietro E. di Prampero
Résumé de l'article
The metabolic power (Er) required to cover any given distance d in the time tp is the product of the energy cost of running per unit of distance (Cr) and the speed (v=d/tp): Er = Cr d/tp. The shortest time (fastest speed) over that distance is achieved when Er is equal to the maximal metabolic power of the subject (Ermax). Between 50 s and 15 min, Ermax decreases with increasing exercise duration (te): Ermax = f(te), the function being defined by the maximal oxygen consumption (V02max) and the energy derived from complete exploitation of anaerobic stores (RAn). Hence, best performance times for any given distance and runner can be obtained as the time values for which Ermax = Er, provided that Cr, V02max and RAn are known. Cr during track running was determined on 16 amateur and 24 elite middle distance runners on whom V02max was also measured and RAn assumed from published data. For both groups and for distances between 1.0 and 5.0 km, best performance times were slightly shorter (4,1 and 1.6% on average), but not significantly different, than actual best times. It is concluded that the above approach is a coherent and useful description of the energetics of middle distance running.
Plan de l'article
• Introduction
• Le coût énergétique de la course à pied
• La course d'endurance
• La course de demi-fond
• Théorie et pratique
• Conclusions
• Références


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