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J Appl Physiol (November 30, 2001). doi:10.1152/japplphysiol.00754.2001
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Articles in PresS, published online ahead of print November 30, 2001
J Appl Physiol, 10.1152/jap.00754.2001
Submitted on July 23, 2001
Accepted on October 9, 2001

Modeling the energetics of 100-m running using speed-curves of World Champions

Laurent M Arsac1* and Elio Locatelli2

1 Faculte des Sciences du Sport, Universite Bordeaux 2, BORDEAUX, France
2 International Amateur Athletic Federation (IAAF), MONACO, Monaco

* To whom correspondence should be addressed. E-mail: laurent.arsac{at}u-bordeaux2.fr.

The present study aims to assess energy demand and supply in 100m sprint running. A mathematical model was used where supply has two components, aerobic and anaerobic and demand has three components: energy required to move forward (C), energy required to overcome air resistance (Caero), and energy required to change kinetic energy (Ckin). Supply and demand were equated using assumed efficiency of converting metabolic to external work. The mathematical model uses instantaneous velocities registered by the 1997 IAAF World Champions at 100m in men and women. The supply and demand components obtained in the male Champion were (in J.kg-1): aerobic 30 (5%), anaerobic 607 (95%), C 400 (63%), Caero 83 (13%), Ckin 154 (24%). Comparatively, a model that uses the average velocity of the male and female 100m Champions, overestimates Ckin by 37% and 44% respectively and underestimates Caero by 14%. We argued that such a model is not appropriate because Ckin and Caero are non-linear functions of velocity. Neither height nor body mass seems to have any advantage in the energetics of sprint running.




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