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Science 2 January 2004:
Vol. 303. no. 5654, pp. 47 - 48
DOI: 10.1126/science.1093588
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

PHYSIOLOGY:
Enhanced: Running a-Fowl of the Law

Norman C. Heglund

Physiologists have long pondered about the amount of energy required to swing the legs during running. As Heglund explains in his Perspective, a lot of energy seems to be required for leg swinging. New work in guinea fowl shows that as the birds run, they consume a significant fraction of the total energy during the leg-swinging phase of locomotion (Marsh et al.).

The author is at Unité de physiologie et biomécanique de la locomotion (Loco), Universite catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium. E-mail: norman.heglund{at}loco.ucl.ac.be

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Does the metabolic rate-flight speed relationship vary among geometrically similar birds of different mass?.
M. W. Bundle, K. S. Hansen, and K. P. Dial (2007)
J. Exp. Biol. 210, 1075-1083
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Science. ISSN 0036-8075 (print), 1095-9203 (online)