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Energetics of running: a new perspective

Naturevolume 346, pages265–267 (1990)Cite this article

Abstract

THE amount of energy used to run a mile is nearly the same whether it is run at top speed or at a leisurely pace (although it is used more rapidly at the higher speed). This puzzling independence of energy cost and speed is found generally among running animals1, although, on a per gram basis, cost is much higher for smaller animals. Running involves little work against the environment2; work is done by muscles and tendons to lift and accelerate the body and limbs. Some of the work is recovered from muscle-tendon springs without metabolic cost3,4 and work rate does not parallel metabolic rate with either speed or size. Regardless of the amount of work muscles do, they must be activated and develop force to support the weight of the body. Load-carrying experiments have shown that the cost of supporting an extra newton of load is the same as the weight-specific cost of running5. Size differences in cost are proportional to stride frequency at equivalent speeds, suggesting that the time available for developing force is important in determining cost6,7. We report a simple inverse relationship between the rate of energy used for running and the time the foot applies force to the ground during each stride. These results support the hypothesis8 that it is primarily the cost of supporting the animal's weight and the time course of generating this force that determines the cost of running.

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ArticleOpen access18 May 2021

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Author information

Author notes

  1. C. Richard Taylor: To whom correspondence should be addressed.

Authors and Affiliations

  1. Harvard University, Museum of Comparative Zoology, Concord Field Station, Old Causeway Road, Bedford, Massachusetts, 01730, USA

    Rodger Kram & C. Richard Taylor

Authors
  1. Rodger Kram

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  2. C. Richard Taylor

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