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ENERGETCS OF BIPEDAL RUNNING

1. METABOLIC COST OF GENERATING FORCE

Summary
Similarly sized bipeds and quadrupeds use nearly the same amount of metabolic energy to run, despite dramatic differences in morphology and running mechanics. It has been shown that the rate of metabolic energy use in quadrupedal runners and bipedal hoppers can be predicted from just body weight and time available to generate force as indicated by the foot ground contact. We tested whether this link between running mechanics and energetics also applied to running bipeds. We measured rates of energy consumption and times of foot contact for humans (mean body mass 78.88kg) and five species of bird mean body mass 0.13-40.1 kg). We find that most (70-90%) of the increase in metabolic rate with speed in running bipeds can be explained by changes in the time available to generate force.
The rate of force generation also explains differences in metabolic rate over the size range of birds measured.......

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Approximate Word Count: 635
Approximate Pages: 3 (250 words per double-spaced page)

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