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Fig. 4. Metabolic rate increased over fourfold with frequency of isolated leg swinging, for motion faster than the leg's natural frequency. (A) E vs frequency of leg swinging f, showing metabolic rate increasing approximately with f 4 as predicted by force/time hypothesis (Equation 12). Data shown are for all frequencies applied, but the curve fit was only performed on data for fast leg swinging. (B) E vs {tau}, showing metabolic rate increasing approximately linearly with the hypothesized force/time cost (Equation 13). Rate of mechanical work is also likely to contribute, but cannot accurately be distinguished from force/time in overall metabolic cost.





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