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Fig. 5. Metabolic rate was predicted well by the cyclic force hypothesis. (A)
Metabolic rate,
, increased (P<0.05), approximately
with frequency f raised to the 2.5 power, as in
Eqn 7
(R2=0.95). The same prediction, extrapolated to the
low-amplitude trial performed at 0.67 Hz (broken line), also agrees reasonably
well with the independently measured data (open symbol). (B) Metabolic rate
also increased approximately linearly with the empirically measured rate of
force/time 
as in
Eqn 8
(R2=0.95).