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Fig. 6. Comparison of optimal minimal cost behavior predictions for constrained
frequency running using cost regions calculated for (A) speed-frequency-cost
space and (B) frequency-step length-cost space. For comparison, both
predictions are displayed on equivalent speed-frequency plots. Thick red lines
represent optimal predicted behavior (zero slope), the orange area represents
region of minimal cost+0.001 ml O2 kg-1 m-1,
and the yellow area that of minimal cost+0.005 ml O2
kg-1 m-1. The general features of the predicted behavior
are not affected by method of calculation.