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Fig. 8. The mass-specific external work done at each step (A) and the step
frequency (B) are plotted as a function of running speed for the experiments
made at 1 g (open circles) and at 1.3 g
(filled circles). It can be seen that, on average, step frequency is increased
by gravity more than the work per step: in other words, an increase in gravity
increases the mechanical power output mainly through an increase in step
frequency. Lines are least-squares linear regressions (1 g) or
weighted mean (1.3 g) of all the data (Kaleidagraph
3.6.4).
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