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Fig. 6. External power and work per unit distance. (A,B) 1 g, (C,D) 1.3 g. The mass-specific power (A,C) and the mass-specific work done per unit distance (B,D) to maintain the movement of the centre of mass in the sagittal plane (filled diamonds, ext) to accelerate it forwards (open squares, f) and to lift it against gravity (open triangles, v) are given as a function of the running speed. In C, x and + give the mean values plotted in B x1.3: the agreement with the experimental data shows that a 1.3x increase in gravity causes an ~1.3x increase in work. Lines for external power, Wext, are least-squares linear regressions of all the data, the other lines are weighted means of all the data (Kaleidagraph 3.6.4).





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