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Fig. 3. Vertical force component, vertical COM oscillations and energy and power
fluctuations during a complete stride of a slow (0.94 m s-1; left),
moderate (1.55 m s-1; middle) and fast (2.08 m s-1;
right) bipedal sequence. Black horizontal bars on the top graphs indicate the
stance phase of each foot; hatched vertical bars indicate the double support
phases. For abbreviations, see Table
1.