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Fig. 4. (A) The mass-specific work per distance (Wint,dc; J kg-1 m-1; filled circles) done by one leg against the other during the double contact (DC) phase and the mass-specific external work per distance (Wext; J kg-1 m-1; open circles) done to maintain the centre of mass (COM) motion in the sagittal plan are given for each age group as a function of the walking speed. (B) The ratio Wint,dc/Wext is given for each age group as a function of speed in the lower panels. Other indications are as in Fig. 3.





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