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Fig. 11. Mass-specific external mechanical power required to lift and accelerate the center of mass as a function of forward speed. Mechanical power increased with speed during terrestrial locomotion in Kassina (walking- open circles; intermediate gait- crosses; running- filled circles; power=1.5v-0.05; r2=0.45; P<0.0001; solid lines represent 95% confidence intervals). The slope of the linear regression (broken line) represents the mechanical work required to move the center of mass (COM) by 1 m (1.5 J kg-1 m-1).





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