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Fig. 5. Normalisation by the Froude number. Percentage of recovery of mechanical energy (A) and correlation coefficients between Ep and Ek (B) for toddlers at the first unsupported steps (blue), 1–5 months later (cyan), children older than 2 years of age (violet) and adults (red). Data points for individual steps are plotted as a function of Froude number (Fr=V2g–1L–1, where V is the average speed of locomotion, g the acceleration of gravity, and L the lower limb length). Continuous lines represent second-order-polynomial fittings.





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