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Fig. 4. Mechanical energy of COM. Mean changes (± S.D.) of selected parameters plotted as a function of the time after the onset of independent walking: correlation coefficient between Ep and Ek (A), phase shift between Ep and Ek (B), percentage of recovery of mechanical energy (C), external work per unit of body mass and per unit distance (Wext; D) and internal work per unit of body mass and per unit distance (Wint; E). The time course of changes with age was fitted by an exponential function (r=0.93, 0.89, 0.87 and 0.92 for A, C, D and E, respectively). Data refer to walking at natural speed.





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