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Fig. 10. The fore–aft and vertical ground reaction force traces, COM velocities and instantaneous work traces of one exemplar file are plotted as a function of gait cycle duration. The grey bars indicate double contact. Also in toddlers the front and back limbs are working against each other during double contact (cf. the fore–aft work traces during double contact). But because of the combination of a slow walking speed and large vertical oscillations of the COM, the vertical work traces are most important in determining the amount of work performed during double contact. In the vertical direction, the front and back limb cooperate in performing work on the COM. Consequently, opposite work during double contact is relatively small compared to work performed on the COM.





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