Table 1.

Definition of start and end of movement cycles for each activity.

	Start	End
Walk	Heel strike *	Subsequent heel strike * on the same side
Jump	Local maxima in left knee flexion angle that preceded each local peak in vertical heel position	Local maxima in left knee flexion angle that succeeded each local peak in vertical heel position
Squat	Local minima in left knee flexion angle	Subsequent local minima in left knee flexion angle

* Heel strike was determined as described by Zeni et al. [32], as the local minima in the anterior-posterior position of the heel relative to the sacrum. The sacrum was defined as the average position of left and right posterior superior iliac spines.