Ground reaction forces were recorded at 960Hz from a dual belt instrumented treadmill (BERTEC, Columbus, OH, USA) and low pass filtered using a 2nd order Butterworth filter with a 35Hz cutoff. Following calibration using a static standing trial, Visual3D (C- Motion Inc, Germantown, MD, USA) modeling software was used to reconstruct joint kinematics and kinetics and center of mass trajectories, assuming right-left leg symmetry.