Fig. 3

Joint kinematics at different loads during one gait cycle in the sagittal plane. Solid lines represent means of four subjects. Shaded areas represent one standard deviation above and below the means. For convenience, the first row shows ground reaction force (GRF). Each graph begins and ends at initial contact. The vertical dashed line, which represents the toe-off point for each condition, separates the stance phase (before toe off) from the swing phase (after toe off). Positive angles represent flexion, and negative values represent extension. BW: body weight; deg: degree