Fig. 2.

Vector plots demonstrating the change in minimum toe clearance with relation to the change in step length between preferred and fast gait velocity conditions in the control and PD groups. Data are presented for control (n = 38) and PD (n = 35) groups. Data is not included for one PD participant as they displayed 100% unimodal toe trajectories during the preferred gait velocity condition. The dot denotes the minimum toe clearance and step length obtained during the preferred gait velocity condition.