Figure 1From: Validation of 24-hour ambulatory gait assessment in Parkinson's disease with simultaneous video observation Comparison of actual stride length (blue squares) and calculated stride length from the gait monitor (red circles) from a healthy control (upper left plot) and a PD subject (lower left plot). Subjects walked along a 30 m hallway wearing a chalk 'spur' to indicate heel strike. Scatter plots on the right hand side demonstrate the linear relationship between actual and measured stride length.Back to article page