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Schematic comparing trajectories of center of pressure (CoP) prior to step initiation in healthy young, healthy elderly and patients with Parkinson’s disease (PD). Left is stance foot and right is step initiation foot. Black dots indicate initial CoP position over the base of support at the standing position. Yellow line is CoP displacement in a subject with PD, pink line CoP from a healthy elderly subject, and blue line from a healthy young subject.
