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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Gait Posture. 2015 Sep 25;43:125–131. doi: 10.1016/j.gaitpost.2015.08.015

Figure 2.

Figure 2

Representative APAs observed during gait initiation in Experiment I. A. Normal APA detected in a control subject. B. Small APA detected in a subject with PD. C. Feeble APA detected in a subject with PD. D. Feeble or absent, undetected APA in a subject with PD. Upper panel: COP displacements in the medio-lateral (ML) and antero-posterior (AP) directions, and trajectories of the malleolus and fifth metatarsal markers. Lower panel: trunk acceleration (ACC) in the medio-lateral (ML) and antero-posterior (AP) directions, and shank angular velocity. Shaded areas represent the APA phase.