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. Author manuscript; available in PMC: 2016 Oct 19.
Published in final edited form as: J Nat Sci. 2016;2(8):e201.

Figure 3.

Figure 3

Representative joint position and EMG tracings of the wrist flexors and extensors from a subject with Parkinson’s disease during the wrist extension movement at 50°/s with 60° range of motion. In the OFF-MED condition (A), a shortening reaction was observed in the extensors while a stretch reflex was recorded in the wrist flexors. Dopaminergic medication greatly diminished the amplitude of these phenomena in the ON-MED condition (B). The onset of movement is indicated by the vertical line. Top panel: joint position (°); middle panel: average EMG of wrist flexor muscles; lower panel: averaged EMG of wrist extensor muscles.