criteria for participation were 1 ) diagnosis of parkinson 's disease , 2 ) physician-documented rigidity , 3 ) ability to follow one-step verbal directions , and 4 ) ability to attain at least 75 % of the standard passive-range-of-motion measurements of the elbow , forearm , and wrist of the tested upper extremity .
C0016536
forearm
C1140618
upper extremity