ABSTRACT
The purpose of this study was to investigate the controllability of several pursuit movements of the arm muscles. Three subjects in a sitting position were studied for elbow flextion and extension. Three wave forms (sinusoidal, sawtooth and rectangular) on VDT were followed by the subjects, and 5 work loads were given at 0.3 Hz frequency.<BR>The following results were obtained.<BR>1. There was phasic delay in the order: sinusoidal (-10°), sawtooth (-15°), rectangular (-20°) .<BR>2. An overshoot phenomenon was observed for each wave form during the flexion phase at a work load under 10% of the maximum strength. At a work load of over 10% of the maximum strength, an undeshoot phenomenon was observed.<BR>3. With regrd to controllability, the error area increased in the order: sinusoidal (4-7%), sawtooth (6-12%), rectangular (15-25%) .<BR>4. There was a significantly smaller EMG output from antagonists during both the flexion and extension phases at workloads of 4 and 8 kg.