Abstract
The purpose of this study is to reveal the control properties of the voluntary single hand rhythmic movement from the viewpoint of the variability aspects for frequency and amplitude. Twelve subjects (age: 20-24yrs.) participated in three experimental conditions: Preferred pace (pP), Maximum-pace (maxP), and Pace-up (Pu) conditions. Coefficients of variation (CVs) were used as variability measures for frequency and amplitude. The CVs for frequency and amplitude indicated similar deviations at slow rhythmic movement rates. Though the amplitude CVs gradually increased as the movement rates increased, the frequency CVs remained invariant. The results of these experiments indicated that frequency was the control parameter in the rhythmic movement. In addition, it was also found that the amplitude CVs began to increase at approximately 1.24Hz.
