The Analysis of Changes in Throwing Task's Movement Pattern Derived by Practice

Abstract

We investigated the changes of the kinematic parameters of the target oriented motor task through practice in order to analyze the influences of the practice on the structure of the changes in the multijoint movement pattern which had opened task characteristics. Angular displacements and muscular activities of throwing movements on sagittal plane attempted by four healthy males participated in this study were measured. Standard Deviation of the values which indicated coordination between elbow and wrist joints decreased due to the practice. Angular displacements and velocity of the elbow joint increased as the practice proceeded. Correlation Coefficient of angular velocity between the joints increased due to the practice, and that of angular displacements between the joints decreased. However, we couldn't conclude what general principles of the change of motor pattern in the throwing task were.