Abstract
[Purpose] The purpose of this study was to compare the reaching velocity of the upper trunk and the center of force (COF) during a reaching task with the dominant and nondominant hands. [Subjects] Ten males between the ages of 20 and 30 years participated in this study. [Methods] This study measured the reaching velocity, upper trunk movement, and center of force movement during a reaching task using the dominant and nondominant hands. [Results] There was no significant difference in reaching velocity between the dominant and nondominant hands in the reaching task. The forward movement of the upper trunk and COF movement in reaching with nondominant hand were significantly decreased compared with those of the dominant hand. [Conclusion] Therefore, when evaluating the reaching performance of patients clinically, it is necessary to evaluate trunk movement, reaching velocity, and the subsequent movement of the body center.