Abstract
The purposes of this study were to measure the ground reaction force in service ball bound and to investigate the index for the performance of tennis serve. To perform these purposes, following results were performed; 1) The ground reaction force of the ball and the rotary torque when a serviced tennis ball bounced were measured using a force platform. 2) For one of this result, about 350N of ground rection force toward vertical direction were confirmed. Furthermore, ground reaction forces of female subjects in this study were between from 200 to 300 N. And these of male subjects were between 350 to 500 N. 3) Ground rection force to the vertical direction will be the power of the service, and it may be the parameter to evaluate a service performance (without the unit) of no dimension until now. These results can be hopeful to the general performance evaluation of the service performance. 4) It is thought to e important to construct the experiment setting that it becomes the becomes the environment that is near (the measurement) by the real condition in future.
