Abstract
This study aims to reveal the effect on motion and ground reaction force of presence of selective reaction in changing direction while running. The participants were instructed to make directional changes on a force plate on two conditions (With an advance instructions, or without). The motion was then studied by using three-dimensional motion analysis and force plate data. According to the results, the average value of all subjects had no significant trend. On the other hand, there are individual differences in the effect of giving instruction before trial Thus, that made difficult to see a clear trend in all subjects by these variations affect each other.
