Abstract
The purpose of this study is to compare the differences of running styles, Rear-foot strike (RFS) and Fore-foot strike (FFS), concerning the parameters of the vertical mathematical model and propose effective running style. The ground reaction forces are measured by force platform under two types of running style with various velocities ranged from 2.23 m/s to 4.46 m/s. A unique set of parameters of the model for each trial is computed by nonlinear programming to minimize the sum of the relative standard error of ground reaction force and the relative error of rebound velocity. The differences of the running styles were considered by using results from parameters of multi-degree of freedom model. The results of this study indicate that although the FFS needs much energy than that of RFS in low speed running, the FFS needs less energy than that of RFS in high speed running because of the impulse as the internal forces that is calculated by a set of parameters of multi-degree of freedom model.
