A mechanism of body orientation change at the approach phase to curved path in sprinting

The purpose of this research was to clarify a mechanism of body orientation change at the approach phase to curved path in the sprinting event such as 200m or 400m. As a result, the authors revealed that the direction of the runner’s velocity already changed before the curvature. Then, once runner’s trunk leans, the runner’s trunk is oscillating with more than 90 degrees inclination angles. Because the moment about x axis which is corresponding to the anteroposterior axis acted on opposite direction at the stance phase of left and right ground contacts.