This study used three-dimensional motion analysis to determine the motion of rotational shot put. We sought to elucidate the effect of over-rotation in rotational shot put. The results showed that dirction of the center of gravity of the body (CG direction) correlates with the angular momentum of the shot-and-thrower system. As the magnitude of variability of CG direction relative to the horizontal plane increased, angular momentum of the shot-and-thrower system relative to its vertical axis decreased at the second turn @ < 0.05). CG direction showed a strong dependence on the contact position of the foot. We suggest that throwers avoid over-rotation by placing the foot straight from L-off to Lon.
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