抄録
We investigated the effects of ballet training on the stability limits (SL) of 4 directions and body sway while standing at SL by the data of center of pressure (COP), and also analyzed COP of each foot at SL. Subjects were 7 female ballet dancers and 7 female non-dancers. Subjects Stood barefoot on two force plates and leaned voluntarily to forward, backward, rightward and leftward limits without bending their trunks and necks. There was no difference of SL and COP sway at SL between the two groups in any directions. At backward SL, COP of each foot moved significantly inward, and lateral COP sway was significantly larger than at forward SL. At rightward and leftward SL, COP of each foot moved significantly outward, and COP sway of the opposite foot to the leaning direction was significantly larger than that of another foot. In conclusion, 1) ballet training does not affect SL and body sway at SL, 2) postural control is more difficult at backward SL than at forward SL, and 3) the opposite foot to the leaning direction might have a role of assistance to postural control while standing at rightward and leftward SL.
