フィギュアスケートに見られる前庭脊髄反射

―回転運動における半規管の役割―

抄録

The relationship between the direction of rotation and the leg supporting the body in figure-skating was thought to be based on the cristo-spinal reflex. Skaters stand or jump with the leg of the same side as the rotation when turning around a vertical axis. This suggests that the movement of endolymphatic fluid towards the ampulla of the ipsilateral horizontal semicircular canal as the direction of rotation exerts a facilitatory action on the extensor neurons. On the other hand, they land on the ice with the opposite leg after turning in the air. This can be interpreted as a phenomenon similar to postrotatory nystagmus; that is, the ampullopetal flow takes place in the semicircular canal opposite to the rotation after cessation of turning, resulting in activation of this canal.