Suggestion in advanced turn skill for competitive swimming

旨在为一些高级的转弯技巧提供建议。测量了流线姿态和滑行速度。在快速转弯中，头部在旋转阶段的轨迹近似于椭圆形。在开转运动的旋转阶段，测量了头部离水面的高度。结果如下：(1)通过肩带的活动来抬高肩膀，并使三角肌在耳朵上活动的流线姿势，在滑行速度上倾向于高。2)在翻滚转弯时，头部椭圆轨迹在旋转阶段长轴坡度较浅，短轴坡度较短，则转弯性能较高。3)在开式转弯中，如果头部轨迹接近水面，则旋转阶段所需时间较短。这些都被认为是提高竞技游泳转身技巧的因素。

It was aimed for suggestion in some advanced turn skills. A stream-line posture and glide speed were measured. As for the trajectory of the head during the rotation phase in the quick turn, it was similar to an oval. The head height from the water surface was measured during the rotation phase in the open-turn movement.Results were obtained as follows; 1) The stream line posture that raised shoulders by the mobility of the shoulder girdle, and that put the deltoid muscles on the ears, tended to be high in glide speed. 2) In the tumble-turn, if the oval trajectory of a head during the rotation phase had shallow slope of the major axis and short minor axis, a turn performance tended to be high. 3) In the open-turn, if the trajectory of head was near to the surface of the water, the time required was shortfor the rotation phase.These were suggested as factors of an advanced turn skill for competitive swimming.