标题: 自由泳手的入水----STR 一起探讨吧 [打印本页] 作者: 快乐悠悠 时间: 2012-5-7 01:43 标题: 自由泳手的入水----STR 一起探讨吧 The typical and ineffective arm position at the completion of the entry is shown below in the left image. Note that the arm is parallel to the surface.
This position is ineffective because:
the leverage is very poor,
time is wasted,
there is unnecessary stress on the shoulder.
该贴已经同步到 life的微博作者: 快乐悠悠 时间: 2012-5-7 01:43
Swimmers generally position the arm parallel to the surface (as shown in the left image). This position usually requires about .2 sec before the arm submerges below the shoulder to a position of better leverage where greater force can be generated (right image). More importantly, the angle at the shoulder (left image) reduces the space between the upper arm and shoulder causing irritation and decreased blood flow - a position classically related to “shoulder impingement."
在这个位置你的手臂要进入杠杆作用大,能产生较大力量的位置需要花0.2秒。更重要的是,水平的手臂位置导致上臂和肩膀间空间变小,会导致不适和阻碍血液的流动,这是肩膀出现伤病的一个重要原因。 作者: 快乐悠悠 时间: 2012-5-7 01:44
The right image shows a more effective position at the completion of the arm entry. The leverage is improved so the swimmer can immediately begin to generate substantial force. Because the wasted time is eliminated, the stroke rate increases. Best of all, shoulder stress is greatly reduced.
作者: 快乐悠悠 时间: 2012-5-7 01:44
An effective arm position can be achieved by a downward entry angle. If the elbow is maintained above the hand and the hand enters at a 30o angle, the arm will be in an effective position at the completion of the entry (as shown below).