为什么要使用直臂移臂

时间:2019-07-26 来源: 厦门新闻

The freestyle technique of the straight arm shifting arm is somewhat controversial. I have found that some coaches either believe that using this technique may be more likely to cause shoulder problems, or that young swimmers are not strong enough to use the straight arm arming technique.

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I have not found any evidence that these two concepts are true. We advocate the use of straight arm booms in the 50m freestyle and in the end of all freestyle (including medley) matches. If the swimmer is particularly comfortable using a straight arm, we also consider using this technique in the 100m freestyle.

By straightening the arm, the amount of work required for the swimmer to move the arm over the water is increased by a factor of four. The only reason swimmers make moving their arms more difficult is to get more power and speed. This is especially important in short distance races. The extra energy and speed of the straight arm arm are obtained by what we call a coupling process. The increased kinetic energy of the straight arm shifting arm increases the propulsion of the stroke and kick.

If you watch Nathan Adrian's 100m freestyle, you will see his last 8 meters moving from a high elbow to a straight arm, which increases the speed and frequency of the stroke. Compared to any swimmer I remember, Nathan has won more gaps in the game. He was the most famous match in the London Olympics 100m freestyle final.

Although some well-known swimmers use straight-armed freestyle techniques (Janet Evans, Leah Smith, Lotte Fries) in longer races, they are known for their strong professionalism. It is one thing to increase the arm movement by 30 seconds, and keeping the high-intensity arm within 15 minutes is another matter.

The vast majority of shoulder problems are tendinitis or impact problems, which are mainly caused by overtraining. Since we are advocating the use of this technique in short-distance sprints, we have not seen the possibility of causing any type of shoulder problems, especially when done correctly, as long as the training duration and distance are shorter.

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使用直臂移臂自由泳技术的正确方法是采用更垂直的手臂移臂,而不是将直臂摆动到侧面。有三个主要原因。首先,垂直移臂技术要求游泳者将身体进一步转动到每一侧以便于移臂。在这个身体旋转位置,移臂时肩部撞击的可能性要小得多。其次,增加的身体旋转也为耦合增加了显着的动能,为划水增加了更多的动力。第三,从更垂直的位置,手臂在向下的路径上受到重力的辅助,导致更有力的手臂入水和更大的耦合力量。入水时手臂和手的速度越快,划水臂的推进力就越强大。

所有仰泳者都使用直臂移臂。1936年奥林匹克运动会的Adolph Kiefer(他以1: 08获胜)是最后一位成功使用曲臂移臂的精英仰泳选手。在仰泳中使用曲臂移臂会导致严重的力量损失。

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这引出了一个问题,“为什么不是所有的自由式运动员都使用直臂移臂?”我相信答案与解剖学有关。如果我们在后方伸展我们的手臂,像我们可以在前方一样容易,我们可能会看到所有自由泳选手都会使用直臂移臂。我们的肩部限制使得使用直臂移臂更具挑战性。

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