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Science:游泳时手指伸开会游得更快?

摘要 : 在顶级的游泳比赛中,百分之几秒便足以改变一切。一项在日前于俄勒冈州波特兰举行的美国物理学会流体动力学分会第69届年会上展示的研究表明,通过简单地张开手指,人们可节省一部分时间。

 

在顶级的游泳比赛中,百分之几秒便足以改变一切。一项在日前于俄勒冈州波特兰举行的美国物理学会流体动力学分会第69届年会上展示的研究表明,通过简单地张开手指,人们可节省一部分时间。

物理学家利用3D打印的塑料手臂模型,分析了5个不同的手指位置对游泳速度造成的影响:中指、食指、无名指和小拇指分别张开0°、5°、10°、15°和20°。在所有情况下,拇指的位置保持不变。研究人员在风洞而非泳池中测量了其模型受到的阻力,以避免表面波浪的影响。他们发现,手指张开10°的模型产生了最多阻力,因为手指间的稍微张开仍然阻碍了空气流动。由于更多阻力会为游泳者提供更多推力并且推动其前进,该团队推断,当自由泳运动员将手指稍微张开时,会产生最佳效果。

研究人员根据对手掌大小和划水频率作出的假设计算得出,和在游泳时手指握紧相比,张开10°的手指可让游泳者的速度提高2.5%。在50米自由泳比赛中,这种速度上的差异可转化成十分之几秒。这是一种巨大的差异,考虑到2016年夏季奥林匹克运动会女子50米自由泳比赛的冠军仅以0.02秒胜出。

原文链接:

Want to swim fast? Spread your fingers

原文摘要:

In elite swimming competitions, hundredths of seconds make all the difference. And by simply spreading your fingers, you can shave some of that time off, according to a study presented here last week at the 69th Annual Meeting of the American Physical Society Division of Fluid Dynamics. Physicists used 3D-printed plastic hand and arm models to consider the impact of five different finger positions on swim speed: pointer, index, ring, and pinkie fingers spread by 0°, 5°, 10°, 15°, or 20°. (In all cases, the position of the thumb was held constant.) The researchers measured drag over their model in a wind tunnel rather than a pool to avoid the influence of surface waves. They found that the model with its fingers spread 10° created the most drag because the slight opening between the fingers still obstructed air flow. Because more drag gives a swimmer more to push against and propel him or herself forward, the team concluded that freestyle swimmers were the most efficient when they spread their fingers slightly. Making assumptions about hand size and stroke rate, the researchers calculated that a finger spread of 10° could boost a swimmer’s speed by 2.5% compared with swimming with fingers held together. That speed difference translates into several tenths of a second over a 50-meter freestyle race, an enormous margin considering that the 2016 Summer Olympics 50-meter women’s freestyle race was won by 0.02 seconds.

来源: Science 浏览次数:0

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