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TheRaceClub:Swimming Tips_Hands游泳技術提示:手部

你知道手入水,手指該合起來還是分開?分多開? 應該游泳的人大部分都有這個疑惑吧?


The Race Club Tip- How to Position Your Hands Underwater

The Race Club教練說: 手指不要緊黏在一起,稍微分開當水流過形成湍流(turbulence),使你手作用比原先還大,但若分太開,水就只是流過去。


Have no idea how Wide is too Wide ? Take a look at the data.

不同指間距產生的渦流對照圖

. Flow visualization on a horizontal plane located at mid-finger level, at a water speed of 2.5 m/s, at the closest (left), optimum (middle) and widest (right) finger spacing.

Flow visualization at a water speed of 2.5 m/s, at the closest (left), optimum (middle) and widest (right) finger spacing
Phtot Credits: www.posetech.com

Page 90 of Swimming Propulsion Forces Are Enhanced by a Small Finger Spread

左圖是取自一篇論文,有興趣的可以下載來看。 基本上看實驗結果,如果阻力,升力,手的角度一起考慮,最好的是0.32cm


Rebecca IMHO:
★我想手動作的速度也是因素吧,若速度太慢,水應該也只是流過指間,不易形成湍流(turbulence)來加大手的作用。 如果試把手掌稍伸出車窗外,車速不同,應會感到阻力不同吧,不過請注意安全!
水密度約空氣800倍(from Wikipeida),在水中手動作不需像車速那麼快,應就能感覺了。
另外手的形狀,如手指粗細,也會影響湍流(turbulence)形成,如果你7歲就學游泳跟你轉大人後,我想最佳手指分開的距離應會不同。

我的結論是:實驗數據是在特定情形下的結果,個人條件還是有差異,自己不要一成不變,可以試試不同的手指距離,找到自己最合適的姿勢,自己對水的感覺非常重要,不管對的錯的動作,水都會給你回饋,你只要去察覺它告訴你什麼,照水的指示改進,就會進步了。

還有你可能覺得The Race Club教練的手指分的超開,不過他訓練的都是體格壯碩,大手大腳,速度快的歐美選手,所以手指距離比起實驗的 0.32cm 看起來大的多。 如果有不同想法,歡迎留言交流分享一下。


Video: www.theraceclub.net
Document: Swimming Propulsion Forces Are Enhanced by a Small Finger Spread
Journal of Biomechanics 42 (2009) 2188–2190 – The optimum finger spacing in human swimming

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About Rebecca

A pretty lazy human being ! Lazy to do any boring stuff.

Discussion

2 thoughts on “TheRaceClub:Swimming Tips_Hands游泳技術提示:手部

  1. 對啊,以前我就問過別人,有人說 要分開,也有人說放清松並攏…原來是0.32公分..不過速度因子真的很重要. 若沒有速度.則顯得在水裡很笨重吃力,我覺得任何式都需要有相當的速度,除非在改姿勢. 謝啦 很完整的解答…

    Like

    Posted by coco | April 17, 2012, 11:54 am

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