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So they can contract more slowly, but can keep going without burning themselves out.
所以，慢收縮肌肉纖維收縮更慢，但是持續時間更長。
Right, slow-twitch fibers have a lot of myoglobin, a protein that helps transfer oxygen into the mitochondria, the power houses of the cell that produce cellular energy.
慢收縮肌肉纖維含有大量的肌紅蛋白，這是一種幫助氧氣進入線粒體的蛋白質，線粒體是細胞產生細胞能量的能量屋。
So marathon runners must have a lot of slow twitch muscle fibers.
那么，馬拉松選手肯定有很多慢收縮肌肉纖維了。
Exactly, since they have to keep going for long periods.
說的對，因為馬拉松耗能耗時長。
So, sprinters must have a lot of fast-twitch muscle fibers.
所以，短跑運動員必須有很多快速收縮的肌肉纖維。
Right! Fast twitch fibers consume energy quickly and are good for short, powerful bursts of movement like sprinting and jumping.
對，快收縮肌肉纖維耗能快，特別適合短而有力的爆發性動作，比如短跑和跳躍，
World-class sprinters typically have about 80% fast twitchmuscle fiber.
世界級短跑健將體內80%肌肉都是快收縮肌肉纖維。
Luck dogs!
真是幸福!
And, of course, they train incredibly hard to develop their natural gifts. Olympic gold is not won by muscle fiber alone.
當然，他們不僅僅靠天賦，還有艱苦地訓練來完善技能。獲得奧運金牌可并非肌肉纖維就可以。
But it certainly helps!
但是不得不承認肌肉纖維起了作用。
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