太多的长途运动会造成快肌纤维转换成慢肌纤维，并随着时间的推移，逐渐减慢运动员的速度。
Too much distance work can convert fast twitch muscle fibres into slow twitch fibres and can actually decrease an athlete's speed over time.
我们每个人有两种基本的肌肉纤维，慢抽搐和快抽搐肌纤维。
We have two basic types of muscle fibers, slow twitch and fast twitch.
在这样的肌肉中有一部分肌纤维兼受快肌和慢肌两种神经支配。
In such muscles there were a proportion of muscle fibres doubly innervated by both fast-and slow-muscle nerves.
在这样的肌肉中有一部分肌纤维兼受快肌和慢肌两种神经支配。
In such muscles there were a proportion of muscle fibres doubly innervated by both fast-and slow-muscle nerves.
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