Too much distance work can convert fast twitch muscle fibres into slow twitch fibres and can actually decrease an athlete's speed over time.
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。
After about two weeks of taper, fast-twitch muscle fiber shows greatly increased muscle power, contraction speed and force.
在恢复的两周后，快速收缩肌肉纤维显示显著增强了肌肉能量，收缩速度以及力度。
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