职业运动员日益增加，彻底改变了这项运动。

Increased professionalism has changed the game radically.

《牛津词典》

两组运动员的心脏大小总体上都有明显的增加。

Both groups had significant overall increases in the size of their hearts.

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不过，最显著的功能性差异在于心跳之间的心肌放松——耐力运动员的心肌放松增加了，而力量运动员则减少了。

The most significant functional differences related to the relaxation of the heart muscle between beats - which increased in the endurance athletes but decreased in strength athletes.

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