Endorphines and enkephalins are names given to these neurotransmitters.

内啡肽和脑啡肽类便是这类神经递质的名字。

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Overall, an increase in the brain's production of endorphines occurs when the body is put under stress such as long distance running, and the endorphines then cause a positive or negative mood change.

总之，身体在紧张感下，比如长距离的奔跑，会增加内啡肽的分泌量。而内啡肽会令人产生情绪的变化，有正面也有负面的情况。

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