endorphin

When this happens, stress and pain occur, causing endorphin levels to rise in the brain..在该情况下，紧张和疼痛向大脑反馈，从而增加的内啡肽的释放。

Whereas exercise has a positive impact boosting self-esteem, sense of control and endorphin levels..但是，锻炼却有助于提升自信、自控力以及调节脑内啡水平（一种荷尔蒙），跑步者的愉悦感（runner's high）是指当运动量超过某一阶段时，体内便会分泌脑内啡。

If the scans showed that endorphins were being produced and were attaching themselves to areas of the brain involved with mood, that would be direct evidence for the endorphin hypothesis..如果扫描仪显示内啡肽产生并在他们与情绪有关的脑区发生作用，那么就能直接证实内啡肽假设的真实性。