The participants either hummed one note or sang a hymn while breathing whenever they wanted.

这十五名参与者或者是哼一声，或者是唱个小曲，而呼吸则不受控制。

So the next time you feel your heart racing sing a song or just hum a note and let your own wanderer nerve restore calm.

所以，下次当你感到心跳加速时，唱首歌或者哼个音调，让自己的迷走神经恢复平静。