Exercise accelerates blood circulation, and the functions of various organ systems are also enhanced, and reproductive organs are no exception. After exercise, the blood flowing through testis, prostate and seminal vesicle increases. With the increase of semen, the number of nocturnal emission will also increase.

After physical exercise, the reflex activity of central nervous system and the function of autonomic nerve will also be enhanced, and the excitability of erectile center will increase, which will easily cause sexual nerve reflex, lead to congestion of sexual organs and sexual impulse, so nocturnal emission will occur.

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Some young men wear tight-fitting sportswear, or because of the stimulation, friction, excessive fatigue and warm quilt cover after exercise. Long-term use of some sports equipment can also induce sexual impulses and cause nocturnal emission.