More exercise for men is not better

　　The researchers will healthy young boy (average age 19 years old) were divided into two groups. One group had to ride a special bicycle for 8 hours over two weeks to the point of exhaustion, while the other group avoided participating in overly strenuous exercise. The experiment found that the boys in the exercise group had sperm concentration, once ejaculation The amount and other sperm quality indicators have declined. And their follicle-stimulating hormone and luteinizing hormone levels also drop.

　　The researchers also found that two or three days after training, the athletes' hormone levels, sperm count and quality returned to normal levels. However, for older people, recovery is not as fast.

　　Experts point out that the brain, pituitary gland and testicles interact to control reproduction, and exercise may interfere with this system. Their next step will be to study the effects of exercise on those with low sperm counts and low sex hormone levels. male How much impact does fertility have.

　　Researchers are also right female The above-mentioned tests were carried out. They found that women who exercise frequently and strenuously can also have significant effects on sex hormone levels, such that they may stop menstruating. But there is no evidence that they diminish reproductive capacity in the same way as men.

　　Therefore, all exercise must be done in moderation, more is not always better.