The main principle is that the pressure generated by compressing underwear helps to accelerate the blood flow to the heart and reduce the heart rate (some experiments show that it can be reduced by about 0.8bpm, source: landing page), just like a person soaking in a swimming pool, the pressure of water on the body will reduce the heart rate. Therefore, everything related to accelerating blood return to the heart has become the advertised benefits of compression clothing, such as improving the oxygen supply rate of blood to muscles, accelerating the decomposition of lactic acid, reducing swelling, accelerating recovery and so on. But the actual effect is not clear, mainly depending on personal subjective feelings. The most obvious thing is that in an endurance race, players with or without clothes have no obvious advantage.
Author: Zhao Fan
Link:/question/24645303/answer/28510591
Source: Zhihu.
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Precautions for tight jeans
Wear tight jeans during the day and tight underwear at night. Should teenagers wear it? Let's talk about the developmental characteristics of testicles first.
In the embryonic stage, the testis is located behind the peritoneum and the scrotum is not formed. At birth, the scrotum forms and the testicles descend into the scrotum. Why don't testicles hide in the body like ovaries, but hang outside the body? Because the testis is suspended in the vulva wing, the temperature there is lower than that in the body 1.5 ~ 2.5℃. That temperature is conducive to the normal development of testis. If the testicles haven't dropped into the scrotum after the baby is born, it is called cryptorchidism. Because the testes of cryptorchidism patients are in the internal temperature environment, the tissues that produce sperm in their testes cannot develop normally.
Experiments have proved that if the temperature of animal testis is artificially raised, the sperm produced by testis will undergo tissue degeneration. If you wear tight jeans that are not easy to breathe, squeezing your testicles and shadow neck tightly on the crotch wall is not equal to artificially heating your testicles! In addition, the volume of testis and shadow neck increases rapidly during adolescence. The volume of adult testis is 17 ~ 50 times that of prepubescent testis, and the volume of adult shadow neck is 10 ~ 14 times that of prepubescent children. If you add a "spell" to them, won't it hinder their growth? It is true that young people look handsome in jeans, but the price he can pay is also high. Whether he should wear jeans or not, please ask his adolescent friends to worry about it themselves.
It talked about the influence of jeans on the development of reproductive organs. What effect does wearing tight underwear at night have on the development of reproductive organs? First, it will have a similar effect to wearing jeans. Secondly, I want to talk about the state of the shadow neck. During the day, due to intense study and other activities, coupled with the limitation of sexual morality, the stiff nerves of mute erection are suppressed after the cavernous body is congested, and mute is in a weak state. At night, after the brain is in a state of full rest, the nerves that make the silent erection are often released, thus making the silent erection wave by wave. Silent nocturnal erection indicates that its development is normal. Wearing tight underwear will limit the erection of the vulva neck and easily cause frequent nocturnal emission.
If it is in the form of nocturnal emission, it is completely normal physiological phenomenon and can be ignored. But if frequent nocturnal emission is caused by human factors, it is not normal. Frequent nocturnal emission can cause insomnia, dizziness, fatigue, listlessness and other symptoms, affecting study and normal life, and may also cause a certain psychological burden. Then, whether adolescent friends should wear tight underwear at night also needs your careful consideration.