As an ordinary person, I believe many people have been told by their parents and teachers not to do one thing: don't take a cold bath or drink cold water after strenuous exercise. The general reason is that after strenuous exercise, the skin and blood vessels will expand. Taking a bath with cold water immediately will make the skin and blood vessels expand rapidly, which is easy to catch a cold and even harmful to health. But this common sense is now facing an "unprecedented challenge", because it is very popular for athletes to enter the liquid nitrogen freezer for physical therapy after the competition in foreign countries.

Senior sports fans should note that nowadays, foreign athletes have begun to popularize a kind of liquid nitrogen cryotherapy, that is, after the game, athletes will enter the liquid nitrogen freezer for physical therapy for about 2-3 minutes. This phenomenon is very common among NBA players, and top athletes such as Cristiano Ronaldo and Floyd Mayweather have begun to experiment with liquid nitrogen cryotherapy.

Why do athletes like to put themselves in the refrigerator after the game? It's liquid nitrogen at MINUS 200 degrees. It won't hurt. As the name implies, liquid nitrogen is liquid nitrogen. Since the boiling point of nitrogen is-196.56℃ and the melting point is -209.8℃, the temperature of liquid nitrogen should be around -200℃ under normal pressure. The average person stays in a liquid nitrogen facility at MINUS 200 degrees Celsius for 2-3 minutes, but taking a cold bath after strenuous exercise may be harmful. Are athletes really so different from ordinary people?

The answer is of course no! This is because the liquid nitrogen in the explosion chamber will not directly contact with the human body. To be exact, it is not the liquid nitrogen itself that gives athletes cryotherapy, but the low-temperature atmosphere produced by the evaporation of liquid nitrogen, which is acceptable to the human body. The reason why athletes need liquid nitrogen treatment after the competition is that liquid nitrogen can help them recover. As we all know, whether in the boxing ring, football field or basketball court, athletes will inevitably have physical conflicts, and bumps are also inevitable. In order to relieve swelling and pain, athletes usually choose ice compress. The principle of liquid nitrogen refrigeration equipment is similar to ice compression, which can help athletes relax their muscles and kill lactic acid produced by strenuous exercise. This can make athletes' muscles recover quickly and become healthier.