Winter swimming can be divided into four levels: the starting point of winter swimming is 17℃; The temperature of the water is 8℃ as a sign of the cold degree of winter swimming. The water temperature below 17℃ gives people a cold feeling, and below 8℃, there are cold, numbness, strong cold stimulation feeling. Winter swimming can enhance the cardiovascular function. After the human body is stimulated by cold water, the blood circulation and metabolism of the whole body are greatly strengthened; Human skin is stimulated by cold water, the skin blood vessels shrink sharply, a lot of blood is sucked into the internal organs and deep tissues, so that the blood vessels of the important internal organs are dilated; In order to resist the cold, the skin blood vessels quickly dilate, so that a lot of blood flow from the internal organs to the surface. Such a characteristic contraction, so that the blood vessels get exercise, enhance the elasticity of the blood vessels. Therefore, winter swimming is beneficial to the prevention and treatment of cardiovascular diseases, in the perennial winter swimming exercise, atherosclerosis, hypertension and other people are extremely rare.
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