Many people like swimming in winter. Why do they insist on swimming in winter without fear of catching a cold?

Speaking of winter swimming, many people think that swimming in winter will be very cold and easy to catch a cold. But in fact, winter swimming is not directly related to colds. Only people with poor immunity will lose their immunity after encountering cold, thus causing a cold. People who often swim in winter, even if their legs are placed in low-temperature water for a long time, have less diffuse vascular reaction. Although the capillaries of the nasal mucosa will begin to contract, after 30 seconds to 1 minute, the original contracted capillaries will expand again, and after cold stimulation, the body will immediately generate a lot of heat to supplement the lost heat, and the nasal mucosa itself will be strengthened by long-term low-temperature exercise, even if the blood supply is reduced, it will not allow viruses, bacteria and other microorganisms to easily invade. Therefore, people who often take part in winter swimming are not easy to catch a cold and have many benefits.

First, enhance the elasticity of blood vessels. Winter swimming is carried out at low temperature. Cold water will directly stimulate human skin, causing pores and subcutaneous blood vessels to contract sharply under the command of nerve center, and a large amount of blood will squeeze into viscera and deep tissues, and visceral blood vessels will expand. Then, under the action of the heart, a lot of blood will flow from the internal organs to the body surface, and the subcutaneous blood vessels will expand again. After continuous contraction and expansion, the elasticity of blood vessels is effectively enhanced, delaying vascular sclerosis.

2. Prevention and treatment of cardiovascular diseases Winter swimming improves the body's lipid metabolism, enhances the dissolving activity of lipase and fibrinolytic enzyme in blood, reduces and decomposes the contents of low-density lipoprotein and triglyceride in blood, and reduces the deposition of hardened plaques on blood vessel walls. Physical activity of relaxing blood vessels can not only increase blood flow, but also effectively wash away cholesterol and fat deposits attached to blood vessel walls, prevent thrombosis, and effectively prevent cardiovascular and cerebrovascular diseases such as myocardial infarction, angina pectoris and hyperlipidemia.

Third, enhance the body's resistance to winter swimming. Cold water will stimulate capillary contraction, improve subcutaneous blood circulation, ensure adequate nutrition of the skin, thicken the cuticle outside the skin, increase the skin's resistance to the outside world, and prevent the invasion of bacteria. Long-term adherence to winter swimming will enhance people's nervous system function, improve the thermoregulation function of nerve activity, strengthen nerve dominance and adaptability, and increase the body's resistance.