The method of bathing and soaking the body with alternating hot and cold water is called hot and cold bath, which has a strong value of exercising the body, and is different from cold bath and winter swimming, so that the body is exposed to hot and cold water alternately, rather than simply exercising the ability to withstand cold. The alternating stimulation of hot and cold causes the blood vessels to shrink one by one, thereby increasing the elasticity of the blood vessels and the tolerance to stimulation, improving the blood circulation and nutritional status of the body, so that metabolites, pain-causing factors, inflammatory mesons and undesirable components that are easy to be deposited on the blood vessel wall and intima to form atherosclerotic plaques are discharged with blood perfusion.
Theoretically, hot and cold baths should start from a young age, and those whose blood vessels have hardened or even been obstructed are no longer suitable, just as most of the elderly who carry out winter swimming exercises, hot and cold baths can also be "carried out by feeling the stones", and middle-aged and elderly people can also try. People who rely on lipid-lowering drugs and aspirin to prevent hardening of the arteries may wish to take a hot and cold bath, which is purely physical and natural**.
Method: first cold and then hot, the cold water temperature should be 12 -16, the hot water temperature needs to be adjusted to 40 -44, each time it lasts two to three minutes, the whole process alternates 5 to 1 times, and finally should end with a hot bath. Note: If you are older or have poor physical fitness, it is not advisable to use cold water with too low temperature, and it is recommended to use this method after consulting a doctor.