To put it simply, taking a cold bath has three advantages. First, it increases the adaptability of human body to temperature, especially to cold air, and it is not easy to catch a cold. Second, it is good exercise for human blood vessels. When taking a cold bath, the blood vessels contract rapidly, and a large amount of blood flows to the inside of the body and then to the body surface, and the blood vessels expand and contract. In the long run, it can prevent cardiovascular diseases. Third.

Hazard: Different personal constitutions will lead to different diseases.

Matters needing attention in taking a cold bath .....

Take a bath every day in summer. Many people take a cold bath to save trouble, and some people take a cold bath to keep fit. Cold water bath has many functions. For skin, it can make blood vessels contract first and then expand, improve blood circulation efficiency, enhance skin nutrition, make subcutaneous tissue accumulate certain fat, and make skin look young and elastic, and it is not easy to suffer from skin diseases. Cold water bath can exercise skin temperature receptors and eliminate abnormal sweating. For the whole body, cold water bath can improve the body's rapid adaptability to cold, and it is not easy to suffer from cold-induced diseases such as cold, bronchitis, tonsillitis, pneumonia and allergic rhinitis. Cold water bath promotes blood circulation between skin and viscera. The expansion and contraction of blood vessels exercise the elasticity of blood vessels, which can prevent arteriosclerosis and its diseases, such as coronary heart disease and hypertension. Cold water bath increases the blood flow of visceral blood vessels, including digestive tract blood vessels, thus strengthening the function of digestive system. When cooling with a cold water bath, it is not advisable to suddenly immerse in cold water at first. It is best to splash some cold water on your body with your hands or shower head, or wet your hands and feet with cold water first, and then wet your chest and back with a towel. Rub your body for a while, cold water will soak you through and dry quickly until your skin turns red, which means the effect is good. If you feel cold, you should shorten the shower time or raise the water temperature.

The following kinds of people should not take a cold bath.

(1) Patients with hypertension: When the skin comes into contact with cold water, the blood vessels contract sharply, and a large amount of blood rushes back to the internal organs, making the already high blood pressure even higher. In severe cases, it can cause cerebrovascular rupture, bleeding, stroke, coma and even death. People with slightly elevated blood pressure can take a cold bath, but only slowly, that is, sprinkle some cold water first and rub some parts of the body instead of "cold treatment" at once.

(2) Patients with sciatica and arthritis: After the nerves catch cold, the condition will be more serious.

(3) People who are allergic to cold, such as patients with cold urticaria and pruritus, should not take a cold bath during the onset. If you want to exercise your skin when you don't have an attack, it is feasible to gradually cool down, that is, take a hot bath at first, gradually switch to a warm bath, and then gradually lower the water temperature until the water temperature is quite low but you don't get sick.

In hot weather, many people have the habit of taking a cold bath. Modern medical research has proved that cold water bath is a simple and effective fitness method. Cold water bath is to stimulate the human body with cold water below the body surface temperature, and enhance the metabolism and immune function of the human body. The number of lymphocytes in people who exercise in cold water bath is significantly higher than that in people who don't exercise. In addition, cold water can stimulate the body to generate more heat to resist the cold, and therefore consume the heat in the body, so that it is not stored as fat, thus making people healthy.

There are generally three reaction periods for taking a cold bath: the first is a cold period, the second is a warm period and the third is a cold period. Shivering with cold sometimes makes people tired, have a headache, suffer from insomnia, etc. It's not good for your health. Therefore, the cold water bath should end before the cold shivering period.

Taking a cold bath is good, but not everyone can take it anywhere. The following points must be noted:

First of all, you need some physical preparation. It is best to start from summer and stick to autumn and winter, so as to gradually adapt to the cold stimulation and ensure physical strength.

Second, when your health is poor, you should drop out of school. Those who suffer from severe hypertension, coronary heart disease, respiratory diseases, suppurative otitis media, conjunctivitis, cold and fever, or feel tired, weak, lack of sleep or in a bad mood are prohibited from taking a cold bath.

Third, it is forbidden to blindly extend the time by taking a cold bath. The longer a person stays in cold water, the more energy will be lost. If the body temperature center can't keep up with the regulation of heat production, or an accident occurs because of physical exhaustion. Therefore, it is necessary to determine the time for taking a cold shower according to your tolerance for cold water, and then stop.