As the saying goes, "If you want to be healthy, take a cold bath every day". Many people feel refreshed after taking a cold shower, and even insist on washing all year round. So, how about a cold bath? For most people, if the method is correct, taking a cold bath is good for health. This is because, in the first minute or two, the skin epidermis will shrink and blood will flow to the internal organs. But after two or three minutes, the body will adapt to this temperature, and the blood will be redistributed and returned to the skin epidermis. The whole process is like "gymnastics" for blood vessels, which can not only enhance the resistance, but also enhance the elasticity of blood vessels and prevent arteriosclerosis. Secondly, bathing with cold water will obviously stimulate the nervous system, leading to faster heartbeat, deeper breathing and faster blood flow, which can not only promote metabolism, but also make the skin soft and elastic. In addition, taking a cold bath also helps to enhance the digestive function, and has a certain auxiliary therapeutic effect on chronic gastritis, gastroptosis, constipation and other diseases. However, in order to "enjoy" the benefits of taking a cold bath to the maximum extent, we must adopt scientific and reasonable methods, as follows: starting from summer, stick to it and step by step; Do a "warm-up" exercise before each cold shower: rub your skin for a few minutes until you feel red and hot; When taking a bath, first pour water on the limbs, and then rinse the chest and back for a few minutes to let the body have a gradual adaptation process; The water temperature should not be too low, 5℃-25℃ is appropriate, and the time should not be too long, 10- 15 minutes or so, and the longest time should not exceed half an hour. In addition, it should be noted that it is not advisable to take a cold bath after strenuous exercise, because the capillaries on the body surface are dilated at this time. If you suddenly "encounter" cold water, it will increase the burden on your heart and cause discomfort such as palpitation, shortness of breath and dizziness. In the process of bathing, if there are symptoms such as persistent whitening and dizziness, stop immediately to avoid accidents. A cold bath is not for everyone. The following people should "relax" when taking a cold bath: infants and elderly people over 60 years old are best not to wash, and women should not wash during menstruation and pregnancy, so as to avoid excessive water temperature; For people with poor immunity due to long-term continuous overtime or illness, bacteria and viruses are easy to enter, causing diseases such as colds and pharyngitis; Sensitive person should not be washed with cold water, otherwise it will have a rash; Taking a cold bath in patients with hypertension will increase blood pressure, and even lead to cerebrovascular bleeding, stroke, coma and so on. Taking a cold bath in patients with heart disease will increase the burden on the heart, induce angina pectoris, acute myocardial infarction and even sudden death; Patients with rheumatism and sciatica who are stimulated by cold water will aggravate local pain and should not take a cold bath. 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. It takes perseverance to take a cold bath in winter. Disadvantages: Different personal constitutions will lead to different diseases. Precautions for taking a cold bath in summer should be done every day. Many people often take a cold bath to save trouble, and some people take a cold bath for health and fitness. 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.