1, to prevent colds

Increase the adaptability of human body to temperature, especially to cold air, and it is not easy to catch a cold. After cold water exercise, because of physical exercise, the nasal cavity and pharynx mucosa can adapt well when stimulated by cold, and diseases such as colds are not easy to occur.

2, improve blood circulation

Cold water bath is beneficial to the nervous and cardiovascular system. When the whole skin is exposed to cold water, under the innervation, the blood vessels of the skin contract first and then relax, thus improving the blood circulation of the skin, strengthening the nutrient supply to the subcutaneous tissue, increasing the secretion of skin glands, and making the skin flexible, smooth, elastic and resistant.

3. Prevention of vascular diseases

Cold water bath can improve the body's adaptability to cold stimuli. When the human body is stimulated by cold water, the skin blood vessels contract sharply, resulting in a large amount of blood flowing to the deep tissues and organs of the human body. Then, the skin blood vessels expand again, and a large amount of blood flows to the body surface again. 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, cardiovascular diseases can be prevented.

Step 4 enhance resistance

Under the action of cold water, the functions of nervous system, cardiovascular system, respiratory system and digestive system are strengthened, and the skills of other tissues and organs are also improved accordingly, thus improving the functional level of the whole body. The barrier function is enhanced and the disease resistance is improved. Old people or mature people often take cold water bath exercise, which can also reduce the accumulation of fat and cholesterol in the blood, thus helping to prevent arteriosclerosis and hypertension.

5, stimulate the digestive system

Cold water acts on the skin, causing the blood vessels of the skin to contract violently, and the blood flows to the zang-fu organs or deep tissues, which can enhance the metabolic process of the zang-fu organs and increase the heat. Blood circulation in abdominal cavity is accelerated, gastrointestinal function is active, and intestinal peristalsis is accelerated, which can improve digestion and absorption ability, thus enhancing the function of the whole digestive system and making people have a strong appetite.

6. Improve nervous system function

Stimulated by cold water, the brain will immediately get excited, mobilize all organs and tissues of the whole body to strengthen activities and resist the cold; The relaxation of blood vessels in the whole body depends on the regulation of the central nervous system. Long-term cold bath exercise can enhance the function of the central nervous system and slow down the aging and death of brain cells through nerve reflex and brain function.

Second, these people are not suitable for taking a cold bath:

1, hypertensive patients

As soon as 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 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 coronary heart disease

Because cold water stimulation can induce angina pectoris, even acute myocardial infarction or sudden death. According to clinical research, the peak of acute myocardial infarction is from 1 1 to April of the following year, and the main reasons may be related to cold stimulation and sudden climate change. Because the patient is stimulated by cold, the α adrenergic receptor of the body is excited, the arterioles of the whole body are contracted, the ejection resistance of the heart is increased, and the oxygen consumption of the myocardium is increased. Coronary artery disease in patients with coronary heart disease, coronary blood flow can not be increased accordingly, which eventually leads to myocardial ischemia and angina pectoris.

3. Patients with sciatica and arthritis

After the nerves catch cold, the condition will be more serious.

4. People who are allergic to cold

For example, patients with cold urticaria and itchy skin 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.

5. Women in Special Period

Because of its special physiological reasons, especially when female friends are in menstruation, lactation and pregnancy, the stimulation of cold water will cause endocrine disorders, amenorrhea and abdominal pain, and many bacteria will also enter the vagina to cause gynecological diseases such as vaginitis, which will seriously affect women's future pregnancy and health.

Third, the precautions for taking a cold bath in winter:

1, take a cold bath in winter step by step.

Cold water bath should start in autumn or early winter, and then transition to winter. At the same time, when washing cold water, you should first "warm up" and rub your skin and joints with your hands until your body is slightly red and hot. When taking a bath, you should first pour water on your limbs, then rinse your chest and back for a few minutes to give your body a buffer. In addition, for beginners, you can wash your face with cold water, wash your feet with cold water, wipe your body with cold water, then take a cold shower and soak in cold water to give your body a buffer.

2, cold water bath should pay attention to the water temperature and time.

Generally, the water temperature is 5℃- 10℃, and it only takes 10- 15 minutes to take a bath, and the longest time is no more than half an hour. After a cold bath, you should dry your body in time and wipe it with a towel until your skin is red and hot, which can promote the rapid expansion of subcutaneous blood vessels and make your whole body feel warm and comfortable.

3. Pay attention to your own feelings

If there are symptoms such as persistent whitening of skin, dizziness, and chills all over the body during bathing, stop immediately to avoid accidents.