1, when taking a cold bath, the human body will feel cold because of the low water temperature, which will produce a series of stress reactions, such as rapid heartbeat, high blood pressure, muscle contraction, nervous tension, etc., which can not only eliminate fatigue, but also easily cause colds, and should be avoided as far as possible. For those friends with poor physical fitness, it is even more impossible to take a bath with cold water, otherwise their resistance is poor, and diseases such as colds and fever will be caused by the stimulation of cold. \x0d\\x0d\2. In some areas, the climate changes greatly, which makes the flu advance. It is not wise for some friends to take a cold bath as early as possible. However, you can persist in washing your face with cold water for a long time, promote blood circulation, prevent colds and rhinitis, and make your skin more shiny and elastic. \x0d\\x0d\3. For winter swimmers who insist on exercising all the year round, there needs to be a process of learning and adaptation, and it needs to be persisted all the year round. However, cold water bath exercise must take a step-by-step approach: in autumn, the temperature gradually decreases, and the human body gradually adapts to cold and cold water, so that in late autumn and winter, cold water bath does not feel too cold. The "step by step" of cold water bath should also include "from local to whole body" of bathing parts, "from high to low" of water temperature and "from short to long" of bathing time. \x0d\\x0d\ Precautions for taking a cold bath; \x0d\\x0d\ 1. Women should never take a cold bath. \x0d\ When taking a cold bath, because the water temperature is too low, the human body will feel cold and produce a series of stress reactions, such as rapid heartbeat, high blood pressure, muscle contraction, nervousness, etc., which can not only eliminate fatigue, but also easily cause colds, and should be avoided as far as possible. Because of its special physiological reasons, especially female friends during menstruation, lactation and pregnancy, the stimulation of cold water will cause female 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 physical health. \x0d\2. People with coronary heart disease should never take a cold bath! ! \ x0d \ x0d \ cold water bath can promote the blood circulation of blood vessels all over the body, and enhance the opening and closing function of skin pores. Long-term adherence to cold water bath can improve the cold resistance of the body, thus helping to prevent colds and other diseases. \x0d\ Cold water bath is really beneficial to healthy people, but it is not suitable for patients with coronary heart disease. Because cold water stimulation can induce angina pectoris and even acute myocardial infarction or sudden death. According to clinical research, the peak of acute myocardial infarction is from 1 1 month to April of the following year, and its main reasons may be related to cold stimulation and sudden climate change. Because the patient is stimulated by cold, it excites the α -adrenergic receptor of the body, causing the systemic arterioles to contract, increasing the ejection resistance of the heart and increasing the oxygen consumption of the myocardium. \x0d\ Patients with coronary heart disease have coronary artery lesions, and the coronary blood flow can not be increased accordingly, which eventually leads to myocardial ischemia and angina pectoris. \x0d\ Therefore, patients with coronary heart disease should pay special attention to cold and warmth in cold season, and avoid taking cold showers to avoid acute attack of coronary heart disease. \x0d\3. Don't take a cold bath after sex \x0d\ In the process of "sharing a bed", the whole body's blood circulation is accelerated, which is manifested by high blood pressure, rapid heartbeat, enhanced gastrointestinal peristalsis, skin flushing, sweat gland pores open and sweating, and so on. Therefore, after the end of * *, you will feel irritable and thirsty. Some people are eager to drink cold drinks, or take a cold bath to get rid of sweat, which is not good for their health. \ x0d \ x0d \ Because during sexual life, the blood vessels in the gastrointestinal tract are in an expanded state, before the congestion of the gastrointestinal mucosa returns to normal, taking cold drinks will cause the gastrointestinal mucosa to suddenly get cold and suffer certain damage, and even cause gastrointestinal discomfort or colic. By the same token, in the process of * *, the skin blood vessels in the whole body are also congested and dilated, and the pores of sweat glands are in an open state of perspiration. At this time, if the skin is blown by cool wind or bathed in cold water, the blood vessels of the skin will suddenly contract, so that a large amount of blood will flow back to the heart, which will increase the burden on the heart; At the same time, it will also cause the sweat gland drainage hole to suddenly close, so that sweat will be stored in the sweat gland and it will be harmful to health. \ x0d \ x0d \ If you feel thirsty, you might as well drink a small amount of warm boiled water first. After sexual intercourse 1 hour or so, it is advisable to take a cold bath after the blood circulation of various systems and organs of the body returns to normal. \x0d\4. Take a cold bath carefully after sweating in summer \ x0d \ x0d \ You can't take a cold bath immediately after exercising in summer. This is because the temperature is high in summer, and the body produces more heat during exercise. Sweat evaporation and skin vasodilation are important ways to dissipate heat. \x0d\\x0d\ At the end of exercise, the human body is still in a state of vigorous metabolism, increased heat production and dilated skin blood vessels. At this time, if you take a cold bath immediately, your skin will be stimulated by cold water, which will cause skin blood vessels to contract through nerve reflex. As a result, sweating and heat dissipation will be blocked, but it will make heat dissipation difficult and body temperature rise. At the same time, the decrease of skin blood flow suddenly increases the blood flow back to the heart, which will increase the burden on the heart. \x0d\\x0d\ Also, when the body goes from a hot environment to a cold environment, it is too late to adapt to the adjustment, and it is often easy to catch a cold or cause gastrointestinal spasm. Muscle fatigue and tension increase after exercise, and then cold stimulation may also cause cramps. After sweating in summer, you should drink some salty boiled water properly, then rest for about 1 hour, do some preparatory activities and then take a cold bath. If conditions permit, it is best to take a warm bath. \x0d\5. Take a cold shower carefully after work \ x0d \ x0d \ You can't take a cold shower immediately after working in summer. This is because at the end of labor, the human body is still in a state of vigorous metabolism, increased heat production and dilated skin blood vessels. If you take a cold bath immediately, the skin will be stimulated by cold water, which will cause the skin blood vessels to contract. As a result, sweating and heat dissipation will be blocked, but it will make heat dissipation difficult and body temperature rise. At the same time, the decrease of skin blood flow suddenly increases the blood flow back to the heart, which will increase the burden on the heart. Muscle fatigue and tension increase after work, and then cold stimulation may also cause cramps, colds or gastrointestinal spasms.