In the hot summer, in order to eliminate the heat many people may take several baths a day. Bathing not only can relieve the summer heat, relax the muscles and blood, but also improve metabolic function and enhance resistance. However, the summer bath also need to pay attention to the way and method, or not only counterproductive, may also induce heart disease. 1, bath water temperature summer heat, many people like to take a cold shower to beat the heat, indeed, cold bath can improve the body’s ability to adapt to external climate change, as well as delay the aging of tissues and organs, improve skin blood circulation, maintain skin beauty have a certain role. Cold water shower body, the body in order to maintain a constant body temperature, will quickly mobilize the regulatory function, which will improve the stress capacity of the nervous system, but also enhance the elasticity of blood vessels, improve organ function, the prevention of atherosclerosis, hypertension, coronary heart disease and other age-related diseases are effective. But we need to note that the cold bath water temperature is generally maintained at about 20 ℃, too low a temperature will make the body feel cold, resulting in a series of stress reactions, such as increased heart rate, increased blood pressure, muscle contraction, nerve tension, etc., not only can not eliminate fatigue, but also easy to cause a cold, should be avoided, especially for patients with underlying heart disease, may induce arrhythmia, acute heart failure and other occurrences, resulting in Danger. And for people who do not like cold bath or poor physical condition, in the summer we recommend a warm bath, water temperature at about 35 ℃, try with your hands, feel slightly hotter than the skin temperature slightly higher temperature. Because the temperature is too high easily let people lack of oxygen, especially for the elderly and pregnant women, may appear faint or make the fetus lack of oxygen and affect the development. 2, the number of bathing summer metabolic force, the flow of sweat more, should be rinsed at least once a day. For fat, sebaceous glands secretion of people, you can wash more times a day; elderly sebaceous glands secretion less, you can wash less times. In addition, subject to regional influences, the southern days can be hot when the day 3 times; cold days in the north three weeks to wash 1 time is not too much. 3, bathing time regardless of any season, bathing time should not be dragged too long, generally 15-30 minutes is appropriate, too long instead of appropriate, will make the skin surface easily dehydrated. Easy to make people fatigue, easy to cause heart ischemia, lack of oxygen.