What are the misunderstandings of health preservation in summer
In summer, the days are long and the nights are short, the heat is burning, and health care is particularly important. However, the health care methods that many people are used to are actually unscientific. Here are some misunderstandings about summer health care, which are beneficial to people's summer health care.
Sweating is good for health
Sweating in summer, on the one hand, can evaporate heat to keep the body temperature constant; on the other hand, it can discharge a variety of harmful metabolic wastes, such as lactic acid, carbonic acid, creatinine, urea and bacterial toxins. So as long as you can sweat and urinate in summer, you won't get sick. If there is no sweat and little urine, it is often a sign of heatstroke. Old people sweat gland atrophy, so easy to get heatstroke.
So, why is sweating too much bad? The reason is that the effect of evaporation and heat dissipation is the best with a small amount of sweating; if the sweat drops flow, the heat dissipation effect is not good, which will damage the body fluid and vitality in vain. Because a lot of sweating can lose many useful substances, leading to the lack of potassium and sodium in the body. According to the determination, sweat also contains zinc, copper, chromium, molybdenum, cobalt, iodine and other trace elements, as well as vitamins and other active substances, so excessive sweating will lead to dehydration deficiency. In addition, a large number of sweating can make the blood concentrated and the blood viscosity increased, which is dangerous to induce thrombus and myocardial infarction in patients with arteriosclerosis. Therefore, when sweating a lot in the hot summer, you should replenish water and salt at any time. We should drink more vegetable soup and eat more fruits and vegetables with more moisture and rich in vitamins and potassium salt, such as watermelon, cucumber, spinach, loofah, etc.
Drink plenty of water after exercise
Sports in summer are bound to sweat a lot. If the exercise time is a little longer and the body loses more water, it will inevitably feel dry mouth. Some people drink a lot of water after exercise. First, they feel happy. Second, they feel that drinking a lot of water can supplement the body's needs as soon as possible and make the body fluid balance. In fact, this is not right. When people are exercising, a large amount of blood remains in the muscles of limbs. If you drink a lot of water immediately after exercise, it will make some blood vessels of gastrointestinal tract contract rapidly, reduce the absorption capacity, and make people feel heavy and stuffy in the stomach, hinder the activity of diaphragm, and affect the normal breathing. Therefore, after summer sports, you should add some water, especially salt water, and don't drink a lot of water quickly.
Shirtless cool
Some people always like to be naked in the sultry dog days. They think it's not necessarily so cool. From the physiological point of view, human body temperature regulation depends not only on skin evaporation, but also on skin radiation. According to the measurement, 70% of the human body temperature is radiated, convective and conducted by the skin in the environment with the temperature of 18-28 ℃; when the temperature reaches 35 ℃, the body temperature is mainly evaporated by the skin; when the temperature continues to rise, the skin can not radiate heat by means of radiation, but also absorbs heat from the external environment. Therefore, if you are shirtless at this time, it is easy to absorb heat. Instead of being cool, you will feel more sultry.
Don't sleep late in summer
Some people think it's better to sleep when the temperature drops in the middle of the night after summer and get up late the next day. But according to the human body's' biological clock ', the best time to sleep is 22-23, and 5-6 in the morning is the' climax 'of the biological clock. At this time, the spirit of getting up is the best. Therefore, we should still live on time in summer.
Open the door and windows, cool and fast
In the hot summer days, the outdoor temperature is very high, sometimes even the outside wind is hot, at this time, opening the doors and windows will make the indoor and outdoor temperature as high. Therefore, in summer, if the air temperature outside the room is very high, the doors and windows should be closed before 14 o'clock when the temperature is the highest, so as to keep the indoor temperature at a low level. When the doors and windows are opened in the evening, the room will be cooler.