What's in a glass of sweat?
98 ~ 99% of the composition is mainly water, with a specific gravity of about 1.002 ~ 1.003 and a pH value of 4.2 ~ 7.5. NaCl is about 300mg/ 100ml.
1 ~ 2% is a small amount of urea, lactic acid and fatty acid.
Sweat is the liquid secreted by sweat glands. Sweating due to thermal stimulation caused by the increase of external temperature or internal heat production is called perceptual sweating. At this time, the sweating area is widely distributed, and the skin in all parts of the body, especially the forehead, neck, trunk, waist, back of hand and forearm, is the most; Followed by the neck, trunk side and most limbs; Once again, the inner thigh and armpit; At least the palms and feet. Mental stress can also lead to sweating, and sweating centers are distributed in all parts of the central nervous system. Normal people unconsciously evaporate about 600 ~ 700 ml of water within 24 hours.
Sweat, my friend!
Sweating is divided into active and passive. Passive sweating refers to sweating due to sultry weather and irritability, which is harmful to human body. On the contrary, the sweat that the human body actively exercises is called active sweating, which is conducive to maintaining the temperature in the human body and emitting heat, which is beneficial to people's physical and mental health.
The function of sweat is to regulate body temperature. Think about it carefully, the human body is really like a precise machine. If you don't sweat, that's not good. As soon as you exercise, your blood circulation will speed up and your body temperature will rise. Naturally, you will sweat and your body temperature will drop. When it is cold, sweat glands and pores will contract to prevent body temperature loss.
Sweat is the "air conditioner" of our body. Chinese medicine believes that sweating is a kind of detoxification in summer. There are two ways for people to detoxify: one is urination, and the other is sweating. Sweating is the most effective way to detoxify. Only in summer can you sweat naturally all year round, which will be good for human metabolism, meridian balance and immune system health. If you don't sweat for a long time, your skin won't breathe, which will eventually cause many disorders in your metabolic system, and the detoxification function of this skin will be transferred to your kidneys and liver.
Sweat, enemy!
Sweat components can be divided into inorganic components and organic components, both of which are metabolites in the body. Inorganic components are mainly salts such as sodium chloride and calcium carbonate, some of which are acidic and some are alkaline. Excessive accumulation of these acid and alkali components will directly corrode the skin, destroy the tissues and cells of the skin, and lead to skin aging. The accumulation of organic components in sweat on the body surface is more conducive to the reproduction of microorganisms on the body surface under the impetus of high temperature weather.
Due to air pollution and the use of equipment in gymnasiums, a large number of bacteria and parasites on the skin surface will decompose the organic components in sweat, produce various toxic substances and release malodorous gases, thus producing a serious "sweat odor" and even causing skin diseases, which are also commonly known as sweat rash, folliculitis, eczema, boils and miliaria.
In addition, sweating will reduce the resistance of the skin. Sweat and sebum are secreted normally, and form a sebum film after mixing on the skin. Excessive sweating, the proportion of sweat and sebum is unbalanced, and sebum will be washed away by sweat and become thinner. Generally speaking, normal weak acidic skin will become alkaline, so the resistance of bacteria will be weakened and the bactericidal power will also decrease. Some people will have skin diseases, and some people's skin will become rough.
Related links
Male sweating depresses women.
Biologists at the University of Pennsylvania in the United States have found that the sweat discharged by men has an unexpected good effect on women's emotions: it can help women reduce stress, make them relax, and even affect their menstrual cycle.
The researchers collected sweat samples from the armpits of the men who participated in the experiment for four weeks, during which they were not allowed to use deodorant. Then they mixed these sweat extracts and sprayed them on the upper lips of 18 women aged 25 to 45. These women used a fixed standard to evaluate their emotions within 6 hours, and found that sweat extract made them feel high and helped to reduce tension.
There is no indication that male perspiration will cause female sexual desire. In fact, these women who participated in the experiment never thought that it was men's sweat splashing under their noses. The researchers said: "The experiments are conducted in a completely sterile environment, and it is not surprising that they will not have sex. If it is in a sexy environment, exposure to this smell may promote sexual awareness. "
Khan promotes men's magazines?
Recently, Psychology and Marketing magazine published a research result by a British scholar. A pheromone in male sweat will make men want to see something that can help them improve their masculinity. Michael Kirk-Smith of the University of Ulster in England and Klaus Herbst of the University of Vienna in Austria designed this research content. They presented three magazines to 120 college student volunteers, one is a women's magazine called Attraction, the other is neutral National Geographic, and the other is Men's Health. Volunteers were equally divided into two groups, with equal numbers of men and women. They all wore masks. The masks of the first group of volunteers were sprayed with a solution containing androstenol pheromone, which was found in sweat secreted by men under their armpits.
The results showed that compared with the control group, male volunteers who sprayed pheromones on masks obviously showed greater interest in men's magazines, and they also showed a stronger desire to buy magazines. In this study, female volunteers seem to be completely unaffected by pheromones.
Prevent dehydration
Although sweating is a physiological regulation, excessive sweating and insufficient fluid replacement will lead to dehydration and affect health. Mild people are thirsty, have less urine, are weak, have muscle spasms, and severe people suffer from heatstroke, high temperature and even life-threatening. Long-term indoor activities in summer, due to poor air circulation, even under air conditioning conditions, the human body will lose a lot of body fluids through evaporation, breathing, urination and other inconspicuous sweating methods, resulting in dehydration phenomena such as fatigue and thirst.
How to determine the loss of body fluids? How to replenish lost body fluids? Generally, the method of weighing is used, that is, weighing before and after exercise, and the difference in weight is the amount of sweat during exercise. Rehydration is based on the weight lost that day. For every 65,438 0 kg weight loss, at least 65,438 0,500 ml (65,438 0.5 L) of liquid should be added to correct dehydration. According to experience, basketball may lose 0.9 ~ 1 .6 liters of sweat per hour, football may lose 0.6 ~ 2.42 liters of sweat per hour, and bicycle may lose 0.62 ~ 1 .25 liters of sweat per hour. Dehydration can only be effectively corrected by supplementing body fluids which are 1.5 times of the loss.
The American Sports Medicine Association suggests that 500ml of liquid should be added 2 hours before exercise, and 750 ~ 1000 ml should be added 2 hours before exercise in hot summer. Generally, you can drink 200 ~ 400 ml of electrolyte-containing liquid before exercising or going out in summer, and replenish 150 ~ 250 ml of electrolyte sports drink every time during exercise until exercise or sweating stops, and the rest of the liquid can be replenished within 6 ~ 12 hours.