First, the role of keeping warm against the cold
"Su Wen Si Qi Tiao Shen" pointed out: "In Xia San month, qi is vented ... In winter and March, it is a way to get rid of cold and warm the skin, and to seize the qi in a hurry, and to hide electricity." That is to say, in summer, it is necessary to make the yang in the body radiate outward; Avoid severe cold in winter and keep warm, so as not to make the skin sweat and affect the yang. In the four seasons of spring temperature, hot summer, cool autumn and cold winter, besides the regulating function of human body, clothing plays an extremely important auxiliary role in temperature regulation.
Modern medical research has proved that cold can lead to dysfunction of sympathetic and parasympathetic nerves, cause vasomotor reflex of capillaries and increase resistance of capillaries. Patients with cardiovascular diseases such as coronary heart disease, cerebrovascular disease and hypertension may get worse when they are cold. Cold changes the physical and chemical properties of blood, such as accelerating blood flow, shortening coagulation time and increasing blood viscosity, which is the main inducing factor of thrombosis and myocardial infarction. Cold makes human immune function decline, endocrine function disorder, and often induces respiratory diseases such as chronic bronchitis and bronchial asthma. Cold causes cerebral cortex dysfunction, vagus nerve excitation, increased gastric juice secretion, decreased corrosion resistance of gastric mucosal barrier, gastric and duodenal ulcers, and so on. Therefore, it is necessary to increase or decrease clothes in time and pay attention to keeping warm and keeping out the cold.
Second, clothing and skin hygiene.
In daily life, people's skin is influenced not only by heredity, objective environment and nutrition, but also by clothing.
The pollution of clothing to human skin can be divided into internal (human physiology) and external (artificial) pollution. Internal pollution is caused by skin secretions, such as moisture, sweat, fat and dandruff. In terms of fat pollution, neck >: back >: scapula > chest >; Waist and abdomen > thigh; According to the season, summer > spring and autumn, spring and autumn > winter; In sports, labor >; Go, go > sit still.
External pollution refers to dust, lampblack, floating objects, food stains and cosmetics in the air. These are all related to the fabric of clothes. For example, fluff attaches more dust than smooth fabrics. If clothing materials cause skin discomfort, it is related to chemicals used in fiber manufacturing and dyes and dyeing AIDS used in finishing. Vinylon contains formaldehyde; In order to make the cloth soft, chemical components such as sulfate, polyol and fatty acid are often added. Adding formaldehyde in the non-ironing process ... will cause skin damage. In dyeing and finishing, basic dyes, acid dyes, vat dyes and disperse dyes all contain amino groups (-NH2). The higher the color purity, the brighter the color, and the higher the amino content, such as bright yellow, malachite green, sapphire blue, saffron, etc., which is not good for the skin. So pay attention to the fabric when choosing clothes.
In addition, there is microbial pollution, which is caused by bacteria, fungi and viruses produced by skin secretions, skin temperature, external pollution, fabric properties and other factors. Sweat contains urea, uric acid, creatinine, ammonia and other organic substances, which will produce sweat odor after being absorbed by clothes, which is one of the reasons why we often wash clothes.
Health guide
Know our skin.
The skin system is one of the functional systems of human body, which consists of epidermis, dermis, subcutaneous tissue and skin derivatives (nails, hair, hair follicles, etc.). ) and surrounds the outer surface of the human body.
Skin has the following four functions:
1. Protection. Skin is the body's first line of defense. The stratum corneum cells are closely arranged, which can prevent the invasion of germs, physical and chemical substances in the external environment. Melanin produced by melanocytes in mucous layer can absorb ultraviolet rays in sunlight.
2. Secretion and excretion. Sebum secreted by sebaceous glands can moisturize skin and hair; Sweat secreted by sweat glands can excrete excess water, urea and inorganic salts in the body; Mammary gland secretes milk and nurtures offspring.
3. feeling. Skin is an important sensory organ, rich in nerve endings and various special receptors. It can sense cold, heat, touch and pain, and find danger in time.
4. Keep warm. The human body needs to keep its temperature constant. Too high or too low is not conducive to life activities. The mechanism of thermoregulation mainly depends on the change of blood flow of skin capillaries.