It is especially easy to catch a cold when your feet are cold. As the saying goes, cold starts from the feet, which reflects the fact. It turns out that there are always some microorganisms in people's respiratory tract that can cause respiratory diseases such as colds. But the upper respiratory tract also has some resistance. Microvessels distributed in the mucosa of the upper respiratory tract constantly transport antibodies in blood to the mucosa, and countless tiny cilia on the mucosa constantly sweep away microorganisms and dust attached to the upper respiratory tract. When people catch cold, especially their feet catch cold, the microvessels of the upper respiratory mucosa contract immediately, the temperature drops immediately, and the cilia activity is not so lively. After a period of time, the nasal mucosa is congested and swollen, and the cilia even stop moving. At this time, the bacteria and viruses lurking in the nasopharynx will multiply rapidly and reach the peak after 18 hours. So, the cold began. It is observed that a person who lacks cold-resistant exercise will soon have a stuffy nose if he soaks his feet in cold water at 15 degrees Celsius. However, after several days of continuous exercise, these reactions disappeared. But if he is allowed to immerse his feet in colder water at 12 degrees Celsius, these reactions will revive. This observation not only proves that the change of foot temperature is really sensitive, but also proves that the adaptability of foot to temperature change can be improved through exercise. Therefore, cold-resistant exercise by washing feet with cold water is an effective way to prevent colds. Cold water foot washing should start with warm water, step by step and persevere. After the water temperature drops to 15 to 18 degrees Celsius, continue to exercise for a period of time. If the reaction is good, you can slowly continue to reduce the water temperature until it is about 4 degrees Celsius. Exercise for one or two minutes at a time and massage your feet constantly. After washing your feet with cold water in winter, you can also soak them in warm water for a few minutes.
Why can you keep fit by washing your feet with cold water?
All parts of a person are a unified whole. Washing feet with cold water will not only cause the blood vessels in the feet to contract violently, but also other parts that are not stimulated by cold water will change to varying degrees. It is observed that when people's feet are affected by cold water, at first, the blood vessels contract reflexively, the blood flow decreases, and the temperature of nasal mucosa drops obviously; After a certain period of time, the blood vessels in the foot began to expand, and the temperature of the nasal mucosa also increased. After a few minutes, it shows a more intense increase, accompanied by runny nose and sneezing. If you wash your feet with warm water and gradually lower the water temperature, the above symptoms will not appear.
At the same time, washing feet with cold water will not only affect the nasal mucosa, but also increase the temperature of skin, viscera and muscles in the cold parts. So washing feet with cold water has a great influence on the whole body. When exercising, you must also start with warm water and gradually reduce the water temperature. After the temperature drops to 16 ~ 18℃, do not continue to decrease. If the reaction is good after a period of exercise, then lower the water temperature at the slowest speed until it drops to about 4℃. Soak for a minute or two at a time and massage your feet constantly. After washing your feet in winter, you can also soak in hot water for a few minutes to speed up the warmth of your feet.
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Don't wash your feet with cold water in summer.
In summer, many people like to put their feet directly under the tap to make themselves feel cool, comfortable and convenient. Some people think that washing feet with cold water can also promote the blood circulation function of the feet and improve the body's ability to keep out the cold. Actually, this is a misunderstanding.
As the saying goes, "Cold starts from the soles of your feet." Because the human foot is the distal part of the blood vessel branch,
It is prone to peripheral blood circulation disorder and lack of sebaceous glands on the soles of the feet, so it is very sensitive to cold. Someone has done experiments. If you put your feet in cold water at 4℃, the reflex will cause vasoconstriction of nasal mucosa, and symptoms such as runny nose and sneezing will appear after three minutes.
Men will sweat more in hot summer, especially after exercise. At this time, suddenly washing feet with cold water will suddenly close and block the expanded pores. Coupled with muscle fatigue after exercise, increased tension, cold stimulation will also cause cramps. If you do this often, it will not only make your feet catch cold, but also lead to perspiration dysfunction after a long time. In addition, the sudden stimulation will cause the normal blood vessels to contract violently, which may lead to vasodilation dysfunction, induce the spasm of the extremity artery, and thus lead to a series of diseases, such as erythematous limb pain, arthritis, rheumatism and so on. Not only for men, but also for women, every time menstruation comes, it means that the whole body or part of the resistance drops and it is easier to get sick. At this time, if you wash your feet with cold water, cold stimulation will also cause vasoconstriction and blood volume reduction, which will make the blood circulation of uterus and pelvic cavity disorder and lead to gynecological diseases. Therefore, even in hot summer, we should be careful not to catch cold feet. Keeping feet warm has a good effect on preventing diseases such as colds, flu, rhinitis, asthma and angina pectoris. This is especially true for the elderly and children.
The correct way is to wash your feet with hot water before going to bed every night. The temperature of foot washing water should be higher than the body temperature, and the amount of water should not exceed the ankle. This can remove acidic products of foot skin metabolism and bacterial decomposition, and relieve muscle fatigue and soreness. The stimulation generated by hot water washing feet can also make each acupoint bear heat, leading to the elimination of foot stasis, thus promoting systemic blood circulation. If you insist on washing your feet with warm water every day, it can also play a role in regulating qi and blood, eliminating fatigue, stimulating appetite, relaxing muscles and activating blood circulation, and has certain treatment and prevention effects on insomnia, neurasthenia, joint pain, indigestion, low back pain, stomach pain and chilblain and other systemic or local diseases. The same is true of the folk proverb "It is better to take tonic than to soak your feet in hot water".