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. In hot summer, especially after exercise, you will sweat more. 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, the infirm and children.
Second, the benefits of cold water washing feet
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.
Third, the correct approach.
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".