Do you have the habit of gimmicks at night? I believe many people have the answer.
It is not difficult to understand that modern people’s life rhythm is relatively tight, and work, activities, entertainment, etc. during the day are too busy, and it is rare to have a comfortable night to wash your head.
After washing your hair at night, if you have enough time to let your hair dry before you sleep, then of course it is best. But sometimes it was too busy. After 10 o’clock in the evening, I washed my hair. After washing my head, I was so tired that my eyelids were too heavy to open, so I went to sleep when my hair was not dry.
In doing so, older generations will say that they will have headaches in the future. In fact, after modern scientific research, people find that this is not unreasonable.
Relationships with body temperature regulation
We must know that the body constantly produces heat during metabolism to maintain body temperature, which is also transmitted to the surface of the body through the blood circulation. Radiation, conduction, convection, and evaporation are continuously released to the outside world.
Warning: Now the shampoo shop is located in the streets and alleys of urban and rural areas. As a kind of leisure place, it is a pleasure to relax and wash your hair in the spare time. But experts believe that this fashion approach may be detrimental to human health.
People with strong body resistance have normal body temperature regulation. By adjusting, the two processes of heat production and heat dissipation are balanced, that is, when the body temperature tends to decrease, the heat production increases, the heat dissipation decreases, and the body temperature is lowered. Still maintained at around 37 °C.
However, for people with weak body resistance, their ability to automatically adjust body temperature makes the body maintain normal body temperature, so when the whole body or a part of the body is cold, it is easy to catch a cold.
After we wash our hair with hot water, the scalp capillaries expand due to the warming effect, and the body radiates heat to the surrounding area. At the same time, since the hair is wet after shampooing, a large amount of water evaporates. Also take a lot of heat. Generally, one gram of water is evaporated to take away 500 calories.
As the heat is increased, the body is frozen, so that the upper airway capillaries are reflexively contracted, the local blood flow is reduced, and the upper respiratory tract resistance is reduced, so that the pre-existing virus or bacteria are taken into the air. , growth and reproduction, causing upper respiratory tract infections, resulting in cold symptoms such as runny nose, stuffy nose, headache and even fever.
And if the baby is asleep while the hair is not dry, the adjustment function of the temperature regulation center is low, and the cold is more likely to occur.
Therefore, in general, it is best not to wash your hair before going to sleep. If you want to wash, use a dry towel to dry, then use the air tube to dry your hair before you sleep. I have a cold.
Sleeping when the hair is not dry, it is easy to catch a cold.