As we all know, the rhythm of contemporary life is so intense. Persons are busy with their work, actions and leisure throughout the day. Subsequently they like washing hair within the night when they’re free.
In fact, it’s OK if in case you have sufficient time for the hair drying out while you wash hair within the night. However generally you might be too busy to scrub hair earlier than 10 pm, and you are feeling so drained after washing that you just at all times go straight to mattress and sleep earlier than the hair is completely dry. To take action, the elders will say that can trigger headache later. In actual fact, their phrases are considerably cheap by fashionable scientific analysis.
We should know that the human physique at all times produce warmth repeatedly within the metabolism course of to keep up the physique temperature. And the warmth can be transferred to floor layer of organism by blood circulation and emanated to the skin with methods of radiation, conduction, convection in addition to evaporation.
For these with sturdy physique resistance and regular regulating operate, the 2 processes of heating and cooling are in steadiness, that’s to say warmth will improve when the physique temperature declines, which make the physique temperature stay at round 37 C. However for individuals who have weak physique resistance and poor regulating operate of physique temperature, they’re straightforward to get chilly by entire or native publicity to chilly.
After we wash hair with heat water, the capillaries of the scalp will dilate as a consequence of heat impact and the warmth of the physique radiating round will improve. In the meantime, the moist hair will trigger lots of water to evaporate, which take away a lot warmth. Typically talking, 500 energy shall be taken away when one gram of water evaporates.
As the warmth loss will increase and the physique will get chilly, the capillaries of the higher respiratory tract shrink reflectively, partial blood movement quantity reduces and the resistance of the higher respiratory tract decreases, which result in that existed virus or micro organism get an opportunity to step in, develop and reproduce. It is going to consequence within the respiratory tract infections, which make individuals have flu signs comparable to runny nostril, stuffy nostril, headache or fever.
So usually talking, you need to keep away from washing hair earlier than going to mattress. Even in the event you had to do this, you need to towel your hair dry. On this approach you’ll not catch chilly.