1. Warm stimulus: Different water temperatures lead to different stimuli. Taking a bath with warm water, when the body temperature rises to 65438 0℃, it will start sweating to dissipate heat and consume heat in the body. At the same time, it will increase breathing frequency, accelerate blood circulation and promote metabolism.
The effect on autonomic nervous system is that taking a hot bath can enhance the tension of sympathetic nerve, while taking a warm bath can make parasympathetic nerve dominant, which has a calming effect and is conducive to the recovery of neurasthenia.
Take a warm bath first, then rinse with cold water or enter a cold water bath, which can exercise blood vessels. Capillaries expand in warm water bath and contract in cold water bath, so that blood vessels keep good elasticity. Perseverance can not only promote the metabolism of the body, but also help prevent arteriosclerosis.
2. The role of physical hydrostatic pressure When taking a bath, although the human body has no strong feeling about the hydrostatic pressure of water, it actually bears the pressure of the heavy object of water. A person with a height of 165 ~ 175 cm should bear the pressure of 1200 ~ 1300 kg, and the chest circumference can be reduced by1~ 3.5 cm; Abdominal circumference is obvious, 2.5 ~ 6.5 cm. Therefore, the abdominal pressure increases, the diaphragm is pushed upward, the pressure in the chest cavity also increases, and the vital capacity decreases. On the other hand, venous blood and lymph on the body surface flow back to the heart due to the pressure of water, which increases the load of the heart. Therefore, applying hydrostatic pressure to the chest and abdomen can activate the respiratory muscles, which is especially beneficial to people who lack exercise.
3. The role of buoyancy The specific gravity of human body is 1.036, and that of water is 1.0. People will lose weight when they take a bath. If a person weighing 70kg is shoulder-to-shoulder immersed in the bath water, his body and head weight above the water is only 7.34kg, which is only one ninth of the original total weight. Therefore, the human body moves more easily in the bath water than in the air.
4. The role of negative ions in the shower, the shower head that sprays water is a good negative ion generator, because when the shower head sprays fine water, it can produce a lot of negative ions in the air. Negative ion is a special "vitamin", which can promote human metabolism, coordinate the elimination of waste, be beneficial to the growth and development of the body, improve the body's resistance, and have the functions of relieving cough, hypnosis, lowering blood pressure and eliminating fatigue.
The above-mentioned functions of bathing can not only remove dirt and bacteria on the skin surface, keep sweat glands unblocked, make the skin fit, but also promote blood circulation, improve sleep, relieve physical and mental fatigue and enhance disease resistance. When you use your brain too much and feel dizzy and bloated, bathing helps to eliminate brain symptoms and restore your spirit. When you feel sore back and weak feet after intense labor, bathing can help eliminate fatigue and bring comfort. Therefore, bathing is not only a kind of enjoyment, but also a technology of skin care, fitness and longevity.