In the hot summer, swimming is one of the most popular exercise methods that can remove the heat. In fact, there are many benefits for the human body. It can not only hone people's willpower, but also enhance human immunity and beauty. Often, it also has six benefits.
1、
When people are around, water washes the skin, sweat glands and fat glands, which has a good massage effect, promotes blood circulation, and makes the skin smooth and elastic. In addition, when exercising in water, it greatly reduces the stimulation of salt in sweat on the skin.
2、
When swimming, the body is directly immersed in the water. The water not only has great resistance, but also has very good thermal conductivity and fast heat dissipation, so it consumes a lot of heat. Just like a boiled egg, its cooling speed in the air is far slower than that in cold water. Experiments show that the heat consumed by a person running in a standard pool for 20 minutes is equivalent to one hour on land at the same speed, and the heat consumed by staying in 14 degree water for one minute is as high as 100 kcal, which is equivalent to the heat emitted by an hour in the air at the same temperature. It can be seen that exercise in the water will make many people who want to get twice the result with half the effort, so it is one of the most effective exercises to keep their figure.
3. Strengthen lung function
Breathing mainly depends on the lung. The strength of lung function is determined by the strength of respiratory muscle function. Exercise is one of the effective means to improve and improve lung capacity. According to the test: when swimming, people's chest is subject to 12-15kg of pressure, plus cold water to stimulate muscle contraction, breathing is difficult, forcing people to breathe hard, increasing the depth of breathing, so that the amount of oxygen inhaled can meet the needs of the body. The average person's vital capacity is about 3200ml, the difference of breath difference (the difference between the expansion and reduction of chest circumference at the time of maximum inspiratory and expiratory) is only 4-8cm, and the maximum oxygen intake at the time of strenuous exercise is 2.5-3l/min, which is 10 times larger than that at the time of quiet; However, the vital capacity of swimmers can be as high as 4000-7000 ml, the breathing difference can reach 12-15 cm, and the maximum oxygen intake during vigorous exercise is 4.5-7.5 L / min, which is 20 times larger than that during quiet. It can promote the development of respiratory muscles, chest circumference and lung capacity. When inhaled, the alveoli open more and the ventilation is smooth, which is very beneficial to health. 4. Increase resistance
The water temperature of the pool is usually from 26 ℃ to 28 ℃. Soaking in the water can dissipate heat quickly and consume a lot of energy. In order to supplement the heat emitted by the body as soon as possible to meet the needs of the balance of heat and cold, the nervous system will react quickly to accelerate the metabolism of the human body, enhance the adaptability of the human body to the outside world and resist the cold. People who often take part in winter swimming are not easy to catch cold and cold due to the improvement of body temperature regulation function. They can also improve the endocrine function of human body, which is the increase of pituitary function, so as to improve the resistance and immunity to diseases.
5. Body building
When people are in the water, they usually use the buoyancy of water to lie prone or supine in the water, relax and stretch the whole body, so that the body can get a comprehensive, symmetrical and coordinated development, so that the muscle lines are smooth. In the water movement, the impact of the ground on the bone is reduced, the probability of bone aging is reduced, and the bone joint is not easy to deform. The resistance of water can increase the intensity of people's sports, but this intensity, unlike the equipment training on land, is very soft. The intensity of training is easy to control in the aerobic area, and will not grow a very stiff muscle block, which can make the whole body smooth and beautiful.
6. Enhance myocardial function
When people exercise in water, all organs participate in it, which consumes a lot of energy, and the blood circulation is also accelerated, so as to provide more nutrients for the moving organs. The acceleration of blood speed will increase the load of the heart, speed up its beating frequency, and make its contraction strong and powerful. People who often swim have excellent heart function. The average person's heart rate is 70-80 beats per minute, and the output per stroke is 60-80 ml. The heart rate of regular swimming can reach 50-55 times / min. many excellent swimmers have a heart rate of 38-46 times / min and a stroke output of 90-120 ml. When swimming, the function of water makes the blood of limbs flow back to the heart easily, which makes the heart rate faster. The long-term swimming will have the obvious cardiac motility increase, the contraction is powerful, the blood vessel wall thickness increases, the elasticity increases, each stroke output blood volume increases. Therefore, it can exercise a strong and powerful heart.
It can be seen from the above that in daily life, people can exercise as a common sports item, and in various sports methods, it is also a good choice.