1, improving vital capacity and respiratory function;
Breathing mainly depends on the lungs, and the strength of lung function is determined by the strength of respiratory muscle function. Exercise is one of the effective means to improve and increase vital capacity. Swimming makes people develop respiratory muscles, increase chest circumference, increase vital capacity and open more alveoli when inhaling, which is very beneficial to health. Therefore, regular swimming can increase the strength of respiratory muscles and improve the function of respiratory system. The most obvious example is the value of vital capacity. A swimmer's vital capacity can reach 4000 to 6000 ml, or even 7000 ml, while the average person only has 3000 to 4000 ml.
2, improve the cardiovascular system:
Swimming plays an important role in improving cardiovascular system. The stimulation of cold water can promote blood circulation through heat regulation and metabolism; In addition, the pressure and resistance of water also play a special role in the heart and blood circulation. When swimming on the water, the water pressure on the body has reached 0.02-0.05 kg per square centimeter. When diving, with the increase of depth and the change of physical condition, the pressure will increase, and the speed of swimming will also increase the pressure load, so that the muscle tissue of atrium and ventricle will be strengthened, the volume of heart cavity will gradually increase, and the number of beats of heart will decrease.
3, improve the ability of the muscle system
Swimming is a whole-body exercise, which can mobilize more muscle groups to participate in metabolism and energy supply than other sports, and improve the strength and coordination of many muscles, especially the muscles of trunk, shoulder straps and upper limbs. Because swimming in water needs to overcome great resistance, long-term exercise can improve muscle strength, speed, endurance and joint flexibility. At the same time, it improves flexibility. Because swimming has a wide range of physical activities, people who swim often become more flexible and soft. Moreover, the correct swimming technique requires the muscles to stretch before the contraction force, which is conducive to continuously improving flexibility and strength.
4, strengthen skin blood circulation
In the process of swimming, due to the stimulation of water temperature, the body in order to ensure adequate temperature. Skin blood vessels play an important regulatory role. Stimulation of cold water can make skin blood vessels contract and prevent heat from spreading outward. At the same time, the body will intensify the generation of heat, dilate the blood vessels of the skin and improve the blood supply of the blood vessels of the skin, so that long-term exercise can strengthen the blood circulation of the skin. Because of the action of water waves, the skin is constantly rubbed against the human epidermis, so that the skin can be better relaxed and rested, so people who often take part in swimming exercises have smooth, fair and soft skin.
5, enhance resistance
The water temperature in the swimming pool is often 26 to 28 degrees, so soaking in water dissipates heat quickly and consumes a lot of energy. In order to supplement the heat emitted by the body as soon as possible and meet the needs of cold and heat balance, the nervous system reacts quickly, accelerating the metabolism of the human body, enhancing the adaptability of the human body to the outside world and resisting the cold. People who often take part in winter swimming are not easy to catch a cold because of the improvement of body temperature regulation function, and can also improve the endocrine function of human body and increase the function of pituitary gland, thus improving the resistance and immunity to diseases.
In short, swimming has many benefits, and long-term persistence can improve various functions of the body. It should be noted that try to choose a regular swimming pool and pay attention to safety.