What is the best sport?

Nowadays, most people pay great attention to physical exercise. Many children are asked by their parents to exercise more and strengthen their bodies since childhood. Swimming is a sport that people like very much nowadays. Many children have started swimming when they were very young. Well, next, I will tell you some relevant information about swimming, which is the best sport.

Effect on cardiovascular system: Swimming plays a very important role in improving the cardiovascular system. The stimulation of cold water can promote blood circulation through heat regulation and metabolism; in addition, the pressure and resistance of water during swimming also play a special role in the circulation of the heart and blood.

When swimming on the water surface, the density of water is more than 800 times that of air. When a person stands in chest-deep water, the chest cavity has to withstand a squeezing pressure of approximately 12-15kg/cm2. This is due to the high density of water. Under water, the pressure increases by 0.1 kilograms for every meter of descent. The water pressure that the body is under has already reached 0.02-0.05kg per square centimeter. When diving, the pressure will increase with the increase in depth and the change in physical conditions. The increase in swimming speed will also increase the pressure load.

The muscle tissue of the atria and ventricles can be strengthened, the capacity of the heart cavity can gradually increase, and the number of heart beats can be reduced, so that the heart's activity can be economical, and the entire blood circulation system can be improved. In the resting state, the diastolic pressure increases and the systolic pressure decreases, so the blood pressure becomes more favorable; the elasticity of blood vessels is also improved. According to statistics from relevant experts, the average person's heart beats about 66 to 72 times per minute in a resting state, and the stroke volume is about 60 to 80 ml. However, for people who participate in long-term swimming exercises, the heart contracts about 50 times under the same conditions, and the stroke volume reaches 90 to 120 ml.

The above is a detailed introduction to the best sport of swimming that people like very much. Swimming is a very good sport that people can do in their spare time. And swimming is also very helpful for weight loss. In general, swimming is a very good sport.