Expanding information 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 conditions, the pressure will increase, and the speed of swimming will also increase the pressure load. The muscle tissue of atrium and ventricle can be strengthened, the volume of heart cavity can be gradually increased, and the beating times of heart can be reduced, so that the activity of heart can be preserved, but the whole blood circulation system can be improved. Diastolic blood pressure will increase and systolic blood pressure will decrease at rest, so the blood pressure value will become more favorable.
According to the statistics of relevant experts, the average person's heart beats about 66-72 times per minute in a quiet state, and the stroke output is about 60-80 ml, while those who take part in swimming exercises for a long time only need to contract about 50 times under the same circumstances.
References:
Baidu encyclopedia-swimming