Physical exercise has a positive impact on young people of the cardiovascular system :
All human life activities are inseparable from the heart. Continue to have regular cardiac contraction, blood circulation through the delivery of oxygen and various nutrients needed by the body to body tissues and organs, in turn transported the body to produce carbon dioxide and waste in the metabolic process to the lungs, kidneys, skin etc. excreted. Cardiac hard for people to work with, even when sleep is also working with, it is a heavy burden. For example, a person's life expectancy is seven years old then, the heart beats per minute on average 60 to 80 times, beating once every 50 to 70 ml of blood is discharged, then his lifetime, the heart beats 2.7 billion times a total of about two million liters of blood discharge . Discharge of blood per minute heart about 4.5 to 5 liters of blood, discharging 70 tons a day and night for about a year discharge 2,600 tons of blood. Connected to the heart with blood, blood vessels arteries, capillaries and veins three categories, in the blood circulation during each play a different role. It was calculated that the body of various types of vessels together enough to have 100,000 km long. Blood flow velocity in the veins quickly, the heart rate of a few meters per second spray of blood, blood circulation week, need 20-25 seconds quiet, just 6-8 seconds strenuous exercise. Press the 60-year period, the blood flow through the distance is about 150 million kilometers, equal to around the Earth 375 weeks. Adult heart a little larger than his fist, weighing approximately equal to the weight of 200, the average person about 300 grams. Seen only a very healthy heart to do the job.
Purports to heart health, it should start from the children and teenagers. Myocardium in the first five years of rapid growth in early childhood, before the sharp increase in the volume of the heart into the childhood, elastic fibers gradually spread to the myocardium. To puberty heart development into the second peak of up to 10 times its weight at birth, post-puberty up to 12-14 times the birth. In the 11-year-old girl, 14 years old boy in the heart of the most significant volume growth, then the correct physical exercise, the heart of the children to make good development.