Attachment: Aerobic exercise
Aerobic exercise is based on heart rate. Most people agree that the maximum heart rate =(200- age) 80-90% is the upper limit, usually 60-80%. 15- Exercise for 30 minutes at a time can accelerate blood circulation and promote metabolism.
At ordinary times, the heart rate is 70-80 times per minute, and the blood discharged by each contraction of the heart is about 60 ml, and * * * discharges 4200-4800 ml per minute. According to the heart rate of aerobic exercise, the blood output per minute of the heart is about twice as much as usual.
But the higher the heart rate, the shorter the myocardial rest time, and the heart is prone to fatigue. In addition, when the heart rate is high, the diastolic time of the heart may be so short that the blood cannot be completely filled, so when the myocardium contracts again, the amount of blood discharged decreases. So simply raising the heart rate is not ideal. Even so, the purpose of raising the heart rate is to reduce the usual heart rate to about 60 beats per minute, thus prolonging life. This is a new achievement of life science research. However, the heart rate should be moderately increased to avoid heart fatigue and myocardial strain and cause heart disease. Long-term overtime high heart rate exercise (such as 10 thousand meters running) is very harmful to health.
It is a better way to increase the blood volume discharged by the heart every contraction. For example, squatting can effectively exercise the heart and make the heart produce strong contractility and relaxation. Therefore, it is a good strategy to improve the function of circulatory system to accelerate the heart rate and strengthen myocardial movement. In fact, the heart rate of strength training is not low, generally reaching 120 times per minute. For example, a quick squat with a small load can achieve this goal, which not only improves the heart rate, but also develops muscle lines.
The relationship between aerobic exercise and breathing shows that the depth of breathing has an influence on aerobic metabolism. High heart rate, shallow breathing and less oxygen intake each time; If your heart rate is low, you will take a deep breath and inhale more oxygen each time. It is best to take a deep breath (squat) with weight and exercise vital capacity. The increase of vital capacity is similar to the increase of cardiac output, that is, more oxygen is inhaled and more carbon dioxide is discharged with each breath. Long-term practice of squat can make breathing deep and long when quiet, and the number of breaths per minute can be reduced to 8- 10. Deep and slow breathing allows you to have a long rest time after each breath, and it is not easy to get tired.