There are two reasons for bradycardia: congenital inheritance: some people are born with bradycardia. For example, the VT 1 of top marathon runners can be changed to the VT 1 of ordinary athletes, and the arrival will be delayed. The players trained the day after tomorrow, because of long-term practice, myocardial hypertrophy. Diastolic period of cardiovascular system increases, and blood supply zone increases. Pump enough blood, take enough oxygen, and the heart rate naturally becomes slower and slower. After a period of aerobic training, the resting heart rate of ordinary people will slow down. This is also an integration of aerobic exercise to lose weight. Finally, a slower heart rate does not mean unhealthy.

It means that the cardiovascular system becomes stronger. Aerobic endurance exercise leads to some changes in cardiovascular function, including a large increase in preload, an increase in stroke output and a decrease in resting heart rate. In addition, the relative density of capillaries in muscle tissue will be increased by aerobic endurance exercise to help transport O2 and eliminate CO2. To achieve good sports performance, it is very important to improve the maximum oxygen uptake. One of the key systems to improve maximal oxygen uptake is to improve the cardiovascular function of nerve center.

The release rate of normal sinoatrial node is 60~80bpm, and the release rate of aerobic endurance exercise is obviously reduced due to the improvement of sympathetic nerve efficacy. An increase in stroke output can also endanger a calm heartbeat. Every time the blood produced by the cardiovascular system increases, only a few frequencies must be turned off to achieve the same preload. There are some excellent players whose quiet heartbeat can reach 45bpm.

Because of the player. In the long training. Physical fitness is much stronger than the average person. What sports culture can do is to inhale steadily. In non-maximum effort exercise, showing a lower heart rate is another feature of aerobic endurance exercise. Under the same workload, the heart rate of trained athletes rises more slowly than that of sedentary athletes. Because the maximum heart rate may decrease due to the improvement of sympathetic nerve efficiency, the main factors that reduce the center rate of non-maximum effort fitness exercise are left ventricular hypertrophy and the improvement of convergence.