As we all know, moderate exercise can promote the metabolism of the body, which is beneficial to health, while excessive exercise is counterproductive. Some time ago, Ms. Zhang, a 34-year-old Nanjing white-collar worker, had a sudden cardiac arrest. According to news reports, Miss Zhang usually likes sports. She went to the gym to exercise and lose weight as usual. Sweating for an hour, I suddenly fell to the ground at the end of the course and my heart stopped breathing. The gym staff panicked and rushed her to a nearby hospital. The emergency doctor quickly rescued, kept pressing the heart and sent it all the way to the emergency room. After two hours of continuous pressing, Miss Zhang finally got a heartbeat. However, she has not fallen to the ground for 20 minutes and was taken to the emergency room.

Due to long-term ischemia and hypoxia, the heart function was extremely poor, and he was transferred to ICU intensive care unit, and even went to extracorporeal membrane oxygenation (extracorporeal membrane oxygenation device). After 20 days of active and meticulous treatment by hospital doctors, she is now fully awake, able to communicate with people normally and receive lower limb rehabilitation treatment. The director of the Department of Critical Care Medicine who participated in the treatment said that there was a "golden four minutes" rescue time after the cardiac arrest fell to the ground. At normal room temperature, after 4 minutes of cardiac arrest, brain cells will be irreversibly damaged. If the time exceeds 10 minutes, even if the rescue is successful, brain death may occur.

After all, Miss Zhang's heart stopped beating for two hours, but she was successfully cured and her consciousness returned to normal. On the one hand, she received cardiopulmonary resuscitation in a short time after falling to the ground, and the rescue was very timely. On the other hand, youth and good physical fitness are also important factors. After a long period of epidemic isolation, many people now choose the "revenge" campaign, regardless of what they can do, and accept sports beyond their physical strength. In this regard, experts remind that excessive exercise is not desirable and must be moderate. So, how to do "scientific" exercise to protect the heart known as the "engine" of the human body?

The characteristic of aerobic exercise is that the supply and demand of blood oxygen can be balanced during exercise, that is to say, the fuel supply is just right and the engine can work in a balanced and stable state. Aerobic exercise is an effective way to maintain the heart, which usually includes brisk walking, jogging, swimming and cycling. Doing less anaerobic exercise Anaerobic exercise refers to the risk of angina pectoris and myocardial infarction in the elderly due to high-speed strenuous exercise of muscles in the state of "hypoxia". Moderate exercise is also important. Exercise intensity can easily lead to injury and even crush the heart. To judge whether one's activity intensity is appropriate, one can use subjective indicators and objective indicators:

In terms of objective indicators, the suitable heart rate for exercise is 170 years old, so we should pay attention to the detection of heart rate during exercise and try not to exceed 140 beats/min. Subjectively, if you can speak effortlessly and keep smiling after exercise, it means that the exercise intensity is appropriate. In addition, we should pay attention to the frequency and time of exercise: for example, it is recommended to run for more than 0/5 minutes, preferably 30-60 minutes, about 3 kilometers, 5 times a week.