Hello, it is not recommended to do heavy work after heart bypass surgery. Precautions for exercise after heart bypass surgery: Exercise prescription must be made for rehabilitation exercise after coronary artery bypass surgery. Because patients with coronary artery bypass grafting have different preoperative symptoms and different levels of cardiac function, it is necessary to have individualized guidance and rehabilitation exercise by medical staff after operation. Any exercise prescription should be formulated according to factors such as disease diagnosis, health status, functional status of cardiovascular and motor organs, age, gender, exercise history and hobbies. According to the recovery after coronary artery bypass grafting and whether there are complications, choose the appropriate exercise mode and amount. In a word, the rehabilitation exercise prescription should emphasize individualization. Exercise prescription is also called training exercise plan. The rehabilitation exercise of patients after coronary artery bypass grafting must make exercise prescriptions, which should be carefully aligned as drug prescriptions. Exercise prescription includes exercise type, intensity, duration, frequency and progress speed. (1) Exercise type: The purpose of rehabilitation exercise is to obtain and maintain normal physical activity ability. Whether this effect can be achieved depends on several basic factors, including cardiopulmonary tolerance, body structure (percentage of fat in body weight), muscle strength and endurance, and joint flexibility. The most important thing for patients after coronary artery bypass grafting is to enhance the tolerance of heart and lung. Aerobic endurance activities can improve heart and lung endurance, which are divided into two groups: the first group: physical activities are characterized by low exercise intensity and small heart rate change, such as walking, jogging, climbing stairs, riding an exercise bike, doing various fitness exercises with various equipment training, playing Tai Ji Chuan with relics, dancing Tai Chi sword, etc. The second group: Physical activities are characterized by physical activities that are persistent and difficult to maintain, such as dancing, games, ball games and other activities. (2) Exercise intensity: Exercise intensity refers to the amount of exercise in a certain period of time. Improving the endurance of cardiovascular system requires a certain intensity of exercise. Exercise intensity needs proper monitoring to determine whether it is appropriate, which is the most difficult part of designing exercise prescription. In medical rehabilitation, exercise intensity can be determined according to metabolic indexes such as heart rate, maximal oxygen uptake and degree of consciousness fatigue. Among these indicators, the maximum oxygen uptake is the most difficult to achieve. The relationship between heart rate and exercise intensity is linear and proportional. However, patients after coronary artery bypass grafting should take drugs for a long time, such as calcium antagonists, which have an impact on heart rate and cannot objectively reflect exercise intensity. We suggest that patients after coronary artery bypass grafting should use the level of talking exercise to master the intensity of exercise. Talking about the level of exercise: talking during exercise, without obvious shortness of breath, is an exercise intensity suitable for training. If you can sing during exercise, it means that the exercise intensity is not strong enough. (3) Exercise duration: refers to the time required for a rehabilitation training. It can be divided into three stages: adaptation activities, cardiopulmonary endurance training and relaxation activities. The time required for the three stages is: 5- 10 minutes; 20-30 minutes; 5- 10 minutes. Adaptive activities include joint flexion and extension, and gradually increase the amount of exercise. It can avoid sudden high-intensity exercise of myocardial ischemia and prevent muscle and joint injury. For patients with poor health after coronary artery bypass grafting, adaptive activities should be extended appropriately. Cardiopulmonary endurance training is intensive, so the time for patients who take part in exercise for the first time should not exceed 10- 15 minutes. Relaxing exercise is to reduce the discomfort after exercise. At the beginning of relaxation exercise and during the activity, the heart rate should quickly return to normal. If the heart rate recovers slowly during relaxation exercise, the intensity of exercise should be reduced appropriately according to the situation. (4) Exercise frequency: Exercise after coronary artery bypass grafting. At first, we suggested intermittent exercise. Intermittent exercise takes place alternately with exercise and rest, but the cumulative exercise time shall not be less than the prescribed continuous exercise time, and the time ratio of exercise and rest is 1: 1. The advantages of intermittent exercise in patients with coronary heart disease are: 1) Patients achieve higher exercise intensity and less fatigue, because unlike continuous exercise, lactic acid accumulation can be reduced at rest. 2) There are many times of stimulation for heart training, mainly because we can repeat the political views on cardiac stroke volume, venous reflux and intracardiac pressure. Exercise frequency refers to the number of rehabilitation exercises per week. In order to achieve the expected effect of rehabilitation exercise, patients should exercise at least three times a week, and the interval between two exercises should not exceed 2 days. Patients who participate in exercise three times a week can improve their cardiopulmonary endurance to some extent after 2-3 weeks, and usually have a significant improvement after 6-8 weeks. At the same time, we emphasize that patients undergoing coronary artery bypass grafting must insist on exercise to maintain the effect of exercise. If the number of exercises is reduced to 1 time per week, the acquired cardiopulmonary adaptability will disappear by half within 10 week. If the activity is completely stopped, the patient will lose all the cardiopulmonary endurance gained within 5 weeks. 3) Progress of the exercise plan: The progress of the exercise plan depends on the individual's maximum physical ability, health status, age and goals. Cardiopulmonary endurance of exercise prescription can be divided into three stages, namely initial stage, improvement stage and maintenance stage. I hope the above reply is helpful to you.