Acute myocardial infarction is due to acute occlusion of the coronary artery and coagulative necrosis of the myocardium due to severe ischemia. The pathological process is myocardial interstitial congestion and edema, accompanied by inflammatory cell infiltration after 24 hours, granulation tissue appears after 3-7 days, granulation tissue starts to be replaced by fibrotic tissue in 1-2 weeks, basic fibrosis of granulation tissue in 3-4 weeks, and scar healing in 6-8 weeks. Granulation tissue is an important sign in the process of myocardial infarction tissue repair and healing. Based on the pathophysiological changes of myocardial infarction, patients must ensure adequate rest after acute myocardial infarction, and bed rest within a certain time frame in the early stage of the disease is beneficial to the recovery of myocardial infarction patients, and the rest period generally takes 4-8 weeks, but should be treated differently depending on the size of the infarct and the state of the heart. Because when resting quietly, the basal metabolism decreases, which is beneficial to the recovery of the disease, bed rest reduces the cardiac load and promotes the balance of myocardial oxygen supply and consumption, which can avoid inducing or aggravating cardiac insufficiency, and the sympathetic excitability decreases when resting quietly, which can prevent and reduce the occurrence of arrhythmia, and also reduce and avoid the occurrence of ventricular wall tumors induced by inappropriate physical activity, and even heart rupture. However, bed rest is not the same as not moving at all in bed. After about 2 weeks of illness, you can gradually move around in bed under the guidance of your doctor, and later transition to off-bed activities.