Sinus bradycardia 57 beats/min is not normal for the general population; the heart rate 57 beats/min is normal for long-term physical laborers and athletes. The normal range of heart rate is 60~100 beats/min, the frequency of adult sinus rhythm <60 beats/min is sinus bradycardia, so the heart rate 57 beats/min is not normal. In general, the heart rate of 57 beats/minute may be caused by sleep, sinus node dysfunction, hypothermia, hypothyroidism and other diseases. Long-term physical laborers and athletes are physically fit, the heart ejection capacity is strong, the number of heart beats is relatively lower than normal people, so their heart rate of 57 beats / min is a normal physiological phenomenon. Patients with bradycardia are recommended to undergo dynamic electrocardiographic monitoring. If other symptoms such as malaise, weakness, poor mental performance, decreased labor endurance, recurrent episodes of lightheadedness, feeling that objects around them are spinning, or any other serious, persistent, or progressive symptom occurs, it is recommended to seek medical attention to find out the cause of the disease and standardize treatment in a timely manner.