A 24-hour ambulatory electrocardiogram averaging 56 beats/minute with no pauses and no premature beats is considered to be sinus bradycardia. However, if there is no particular discomfort, there is no need for treatment. Normal adult quiet state heart rate of 60-100 minutes, less than 60 times / min, belongs to the sinus bradycardia, young people, athletes or heavy physical workers, sleep state is common. Generally asymptomatic, occasionally palpitations, self-consciousness, heartbeat, heavy feeling and other manifestations. Asymptomatic people generally do not need treatment, regular ECG can be done. The average 24-hour dynamic electrocardiogram is 56 beats/min. If accompanied by palpitations and other uncomfortable symptoms, it is recommended to consult a doctor in time for diagnosis and treatment. Ensure adequate sleep, maintain emotional stability, and avoid excessive excitement and sadness.