The resting heart rate of normal adults has significant individual differences, with an average of about 75 beats/min (between 60- 100 beats/min). Heart rate may vary with age, sex and other physiological conditions. The newborn's heart rate is very fast, reaching 130 beats/min or more. Among adults, women's heart rate is generally slightly faster than that of men. The same person's heart rate slows down when he is quiet or sleeping, and increases when he is exercising or excited. Under the influence of some drugs or neurohumoral factors, his heart rate will increase. People who often engage in manual labor and physical exercise usually have a slow heart rate. In recent years, a large sample study of healthy people in China found that the normal range of resting heart rate in China is 50-95 beats/min for men and 55-95 beats/min for women. Therefore, the heart rate varies with age, sex and health.
A normal person's heartbeat is less than 60, which is called bradycardia. There are several types of bradycardia, the most common being sinus bradycardia. Sinus bradycardia can be divided into pathological type and physiological type. Physiological sinus bradycardia is normal. Generally, the heart rate and pulse rate are 50~60 beats/min. The athlete's heart rate may be 40 times, which is very common in normal people with more sleep and physical activity and does not need treatment. When the heart rate or pulse is 40 beats/min to 50 beats/min, it is generally considered as sinus bradycardia. It can be seen in athletes who have been engaged in heavy physical labor for a long time; Pathological manifestations are hypothyroidism, increased intracranial pressure, obstructive jaundice, digitalis, quinidine or propranolol overdose or poisoning.