The normal range of heart rate is 60~100 beats/min, and 66 beats/min is normal.
The normal heart rate for adults is 60-100 beats/minute when they are quiet and awake. Older adults and women generally have a slightly slower heart rate, while children’s heart rate is slightly faster, especially for children under 3 years of age, where it is often >100 beats/minute. A heart rate of 66 beats per minute is the normal adult heart rate.
If the adult heart rate is <60 beats/minute, it may be due to physiological bradycardia in the elderly, athletes, or pathologic causes such as hypothyroidism, etc. If it is >100 beats/minute, it may be due to exercise, consumption of strong tea and coffee, etc., or it may be due to hyperthyroidism or tachyarrhythmia.
Heart rate is one of the indicators for assessing the heart and systemic blood circulation. If there is any abnormality, you should consult a specialist in time and follow the doctor’s instructions for further examination and treatment.