The normal range of heartbeat per minute is 60-100 beats. The frequency of the heartbeat can be affected by many factors, such as strenuous exercise, emotional excitement, quiet sleep, etc. If the heart rate is greater than 100 beats per minute, it is called tachycardia. If the heart rate is less than 60 beats per minute, it is called bradycardia. If the heart rate is consistently below 50 beats per minute, it is called significant bradycardia and the cause of the bradycardia needs to be identified. If you are an athlete or have a long history of physical labor, your heart rate may be slightly slower, around 50-60 beats per minute.