The normal range of heart rate in young people is 60-100 beats per minute. 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. For athletes or people who play sports for a long time, the heart rate can be a little slower, around 50-60 beats per minute. If the heart rate is less than 50 beats per minute, the bradycardia is significant and can cause dizziness, blackness, upright hypotension or even syncope. When monitoring heart rate, pay attention to the quiet state, emotional excitement, mental tension, anxiety, etc. can affect the heart rate.