The normal heart beat of a neonate is 130, older child 100 and adult 60-101. The acceptable recovery time after an exercise can be calculated after knowing the maximum heart rate after exercise. This is calculated by the formula

HR

It means if your age is 40 years then your heartbeat should be 180. There are some more reliable formulas. For their details, Visit Heartbeat.

HR

_{max}= 220-ageIt means if your age is 40 years then your heartbeat should be 180. There are some more reliable formulas. For their details, Visit Heartbeat.