Why are babys heart rate the fastest?

That%26#039;s a very interesting question...

The answer is in here:

http://hep.ucsb.edu/courses/ph6b_99/0111...

Why are babys heart rate the fastest?

1. Myocardium (heart muscle) is less compliant and stroke volume is limited (1.5 cc/kg/beat/minute versus 75-90 cc/beat in an adult). THUS, Heart rate rather than stroke volume increases to maintain cardiac output.

2. Infants have higher cardiac output than adults (200 cc/ kg/minute versus 100 cc/kg/minute).Increases oxygen needs. Leaves little cardiac reserve.