It depends. Genetics can trace back to whenever and find that everyone has a different pulse rate, because they have high or low blood pressure.
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The average resting Heart Rate for 10 year olds is 72 Beats per Minute (BPM)
6-12 year olds have the pulse of 75- 110 per second
Heart rate and blood pressure will always increase during physical activity. If thats what you're talking about.
What the medical field considers a normal, resting heart rate in a healthy adult is between 60-100 beats per minute. So a heart rate of 66 in a healthy 19 year old adult is normal if 60 and regular.
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