Resting heart rate for a 16 year old
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No, it's not normal. Resting heart rate (taken while you are sitting or lying down for a minute or so) should be in the 60-70s, while a BPM in the 80s is still clinically normal, anything over 90 is not. In fact, tests for intoxication from stimulants like cocaine, amphetamine or from marijuana use anything over 90 pbm as a bioindicator for being under the influence of a drug. You should seek medical advice. High heart rate is often associated with high blood pressure which is a risk factor.
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At your age the average heart rate is 60-100 so yes it is normal but on the high end.
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Are you a smoker?
Are you overweight?
Are you overweight?