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Abnormal bradycardia is usually related to medication (beta-blockers or Ca++ channel blockers), a condition called sinus node dysfunction (Sick Sinus Syndrome), or "heart block" of some form. Pseudo-bradycardia can occur if you are having non-perfused premature heart beats (PVC's).
It sounds like you have a normal activity associated heart rate range and no symptoms that I would identify with a pathological condition. Low resting heart rates like that are normal for fit individuals with a genetic predisposition. It appears unlikely that you have anything to worry about.
By the way, the algorithm for max HR calculation is for sedentary, unconditioned individuals. Fit individuals can usually attain higher max rates.
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Steve
Sapere aude
1983 3.4L 911SC turbo. Sold
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