Harvard Heart Letter

Is a low heart rate worrisome?

People who are very fit often have low resting heart rates.
Image: Thinkstock

Ask the doctor

Q. I've read that a normal resting heart rate is between 60 and 100 beats per minute. Mine runs around 45 to 48. Should I be concerned? I have been a runner for 42 years and have completed seven marathons.

A. Unless you feel tired, dizzy, or weak, there's usually no cause for concern, especially because it sounds like you're in good physical shape.

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