I have similar high 40&#x27;s bpm and had a similar experience with my doctor sending me for all manner of tests.  All okay.  He claimed, and the article seems to back him up, that unless I was a marathoner (I&#x27;m not) my heart rate should not be that low.  I do high intensity (for me) exercise 3-4 times a week at about an hour a crack.  There may be congenital component as both my brothers have low resting pulse and neither is as active as I.<p>I use the FitBit Charge HR after moving over from the version 1 Microsoft Band which had corroded under the onslaught of my profuse sweating after 10 months use.  I found the Charge HR MUCH more accurate than the Microsoft Band for heart rate.  Neither as accurate as the Azumio Heart Rate android app, but the Charge HR good enough for my own workout tracking.