Good question, as you know I'm having some issues with this at the mo, 44 was my lowest this week, and I vary throughout the day around 48's. 46 was recorded with the DN on Monday.
Customer helplines that use recorded menus that promise to put me through to the right person but never do - and being ill. Oh, and did I mention customer helplines :)
About 110 before I was diagnosed, and now at 80-85 on bisoprolol. No cause has been found for my fast heart rate... but still, they insist on looking for one lol.
I have been around 48 for years but am certainly no athlete. It turned out I was hypothyroid and bradycardia is a very common symptom indeed. I still haven't managed to get it up much, but average 55. Also basal body temp has gone up, from 36,2 to 36,7.
That 220 minus age is a load of ******** though. Very much dependent on exercise mechanism as well. Cycling gives me much lower HR than running which is much lower than rowing for the same output, all depends on a whole load of external factors plus muscle mass involved
My usual resting heartbeat is 72bpm. Has been for years and doesn't seem to change with weight loss/gain. However, it can go up to about 80 and sometimes as low as 60.