I measure it pretty often, and consistently and I make sure to at the same times of the day and under the same conditions. I take my blood pressure often and t

I measure it pretty often, and consistently and I make sure to at the same times of the day and under the same conditions. I take my blood pressure often and that machine also measures it. That's actually how I first noticed it. For years my resting rate was always 52 like clockwork if I was like fully at rest for awhile and took a measurement. Now it's never lower than 60 and usually around the mid 60s. So I don't know. I went from it always being like 52-54 at rest, to I can't ever get a reading below 60 anymore, so I am pretty sure something has changed. The only thing I changed was going from an extremely sedentary lifestyle to a pretty highly active one. It's been a little over a year though since changing my activity lifestyle and noticing this change, and it hasn't seemed to change or go back down yet. I continue to take readings and use my same BP cuff so I should notice when I start getting readings into the 50s and low 50s again if I ever do. I mean I am not sure why it was ever so low before, when I was in pretty bad cardiovascular shape, but no doctor ever gave it any concern. The best I could find about how my heart behaved was something i've seen some call "aerobic deficiency syndrome". Yes my resting rate was low, but with even fairly light activity, my heart rate would skyrocket up fairly high and stay at that level while I maintained the activity. Like there was a big disconnect between how some people can use the test of whether they can easily hold a conversation to estimate their HR target level, but mine was way off that. I could easily hold a conversation yet my HR was 140+ I am 37 years old, and so Zone 1 or Zone 2 (where it's said you can comfortably hold a conversation) is around 92-110 (1) or 110-128 (2) bpm, but I could easily breathe and talk at 140+, so I knew something was up. Now after this year+ of consistent activity, my HR does not skyrocket up like this anymore under these light loads, and also comes down much faster.