In August/Sept I got back on the bike after a little break due to some health issues. As soon as I got into my training schedule, nothing too intense maybe 50-60 miles a week my RHR went down to 58-65. I was taking it on my wrist and definitely could feel it was beating about 1 time a second maybe even a little slower at times. I could take it after coffee in the morning or before, it would still be low.
In the last month or two I've noticed it has been higher, when I felt it on my wrist. I didn't make much of it until someone told me it could be a sign of over training, a few days later I ended up getting light over training. I took a week off and have gone pretty lightly recently and today I took my RHR in the morning and it's in the high 60's to low 70's, definitely a bit higher than it used to be. It's nothing that is too alarming but it definitely feels much faster these days then it did when i first started training.
Does anyone have any idea, for other reasons I've recently cut back my coffee intake to one mug in the AM, so I doubt it's caffeine related. I just recently got a HRM and have been trying to take my RHR when I wake up in the morning but it's typically pretty bad unless you're sweating so I end up rarely getting a reading. When I do it's usually fluctuating between 65-78.
I know this is one of those questions with a million answers but anyone with any ideas please let me know, I'm curious. I've cut my miles per week back from like 150-190 down to about 60-100 and definitely have been taking more time for recovery. One other thing is that I've been under a lot of stress in the last 2 months between work and other things, this is my guess but I'm not sure.