RHR not decreasing

[Seigniority]

I am currently not drinking alcohol and I’m getting 7-8hrs sleep a night. When I look at the sleep breakdown, by HR is regularly 70%+ below RHR during the night, and yet my RHR hasn’t decreased. It actually increased by 1bpm today! Normally my RHR will decrease by around 1bpm/day with data like this. I have been doing fairly intense exercise every day, but my HR recovers quickly. Obviously the heat will have an effect on my HR but, given that it’s regularly below during sleep, surely this would have a positive effect on RHR?

Can anyone explain how Fitbit calculates RHR and why mine is no longer decreasing? I am still within a healthy range, but I know that it should be going down. 

[alexthecat]

@Seigniority  I'm not sure how long you've been exercising regularly, but resting heart rate doesn't keep decreasing indefinitely. It may not be reasonable to expect your HRH to continue to decrease by 1 bpm every day. As you become more fit, it can take a lot of time and effort to get a significant change in your RHR.

It's a good idea to remember that resting heart rate isn't the only indication of health and fitness. Your Fitbit measures various health metrics. I try to look at all of those together to get a more balanced idea of what is going on with me physically. 

[SebWotan]

I would also add that the resting heart rate is affected by a lot of factors, a +1 BPM change is pretty insignificant and can be due to a lot of things: slightly more stress (either external or internal, such as your immune system fighting an intruder), change of room temperature, being more fatigued. My BPM is always fluctuating +/- 5 BPM around my average and this is normal.