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RHR/BPM Super flawed

I really think the way average RHR is calculated on fit bit is super flawed.

 

Over the summer my heart rate was between 59-61, i was quite active, walks etc

 

The last 3 weeks ive been working out 4 times a week and my RHR has increased 63/64

 

Now, isnt exercise over time meant to make your heart stronger and not need as many BPMS?

 

Basically if you work out you have a higher BMP.RHR compared to someone who just sits down all day and doesnt exercise. That for me doesnt sit right

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There is nothing flawed about it; all your Fitbit is doing is reporting what it sees.  As for what your heart rate is supposed to do when you exercise, yes, over time a gradual decline in your RHR will happen, however, it won't necessarily happen overnight, and in the grand scheme of things, three weeks of exercise is practically yesterday.

 

FWIW, about a year ago I was nearing the end of what turned out to be a 4-year hiatus from regular exercise due to a series of injuries and medical issues, the most recent of which was a long-haul case of COVID.  I just checked, and on 12-Oct-2020 my RHR was 50 and for the month or so prior it had been hovering a beat or two either side of 49 bpm; I started exercising a year ago next week and for the next six or so weeks after that, my RHR worked it's way up into the 55-57 bpm range before gradually starting to decline.  By January I was roughly where I started in October, and by March my bpm was in the mid-40s; now, a year later my RHR is typically a point or two either side of 38.

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