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For example my heart rate right now says 95 on the Fitbit. I took my pulse for 15 seconds and multiply by 4 which came to 80. I checked my Fitbit again and it said 80. It almost almost always adjust down after I take my pulse. When I exercise I’ll check my Fitbit and it will say 115 then all of a sudden it will say 130 then 120. This is al while I’m doing the same speed etc. it wasn’t doing this a few months ago. Is it something with my heart rate or is it the Fitbit. I have a dr appt but just getting and opinion on it. I have had the Fitbit a year. I just took it 3 times on my phone app and it was 85 (I exercised about an hour ago). And then my Fitbit matches but when I check it again a few minutes later it is higher.
Personally, I'd put more faith in a professional's expertise and monitoring equipment than in some $30 electronic gadget. If your GP detects or suspects an arrhythmia they can fit you with an ambulatory heart monitor (such as a Holter Monitor or ZIO Patch) for a couple of weeks.
My Garmin MARQ Expedition seems accurate, just did the same thing and compared hand measurement to what the device indicates. It usually doesn't leave my wrist other than a hour or three to charge every N days. I'm more interested if accuracy is consistent over time: like a scale that's off a bit, if it's consistently off I'm okay with that. There must be a statistical term to what I'm describing: confidence interval, perhaps standard deviation, perhaps an average. Call it margin of error for short.
Ain't gonna stop me from wearing it: the data generated around steps, calories burned, heart rate, all that is helping my ND and I measure my overall health along with various other data.
Personal device telemetry gets better over time, I'm guessing in 20 years we'll have tons more measured at all times. This tech is still in its infancy I feel. Heart rate was new for Garmin wrist devices about five years ago, then Ox level, and there's more that other watches from Apple and etc. do. The Garmin measures my sleep, too, and like the above I can't speak to its "absolute" accuracy as-yet.
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