Is there a floor of 38 bpm in Fitbit Charge 6?

[warpi]

I have been using my Fitbit Charge 6 for three weeks and I am impressed. However, I suspect that there is a heart rate floor built in the watch since when I reach this pulse in the night, it become almost like a floor. It could be for like 40 minutes. More realistic would be if it is going from 37 to 38 I guess? Also, I suspect that if it does have a floor of 38, the REM-sleep calculation will not be correct. Something which I have very little of according to the watch...

Does anyone know if the Charge 6 have a heart rate floor of 38?

[warpi · Accepted solution]

Now I have simulated a pulse below 38 and found that Charge 6 is not able to register it. When pushing below 38, the watch starts to jump all over the place. (I used the homepage https://www.trickmywatch.com/, and tweaked the javascript so that it is possible to set a value below 60 (update: function () { app.freq = 35;). You also have to set it to Charge and increase steps to max).

[LZeeW]

Hello @warpi and welcome to the Community.  I found an article in the Fitbit Enterprise Blog that lists 30 bpm as a floor for Fitbit's OHRM.  Different Fitbit models can have slightly different OHRMs, but I believe that 30 bpm is required across models.  Fitbit used to list 30 bpm in their Help article.  I don't have personal experience with a Charge 6.  But I have recorded 36 bpm with my Sense 2.