Heart Rate Monitor during exercise

[helsbels91]

Hi, I’ve started to notice that my fitbit isn’t always logging my heart rate when I’m exercising so the end result isn’t correct. It has been way out this morning saying I hadn’t reached cardio zone on a half an hour run.. which I know isn’t right.

Does anyone know how to fix this? ☺️

Thanks! x

[MrMarv]

@helsbels91 -

Is it possible that you are not aware that the heart rate zone definitions have changed with the latest firmware release?

The Heart Rate Zone calculations have moved from the Traditional formula which are straight fixed percentages (50, 70 and 85%) of your Max Heart Rate which is defined as subtracting your age from 220. For me, as a 68 year old male, my Max Heart Rate is 152. Traditional zone values for me are shown in the first data row below.

The new formula being used by many FitBit devices, including the Versa Family of smartwatches as of the latest release, use a value called Heart Rate Reserve. Subtracting your resting heart rate from your max heart rate results in that reserve.

40% of the reserve is added to your resting heart rate to establish the beginning of the Fat Burn Zone.

60% of the reserve is added to your resting heart rate to establish the beginning of the Cardio Zone.

85% of the reserve is added to your resting heart rate to establish the beginning of the Peak Zone.

The new Heart Rate Reserve formula zones for me are shown in the second data row below.

Hopefully the above helps and if you were already aware, my apologies - either way, welcome to the boards.

[CindiLi]

Hi, Yes this is a new feature but I don't like it as it doesn't accurately reflect cardio anymore, traditionally at 70-85% of MHR.   @MrMarv has a fix for this in the following thread 🙂

https://community.fitbit.com/t5/Other-Versa-Smartwatches/Heart-rate-zone/m-p/4462591#M215022

[helsbels91]

Thank you so much for this reply, I really appreciate it ☺️

[helsbels91]

Thank you so much ☺️ x