Low heart rate variability on Charge 5

[MaryK56]

Why does my fitbit charge 5 say my hrv is within my personal range, yet upon reading on normal levels it says mine are extremely low even causes death?? It's always fluctuating between thirteen and twenty two. It cannot be right. That's crazy. 

Moderator edit: edited title to clarity

[CrisVillaFitbit]

Hello, @MaryK56 Welcome to the Fitbit Community!

Thank you for letting me know about your low heart rate variability, I understand this can be alarming. The personal range is based on your recent data on up to 30 days. but there are some factors that can impact the heart rate tracking and it's variability per se.

I would recommend you to check the following and let me know if the situation persist after that:

-  Use your wristband in a way it doesn't move. For more information, check this article.
- Use the wristband that came with your Charge 5.
- When working out, use the Training App and turn on GPS.
- Restart your Charge 5.

[alexthecat · Accepted solution]

@MaryK56 I've used a Polar chest strap to measure HRV and found the numbers that I get from my Fitbit to be very different. That does make sense to me because they are different devices and they measure HRV differently.

Most people consider the chest strap to be the gold standard for heartrate measurement and I agree with that. While my Fitbit doesn't agree with the chest strap in terms of absolute numbers, the overall trends do mirror one another. Based on that, I would suggest looking at how your HRV is changing over time and not put too much emphasis on a particular number on a given day. 

[MaryK56]

Ty I will try the suggestions given

[MaryK56]

OK ty. Mine has logged between 14- 23ms for 2 months everyday, since I first got it though. 

[MaryK56]

This is a 3 month average on my hrv. This is my concern as to accuracy.