Incorrect HRV Values
closed
Maximo Chaio
I’ve compared several days between Athlytic, Oura and Bevel and Bevel always seems to be further from Oura’s hrv. I thought this was due to Apple Watch taking fewer measurments than Oura. However, ever since Ahtlytic's RMSSD update, it seems to very closely match Oura and Whoop's values. I want to know if something can be done about it, as HRV is one of the most important values of the app.
Canny AI
Merged in a post:
HRV is regularly off by 50+ when compared to Oura and Whoop.
Elias Malek
I have been using Bevel for a month now and my HRV (both rMSSD and SDNN) seem to be off from Oura and Whoop. I know Oura and Whoop both use rMSSD, like Bevel, so I am curious as to why there is such a discrepancy.
I have attached my Oura, Bevel, Whoop, Athlytic, and Apple Health data for the last week.
Thanks
Canny AI
Merged in a post:
HRV data
Michele Genevieve Jarvis
My Apple Watch is tracking HRV as average of 28 overnight but bevel says 18.6!!!
My coros watch (which bevel is not using) says it was 26 overnight.
I think somethings up
Michele Genevieve Jarvis
Thanks Grey appreciate it.
Michele Genevieve Jarvis
Just Apple Watch writing data.
Michele Genevieve Jarvis
Thanks
Grey
Michele Genevieve Jarvis: I'm jumping in for Randell here.
The value you see in Apple Health is calculated using the SDNN method, whereas Bevel will default to using RMSSD to calculate your HRV. Inherently, these are different methods and will yield different numbers.
I would not worry about the absolute numbers and focus more on the trends. Generally, the RMSSD method is considered to be more accurate for Recovery tracking. I recommend sticking to it unless you specifically want the SDNN method.
Here is a post that explains the differences between different methods: https://tryterra.co/blog/measuring-hrv-sdnn-and-rmssd-3a9b962f7314
Let me know if you have any other questions.
Randell
Hi Michele Genevieve Jarvis, I'd like to follow up on this
Daniel Simple
Okay, I’ve just seen that there’s two methods of HRV. Apple Health and Bevel. If I select Apple Health, it works perfectly as the other ones, but that made me doubt why is different and which one is better. Thanks for the help!
This is from the same day but HRV from Apple Health.
Grey
Daniel Simple: Apple Health's method is SDNN, which is why you're seeing a difference.
Generally, we recommend people stick with Bevel's method, as it is RMSSD and more accurate regarding Recovery analysis.
A difference within the single digit is expected as different hardware and algorithms will calculate slightly different values.
That said, we're investigating a small minority of users (like the OP here) who're getting wildly different values. Our current hypothesis is that the device is getting extreme outliers that are being caught by our current filters.
Daniel Simple
Grey Got it. I have Afib active so I have much more readings. I checked with a friend that also calculates on HRV with Apple Health and gets values much more similar to Oura and Whoop (usually 2-5 max difference). Oura, Whoop and my friend all use RMSSD, so it’s weird for me that Bevel one is off if it’s also using RMSSD. I will be mantaining Bevel calculation as I trust you do your job the best, and if an improvement is made will be on that one, but would be great to check it out. I can provide numbers daily as right now I’m using all of them if you need. Thanks!
Grey
Daniel Simple: We have an improvement in Beta right now. It would be great if you can help us test.
If you're interested, can you email me your iCloud email address and WhatsApp number at grey@bevel.health?
Elias Malek
Grey would I be able to help out with this as well? I’d love to provide feedback where possible.
Grey
Elias Malek: Yes definitely. Can you email me at grey@bevel.health?
Daniel Simple
I’m in the same position and thinking the same. I really want to replace my whoop and oura for Bevel. I attach my HRV of the same night. In my case HRV on Bevel usually it’s lower by 5-10.
Grey
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