HRV is regularly off by 50+ when compared to Oura and Whoop.
complete
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
Grey
complete
Grey
in progress
Grey
under review
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.
Elias Malek
Grey Randell
Any thoughts on this? Sorry to @ you, just haven’t received any info on this
Grey
Elias Malek: Hi Elias, sorry for the delay. We were tied up with the new release earlier this week.
Can you go to Bevel Settings > Customization > Calculations > Screenshot this view for me?
Elias Malek
Grey no worries!