This was supposed to work before but for many people (myself included) it simply didn't work. Contacting Apple about it was pointless too, most Apple support weren't aware of the feature or even knew what HRV was.
Hoping that this has been stealth fixed or improved with Watch OS 5. You should be able to see the HRV reading in your Health App after using the Breathe App on your watch.
Hoping that this has been stealth fixed or improved with Watch OS 5. You should be able to see the HRV reading in your Health App after using the Breathe App on your watch.