HRV is Oura's core readiness signal, and finger-based sensing captures more accurate HRV readings than wrist wearables because the finger has less motion artifact.
Sources reporting this (5)
Oura unveils AI-enabled Ring 5 with predictive health featuresMobiHealthNews · May 28, 2026
Oura Ring 5 hands-on review: I’ve worn the world’s smallest smart ring for a week, and it changes fitness tracking foreverTom's Guide · Jun 4, 2026
Oura Ring 5 Unveiled With Smaller Design and Blood Pressure TrackingMacRumors · May 28, 2026
The Oura Ring 5 is the ultra-smart wearable you won’t know you’re wearing9to5Mac · Jun 19, 2026
Thinner Oura Ring 5 finally tracks live activity, $50 price increase9to5Google · May 28, 2026