10/10/2026
🫀Ever wondered what your Oura ring or Apple Watch is actually measuring when it shows "HRV"?
Heart Rate Variability (HRV) is the variation in time between each heartbeat - not your heart rate itself. A heart that beats perfectly evenly, like a metronome, generally reflects less adaptability, not more.
Higher HRV is generally associated with a nervous system that can shift more easily between "go" mode (sympathetic) and "rest" mode (parasympathetic). Lower HRV is often seen alongside chronic stress, poor recovery, and reduced adaptability.
A higher variability means that your nervous system is able to modulate and shift between states of arousal and calm more efficiently, leading to greater resilience in the face of stress, and better recovery in the down time.
It's one of the most researched, non-invasive ways to get a window into how your nervous system is functioning day to day - and wearables like Oura, Whoop and Apple Watch have made it easy to track at home.
We're not here to tell you a number defines your health, but context is helpful and HRV is a genuinely useful data point to know about.