How does the Oura Ring track and measure stress levels?

The Oura Ring tracks and measures stress levels by monitoring a range of physiological signals, primarily focusing on heart rate variability (HRV), resting heart rate, and body temperature. Heart rate variability is the variation in time between each heartbeat, which is sensitive to stress; a higher HRV typically indicates lower stress levels and a more relaxed state. By collecting data on HRV, along with resting heart rate—which tends to increase when a person is stressed—and subtle changes in body temperature that can be stress-related, the Oura Ring provides insights into the wearer's stress levels. It uses these combined metrics to assess the user's autonomic nervous system state, offering feedback on recovery and readiness which indirectly reflects stress. Through an accompanying app, users receive personalized recommendations and can track how their lifestyle choices affect their overall stress and well-being.