Results have been published from a study by the University of Oulu comparing Oura’s heart rate variability data (HRV) against the state-of-the-art method in the field—electrocardiogram (ECG) HRV.

The study examined the accuracy of heart rate and beat-to-beat HRV measures of the Oura Ring. To ensure reliable measurements, researchers doubled down by having participants wear a ring on each hand.

Findings show Oura’s near-perfect alignment with ECG heart rate readings and demonstrates promise for using nighttime HRV as a tool for managing training loads among athletes.

Oura was found to have:

  • 99.9% reliability compared to medical-grade ECG for Resting Heart Rate.
  • 98.4% reliability compared to medical-grade ECG for Heart Rate Variability.

Read The Study