Device research record
Oura Ring Gen2
Signals and sensors
From the device record. Fields the source does not state are left out.
- Maker
- Oura
- Form factor
- Finger
- Series
- Gen2
- Family
- Oura Ring
- Signals recorded
- PPG, Temperature, Accelerometer
- Also called
- Oura Gen2, Oura Ring 2
What published studies show
Results quoted from 5 published validation studies, each against a clinical reference. A result applies to the model and protocol tested, not to every model the brand sells. From the wearable accuracy database (v1.0.0).
Heart rate at rest1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring (Gen2) | r = 0.90Pearson correlation | Actiheart (ECG + accelerometer) | n = 21, Free-living, up to 7 days | Henriksen et al. (2022)Independent |
| Oura Ring (Gen2) | 3%Mean absolute percentage error | Actiheart (ECG + accelerometer) | n = 21, Free-living, up to 7 days | Henriksen et al. (2022)Independent |
- Oura Ring (Gen2)r = 0.90
Pearson correlation · vs Actiheart (ECG + accelerometer) · n = 21, Free-living, up to 7 days
Henriksen et al. (2022) Independent
Mean absolute percentage error · vs Actiheart (ECG + accelerometer) · n = 21, Free-living, up to 7 days
Henriksen et al. (2022) Independent
Overnight heart rate1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring Gen2 | ICC 0.85Intraclass correlation | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
| Oura Ring Gen2 | 1.8 bpm (absolute bias)Mean absolute error | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
- Oura Ring Gen2ICC 0.85
Intraclass correlation · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
- Oura Ring Gen21.8 bpm (absolute bias)
Mean absolute error · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
HRV (RMSSD)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring Gen2 | ICC 0.63Intraclass correlation | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
| Oura Ring Gen2 | 18.9 ms (absolute bias)Mean absolute error (absolute bias) | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
- Oura Ring Gen2ICC 0.63
Intraclass correlation · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
- Oura Ring Gen218.9 ms (absolute bias)
Mean absolute error (absolute bias) · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
Sleep stages (4-stage)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring Gen2 | 61%Epoch-by-epoch agreement | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
| Oura Ring Gen2 | κ = 0.43Cohen's kappa | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
- Oura Ring Gen2κ = 0.43
Cohen's kappa · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
Sleep vs wake (2-stage)2 studies
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring (Gen2) | 0.88–0.89Epoch-by-epoch agreement | Polysomnography (PSG) | n = 53, Sleep laboratory, multiple nights, 3 sleep-opportunity conditions | Chee et al. (2021)Maker funded |
| Oura Ring Gen2 | 89%Epoch-by-epoch agreement | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
| Oura Ring Gen2 | κ = 0.51Cohen's kappa | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
- Oura Ring (Gen2)0.88–0.89
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Sleep laboratory, multiple nights, 3 sleep-opportunity conditions
Chee et al. (2021) Maker funded
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
- Oura Ring Gen2κ = 0.51
Cohen's kappa · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
Total sleep time2 studies
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring (Gen2) | −32.8 to −47.3 minMean bias (signed) | Polysomnography (PSG) | n = 53, Sleep laboratory, multiple nights, 3 sleep-opportunity conditions | Chee et al. (2021)Maker funded |
| Oura Ring (Gen2) | r = 0.86Pearson correlation | Research actigraphy | n = 45, Home, 7 days | Asgari Mehrabadi et al. (2020)Independent |
- Oura Ring (Gen2)−32.8 to −47.3 min
Mean bias (signed) · vs Polysomnography (PSG) · n = 53, Sleep laboratory, multiple nights, 3 sleep-opportunity conditions
Chee et al. (2021) Maker funded
- Oura Ring (Gen2)r = 0.86
Pearson correlation · vs Research actigraphy · n = 45, Home, 7 days
Asgari Mehrabadi et al. (2020) Independent
Energy expenditure (calories)2 studies
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring (Gen2)total energy expenditure | r = 0.70Pearson correlation | Actiheart / ActiGraph | n = 21, Free-living, up to 7 days | Henriksen et al. (2022)Independent |
| Oura Ring (Gen2) | r = 0.93 (lab)Pearson correlation | Indirect calorimetry | Laboratory activities | Kristiansson et al. (2023)Independent |
- Oura Ring (Gen2)r = 0.70
Pearson correlation, total energy expenditure · vs Actiheart / ActiGraph · n = 21, Free-living, up to 7 days
Henriksen et al. (2022) Independent
- Oura Ring (Gen2)r = 0.93 (lab)
Pearson correlation · vs Indirect calorimetry · Laboratory activities
Kristiansson et al. (2023) Independent
Comparisons
Head-to-head pages that name Oura Ring Gen2 come first, then other comparisons for the brand.