Feasible assessment of recovery and cardiovascular health: accuracy of nocturnal HR and HRV assessed via ring PPG in comparison to medical grade ECG
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OBJECTIVE: To validate the accuracy of the Oura ring in the quantification of resting heart rate (HR) and heart rate variability (HRV). BACKGROUND: Wearable devices have become comfortable, lightweight, and technologically advanced for assessing health behavior. As an example, the novel Oura ring integrates daily physical activity and nocturnal cardiovascular measurements. Ring users can follow their autonomic nervous system responses to their daily behavior based on nightly changes in HR and HRV, and adjust their behavior accordingly after self-reflection. As wearable photoplethysmogram (PPG) can be disrupted by several confounding influences, it is crucial to demonstrate the accuracy of ring measurements. APPROACH: Nocturnal HR and HRV were assessed in 49 adults with simultaneous measurements from the Oura ring and the gold standard ECG measurement. Female and male participants with a wide age range (15-72 years) and physical activity status were included. Regression analysis between ECG and the ring outcomes was performed. MAIN RESULTS: = 0.869 ± 0.098 and 0.765 ± 0.178 in HR and HRV, respectively). SIGNIFICANCE: Present findings indicate high validity of the Oura ring in the assessment of nocturnal HR and HRV in healthy adults. The results show the utility of this miniaturised device as a lifestyle management tool in long-term settings. High quality PPG signal results prompt future studies utilizing ring PPG towards clinically relevant health outcomes.
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The Oura Ring has been shown to have high agreement (r2 = 0.98) with ECG for measuring HRV.
“the device has been shown to have high agreement (r2 = 0.98) with ECG (the gold standard for measuring HRV) (48).”
From Predicting Symptoms of Depression and Anxiety Using Smartphone and Wearable Data (2021) · cites this paper as [48]
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- Authors
- Kinnunen, H., Rantanen, A., Kenttä, T., & Koskimäki, H.
- Affiliations
- University of Oulu (FI)
- Oulu University Hospital (FI)
- Corresponding author
- Kinnunen, Hannu
- Venue
- Physiological Measurement
- Publisher
- IOP Publishing
- Published
- 2020-04-01
- Volume
- 41
- Issue
- 4
- Pages
- 04NT01
- ISSN
- 0967-3334 (ISSN-L)
- 1361-6579
- OpenAlex
- W3013227193
- Cited by
- 184
- References
- 25
- Citations by year
- 2026: 26 · 2025: 36 · 2024: 35 · 2023: 29 · 2022: 25 · 2021: 27 · 2020: 6
- FWCI
- 6.83
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Physiological Measurement (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- Tauno Tönningin Säätiö (20190151)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › ECG Monitoring and Analysis
- Keywords
- Oura Ring, photoplethysmography, heart rate variability, resting heart rate, nocturnal heart rate, wearable devices, ECG validation, autonomic nervous system, cardiovascular health, recovery assessment, lifestyle management
- MeSH terms
- Adolescent, Adult, Aged, Electrocardiography, Feasibility Studies, Female, Heart Rate, Humans, Male, Middle Aged, Monitoring, Physiologic, Signal Processing, Computer-Assisted, Time Factors, Photoplethysmography, Recovery of Function, Young Adult
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