{"id":1004532,"date":"2026-06-16T22:00:38","date_gmt":"2026-06-16T22:00:38","guid":{"rendered":"https:\/\/ouraring.wpengine.com\/?p=1004532"},"modified":"2026-06-22T17:04:06","modified_gmt":"2026-06-22T17:04:06","slug":"what-ppg-can-reveal-new-cardiovascular-and-respiratory-research-findings","status":"publish","type":"post","link":"https:\/\/ouraring.wpengine.com\/zh_TX\/what-ppg-can-reveal-new-cardiovascular-and-respiratory-research-findings\/","title":{"rendered":"What PPG Can Reveal: New Cardiovascular and Respiratory Research Findings"},"content":{"rendered":"

We believe that <\/span>the finger<\/span><\/a> is one of the most information-rich surfaces on the human body. The photoplethysmography (PPG) sensor inside every <\/span>Oura Ring<\/span><\/a> continuously captures the arterial pulse wave as it travels through the finger, and hidden within that signal is a remarkably detailed picture of cardiovascular and respiratory health.<\/span><\/p>\n

We have been investing heavily in what that signal can tell us. We are excited to share some of our recent health science findings.\u00a0<\/span><\/p>\n

What Is PPG?\u00a0<\/b><\/h3>\n

Photoplethysmography (PPG)<\/span><\/a> measures the volumetric changes in the arteries using light reflection.\u00a0<\/span><\/p>\n

The PPG signal is an optical measurement of the arterial pulse wave \u2014 i.e. the wave generated when blood is ejected from the heart during systole, temporarily increasing arterial pressure and causing vessel expansion and contraction. PPG works by shining a light on the finger and capturing the changes in light reflected back from the vascular bed or capillaries.\u00a0<\/span><\/p>\n

Research has shown<\/span><\/a> that this signal contains a wealth of information on the heart, blood vessels, breathing, and autonomic nervous system.\u00a0<\/span><\/p>\n

Our latest PPG research spans three interconnected areas: patterns associated with hypertension, how blood pressure behaves during sleep, and breathing disturbances through the night.<\/span><\/p>\n

PPG Patterns Associated with Hypertension<\/b><\/h3>\n

Background<\/b><\/p>\n

High blood pressure (hypertension) is a primary driver of cardiovascular disease, yet it is often <\/span>undetected or undertreated<\/span><\/a>. However, \u201cwhite coat hypertension,\u201d when patients have elevated blood pressure measurements during a medical appointment but not outside of the clinical environment, occurs in <\/span>15-30%<\/span><\/a> of people, and can lead to incorrect identification of high blood pressure. Our research explored whether nightly PPG data from the Oura Ring could identify physiological patterns associated with high blood pressure without a cuff. This could improve screening for hypertension at a population health level.\u00a0<\/span><\/p>\n

Research<\/b><\/p>\n

An algorithm was developed using data from Oura’s <\/span>Blood Pressure Profile Study<\/span><\/a>, which as of June 2026, has enrolled more than 300,000 consenting members who contributed Oura Ring data alongside self-reported hypertension status, self-reported health information, and cuff-based blood pressure measurements.\u00a0<\/span><\/p>\n

In testing, the algorithm demonstrated 62% sensitivity for detecting hypertension (1)<\/span>, which means that 62% of people who reported hypertension were correctly identified. The algorithm also demonstrated 91% specificity, meaning that the algorithm correctly classified 91% of individuals without known hypertension at the time of the study (2)<\/span>.\u00a0<\/span><\/p>\n\n\n\n

\n<\/span>About Sensitivity and Specificity<\/b><\/a>:\u00a0<\/b>Sensitivity<\/b> and <\/span>specificity <\/b>are two key metrics used to evaluate the performance of a health screening test.\u00a0<\/span><\/p>\n