PWV, Arterial Elasticity, and Cardiovascular Age (CVA)
You know how old you are — but do you know how old your heart is?
Cardiovascular Age (CVA) estimates how your heart and blood vessels are aging compared to your chronological age. When combined with other health data from Oura Ring, CVA provides a more complete and long-term picture of your cardiovascular health.*
No matter your actual age, it is possible to improve heart health through healthy habits and lifestyle changes. In this article, you’ll learn what cardiovascular age means, why it matters, and how Pulse Wave Velocity (PWV) — a scientifically validated biometric measured by Oura Ring — plays a central role.
What Is Arterial Elasticity?
Oura Ring uses infrared photoplethysmography (PPG) sensors to estimate Pulse Wave Velocity (PWV) — the speed at which the pressure wave from each heartbeat travels through your arteries.
PWV is widely considered the gold standard measure of arterial stiffness, which naturally increases with age and is closely linked to biological aging.
Large arteries carry oxygen-rich blood from the heart to the rest of the body. When you’re young and healthy, these arteries are elastic and flexible, adapting easily to changes in blood flow.
As we age, arteries gradually lose elasticity — a process known as arterial stiffening. As arteries stiffen, PWV increases, meaning blood moves faster through the vessels.
Although aging is the main driver, research shows that lifestyle factors can accelerate arterial stiffening, including:
- Smoking
- Poor nutrition
- Inadequate sleep
- Physical inactivity
Medical conditions such as high blood pressure, elevated cholesterol, and obesity also contribute.
Why Is Arterial Elasticity Important?
“Think of your arteries as shock absorbers,” explains Pauli Oukainen, PhD, Senior Scientist at Oura.
Large arteries dampen the pressure waves generated by the heart. Smaller arteries — especially those supplying sensitive organs like the brain, kidneys, and heart itself — are not designed to handle high pressure.
As large arteries stiffen, they lose their cushioning function, exposing smaller vessels to excessive mechanical stress. Over time, this increases the risk of:
- Heart disease
- Stroke
- Heart failure
Reduced arterial elasticity has also been linked to kidney disease and Alzheimer’s disease.
PWV: The Overlooked Indicator of Heart Health
When people think about heart health, they usually focus on:
- Resting heart rate
- Heart rate variability (HRV)
- Blood pressure
- Cholesterol levels
Pulse Wave Velocity (PWV) is less well known, but it is one of the most powerful indicators of long-term cardiovascular health.
“While cholesterol or blood pressure provide a snapshot of your current state, PWV reflects the cumulative impact of lifestyle factors over your entire life,” explains Oukainen.
PWV changes slowly over time, making it a long-term, modifiable marker of heart health — regardless of age.
That said, short-term stressors can temporarily increase PWV, including:
- Acute illness
- Severe psychological stress
- Very cold temperatures
- Excessive salt intake (for some individuals)
How Does Oura Measure PWV?
Oura Ring enables non-invasive measurement of arterial elasticity using the same Gen3 hardware already built into the ring.
Its infrared PPG sensors emit light into the skin. As the pulse wave passes through the arteries, subtle changes in blood volume alter light absorption. These variations are detected by photodetectors, producing a PPG waveform that reflects blood flow dynamics.
From this signal, Oura calculates PWV with high precision.
From PPG Signals to Cardiovascular Age
Oura’s cardiovascular age algorithm is based on anonymized data from hundreds of thousands of members, combined with clinical research.
“Our research team analyzed massive amounts of PPG data and found that certain waveform characteristics correlate strongly with age — but with significant variability,” says Oukainen.
To understand this variability, Oura conducted clinical studies with 600 participants in collaboration with institutions such as:
- Kuopio Research Institute of Exercise Medicine (KuLTu)
- UCLA
The result: cardiovascular age is more closely related to arterial elasticity than chronological age.
By integrating population-level data with clinical findings, Oura developed an algorithm that provides two key metrics:
- Cardiovascular Age (CVA)
- Pulse Wave Velocity (PWV)
Together, these metrics help users understand and track their heart health more effectively.
Why Cardiovascular Age Matters
Your cardiovascular age offers valuable insight into the functional state of your cardiovascular system and your long-term health outlook.
A CVA that is lower than or aligned with your chronological age is a strong indicator of good cardiovascular health.
If your CVA is higher than expected, Oura provides personalized guidance — such as increasing physical activity or reducing sodium intake — to help improve it.
Regular PWV tracking allows for early detection of declining arterial elasticity, enabling proactive interventions that may reduce the risk of future cardiovascular events.
When combined with other Oura metrics — including resting heart rate, HRV, sleep patterns, and physical activity — CVA contributes to a comprehensive, long-term health profile.
Final Thought
Heart health is not static. It evolves gradually over time, shaped by aging, lifestyle, and underlying health conditions.
A proactive approach — grounded in data, awareness, and early action — empowers you to optimize your cardiovascular health and support a longer, healthier life.
Source: Oura
