Arterial Stiffness & Vascular Aging
We often think about cardiovascular health in terms of cholesterol and blood pressure.
But another important question is:
How healthy and flexible are the arteries themselves?
Healthy arteries are elastic. They expand with each heartbeat and recoil as blood moves through the circulation.
As we age, arteries naturally become somewhat stiffer. High blood pressure, metabolic dysfunction, chronic kidney disease, smoking, inflammation, and other factors can accelerate this process.
Measuring arterial stiffness can provide another window into vascular health.
Why Do Arteries Need to Be Flexible?
Each time the heart contracts, it sends a pulse of blood into the arterial system. Large arteries such as the aorta expand to absorb some of that pressure.
Between heartbeats, they recoil and help maintain continuous blood flow.This elasticity reduces the amount of pulsatile pressure transmitted into smaller blood vessels.
When arteries become stiffer, they absorb less of that energy. The result can be greater stress on the heart and increased transmission of pulsatile pressure into organs such as the:
Brain
Kidneys
Heart
This is one reason arterial stiffness is relevant to cardiovascular aging.
What Causes Arterial Stiffness?
Some vascular stiffening occurs naturally with age, but the rate varies considerably.
Factors associated with greater arterial stiffness include:
Aging
High blood pressure
Insulin resistance and diabetes
Chronic kidney disease
Smoking
Increased visceral fat
Physical inactivity
Vascular calcification
Inflammation
Changes in collagen and elastin within the arterial wall
Genetics also contribute. The important point is that chronological age and vascular age are not necessarily the same thing. Two people of the same age can have very different arterial function.
What Is Pulse Wave Velocity?
When the heart beats, a pressure wave travels through the arteries. In more elastic arteries, that wave travels relatively slowly. In stiffer arteries, it moves faster.
Pulse wave velocity, or PWV, measures how quickly that pressure wave travels between two points.
Carotid-femoral pulse wave velocity is widely regarded as a reference method for assessing aortic arterial stiffness.
Arterial stiffness measured by PWV is associated with cardiovascular events and target-organ damage, particularly in people with hypertension.
The 2024 European hypertension guideline also recognizes arterial stiffness as a potential risk-refining test when treatment decisions remain uncertain.
What Is Central Blood Pressure?
The blood pressure measured at the arm is known as brachial blood pressure.
But the pressure experienced by the heart, brain, and major central arteries is not always identical to the pressure measured at the arm.
Central blood pressure estimates the pressure within the aorta and other large central vessels.
This can provide another perspective on how pressure waves are traveling through the arterial system.
Two people with similar arm blood pressure may have somewhat different central hemodynamics.
What Are Pulse-Wave Reflections?
When the pressure wave generated by the heartbeat reaches branches and smaller arteries, part of that wave is reflected back toward the heart.
In healthy, flexible arteries, the reflected wave generally returns later.
When arteries are stiffer, the wave travels faster and may return earlier.
This can increase central systolic pressure and the workload on the heart.
Measurements related to this phenomenon, including augmentation pressure or augmentation index, may be included in some vascular assessments.
These measurements are influenced by several factors, including age, heart rate, height, blood pressure, and vascular tone, so they are best interpreted as part of the broader cardiovascular picture.
Is Arterial Stiffness the Same as Atherosclerosis?
No.
They are related but different processes.
Atherosclerosis involves formation of plaque within the arterial wall.
Arterial stiffness describes changes in the mechanical properties of the arteries.
A person can have increased arterial stiffness without major obstructive plaque, and atherosclerosis can exist without severe generalized arterial stiffness.
Both may develop in response to some of the same risk factors, including hypertension, smoking, metabolic dysfunction, and aging.
This is why different cardiovascular tests can provide complementary information.
What About Endothelial Function?
The endothelium is the thin layer of cells lining the inside of blood vessels. It helps control vascular tone, blood clotting, inflammation, and communication between circulating blood and the vessel wall.
One of the molecules produced by healthy endothelial cells is nitric oxide, which helps blood vessels relax.
Endothelial dysfunction can occur early in the development of vascular disease.
This makes endothelial function another useful way to think about cardiovascular health before advanced structural disease develops.
Nitric Oxide and Vascular Function
Nitric oxide helps regulate:
Blood vessel dilation
Blood pressure
Blood flow
Platelet activity
Exercise-related changes in circulation
Nitric oxide production and availability may be affected by aging, smoking, metabolic dysfunction, oxidative stress, inactivity, and other cardiovascular stressors.
Several lifestyle and nutritional strategies can influence nitric-oxide biology.
These include:
Exercise
Vegetables naturally rich in dietary nitrate
Overall metabolic health
Blood pressure management
Smoking cessation
Selected nutritional and botanical compounds
This is an area where foundational strategies and targeted nutritional support can complement one another.
How Can Endothelial Function Be Measured?
Several techniques have been developed to evaluate vascular responses.
One noninvasive approach is peripheral arterial tonometry, used by systems such as EndoPAT. The test examines changes in blood flow after a temporary interruption of circulation in the arm. The resulting response provides information related to vascular reactivity and endothelial function.
As with any physiological test, the result is most useful when interpreted alongside blood pressure, lipids, metabolic markers, body composition, medical history, and other vascular assessments.
Why Measure Vascular Function Before Symptoms Develop?
A heart attack or stroke is a late clinical event. Vascular dysfunction begins much earlier.
Assessing endothelial function or arterial stiffness may help identify patterns of vascular aging before a person develops symptoms or advanced cardiovascular disease.
That creates an opportunity to ask:
Is blood pressure optimally controlled?
Is metabolic health contributing?
Is there significant visceral fat?
Is ApoB elevated?
Is physical activity adequate?
Are sleep or stress affecting vascular regulation?
Could nutrition or targeted supplementation better support vascular function?
Is additional imaging warranted?
The goal is to move from simply detecting disease toward understanding physiology earlier in the process.
Can Arterial Stiffness Improve?
Arterial stiffness is influenced by both long-term structural changes and shorter-term changes in vascular tone. This means not every component is equally reversible. However, several interventions have been associated with improvements in arterial function.
Blood Pressure Management
Chronically elevated blood pressure and arterial stiffness reinforce one another. Lowering excessive blood pressure can reduce stress on the arterial wall and may improve vascular function.
Exercise
Regular aerobic exercise can improve endothelial function and may reduce arterial stiffness.
Resistance training is also important for overall cardiometabolic health and healthy aging, although program design matters when blood pressure or vascular disease is present.
Metabolic Health
Insulin resistance, diabetes, and visceral adiposity are associated with vascular dysfunction. Improving metabolic health can therefore support the vascular system as well.
Nutrition
Dietary patterns emphasizing vegetables, fruits, legumes, nuts, seeds, fish, minimally processed foods, and appropriate healthy fats support cardiovascular health.
Dietary nitrate from foods such as leafy greens and beets can also influence nitric-oxide production and vascular tone.
Targeted Nutritional Support
Depending on the individual's physiology and laboratory findings, clinicians may consider nutrients or botanical compounds that support:
Nitric-oxide pathways
Endothelial function
Blood pressure
Lipid metabolism
Oxidative balance
Mitochondrial function
The goal is not to treat an arterial-stiffness number in isolation.
The goal is to understand why vascular function may be changing and address the relevant contributors.
How Does This Fit With Other Cardiovascular Testing?
Arterial stiffness is one part of a larger assessment. Different tools answer different questions.
Blood pressure tells us about pressure within the circulatory system.
ApoB provides information about atherogenic particle burden.
Lp(a) provides information about an important genetically influenced cardiovascular risk factor.
Coronary calcium or other imaging can show evidence of structural plaque.
Endothelial testing evaluates vascular reactivity.
Arterial stiffness testing examines the mechanical properties and pulse-wave behavior of the arteries.
These measurements overlap, but they are not interchangeable. The most useful assessment depends on the individual.
Vascular Aging at Crossroads
At Crossroads, vascular testing can be integrated with laboratory markers and other physiological assessments to provide a more complete picture of cardiovascular and healthy aging.
Depending on the patient, evaluation may include:
Blood pressure
24-hour ambulatory blood pressure
ApoB and Lp(a)
Metabolic markers
Body composition
Endothelial function testing such as EndoPAT
Arterial stiffness and pulse-wave measurements
Other cardiovascular assessments when appropriate
These results can establish a baseline, identify areas that deserve attention, and allow us to follow changes over time.
Intervention may include nutrition, exercise, sleep and stress support, targeted nutritional supplementation, medication, or other physician-guided strategies based on the individual's overall cardiovascular profile.
The goal is not simply to know your chronological age.
It is to better understand how your vascular system is aging and where there may be opportunities to improve function and reduce long-term risk.
Related Reading
Heart & Vascular Health
Return to our overview of cardiovascular health and prevention.
Understanding Cholesterol, ApoB & Lp(a)
Learn how atherogenic particle burden and genetically influenced Lp(a) contribute to cardiovascular risk.
24-Hour Blood Pressure Monitoring
Learn how blood pressure patterns during both waking and sleep can reveal information that office measurements may miss.