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Arterial Stiffness Index Calculator

Estimate arterial stiffness index (m/s) from height and pulse transit time.

Arterial Stiffness Index

Estimate pulse wave velocity surrogates using height and pulse transit time.

Understanding the Inputs

Review the measurements needed for this estimate

Height (cm): Standing height is used with pulse transit time to estimate pulse wave velocity.
Pulse transit time ΔT (ms): Delay between heart contraction and peripheral pulse arrival, measured in milliseconds.

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Complete Guide: Understanding Arterial Stiffness

Arterial stiffness reflects how compliant your vessels are when blood is pumped from the heart. Higher stiffness increases workload on the heart and relates to long-term cardiovascular risk. Manage blood pressure, improve cardiorespiratory fitness, reduce smoking and alcohol, and maintain a nutrient-rich diet to support healthier arteries.

Always confirm findings with medical professionals—this calculator is educational and should complement, not replace, clinical assessments.

Frequently Asked Questions

Detailed, SEO-oriented answers

What is the arterial stiffness index?

The arterial stiffness index (SI) is an estimate of arterial compliance calculated from pulse transit time divided into body height. Higher values may indicate stiffer arteries and higher cardiovascular risk.

How do I measure pulse transit time?

Pulse transit time is often captured by specialized blood pressure monitors, photoplethysmography devices, or research-grade wearables. It represents the delay between the pulse reaching peripheral sites.

What SI value is considered normal?

Values between roughly 5–9 m/s are common in healthy adults, but ranges vary by age, blood pressure, and measurement technique. Use this calculator for educational insights only.

Can I reduce arterial stiffness?

Yes. Lifestyle factors such as aerobic exercise, resistance training, blood pressure management, balanced nutrition, and stress reduction can improve vascular compliance over time.

Does age affect the stiffness index?

Arterial stiffness tends to increase with age due to structural changes in vessel walls. Tracking trends and managing risk factors becomes more important as you age.

How does blood pressure influence stiffness?

Chronic high blood pressure accelerates arterial stiffening by stressing vessel walls. Controlling blood pressure through diet, exercise, and medication reduces this effect.

What role does sodium play?

High sodium intake can elevate blood pressure and indirectly raise arterial stiffness. Moderating sodium while increasing potassium-rich foods supports vascular health.

Should I test SI at home?

Home measurements are only valid if you have calibrated equipment. Medical-grade assessments performed by healthcare professionals remain the gold standard.

How often should I reassess?

Re-check every few months or as recommended by your clinician, especially when adjusting treatment plans or lifestyle interventions.

Is SI a diagnostic tool?

No. SI is a screening metric. Elevated readings should prompt consultation with healthcare providers for comprehensive cardiovascular evaluation.

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Arterial Stiffness Index Calculator

Estimate arterial stiffness index (m/s) from height and pulse transit time.

How to use Arterial Stiffness Index Calculator

Step-by-step guide to using the Arterial Stiffness Index Calculator:

Enter your values. Input the required values in the calculator form
Calculate. The calculator will automatically compute and display your results
Review results. Review the calculated results and any additional information provided

Frequently asked questions

How do I use the Arterial Stiffness Index Calculator?

Simply enter your values in the input fields and the calculator will automatically compute the results. The Arterial Stiffness Index Calculator is designed to be user-friendly and provide instant calculations.

Is the Arterial Stiffness Index Calculator free to use?

Yes, the Arterial Stiffness Index Calculator is completely free to use. No registration or payment is required.

Can I use this calculator on mobile devices?

Yes, the Arterial Stiffness Index Calculator is fully responsive and works perfectly on mobile phones, tablets, and desktop computers.

Are the results from Arterial Stiffness Index Calculator accurate?

Yes, our calculators use standard formulas and are regularly tested for accuracy. However, results should be used for informational purposes and not as a substitute for professional advice.