Internal Age: How It's Measured & What It Means

May 2, 2017 12:00:00 AM by Adam Sharp | pulse wave velocity, internal age, aortic stiffness, aortic pulse wave velocity

iHeart is a fingertip device and mobile app that determines a person’s Internal Age in 30 seconds. The purpose of this blog post is to simplify the science behind the readings, to give a better understanding of how this information is measured, and to explain exactly what is meant by ‘Internal Age’.

45 year old lady running in woods with graphic showing her internal age of 30.


iHeart analyzes Aortic Pulse Wave Velocity (AoPWV), the speed at which pressure waves pulse through the aorta. AoPWV is closely related to - and is a measure of - stiffness of the aorta and spinal column, and increased stiffness results in decreased mobility of the body’s core regions. As AoPWV increases in speed, mobility of the core is reduced and the internal organs receive less of a massaging action with each breath. This decreases organ circulation affecting their function, health and longevity.

In Relation to Internal Age

iHeart results screen with annotation describing Aortic Pulse Wave Velocity


Internal Age is determined by comparing iHeart's readings to those of the world’s ‘gold standard’ for AoPWV testing. By knowing the optimal measurement per age on this system, we can evaluate a person’s health against their actual age. This number is presented in the iHeart app as Internal Age. The graph below illustrates average healthy and unhealthy AoPWV vs. Age readings.

Graph of Aortic PWV vs. Age showing healthy, average and unhealthy values.

In its measurement of Aortic Stiffness, AoPWV can not only be used to assess risk of illness but also shows improvement with attention to diet, exercise and stress management. iHeart is a way to ‘look inside’ and can help people objectively appreciate the benefit of positive lifestyle choices, both in the short term to see what personally works for them, and in the long term as those choices are perpetuated and gradually affect overall internal health.LEARN MORE

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Author: Adam Sharp

Adam is the Community & Support Manager at VitalSines, Inc. He moved to Vancouver 8 years ago from Buckingham, England, after an extended period of travel throughout North America and Europe. This time provided a good opportunity to develop some social context, and a ten-year career in the entertainment industry offered the structure necessary to fulfill his current role at VitalSines. Adam’s hobbies include playing music, snowboarding, printmaking and cycling.

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