The artery wall is compliant and stretches in response to the traveling pressure pulse generated by the contracting heart. The dynamics of this motion are known to convey important information about the health of the artery and cardio-vascular system. For example, compliance, a measure of artery flexibility, decreases due to aging, as well as disease states such as hypertension and atherosclerosis. It also exhibits acute and chronic changes under pharmacological interventions.

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