Distensibility is a metric of the stiffness of blood vessels. It is defined as


where and are the diameter of the vessel in systole and diastole, and and are the systolic and diastolic blood pressure.[1]


  1. Roccabianca, S.; Figueroa, C. A.; Tellides, G.; Humphrey, J. D. (2014-01-01). "Quantification of regional differences in aortic stiffness in the aging human". Journal of the Mechanical Behavior of Biomedical Materials. 29: 618–634. doi:10.1016/j.jmbbm.2013.01.026. ISSN 1751-6161. PMC 3842391. PMID 23499251.
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