Determination of age-related increases in large artery stiffness by digital pulse contour analysis.

By S. Millasseau, R. P. Kelly, J. Ritter, P. Chowienczyk. Clinical science, 2002

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Clinical measurement of arterial stiffness obtained from noninvasive pressure waveforms. (2005, background): “2, bottom), and both can be used as estimates of arterial stiffness.(22,40) However, care must be taken when interpreting interindividual differences in the augmentation index or in using it as an index of arterial stiffness because of its dependence on both heart rate(41,42) and body height.”
Photoplethysmography and its application in clinical physiological measurement (2007, methodology): “Millasseau et al (2002) quantified the PPG finger pulse shape using the large artery Stiffness Index and the Reflection Index to give information representing arterial stiffness and vascular tone, respectively.”
Photoplethysmography revisited: from contact to noncontact, from point to imaging (2015, positive): “introduced an objective index (units m/s) to assess artery stiffness, which is calculated from the body height divided by the time delay between the systolic and diastolic peaks [160].”
The use of photoplethysmography for assessing hypertension (2019, background): “Several different types of PPG waveforms have been observed and found to correlate with age and cardiovascular pathology.(24,25) Since the volume and distension of the arteries can be related to the pressure in the arteries, the PPG signal produces pulse waveforms that are very similar to pressure w”