Abstract
This investigation presents the variations of photoplethysmogram (PPG) morphology with age. PPG measurement is done noninvasively at the index finger in both right and left hands of erectile dysfunction (ED) subjects. Parameters derived from the analysis of PPG contour showed an association with age. The age is found to be an important factor that affecting the contour of PPG signals, which accelerates the disappearance of PPG dicrotic notch and PPG inflection point as well. Arterial compliance found to be decreased with age due to the fall of arterial elasticity. This study approaches the establishment of the usefulness of PPG contour analysis in investigating the changes in the elastic properties of the vascular system with age and the detection of early arteriosclerosis.