Association between ETc and LVET@60.

<p>Simple linear regression analysis of ejection time compensated (ETc) measured by photoplethysmography, and left ventricular ejection time adjusted to a heart rate of 60 bpm (LVET@60) measured by tonometry (r 0.46). The solid line represents the regression line and the interrupted line the line of identity.</p

Agreement between ETc and LVET@60.

<p>Bland-Altman plot of left ventricular ejection time adjusted to a heart rate of 60 bpm (LVET@60) by tonometry and left ventricular ejection time compensated (ETc) by photoplethysmography, depicting the relationship of difference of measurements (Delta LVET@60 –ETc) and mean value of measurements.</p

Correlation between DPA variables and heart rate and body height, respectively, in 112 individuals.

<p>^a) Second order polynomial regression analysis, <i>p</i> = 0.044.</p><p>DPA@75 denotes adjustment of the variable to a heart rate of 75 bpm.</p

Measures of agreement and reliability between two repeated measurements of digital pulse analysis (DPA) variables in 112 individuals.

<p>ΔDPA, difference between measurements; CoR, coefficient of repeatability; ICC, intraclass correlation coefficient</p><p>^a) 95% lower limit of agreement (-1.96 × SD of ΔDPA).</p><p>^b) 95% upper limit of agreement (+1.96 × SD of ΔDPA).</p><p>^c) After exclusion of three outliers with ΔDPA values ≥ ± 4SD of mean ΔDPA (old age in two, low heart rate in two, and low pulse height in one).</p><p>For explanation of DPA variables, see text.</p

Digital photoplethysmograms and acceleration photoplethysmograms.

<p>Authentic digital photoplethysmograms (upper panels) of a 33-year old healthy woman (left panel, heart rate 65 bpm, aging index -0.87) and a 66-year old healthy man (right panel, heart rate 61, aging index -0.09). S = starting point of systole; P = peak of percussion wave; T = tidal wave; C = incisura wave; D = dicrotic wave. Note the absence of a distinct incisura and dicrotic notch in the right plethysmogram, and differences in negative amplitudes of <i>b</i> and <i>d</i> peaks in the acceleration plethysmograms (lower panels).</p

Demographic characteristics of the study group.

<p>BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure</p><p>Demographic characteristics of the study group.</p