Figure 3
From: Synthetic photoplethysmogram generation using two Gaussian functions
Comparison of HRV between the real PPG and the synthetic PPG over 5-min duration in 116 subjects. (a), (c), (e), (g), (i) and (k) are Normalized Bland-Altman Plots of SDNN, RMSSD, LF, HF, SD1 and SD2, respectively. \(Average = (simulate' + real')/2\) and \(difference = real' - simulate'\) where \(real'\) and \(simulate'\) are the normalized values of HRV parameters for real PPG and synthetic PPG signals. The equation of normalization is \(X' = (X -\)mean of \(X)\)\(/\)standard deviation of \(X\), where \(X\) stands for the HRV parameters. (b), (d), (f), (h), (j) and (l) are correlations of SDNN, RMSSD, LF, HF, SD1 and SD2, respectively. r is the correlation coefficient. p is the p value. ms = milliseconds. This figure shows that the model can obtain a synthetic PPG with a similar HRV to a real PPG by given the same mean heart rate and standard deviation of beat-to-beat intervals.
