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Figure 2 | BioMedical Engineering OnLine

Figure 2

From: Heart rate variability analysis using robust period detection

Figure 2

Log transformed LF/HF ratios for distorted IBI series plotted versus undistorted series. Power spectra were estimated by the RPD, FFT and LSP methods and log transformed LF/HF ratio calculated for 904 five minutes periods with a distortion rate between 0.5% and 1.5%. Regression for RPD: log(Y) = 0.996∙log(X) + 0.002, R2 = 0.998; regression for FFT: log(Y) = 0.755∙log(X)-0.364, R2 = 0.582; regression for LSP: log(Y) = 0.738∙log(X)-0.520, R2 = 0.603.

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