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Fig. 2 | Journal of Physiological Anthropology

Fig. 2

From: Assessment of autonomic function by long-term heart rate variability: beyond the classical framework of LF and HF measurements

Fig. 2

Analysis of non-Gaussian heart rate fluctuations in two representative post-MI patients: survivor (A) and cardiac death (B). From the top, trend graphs of normal-to-normal R-R interval b(t), standardized time series of heart rate increments Δ25sB(t), and standardized probability density functions (PDFs) of heart rate increments P25sB(t)) with non-Gaussianity index of λ25s. In the middle- and bottom-row panels, gray-shaded areas cover ± 3 SD ranges. In the bottom-row panels, solid lines indicate the PDF approximated for the corresponding λ25s values by a non-Gaussian model [27]. Compared to the survivor, bursty changes with amplitudes exceeding ±3 SD (gray-shaded areas in the middle-row panels) increase in the cardiac death patient, resulting in a sharper peak with fatter tails in the PDF (bottom-row panels) and a larger value of λ25s, which reflects the degree of deviation from the Gaussian distribution (dashed lines in the bottom-row panels). Modified Fig. 1 of reference [30]

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