Figure 3.

Day–Night comparison of cross sections of multifractal multiscale DFA coefficients. (a) Cross sections of α(q,τ) of IBI for scales τ between 8 and 2048 s and moment orders q between −5 and +5: average over the group of 14 participants in the Day subperiod; q < 0 in red, q > 0 in blue, q = 0 in black; the dotted line is α for q = 2 (second order moment of the monofractal DFA); (b) α(q,τ) of IBI as in panel (a) for the Night subperiod; (c) color map representing the statistical significance (p value) of the Day vs. Night comparison of IBI scale coefficients calculated at each τ and q after the Wilcoxon signed rank test; (d) α(q, τ) of SBP in the Day subperiod represented as in panel (a); (e) α(q, τ) of SBP in the Night subperiod represented as in panel (a); (f) color map of the Day vs. Night statistical significance for SBP scale coefficients; (g) α(q, τ) of DBP during Day represented as in panel (a); (h) α(q, τ) of DBP during Night represented as in panel (a); (i) color map of the Day vs. Night statistical significance for DBP coefficients.