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Non-linear analysis of heart rate variability from Physionet’s Fantasia database. Parameters of the 95% Poincare’s ellipse of the data SD1 (A) and SD2 (B). Shannon’s entropy is shown in (C). For all graphics. Each point corresponds to data from a women (pink) or men (blue) subject, while vertical lines correspond to the mean ± the standard deviation for each group (women, men, young, and old). (Adapted from Lavin-Perez and Rivera, 2018).
