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. 2018 May 18;9:546. doi: 10.3389/fphys.2018.00546

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Copyright © 2018 Ahammer, Scheruebel, Arnold, Mayrhofer-Reinhartshuber, Lang, Dolgos, Pelzmann and Zorn-Pauly.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Sample entropy SampEn (left column) and Higuchi dimension D_H (right column) of beat to beat intervals BBIs determined optically and electrically. (A) Net plots showing 13 SampEn and D_H values for BBIs. (B) Box plots of these 13 experiments, p-values with df = 12, median test. (C) Scatterplots of these 13 experiments. Dashed lines represent theoretical correlations with the slope of one.