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. 2021 Dec 28;9(1):8. doi: 10.3390/bioengineering9010008

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Methodological workflow. (STV = Short Term Variability; SDev = Standard Deviation; PPA = peak-to-peak amplitude; VLF and %VLF = power and its percentage in the Very Low Frequency band; LF and %LF = power and its percentage in the Low Frequency band; HF and %HF = power and its percentage in the High Frequency band; SVB = Sympatho-Vagal Balance; SampEn = Sample Entropy; SD1 = Standard Deviation 1 perpendicular to the line-of-identity obtained by Poincaré maps; SD2 = Standard Deviation 2 along the line-of-identity obtained by Poincaré maps; HFD = Higouchi Fractal Dimension; VIRR = Variability Index obtained by applying the Symbolic Dynamics technique to the RR time series; VIFHR = Variability Index obtained by applying the Symbolic Dynamics technique to the FHRV signal).