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. 2017 Oct 13;8:749. doi: 10.3389/fphys.2017.00749

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Copyright © 2017 Ticcinelli, Stankovski, Iatsenko, Bernjak, Bradbury, Gallagher, Clarkson, McClintock and Stefanovska.

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) or licensor 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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Figure A2 — Typical time series: (A) Skin blood flow measured by the LDF (also referred to as SBF); (B) RR interval (RRI); and (C) PPG signals from each group of subjects. PU stands for perfusion units, and AU for arbitrary units.