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. 2020 Feb 26;10:3466. doi: 10.1038/s41598-020-60317-7

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Experimental setup. Participant lying down with two transmission pulse oximeters on each hand and one reflectance PPG sensor on the neck. ECG signals were simultaneously recorded using a portable polysomnography system (SOMNOmedics). The vein imaging camera was placed 30 cm on top of the participant’s neck to visualize the neck vasculature. Online vein imaging, neck JVP-PPG signals and ground truth finger PPG, were observable in real-time on the screen of the computer. ECG and PPG signals acquired in parallel with the polysomnography system were synchronized and processed after the data acquisition session was finished.