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. 2021 Dec 8;11:23602. doi: 10.1038/s41598-021-03069-2

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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The graphical description of the experiment environment. HR and RR were measured simultaneously using an IR-UWB radar sensor and a patient monitor in both supine (A) and sitting (B) positions. ECG and capnometry was obtained using the patient monitor to determine the reference values of HR and RR respectively. ECG and the capnometry setup is described in (C). The measurements of HR and RR were conducted for 2 min in each posture. The radar sensor was placed on a tripod at a 1.5 m distance, in the sitting position, and suspended at 1.5 m above in the supine position, directing to the anterior chest wall.