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. 2020 Oct 13;10:17153. doi: 10.1038/s41598-020-73604-0

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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 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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Representative results for PSD by DSCA (a–c) and ECG (d–f) in one subject, according to supine and head up tilt postures. (a) Detrended and normalized BFI from sectioned BFI in channel 4. (b) PSD analysis in channel 4. (c) PSD pie analysis among three frequency bands in channel 4. (d) HRV (R–R interval) from ECG signal. (e) Relative PSD analysis from HRV. (f) PSD pie analysis from HRV.