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. 2019 Jul 23;9:10666. doi: 10.1038/s41598-019-46936-9

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© The Author(s) 2019

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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Changes in blood pressure (BP), scale pulse transit time (PTT) based on green photoplethysmogram (PPG), wrist PTT based on green PPG, pulse arrival time (PAT) based on green PPG, and pre-ejection period (PEP) in response to BP-perturbing interventions (mean +/− SE). SP: systolic BP. DP: diastolic BP. PTT_S1: PTT calculated as time interval between H_S wave and PPG foot. PTT_S2: PTT calculated as time interval between I_S wave and PPG foot. PTT_W1: PTT calculated as time interval between I_W wave and PPG foot. PTT_W2: PTT calculated as time interval between J_W wave and PPG foot.