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. 2017 Oct 13;7:13175. doi: 10.1038/s41598-017-13138-0

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© The Author(s) 2017

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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Diagram of 128 consecutive heartbeats in ECG (A) and BCG (B,C) recording with time dependent analysis by ECG R-wave peak detection at 0 ms in any diagram. For better amplitude visualization, the maxima and minima are visualized with colour gradients in an arbitrary scale; (A) The ECG shows a harmonic signal over the whole displayed time during sinus rhythm; (B) Sinus rhythm; genuine BCG signal deteriorates due to signal superposition of breathing and movement artefacts. (C) Sinus rhythm (filtering the BCG signal) exposes a typical mechanical amplitudes sequence of each heartbeat but also shows the ambiguous and intraindividually variable nature of mechanical heartbeat movement.