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. 2017 Mar 14;7:172. doi: 10.1038/s41598-017-00293-7

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Breathing signal measured by respiration belt (top) and ACMs (down) during breath hold task. As can be seen breathing signal can be easily tracked also with ACMs placed on chest and neck. ACM placed on chest is more sensitive and corresponds better to respiration belt. In the ACM signal, corresponding breathing signal was processed by using a 0.5 Hz low pass filter¹⁶. Breath hold task was carried out between 30–60 s and 110–140 s.