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. 2022 Feb 10;13:806163. doi: 10.3389/fpsyg.2022.806163

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Copyright © 2022 Michela, van Peer, Brammer, Nies, van Rooij, Oostenveld, Dorrestijn, Smit, Roelofs, Klumpers and Granic.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Evolution of the breathing biofeedback score and the HRV indexes. Changes across the whole training in panel (A) the average biofeedback score; (B) the high frequency component of HRV (0.15–0.4 Hz); (C) the coherence between the low frequency HRV and breathing; (D) the low frequency component of HRV (0.04–0.15 Hz). BFB ON, B phases, where online biofeedback was presented; Stderr, Standard Error; LF-breathing coherence, coherence between the low frequency component of HRV and breathing; LF HRF, low frequency HRV.