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. 2023 May 19;13:8133. doi: 10.1038/s41598-023-34319-0

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© The Author(s) 2023

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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Heatmap of the correlation between physiological parameters (heart frequency (HF), percent from maximum HF, lactate) and perceived physical exertion (Borg scale) with selected items and the sum of the Comfort Score questionnaire. Data of 40 subjects across all levels of ergometry were considered. NM no mask, SM surgical mask, CM community mask, FFP2 filtering face piece class 2.