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. 2023 Apr 28;13:6950. doi: 10.1038/s41598-023-32180-9

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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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Ergometry measurements: Results of (a) inspiratory CO₂ behind the mask (pCO₂in), (b) blood partial pressure of CO₂ (pCO₂); (c) blood partial pressure of O₂ (pO₂); (d) haemoglobin oxygen saturation (sO₂), (e) temperature behind the mask (Tmask), and (f) relative humidity behind the mask (RH) in 40 subjects wearing no mask (blue), surgical mask (yellow), community mask (green), and FFP2 (red). The load levels correspond to light work (pre and post), moderate (E1), heavy (E2) and very heavy work (E3). P-values are shown in Table 4.