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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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Sum of Comfort and Symptom Score during ergometry (a), CPET (b) and workplace examination (c) in 40 subjects wearing no mask (blue), surgical mask (yellow), community mask (green), and FFP2 mask (red). P values are shown in Table 3. During ergometry and CPET, Comfort and Symptom Score were assessed before (pre) and after (post), and Comfort Score also within the last 20 s of each load level. The load levels correspond to light work (pre and post), moderate (E1), heavy (E2) and very heavy work (E3).