evidence: The effects of wearing facemasks on oxygenation and ventilation at rest and during physical activity - PMID: 33626065 - PMCID: PMC7904135 - DOI: 10.1371/journal.pone.0247414 The effects of wearing facemasks on oxygenation and ventilation at rest and during physical activity [...] Capillary carbon dioxide tension increases in hospital staff wearing filtering facepiece masks: a prospective crossover study.ERJ Open Res. 2023 Jul 3;9(4):00186-2023. doi: 10.1183/23120541.00186-2023. eCollection 2023 Jul. ERJ Open Res. 2023. PMID: 37404843 Free PMC article.