2.1. Participants
fever
Twenty consecutive COVID-19 participants, previously hospitalized at the University Hospital of Larissa, Greece (Flow chart. PFT, pulmonary functional test; VR, virtual reality system. Long-post-COVID-19 patient characteristics.Data are expressed as percent, mean ± standard deviation.DLCO(SB), single-breath diffusing capacity of the lung for CO; d-ROMs, determination of reactive oxygen metabolites' levels; F, female; FEVInclusion criteria were at least 2 months post discharge, without fever for a 48-h period, stable, without supplemental OPermission for the study was granted by the institution's ethics committee (approval number: 1829; October 13, 2021). The confidentiality of personal data was assured with Regulation (EU) 2016/679 (General Data Protection Regulation). The participants were informed orally of the procedure, provided written information, and signed the consent form. Additionally, they were encouraged to ask questions and receive complete and detailed answers.