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COVID-19 survivors may experience long-term health problems, including deterioration of cardiorespiratory fitness (CRF), as demonstrated by several cross-sectional studies that compared the results of cardiopulmonary exercise tests (CPET) performed only after COVID-19 with predicted values. This study aimed to analyze a change in CRF between repeated CPETs in response to suffered COVID-19. A total of 127 healthcare workers (HCWs; mean age 55.7 years) underwent two CPETs with a mean interval of 762 days. Forty HCWs suffered from COVID-19 (mild to moderate severity) in the interim (321 days before the second CPET), and 87 HCWs formed a control group. Mixed-effects regression with multiple adjustment and interaction terms was used for two response variables – maximum oxygen uptake (VO2 max) and power output. Between both CPETs, mean VO2 max decreased statistically significantly in the COVID-19 subgroup (by 3.12 mL/kg/min,  p  = .034) and insignificantly in controls (by 0.56 mL/kg/min,  p  = .412). The proportion of HCWs achieving predicted VO2 max decreased from 75.9% to 59.5% ( p  = .161) in COVID-19 survivors, while it increased from 73.8% to 81% ( p  = .274) in controls. COVID-19 ( β  = −0.66,  p  = .014) and body mass index ( β  = −0.49,  p  &lt; .001) were independent negative predictors of VO2 max change. COVID-19 was not associated with a change in power output. On the basis of repeated CPETs, COVID-19 significantly, albeit rather modestly, reduces CRF almost one year after infection. The reduction persists even after the acute phase with mild or moderate severity.

COVID-19 reduces cardiorespiratory fitness even months after a mild to moderate acute phase: a retrospective cohort study