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There is increasing evidence that patients who were infected with SARS-CoV-2 may experience adverse health outcomes months after the acute infection has resolved including reduction in aerobic capacity and fatigue. In this study, we compared aerobic capacity and exercise performance of 28 unvaccinated participants to 15 vaccinated ones who performed a symptom limited cardio-pulmonary exercise test (CPET) after acute COVID-19. We identified a significant difference in aerobic capacity between vaccinated and unvaccinated individuals, with a lower V'O2 peak percentage of predicted in the unvaccinated group. In addition, the unvaccinated group had a reduction in the peak-exercise heart rate and lower ventilation values. Our results suggest objective limitations to exercise capacity in the months following acute COVID19 illness, mitigated by vaccination

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