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A-B, Graphs showing the components of the Fick principle in the patients who recovered from COVID-19 (A) and control participants (B) during maximum incremental invasive cardiopulmonary testing at rest, 25% of pVO2, 50% of pVO2, 75% of pVO2, and at pVO2. Data presented as mean ± SD. EO2 = systemic oxygen extraction; pVO2 = peak oxygen consumption; VO2 = oxygen consumption.
