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Relative contributions of Complex I and Complex II-driven respiration and knee extensor endurance. A: ratio of State 3:CI to State 3:CII (i.e., CI/CII). B: relationship between CI/CII and knee extensor endurance. Note the significant relationship in the patients with COPD and lack of such a relationship in healthy controls. C: relationship between CI/CII and forced expiratory volume in 1 s (FEV1). *Significantly different from healthy controls.
