Fig. 1From: Peak oxygen uptake and breathing pattern in COPD patients – a four-year longitudinal studyThe relationship between change in V̇O2peak and change in FEV1 between the two cardiopulmonary exercise tests (CPET). V̇O2peak: Peak oxygen uptake. ΔV̇O2peak: V̇O2peak at CPET2 minus V̇O2peak at CPET1. FEV1: Forced expiratory volume in 1 sec. Δ FEV1: FEV1 at CPET2 minus FEV1 at CPET1. R2: The coefficient of determinationBack to article page