Fig. 2From: Pre-flight evaluation of adult patients with cystic fibrosis: a cross-sectional studyRelationships between arterial oxygen partial pressure (PaO2) during Hypoxia Altitude Simulation Test (HAST) and physiological variables during exercise; maximal oxygen uptake (a), ventilatory eqvivalent for carbon dioxide ratio (VE/VCO2) (b), pulse oximetry (SpO2) (c) and PaO2 (d)Back to article page