Fig. 1From: Detection of dynamic lung hyperinflation using cardiopulmonary exercise testing and respiratory function in patients with stable cardiac disease: a multicenter, cross-sectional studyCorrelation between respiratory function and cardiopulmonary exercise testing (CPET) indices. The upper two panels show the relationship between FEV1.0/FVC and the Y-intercept of V̇E/V̇CO2 in the convex group (A-1) and the non-convex group (A-2). The lower two panels show the relationship between FEV1.0/FVC and the difference between the minimum V̇E/V̇CO2 and V̇E/V̇CO2 slopes in the convex (B-1) and non-convex groups (B-2). V̇E/V̇CO2: ventilatory equivalent for carbon dioxide production; FEV1.0/FVC: forced expiratory volume in 1 s as a percent of forced vital capacity;Back to article page