Table 1: Descriptive data (all values mean ± standard deviation unless otherwise indicated) of the study population undergoing CPET including anthropometrics, spirometry and CPET measurements. BMI-body mass index, VO2-peak oxygen consumption (ml/kg/min), FEV1%-Percent predicted Forced expiratory volume in first second, FVC%-Percent predicted Forced Vital Capacity, FEF25-75%-Percent predicted Forced midexpiratory flow, PEF%-Percent predicted Peak expiratory flow, VE/VCO2- minute ventilation/carbon dioxide production.

ALL N = 345 Ventilatory reserve ≤ 15% N = 76 Ventilatory reserve ≤ 15% & VO2 < 20 ml/kg/min N = 52
Female n (%) 147 (42.6%) 27 (35.5%) 26 (50.0%)
Age 59.2 ± 15.7 62.3 ± 12.8 65.0 ± 11.2
BMI (kg/m2) 29.3 ± 10.2 28.4 ± 5.7 29.0 ± 6.2
VO2 (ml/kg/min) 18.7 ± 7.1 19.7 ± 8.2 15.3 ± 3.0
Breathing reserve% 30.3 ± 19.7 1.5 ± 12.2 0.9 ± 13.3
FEV1% 78.5 ± 21.7 59.1 ± 21.1 51.1 ± 18.1
FVC% 86.9 ± 18.3 76.2 ± 20.9 69.6 ± 18.3
FEF25-75% 68.6 ± 38.5 38.4 ± 28 30.3 ± 24.5
PEF% 85.5 ± 23.6 72.3 ± 28.3 64.1 ± 27.4
VE/VCO2 32.4 ± 6.3 33.5 ± 5.9 34.8 ± 5.2