Table 2– Cardiopulmonary parameters at rest and during the 6-min walk test (6MWT)
Subjects n444
FEV1 L2.78±0.74
FEV1 % pred100±14
FVC % pred102±14
Sp,O2 % pred at rest96.5±1.7
Sp,O2 % pred post-6MWT95.8±2.4#
Respiratory rate at rest breaths·min−116±2
HR at rest beats·min−176±10
HRmax/HRmax % pred73±13
End Borg dyspnoea score0.5 (0–3)
Borg dyspnoea score after 6MWT ≥144
6MWD m
 1st test554±89
 2nd test565±90
  • Data are presented as mean±sd, median (5th–95th percentiles) or %, unless otherwise stated. FEV1: forced expiratory volume in 1 s; % pred: % predicted; FVC: forced vital capacity; Sp,O2: arterial oxygen saturaiton measured by pulse oximetry; HR: heart rate; HRmax: maximal HR; 6MWD: 6-min walk distance. #: Sp,O2 decreased during the test (0.7%; p<0.001); : the walked distance during the second test was longer than the for first test (12 m; p<0.001).