Table 3—

Relationship between baseline variables and change in outcomes

Age yrs−0.1−0.00.2
BMI kg·m−20.2−0.2−0.1
Smoking pack-yrs−
6MWD % pred−0.3#−0.1−0.4
Quadriceps maximum torque Nms−0.2−0.1−0.2
Quadriceps Nms·kg−1×100−0.4−0.1−0.1
SGRQ total0.2−0.1−0.0
FEV1 % pred−0.0−0.4−0.1
FVC % pred−0.1−0.30.0
MIP % pred0.1−0.2−0.2
MEP % pred−0.1−0.2−0.1
V′O2,max kg·L−1·min−1−0.10.0−0.2
Grip % pred0.0−0.00.0
Borg score pre-6MWD m0.20.10.1
Borg score post-6MWD m−
Sa,O2 pre-6MWD %−0.4−0.3−0.2
Sa,O2 post-6MWD %0.1−0.4−0.2
Heart rate pre-6MWD−0.4−0.10.1
Heart rate post-6MWD−
  • 6MWD: 6-minute walking distance; SGRQ: St George's Respiratory Questionnaire; BMI: body mass index; FEV1: forced expiratory volume in one second; % pred: per cent predicted; FVC: forced vital capacity; MIP: maximal inspiratory pressure; MEP: maximal expiratory pressure; VO2,max: maximum oxygen consumption; MVV/V′E: maximal voluntary ventilation/ventilation ratio; Sa,O2: arterial oxygen saturation; COPDSE: Chronic Obstructive Pulmonary Disease Self-Efficacy Scale; LCADL: London Chest Activity of Daily Living Scale. Borg pre-6MWD values were log transformed in order to achieve a normal distribution prior to analysis. #: p<0.05; : p≤0.01.