Table 1 Baseline characteristics and number of subjects in each study evaluation
Evaluation 1 (subjects with COPD who had concurrent DP and AW measurements)Evaluation 2 (normal subjects of similar age who had AW measurement)Evaluation 3 (subjects with COPD who had AW measurement before and after PR)Evaluations 2 and 3 (subjects with COPD who had AW measurement)
No of subjects12182333
M:F9:38:1012:1117:16
Age (years)63 (7)70 (6)66 (9)67 (8)
Current:ex:never smokers3:9:05:9:45:18:07:26:0
FEV1 (l)1.01 (0.43)2.5 (0.6)0.93 (0.32)0.96 (0.4)
FEV1 (%)33.4 (12.2)105.1 (17.7)36.4 (11.6)38.2 (12)
FVC (l)2.83 (0.93)3.3 (0.8)2.27 (0.46)2.36 (0.9)
FEV1/FVC0.36 (0.07)0.77 (0.04)0.41 (0.13)0.42 (0.12)
IC%73.3 (14.5)NK71.6 (15.8)77.6 (20.8)
Quadriceps MVC (N)NK415 (98)315 (106)308 (116)
SGRQ Total63.4 (16.2)NK62.1 (13)62.2 (12.5)
SGRQ Activity77.2 (19.4)NK79.1 (13.1)80.1 (13.7)
NEADL18.9 (2.3)NK16.4 (2.7)15.7 (2.8)
Actiwatch measures:
Mean activity (×103 counts/h)123 (110)143 (61)82 (53)82 (49)
Mean intensity of activity (×103 counts/h)190 (162)232 (90)156 (69)156 (63)
% of time mobile63.2 (14.5)61.4 (11.2)50 (13.9)50.8 (15.4)
  • Data presented as mean (SD).

  • AW, measurement of leg activity using the Actiwatch accelerometer; COPD, chronic obstructive pulmonary disease; DP, measurement of whole body activity using the Dynaport activity monitor; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; IC, inspiratory capacity; MVC, maximum voluntary contraction; NEADL, Nottingham Extended Activities of Daily Living Questionnaire; NK, not known (not recorded in the particular group); PR, pulmonary rehabilitation; SGRQ, St George’s Respiratory Questionnaire.