Table 2.
Hand grip strength, endurance, and 6MWT
| Dynamometric parameters | Controltotal (n=25) |
Controlmale (n=20) |
COPDtotal (n=58) |
COPDmale (n=43) |
|---|---|---|---|---|
| Max grip (N) | 371±90 | 395±82 | 316±88a | 342±80a |
| Max grip (N⋅kg−1) | 4.0 (3.6; 4.9) | 4.3 (3.6; 5.1) | 3.9 (3.6; 5.1) | 3.9 (3.3; 4.6) |
| Max grip (N⋅kg FFM−1) | 6.0±1.1 | 6.0±1.2 | 5.6±1.4 | 5.5±1.4 |
| Max grip (N⋅FVC−1) | 96 (87; 114) | 96 (87; 113) | 112 (96; 131)a | 112 (95; 140)a |
| Scored time (s) | 104 (88; 128) | 102 (80; 117) | 82 (67; 100)a | 81 (68; 97)a |
| AUC (thousands) | 18.9 (16.0; 24.2) | 19.1 (16.1; 24.3) | 13.6 (11.2; 16.1)a | 13.7 (11.7; 16.6)a |
| AUC/kg | 223 (198; 263) | 223 (196; 256) | 176 (134; 207)a | 166 (126; 201)a |
| AUC/kg FFM | 314 (276; 367) | 304 (270; 363) | 238 (182; 281)a | 230 (180; 259)a |
| AUC/FVC (thousands) | 4.7 (4.1; 5.6) | 4.6 (4.1; 5.3) | 4.9 (3.8; 6.0) | 4.9 (3.8; 5.6) |
| 6MWT (m) | 537 (484; 564) | 542 (487; 569) | 390 (345; 420)a | 420 (360; 450)a |
Notes: Results are expressed as mean ± SD or median (25th percentile; 75th percentile).
a
t-Test, Mann–Whitney U-test, or Wilcoxon signed rank test COPD vs control group (P≤0.05). Values of 6MWT for control group were calculated by using reference equations for healthy adults.14
Abbreviations: 6MWT, 6-minute walk test; AUC, area under the force/time curve; FFM, fat-free mass; FVC, forced vital capacity of lungs; Max grip, maximum hand grip strength of dominant arm; Scored time, elapsed time of endurance test in targeted range only.