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Table 4 Incremental shuttle walking test: before and after CPAP treatment

From: Nocturnal CPAP improves walking capacity in COPD patients with obstructive sleep apnoea

Variable Overlap syndrome COPD  
n = 22 n = 22
Before After p Before After p P
  CPAP CPAP   CPAP CPAP   
Distance (metre) 226.4 ± 95.3 288.6 ± 94.6 0.001 257.5 ± 89.1 272.5 ± 98.4 0.035 0.001
Borg scale (pre-exercise) 1.5 ± 1.5 0.8 ± 1.1 0.040 1.4 ± 1.3 0.7 ± 1.1 0.064 0.832
Borg scale (post-exercise) 4.9 ± 0.9 4.8 ± 1.1 0.851 5.0 ± 1.1 4.7 ± 1.2 0.450 0.596
SaO2 (pre-exercise) 94.5 ± 2.2 95.5 ± 1.9 0.014 94.6 ± 2.7 95.3 ± 2.2 0.046 0.351
SaO2 (post-exercise) 88.8 ± 4.4 87.8 ± 6.3 0.827 85.1 ± 6.0 84.6 ± 5.7 0.717 0.972
Heart rate (pre-exercise) 94.3 ± 17.7 87.3 ± 15.8 0.009 93.2 ± 15.6 93.4 ± 16.1 0.999 0.026
Heart rate (post-exercise) 136.3 ± 24.2 125.0 ± 22.8 0.018 125.3 ± 29.3 134.8 ± 29.6 0.135 0.010
Delta-IC (L) −0.04 ± 0.23 −0.08 ± 0.17 0.489 −0.13 ± 0.21 −0.12 ± 0.24 0.979 0.548
IC pre-exercise (L) 1.37 ± 0.48 1.44 ± 0.48 0.184 1.34 ± 0.42 1.32 ± 0.42 0.687 0.171
IC post-exercise (L) 1.33 ± 0.48 1.36 ± 0.46 0.586 1.21 ± 0.42 1.20 ± 0.49 0.672 0.225
  1. P values represent comparisons between before and after CPAP in each corresponding group.
  2. P values represent comparisons with regards to the changes with CPAP treatment between overlap syndrome and pure COPD in each corresponding group.
  3. IC inspiratory capacity.