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(A) 6MWD during the 6MWT in healthy subjects and COPD patients. (B) Delta SpO2 during the 6MWT in healthy subjects and COPD patients. (C) DPA in healthy subjects and COPD patients. (D) Delta SpO2 during DPA in healthy subjects and COPD patients. **P<0.01 between groups.
Abbreviations: 6MWD, 6 min walking distance; 6MWT, 6 min walking test; DPA, daily physical activity; HS, healthy subject; SpO2, saturation of pulse oxygenation.
