Figure 4.

The changes of exercise variables before and after pulmonary rehabilitation.

Notes: In the time only increased group, the data for peak exercise in 18 patients and the data for AT, which were obtained at both pre- and post-PR, in 12 patients were used. In the two factors increased group, the data for peak exercise in 11 patients and the data for AT, which were obtained at both pre- and post-PR, in 10 patients were used. The post-PR results are compared with the pre-PR results within each group (^*P<0.05, ^**P<0.01, ^***P<0.001, ^****P<0.001) and between the two groups (^#P<0.05, ^##P<0.01, ^###P<0.001, ^####P<0.001) using paired t-tests and unpaired t-tests, respectively.

Abbreviations: AT, anaerobic threshold; ΔFO₂, the inspired oxygen concentration (FiO₂) minus expired oxygen concentration (FeO₂); peak ex., peak exercise; ${\dot{\mathrm{V}}\text{CO}}_2$, carbon dioxide output; ${\dot{\mathrm{V}}}_{\mathrm{E}}$, minute ventilation; ${\dot{\mathrm{V}}\mathrm{O}}_2$, oxygen uptake.