Table 5.

Mean $\dot{V}$, HR, MAP and $P_{\mathrm{ETC}{\mathrm{O}}_2}$ values recorded during the 2 min baseline period in the PECO trials of the normocapnic and hypercapnic COPD patients

	$\dot{V}$ (l min−1)	f (breaths min−1)	HR (beats min−1)	MAP (mmHg)	$P_{\mathrm{ETC}{\mathrm{O}}_2}$ (mmHg)
Normocapnia	9.9 ± 0.9	14.6 ± 4.1	70 ± 1.6	92 ± 3.4	37 ± 1.7
Hypercapnia	10.8 ± 0.8	15.7 ± 3.6	74 ± 1.2	89 ± 1.6	51 ± 2.3*

^*Significant difference from normocapnia (P < 0.05).