Table 2.

Summary of Cardiopulmonary Exercise Test Endpoints in COPD and controls

	COPD (n = 11)	Controls (n = 11)
${\dot{\mathrm{V}}\mathrm{O}}_{2\mathrm{peak}}$
L·min-1	1.10 ± 0.34 *	1.52 ± 0.41
mL·min-1·kg-1	16.1 ± 4.6 *	22.6 ± 7.0
$\dot{\mathrm{V}}{\mathrm{O}}_{2\mathrm{peak}\mathrm{pred}},\%$	85 ± 29	106 ± 28
$\dot{\mathrm{V}}{\mathrm{CO}}_{2\mathrm{peak}},\mathrm{L}\cdot \mathrm{mi}{\mathrm{n}}^{‐1}$	1.08 ± 0.37 †	1.64 ± 0.50
${\dot{\mathrm{V}}}_{\mathrm{E}\mathrm{peak}},\mathrm{L}\cdot \mathrm{mi}{\mathrm{n}}^{‐1}$	40.7 ± 9.5 *	62.5 ± 21.1
${{\dot{\mathrm{V}}}_{\mathrm{E}}}_{\mathrm{peak}}/\mathrm{MVV},\%$	84 ± 16	71 ± 19
Bf, breaths·min-1	31 ± 5	35 ± 8
Sao2,%	89.5 ± 4.3 †	94.5 ± 2.0
Heart rate
HR peak, beats·min-1	121 ± 14 *	140 ± 20
HR age pred,%	81 ± 10	90 ± 13
O2 Pulse (mlbeat-1)	9.1 ± 2.7	10.8 ± 2.0
Workrate
WR peak, Watts	57 ± 13 †	117 ± 34
WR pred,%	63 ± 21 †	103 ± 20
Borg dyspnea (0–10)	5.2 ± 1.1	5.8 ± 1.8
Borg leg Fatigue (0–10)	4.3 ± 1.2	5.6 ± 1.6

Abbreviations: ${\dot{\mathrm{V}}\mathrm{O}}_{2\mathrm{peak}}$, Peak volume of O₂ consumed; ${\dot{\mathrm{V}}\mathrm{O}}_{2\mathrm{peak}}$, Peak volume of CO₂ produced; ${\dot{\mathrm{V}}}_{\mathit{E}}$_peak, Peak expired ventilation rate; Bf_peak, Peak breathing frequency; Sao₂, Arterial oxygen saturation; HR _peak, Peak heart rate; O₂ Pulse: Oxygen pulse (${\dot{\mathrm{V}}\mathrm{O}}_2$/HR); WR _peak, Peak work rate. Significantly different from controls at P ≤ 0.05 (*) and P ≤ 0.01 (†).