Table 1.

Subject characteristics

	COPD	Healthy-Control
Age, yr	63.5 ± 2.2	64.0 ± 2.4
Height, m	1.75 ± 0.02	1.81 ± 0.02*
Weight, kg	108 ± 6.1	88.3 ± 3.7*
BMI, kg/m2	34.9 ± 1.5	27.0 ± 1.1*
Peak V̇o2, l/min	1.43 ± 0.13	2.90 ± 0.08*
Peak V̇o2, ml•kg−1•min−1	13.3 ± 1.2	29.4 ± 1.8*
Peak heart rate, beats/min	131 ± 9	161 ± 6.7*
Peak V̇e, l/min	65.6 ± 4.3	117.6 ± 5.5*
SpO2 at peak workload, %	87.7 ± 2.5	94.6 ± 0.3*
Peak workload, W	118 ± 8	236 ± 6*

Values represent means ± SE. COPD, chronic obstructive pulmonary disease; BMI, body mass index; V̇o₂, O₂ consumption; V̇e, minute ventilation; SpO₂, arterial O₂ saturation by pulse oximetry.

^*P < 0.05 vs. COPD.