Table 3

Measurements at highest common work rate (80 W) in subjects with mild asymptomatic airway obstruction, patients with mild COPD and healthy controls

Asymptomatic airway obstruction
(n=20)
COPD
(n=20)
Healthy controls
(n=20)
Dyspnoea, Borg scale3.3±2.14.6±2.71.6±1.3
Leg discomfort, Borg scale3.7±3.05.1±2.73.0±3.0
V′O2, L/min1.19±0.181.20±0.201.27±0.17
HR, % predicted maximum73.3±8.073.0±9.171.2±7.1
O2 pulse, mL O2/beat10.2±2.810.3±3.611.2±3.4
V′E, L/min38.8±6.939.7±11.936.7±6.9
f, breaths/min21.6±6.123.1±9.119.7±4.0
VT, L1.80±0.291.72±0.461.86±0.38
IRV, L1.42±0.631.29±0.561.78±0.69
IC, L3.22±0.613.01±0.763.64±0.74
  • Values are means±SD. p<0.05 versus controls.

  • f, respiratory rate; HR, heart rate; IC, inspiratory capacity; IRV, inspiratory reserve volume; V′O2, oxygen uptake; V′E, minute ventilation; V′E/V′CO2, ventilatory equivalents for carbon dioxide; VT, tidal volume.