Cardiopulmonary Response to Exercise in COPD and Overweight Patients: Relationship between Unloaded Cycling and Maximal Oxygen Uptake Profiles

Table 1

Morphological characteristics, physiological data at rest, and oxygen uptake at the different epochs of exercise. Asterisks denote significant variations compared to controls (; ; and ). For pulmonary function, values in brackets are the percentage of predicted normal data.

	Controls	COPDs	Overweight subjects
			Hypoxemic	Normoxemic
Number	18	14	12	19
Age, y
Body mass index, kg·m^−2
Forced vital capacity (FVC),; lBTPS (% predicted)	(101%)	(68%)	(70%)	(97%)
Expiratory reserve volume (ERV), lBTPS
Total lung capacity (TLC),; lBTPS (% predicted)	(102%)	(100%)	(75%)	(78%)
Forced expiratory volume in 1 s (FEV1), lBTPS (% predicted)	(96%)	(60%)	(81%)	(86%)
FEV1/FVC, %	86	67	84	79
PaO2	85	67^***	72^*	85
SpO2, %
Heart rate, min^−1
Minute ventilation (VE),; lBTPS·min^−1	11	11	10	13
Respiratory frequency (fR), min^−1	16	18	15	17
Oxygen uptake (VO2),; mlSTPD^−1·kg^−1; VO2 rest
VO2 end unloaded cycling
VO2 threshold