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

Cardiopulmonary response to unloaded cycling may be related to higher workloads. This was assessed in male subjects: 18 healthy sedentary subjects (controls), 14 hypoxemic patients with chronic obstructive pulmonary disease (COPD), and 31 overweight individuals (twelve were hypoxemic). They underwen...

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Bibliographic Details
Published in:BioMed research international 2015-01, Vol.2015 (2015), p.1-7
Main Authors: Samb, Abdoulaye, Cissé, Fallou, Delliaux, Stéphane, Brégeon, Fabienne, Ba, Abdoulaye, Jammes, Yves
Format: Article
Language:English
Subjects:
Adult
Bicycling
Exercise
Exercise Therapy
Experiments
Female
Health aspects
Heart Rate
Humans
Hypoxia
Lung diseases, Obstructive
Male
Middle Aged
Overweight - metabolism
Overweight - physiopathology
Overweight - rehabilitation
Overweight persons
Oxygen
Oxygen Consumption
Physical fitness
Physiological aspects
Pulmonary Disease, Chronic Obstructive - metabolism
Pulmonary Disease, Chronic Obstructive - physiopathology
Pulmonary Disease, Chronic Obstructive - rehabilitation
Ventilation
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Summary:Cardiopulmonary response to unloaded cycling may be related to higher workloads. This was assessed in male subjects: 18 healthy sedentary subjects (controls), 14 hypoxemic patients with chronic obstructive pulmonary disease (COPD), and 31 overweight individuals (twelve were hypoxemic). They underwent an incremental exercise up to the maximal oxygen uptake (VO2max), preceded by a 2 min unloaded cycling period. Oxygen uptake (VO2), heart rate (HR), minute ventilation (VE), and respiratory frequency (fR) were averaged every 10 s. At the end of unloaded cycling period, HR increase was significantly accentuated in COPD and hypoxemic overweight subjects (resp., +14±2 and +13±1.5 min−1, compared to +7.5±1.5 min−1 in normoxemic overweight subjects and +8±1.8 min−1 in controls). The fR increase was accentuated in all overweight subjects (hypoxemic: +4.5±0.8; normoxemic: +3.9±0.7 min−1) compared to controls (+2.5±0.8 min−1) and COPDs (+2.0±0.7 min−1). The plateau VE increase during unloaded cycling was positively correlated with VE values measured at the ventilatory threshold and VO2max. Measurement of ventilation during unloaded cycling may serve to predict the ventilatory performance of COPD patients and overweight subjects during an exercise rehabilitation program.
ISSN:2314-6133
2314-6141
DOI:10.1155/2015/378469