The influence of aerobic fitness status on ventilatory efficiency in patients with coronary artery disease
Clinics
;
70(1): 46-51, 1/2015. tab, graf
Article
in English
| LILACS
| ID: lil-735867
ABSTRACT
OBJECTIVE:
To test the hypotheses that 1) coronary artery disease patients with lower aerobic fitness exhibit a lower ventilatory efficiency and 2) coronary artery disease patients with lower initial aerobic fitness exhibit greater improvements in ventilatory efficiency with aerobic exercise training.METHOD:
A total of 123 patients (61.0±0.7 years) with coronary artery disease were divided according to aerobic fitness status into 3 groups group 1 (n = 34, peak VO2<17.5 ml/kg/min), group 2 (n = 67, peak VO2>17.5 and <24.5 ml/kg/min) and group 3 (n = 22, peak VO2>24.5 ml/kg/min). All patients performed a cardiorespiratory exercise test on a treadmill. Ventilatory efficiency was determined by the lowest VE/VCO2 ratio observed. The exercise training program comprised moderate-intensity aerobic exercise performed 3 times per week for 3 months. Clinicaltrials.gov NCT02106533RESULTS:
Before intervention, group 1 exhibited both lower peak VO2 and lower ventilatory efficiency compared with the other 2 groups (p<0.05). After the exercise training program, group 1 exhibited greater improvements in aerobic fitness and ventilatory efficiency compared with the 2 other groups (group 1 ▵ = -2.5±0.5 units; group 2 ▵ = -0.8±0.3 units; and group 3 ▵ = -1.4±0.6 units, respectively; p<0.05).CONCLUSIONS:
Coronary artery disease patients with lower aerobic fitness status exhibited lower ventilatory efficiency during a graded exercise test. In addition, after 3 months of aerobic exercise training, only the patients with initially lower levels of aerobic fitness exhibited greater improvements in ventilatory efficiency. .
Full text:
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Index:
LILACS (Americas)
Main subject:
Coronary Artery Disease
/
Physical Fitness
/
Pulmonary Ventilation
/
Exercise Therapy
Type of study:
Observational study
Limits:
Female
/
Humans
/
Male
Language:
English
Journal:
Clinics
Journal subject:
Medicine
Year:
2015
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Grupo Total Care/BR
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