N Gibson1, K Johnston2, N Bear1, S Stick3, K Logie4, G L Hall5. 1. Department of Physiotherapy, Princess Margaret Hospital for Children, Perth, Western Australia, Australia. 2. School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia. 3. 1] Department of Respiratory Medicine, Princess Margaret Hospital for Children, Perth, Western Australia, Australia [2] Telethon Institute for Child Health Research, Centre for Child Health Research, University of Western Australia, Perth, Western Australia, Australia [3] School of Paediatrics and Child Health, University of Western Australia, Perth, Western Australia, Australia. 4. School of Paediatrics and Child Health, University of Western Australia, Perth, Western Australia, Australia. 5. 1] Department of Respiratory Medicine, Princess Margaret Hospital for Children, Perth, Western Australia, Australia [2] Telethon Institute for Child Health Research, Centre for Child Health Research, University of Western Australia, Perth, Western Australia, Australia.
Abstract
OBJECTIVE: To investigate whether ventilatory factors limit exercise in overweight and obese children during a 6-min step test and to compare ventilatory responses during this test with those of healthy weight children. DESIGN: Cross-sectional, prospective comparative study. SUBJECTS: Twenty-six overweight/obese subjects and 25 healthy weight subjects with no known respiratory illness. MEASUREMENTS: Various fatness and fat distribution parameters (using air displacement plethysmography and anthropometry), pulmonary function tests, breath-by-breath gas analysis during exercise, perceived exertion. RESULTS: Young people who are overweight or obese are more likely to experience expiratory flow limitation (expFL) during submaximal exercise compared with their healthy weight peers [OR 7.2 (1.4, 37.3), P=0.019]. Subjects who had lower lung volumes at rest were even more likely to experience exercise-induced expFLs [OR 8.35 (1.4-49.3)]. Both groups displayed similar breathing strategies during submaximal exercise. CONCLUSION: Young people who are overweight/obese are more likely to display expFL during submaximal exercise compared with children of healthy weight . Use of compensatory breathing strategies appeared to enable overweight children to avoid the experience of breathlessness at this intensity of exercise.
OBJECTIVE: To investigate whether ventilatory factors limit exercise in overweight and obesechildren during a 6-min step test and to compare ventilatory responses during this test with those of healthy weight children. DESIGN: Cross-sectional, prospective comparative study. SUBJECTS: Twenty-six overweight/obese subjects and 25 healthy weight subjects with no known respiratory illness. MEASUREMENTS: Various fatness and fat distribution parameters (using air displacement plethysmography and anthropometry), pulmonary function tests, breath-by-breath gas analysis during exercise, perceived exertion. RESULTS: Young people who are overweight or obese are more likely to experience expiratory flow limitation (expFL) during submaximal exercise compared with their healthy weight peers [OR 7.2 (1.4, 37.3), P=0.019]. Subjects who had lower lung volumes at rest were even more likely to experience exercise-induced expFLs [OR 8.35 (1.4-49.3)]. Both groups displayed similar breathing strategies during submaximal exercise. CONCLUSION: Young people who are overweight/obese are more likely to display expFL during submaximal exercise compared with children of healthy weight . Use of compensatory breathing strategies appeared to enable overweight children to avoid the experience of breathlessness at this intensity of exercise.
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