title: Expiratory flow limitation and breathing strategies in overweight adolescents during submaximal exercise.
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.
  
  
  METHODS
  Cross-sectional, prospective comparative study.
  
  
  METHODS
  Twenty-six overweight/obese subjects and 25 healthy weight subjects with no known respiratory illness.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Physiotherapy, Princess Margaret Hospital for Children, Perth, Western Australia, Australia.
authors.forename: N
authors.initials: N
authors.lastname: Gibson
authors.affiliation: School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia.
authors.forename: K
authors.initials: K
authors.lastname: Johnston
authors.affiliation: Department of Physiotherapy, Princess Margaret Hospital for Children, Perth, Western Australia, Australia.
authors.forename: N
authors.initials: N
authors.lastname: Bear
authors.affiliation: 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.
authors.forename: S
authors.initials: S
authors.lastname: Stick
authors.affiliation: School of Paediatrics and Child Health, University of Western Australia, Perth, Western Australia, Australia.
authors.forename: K
authors.initials: K
authors.lastname: Logie
authors.affiliation: 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.
authors.forename: G L
authors.initials: GL
authors.lastname: Hall
mesh_terms: D000293:Adolescent; D001835:Body Weight; D002648:Child; D003430:Cross-Sectional Studies; D004417:Dyspnea / Q000209:etiology* / Q000503:physiopathology / Q000517:prevention & control; D015444:Exercise; D005080:Exercise Test; D017079:Exercise Tolerance; D005260:Female; D006801:Humans; D008297:Male; D063766:Pediatric Obesity / Q000150:complications* / Q000503:physiopathology / Q000517:prevention & control; D011446:Prospective Studies; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests / Q000379:methods*; D057185:Sedentary Behavior; D011795:Surveys and Questionnaires
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