title: The influence of supine posture on chest wall volume changes is higher in obese than in normal weight children.
abstract: The objective of this study was to analyze thoraco-abdominal kinematics in obese children in seated and supine positions during spontaneous quiet breathing. An observational study of pulmonary function and chest wall volume assessed by optoelectronic plethysmography was conducted on 35 children aged 8-12 years that were divided into 2 groups according to weight/height ratio percentiles: there were 18 obese children with percentiles greater than 95 and 17 normal weight children with percentiles of 5-85. Pulmonary function (forced expiratory volume in 1 s (FEV1); forced vital capacity (FVC); and FEV1/FVC ratio), ventilatory pattern, total and compartment chest wall volume variations, and thoraco-abdominal asynchronies were evaluated. Tidal volume was greater in seated position. Pulmonary and abdominal rib cage tidal volume and their percentage contribution to tidal volume were smaller in supine position in both obese and control children, while abdominal tidal volume and its percentage contribution was greater in the supine position only in obese children and not in controls. No statistically significant differences were found between obese and control children and between supine and seated positions regarding thoraco-abdominal asynchronies. We conclude that in obese children thoraco-abdominal kinematics is influenced by supine posture, with an increase of the abdominal and a decreased rib cage contribution to ventilation, suggesting that in this posture areas of hypoventilation can occur in the lung.
authors: a Departamento de Fisioterapia da Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil.
authors: Letícia
authors: L
authors: Silva
authors: Jacqueline de Melo
authors: Jde M
authors: Barcelar
authors: Catarina Souza
authors: CS
authors: Rattes
authors: Larissa Bouwman
authors: LB
authors: Sayão
authors: Cyda Albuquerque
authors: CA
authors: Reinaux
authors: Shirley L
authors: SL
authors: Campos
authors: Daniella Cunha
authors: DC
authors: Brandão
authors: Guilherme
authors: G
authors: Fregonezi
authors: Andrea
authors: A
authors: Aliverti
authors: Armèle
authors: A
authors: Dornelas de Andrade
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000503:physiopathology*; D010991:Plethysmography / Q000706:statistics & numerical data; D012129:Respiratory Function Tests / Q000706:statistics & numerical data; D016683:Supine Position / Q000502:physiology; D035441:Thoracic Wall / Q000502:physiology*
keywords: child; cinématique; enfant; instrumentation; kinematics; obesity; obésité; optoelectronic plethysmography; pléthysmographie optoélectronique; position; respiratory function tests; tests de fonction respiratoire