title: Influence of Body Composition on Lung Function and Respiratory Muscle Strength in Children With Obesity.
abstract: BACKGROUND
  Obesity affects lung function and respiratory muscle strength. The aim of the present study was to assess lung function and respiratory muscle strength in children with obesity and determine the influence of body composition on these variables.
  
  
  METHODS
  A cross-sectional study was conducted involving 75 children (40 with obesity and 35 within the ideal weight range) aged 6 - 10 years. Body mass index, z score, waist circumference, body composition (tetrapolar bioimpedance), respiratory muscle strength and lung function (spirometry) were evaluated.
  
  
  RESULTS
  Children with obesity exhibited larger quantities of both lean and fat mass in comparison to those in the ideal weight range. No significant differences were found between groups regarding the respective reference values for respiratory muscle strength. Male children with obesity demonstrated significantly lower lung function values (forced expiratory volume in the first second % (FEV1%) and FEV1/forced vital capacity % (FVC%) : 93.76 ± 9.78 and 92.29 ± 3.8, respectively) in comparison to males in the ideal weight range (99.87 ± 9.72 and 96.31 ± 4.82, respectively). The regression models demonstrated that the spirometric variables were influenced by all body composition variables.
  
  
  CONCLUSIONS
  Children with obesity demonstrated a reduction in lung volume and capacity. Thus, anthropometric and body composition characteristics may be predictive factors for altered lung function.
authors.affiliation: Hortolandia City Hall, Sao Paulo, Brazil.
authors.forename: Dirceu
authors.initials: D
authors.lastname: Costa Junior
authors.affiliation: Postgraduate Course in Rehabilitation Sciences, University Nove de Julho, Sao Paulo, Brazil.
authors.forename: Fabiana S
authors.initials: FS
authors.lastname: Peixoto-Souza
authors.affiliation: Postgraduate Course in Rehabilitation Sciences, University Nove de Julho, Sao Paulo, Brazil.
authors.forename: Poliane N
authors.initials: PN
authors.lastname: Araujo
authors.affiliation: Postgraduate Program Federal University of Sao Carlos, Sao Carlos, Brazil.
authors.forename: Marcela C
authors.initials: MC
authors.lastname: Barbalho-Moulin
authors.affiliation: Postgraduate Course in Rehabilitation Sciences, University Nove de Julho, Sao Paulo, Brazil.
authors.forename: Viviane C
authors.initials: VC
authors.lastname: Alves
authors.affiliation: Postgraduate Course in Rehabilitation Sciences, University Nove de Julho, Sao Paulo, Brazil.
authors.forename: Evelim L F D
authors.initials: EL
authors.lastname: Gomes
authors.affiliation: Postgraduate Course in Rehabilitation Sciences, University Nove de Julho, Sao Paulo, Brazil.
authors.forename: Dirceu
authors.initials: D
authors.lastname: Costa
keywords: Body composition; Childhood obesity; Lung function; Respiratory muscle strength; Respiratory system