title: Overweight effect on spirometric parameters in adolescents undergoing exercise.
abstract: OBJECTIVE
  To evaluate effects of overweight on spirometric parameters in adolescents who underwent bronchial provocation test for exercise.
  
  
  METHODS
  We included 71 male adolescents. The diagnosis of asthma was done based on participants' clinical history and on the International Study Questionnaire Asthma and Allergies in Childhood, and the diagnosis of obesity was based on body mass index above 95th percentile. The bronchospasm induced by exercise was assessed using the run-walk test on a treadmill for eight minutes. The decrease in forced expiratory volume in one second > or equal to 10% before exercise was considered positive, and to calculate the intensity in exercise-induced bronchospasm we measured the maximum percentage of forced expiratory volume in one second and above the curve area. Data analysis was carried out using the Mann-Whitney U test and Friedman test (ANOVA), followed by Wilcoxon test (p<0.05). In addition, we used Fisher's exact test to analyze the exercise-induced bronchospasm frequency.
  
  
  RESULTS
  Significant differences were observed among obese adolescents in exercise-induced bronchospasm frequency (p=0,013) and in relation to time required for recovery after exercise (p=0,007).
  
  
  CONCLUSIONS
  Overweight can influence the increase in the exercise-induced bronchospasm frequency in non-asthmatic adolescents compared with eutrophic adolescents.
  
  
  OBJECTIVE
  Avaliar o efeito do excesso de peso sobre parâmetros espirométricos em adolescentes submetidos ao teste de broncoprovocação por exercício.
  Participaram do estudo 71 adolescentes do sexo masculino. O diagnóstico de asma foi obtido por meio de histórico clínico e do questionário International Study of Asthma and Allergies in Childhood, e o de obesidade, pelo índice de massa corporal acima do percentil 95. Para avaliar o broncoespasmo induzido pelo exercício, utilizou-se o teste correr/caminhar em esteira ergométrica, com duração de 8 minutos, considerando positivo se diminuição do volume expiratório forçado no primeiro segundo >10% do valor pré-exercício e, para a intensidade do broncoespasmo induzido pelo exercício, foram utilizados o cálculo da queda percentual máxima do volume expiratório forçado no primeiro segundo e a área acima da curva. A análise dos dados foi realizada pelo teste U Mann-Whitney e pela ANOVA de Friedman, seguido do teste de Wilcoxon (p<0,05). O teste de Fisher foi empregado para analisar a frequência de broncoespasmo induzido pelo exercício.
  
  
  RESULTS
  Foram encontradas diferenças significativas quanto à frequência de broncoespasmo induzido pelo exercício (p=0,013) e ao tempo de recuperação pós-exercício (p=0,007) nos adolescentes obesos.
  O excesso de peso pode influenciar no aumento da frequência de broncoespasmo induzido pelo exercício em adolescentes não asmáticos, quando comparados a eutróficos.
authors.affiliation: Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
authors.forename: Rayana de Oliveira
authors.initials: Rde O
authors.lastname: Costa
authors.affiliation: Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
authors.forename: Juliana Pereira
authors.initials: JP
authors.lastname: Silva
authors.affiliation: Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
authors.forename: Eliana Mattos
authors.initials: EM
authors.lastname: Lacerda
authors.affiliation: Universidade Metodista de Piracicaba, Piracicaba, SP, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Dias
authors.affiliation: Universidade Federal de São Carlos, São Carlos, SP, Brazil.
authors.forename: Vitor Alexandre
authors.initials: VA
authors.lastname: Pezolato
authors.affiliation: Universidade Metodista de Piracicaba, Piracicaba, SP, Brazil.
authors.forename: Carlos Alberto da
authors.initials: CA
authors.lastname: Silva
authors.affiliation: Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
authors.forename: Kleverton
authors.initials: K
authors.lastname: Krinski
authors.affiliation: Universidade de Pernambuco, Petrolina, PE, Brazil.
authors.forename: Marco Aurélio de Valois
authors.initials: MA
authors.lastname: Correia
authors.affiliation: Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
authors.forename: Fabrício
authors.initials: F
authors.lastname: Cieslak
mesh_terms: D000293:Adolescent; D001250:Asthma, Exercise-Induced / Q000150:complications* / Q000503:physiopathology; D001985:Bronchial Provocation Tests / Q000379:methods; D002648:Child; D005080:Exercise Test / Q000592:standards*; D006801:Humans; D008297:Male; D050177:Overweight / Q000150:complications* / Q000503:physiopathology; D013147:Spirometry; D013997:Time Factors; D014797:Vital Capacity / Q000502:physiology