title: Are smoking and passive smoking related with heart rate variability in male adolescents?
abstract: OBJECTIVE
  To analyze the relation between smoking and passive smoking with heart rate variability parameters in male adolescents.
  
  
  METHODS
  The sample consisted of 1,152 males, aged 14 and 19 years. Data related to smoking and passive smoking were collected using a questionnaire. RR intervals were obtained by a heart rate monitor, on supine position, for 10 minutes. After collecting the RR intervals, time (standard deviation of all RR intervals, root mean square of the squared differences between adjacent normal RR intervals and the percentage of adjacent intervals over 50ms) and frequency domains (low and high frequency and sympathovagal balance) parameters of heart rate variability were obtained.
  
  
  RESULTS
  No significant differences between smoker and nonsmoker adolescents were observed in heart rate variability parameters (p>0.05). Similarly, heart rate variability parameters did not show significant difference between exposed and not exposed to passive smoking (p>0.05).
  
  
  CONCLUSIONS
  Cigarette smoking and passive smoking are not related to heart rate variability in adolescence.
authors.affiliation: Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Renata Melo
authors.initials: RM
authors.lastname: Gondim
authors.affiliation: Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Breno Quintella
authors.initials: BQ
authors.lastname: Farah
authors.affiliation: Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Carolina da Franca Bandeira Ferreira
authors.initials: Cda F
authors.lastname: Santos
authors.affiliation: Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Raphael Mendes
authors.initials: RM
authors.lastname: Ritti-Dias
mesh_terms: D000293:Adolescent; D001938:Brazil / Q000453:epidemiology; D003430:Cross-Sectional Studies; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D012907:Smoking / Q000453:epidemiology / Q000503:physiopathology*; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D013997:Time Factors; D014028:Tobacco Smoke Pollution; D055815:Young Adult
chemical_list: D014028:Tobacco Smoke Pollution