title: Method of heart rate variability threshold applied in obese and non-obese pre-adolescents.
abstract: BACKGROUND
  The detection of anaerobic threshold (AT) by heart rate variability analysis (HRVt) may mean a new way to assess the cardiorespiratory capacity (CRC) in pre-adolescents.
  
  
  OBJECTIVE
  To test the method of HRVt to detect AT in non-obese (NO), obese (O) and morbidly obese (MO) pre-adolescents in order to determine differences in their CRC.
  
  
  METHODS
  Were studied 30 pre-adolescents, aged between 9 and 11 years, divided into three groups of ten pre-adolescents each: a) NO group - body mass index (BMI) between 5 and 85 percentiles of the chart of National Center for Chronic Disease Prevention and Health Promotion.; b) O group - BMI between 95 and 97 of the same chart; c) MO group - BMI with percentile over 97. All were submitted to an incremental protocol conducted on a treadmill, and the heart rate was recorded for the detection of the HRVt when the beat-to-beat variability (SD1), extracted from the RR intervals, reached the value of 3 ms.
  
  
  RESULTS
  The mean values obtained at HRVt were higher for the NO group, which included: a) VO2 (ml/kg/min) NO = 27.4 ± 9.2; O = 13.1 ± 7.6, and MO = 11.0 ± 1.7 b) HR (bpm): NO = 156.3 ± 18.0, O = 141.7 ± 11.4 and 137.7 ± 10.4 MO; c) distance (m): NO = 1,194.9 ± 427.7, O = 503.2 ± 437.5 and MO = 399.9 ± 185.1.
  
  
  CONCLUSIONS
  HRVt was effective for evaluation of CRC and could be applied as an alternative method to ergoespirometry in certain situations.
authors.affiliation: Pontifícia Universidade Católica de Campinas, SP, Brazil. fisioni@puc-campinas.edu.br
authors.forename: Mário Augusto
authors.initials: MA
authors.lastname: Paschoal
authors.forename: Caio Cesar
authors.initials: CC
authors.lastname: Fontana
mesh_terms: D015308:Anaerobic Threshold / Q000502:physiology*; D015992:Body Mass Index; D016022:Case-Control Studies; D002648:Child; D005080:Exercise Test / Q000379:methods* / Q000592:standards; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D009767:Obesity, Morbid / Q000503:physiopathology*; D018709:Statistics, Nonparametric