title: Reproducibility of heart rate variability from short-term recordings during five manoeuvres in normal subjects.
abstract: OBJECTIVE
  Due to limited and contradictory information available, the reproducibility of temporal and spectral measurements of heart rate variability from short-term recordings was evaluated in normal subjects during supine, controlled breathing, standing, exercise and recovery conditions.
  
  
  METHODS
  Five-minute tachograms from 11 individuals were obtained during the specified manoeuvres, and repeated three times in a five day period. Besides temporal and spectral indexes, the central frequencies were also computed.
  
  
  RESULTS
  The ANOVA presented non-significant differences among the repetitions for any of the parameters studied. Most intra-class correlation coefficients were over 0.68. The central frequency of the low component diminished during the manoeuvres.
  
  
  CONCLUSIONS
  In healthy individuals, the temporal and spectral measurements of the heart rate variability from short-term records are stable in a five day period for the manoeuvres studied. Central frequencies of the spectral components might be used as indexes of the autonomic activity.
authors: Laboratorio de Fisiología Humana, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana - Iztapalapa Av. San Rafael Atlixco #186, Colonia Vicentina, Iztapalapa 09340, D.F México. scas@xanum.uam.mx
authors: S
authors: S
authors: Carrasco
authors: R
authors: R
authors: González
authors: M J
authors: MJ
authors: Gaitán
authors: O
authors: O
authors: Yáñez
mesh_terms: D000328:Adult; D004562:Electrocardiography / Q000379:methods*; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012119:Respiration; D012146:Rest / Q000502:physiology*; D012680:Sensitivity and Specificity; D016683:Supine Position