title: Fractal correlation property of heart rate variability in response to the postural change maneuver in healthy women.
abstract: BACKGROUND
  We evaluated the effects of the PCM on the fractal analysis of the HRV in healthy women.
  
  
  METHODS
  We evaluated healthy women between 18 and 30 years old. HRV was analyzed in the time (SDNN, RMSSD, NN50 and pNN50) and frequency (LF, HF and LF/HF ratio) domains as well as short and long-term fractal exponents (alpha-1 and alpha-2) of the detrended fluctuation analysis (DFA). HRV was recorded at rest for ten minutes at seated rest and then the women quickly stood up from a seated position in up to three seconds and remained standing for 15 minutes. HRV was recorded at the following time: rest, 0-5 min, 5-10 min and 10-15 min during standing.
  
  
  RESULTS
  We observed decrease (p < 0.05) in the time-domain indices of HRV between seated and 10-15 minutes after the volunteer stood up. The LF (ms(2)) and HF (ms(2)) indices were also reduced (p < 0.05) at 10-15 minutes after the volunteer stood up compared to seated while the LF (nu) was increased at 5-10 min and 10-15 min (p < 0.05). The short-term alpha-1 exponent was increased (p < 0.05) at all moments investigated compared to seated. Increase in the properties of short-term fractal correlations of heart rate dynamics accompanied by a decrease in the parasympathetic modulation and global HRV was observed in response to the postural change maneuver.
  
  
  CONCLUSIONS
  We suggest that fractal analysis of HRV is more sensitive than frequency and time-domain analysis of HRV during the postural change maneuver.
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil.
authors.forename: Ana Ca
authors.initials: AC
authors.lastname: de Souza
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil.
authors.forename: José R
authors.initials: JR
authors.lastname: Cisternas
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil.
authors.forename: Luiz Carlos
authors.initials: LC
authors.lastname: de Abreu
authors.affiliation: Departamento de Fisioterapia, Faculdade de Filosofia e Ciências, Universidade Estadual Paulista, Marília,UNESP, Av. Higyno Muzzi Filho, 737, Marília, SP 17.525-900, Brazil.
authors.forename: Adriano L
authors.initials: AL
authors.lastname: Roque
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil.
authors.forename: Carlos Bm
authors.initials: CB
authors.lastname: Monteiro
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil.
authors.forename: Fernando
authors.initials: F
authors.lastname: Adami
authors.affiliation: Programa de Pós-Graduação em Fisioterapia, Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, UNESP, R. Roberto Simonsen, 305, Presidente Prudente, SP 19060-900, Brazil.
authors.forename: Luiz Carlos M
authors.initials: LC
authors.lastname: Vanderlei
authors.affiliation: Universidade Estadual Paulista, UNESP, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Bauru, SP 17033-360, Brazil.
authors.forename: Fernando H
authors.initials: FH
authors.lastname: Sousa
authors.affiliation: Programa de Pós-Graduação em Fisioterapia, Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, UNESP, R. Roberto Simonsen, 305, Presidente Prudente, SP 19060-900, Brazil.
authors.forename: Lucas L
authors.initials: LL
authors.lastname: Ferreira
authors.affiliation: Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, Av. Príncipe de Gales, 821, Santo André, SP 09060-650, Brazil ; Programa de Pós-Graduação em Fisioterapia, Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, UNESP, R. Roberto Simonsen, 305, Presidente Prudente, SP 19060-900, Brazil.
authors.forename: Vitor E
authors.initials: VE
authors.lastname: Valenti
keywords: Autonomic nervous system; Cardiovascular system; Nonlinear dynamics; Physiology