title: Physical and psychological factors influencing heart rate variability in anorexia nervosa.
abstract: OBJECTIVE
  The aim of this study was to determine which physical and psychological factors influence the autonomic nervous system (ANS) of patients with anorexia nervosa (AN).
  
  
  METHODS
  The subjects were 14 AN patients and 12 healthy controls. Beat to beat heart rate variability recorded in a supine position with a controlled respiratory rate of 15/min, was analyzed using power spectral analysis. Symptoms of anxiety and depression were assessed by State and Trait Anxiety Inventory and Zung's Self-rating Depression Scale respectively.
  
  
  RESULTS
  Anxiety had a significant negative correlation with the ANS of AN patients. The illness duration times body mass index (BMI), a measure of sustained extreme loss of weight, was also significantly associated with changes in the ANS of AN patients.
  
  
  CONCLUSIONS
  Although the ANS is influenced by various factors, sustained extreme loss of weight seems to be more influential factor in AN patients.
authors.affiliation: Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, Japan. dsyu@cephal.med.kyushu-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Wu
authors.forename: T
authors.initials: T
authors.lastname: Nozaki
authors.forename: T
authors.initials: T
authors.lastname: Inamitsu
authors.forename: C
authors.initials: C
authors.lastname: Kubo
mesh_terms: D000328:Adult; D000856:Anorexia Nervosa / Q000503:physiopathology* / Q000523:psychology*; D001007:Anxiety / Q000503:physiopathology; D001341:Autonomic Nervous System / Q000503:physiopathology*; D015992:Body Mass Index; D016022:Case-Control Studies; D003863:Depression / Q000503:physiopathology; D005260:Female; D006339:Heart Rate; D006801:Humans; D007564:Japan