title: Autonomic dysfunction responses to head-up tilt in anorexia nervosa.
abstract: OBJECTIVE
  Autonomic dysfunction of the cardiovascular system in anorexia nervosa (AN) was reported not only in the rest position, but also in the standing position in some previous studies, which might contribute to cardiac complications such as lethal arrhythmia. However, there has not been sufficient literature in this issue. Therefore, we performed a head-up tilt test, and compared the changes after tilting in indices of autonomic function between AN patients and healthy subjects by heart rate variability (HRV) and blood pressure variability (BPV).
  
  
  METHODS
  The subjects were 21 females with AN and 30 age-matched healthy women. A head-up tilt test was performed following the protocol recommended by the American Heart Association. Blood pressure and heart rate data were collected for 10 min before and after tilting. In the frequency analysis, the powers of low-frequency (LF) and high-frequency (HF) components were calculated by a fast Fourier transformation.
  
  
  RESULTS
  Regarding interactions between groups and head-up tilting, the head-up tilting-induced reduction of the HF component of HRV was significantly greater in the AN group. In addition, increases in the LF/HF of HRV and the LF component of BPV after head-up tilting were significantly smaller in the AN group.
  
  
  CONCLUSIONS
  Regardless of the posture, changes in HF and LF/HF of HRV and LF of BPV in AN patients suggested the presence of autonomic insufficiency.
authors: Department of Stress Sciences and Psychosomatic Medicine, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Yoshiyuki
authors: Y
authors: Takimoto
authors: Kazuhiro
authors: K
authors: Yoshiuchi
authors: Tetsuro
authors: T
authors: Ishizawa
authors: Yoshiharu
authors: Y
authors: Yamamoto
authors: Akira
authors: A
authors: Akabayashi
mesh_terms: D000328:Adult; D000856:Anorexia Nervosa / Q000150:complications* / Q000503:physiopathology*; D001342:Autonomic Nervous System Diseases / Q000209:etiology* / Q000503:physiopathology*; D017704:Baroreflex; D001794:Blood Pressure; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D016683:Supine Position; D018667:Tilt-Table Test; D055815:Young Adult