Document Detail

Autonomic changes during hypnosis: a heart rate variability power spectrum analysis as a marker of sympatho-vagal balance.
MedLine Citation:
PMID:  8200716     Owner:  NLM     Status:  MEDLINE    
Spectral analysis of beat-to-beat variability in electrocardiography is a simple, noninvasive method to analyze sympatho-vagal interaction. The electrocardiogram is analyzed by means of an automatic, autoregressive modeling algorithm that provides a quantitative estimate of R-R interval variability by the computation of power spectral density. Two major peaks are recognizable in this specter: a low-frequency peak (LF, -0.1 Hz), related to the overall autonomic activity (ortho+parasympathetic) and a high-frequency peak (HF, -0.25 Hz), representative of the vagal activity. The LF/HF ratio is an index of the sympatho-vagal interaction. This technique was applied, using a computer-assisted electrocardiograph, to 10 healthy volunteers (6 high and 4 low hypnotizable subjects as determined by the Stanford Hypnotic Susceptibility Scale, Form C) in randomized awake and neutral hypnosis conditions. Preliminary results indicated that hypnosis affects heart rate variability, shifting the balance of the sympatho-vagal interaction toward an enhanced parasympathetic activity, concomitant with a reduction of the sympathetic tone. A positive correlation between hypnotic susceptibility and autonomic responsiveness during hypnosis was also found, with high hypnotizable subjects showing a trend toward a greater increase of vagal efferent activity than did low hypnotizables.
G DeBenedittis; M Cigada; A Bianchi; M G Signorini; S Cerutti
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The International journal of clinical and experimental hypnosis     Volume:  42     ISSN:  0020-7144     ISO Abbreviation:  Int J Clin Exp Hypn     Publication Date:  1994 Apr 
Date Detail:
Created Date:  1994-07-07     Completed Date:  1994-07-07     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376166     Medline TA:  Int J Clin Exp Hypn     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  140-52     Citation Subset:  IM    
Institute of Neurosurgery, University of Milan, Italy.
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MeSH Terms
Arousal / physiology*
Autonomic Nervous System / physiology*
Efferent Pathways / physiology
Fourier Analysis
Heart / innervation
Heart Rate / physiology*
Signal Processing, Computer-Assisted
Sympathetic Nervous System / physiology*
Vagus Nerve / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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