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  • Title: Cardiac autonomic regulation under hypnosis assessed by heart rate variability: spectral analysis and fractal complexity.
    Author: Aubert AE, Verheyden B, Beckers F, Tack J, Vandenberghe J.
    Journal: Neuropsychobiology; 2009; 60(2):104-12. PubMed ID: 19776654.
    Abstract:
    OBJECTIVE: This study examined the effects of hypnosis on autonomic cardiac control. We hypothesized a modification of autonomic modulation of the heart rate with an enhanced vagal tone during hypnosis compared to baseline. METHODS: In 12 healthy subjects (6 men and 6 women, 22.2 +/- 1.0 years of age) ECG was recorded at baseline and during hypnosis. Heart rate variability parameters were obtained in the frequency domain (LFnu: low frequency normalized units, and HFnu: high frequency normalized units) and from nonlinear analysis methods (detrended fluctuation analysis, DFA). RESULTS: Compared to the control condition, hypnosis showed a significantly decreased LFnu, a significantly increased HFnu, and a significantly decreased LF/HF. DFA showed a significantly decreased short-range similarity. Heart rate remained unchanged. CONCLUSION: Autonomic cardiac tone is significantly modified during hypnosis by shifting the balance of the sympathovagal interaction toward an enhanced parasympathetic modulation, accompanied by a reduction of the sympathetic tone and a decreased short-range similarity but without a concomitant change in heart rate. Central and secondary autonomous nervous system changes induced by hypnosis are a possible explanation for our results. Another highly probable explanation is given by a variation in the depth of respiration. Hypnosis appears to prevent the autonomic responses expected during neutral stimulation.
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