Heart rate variability in subjects with different hypnotic susceptibility receiving nociceptive stimulation and suggestions of analgesia

• Published in: 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference Vol. 2005; pp. 6996 - 6999
• Main Authors: Balocchi, R., Varanini, M., Menicucci, D., Santarcangelo, E.L., Migliorini, S., Fontani, G., Carli, G.
• Format: Conference Proceeding Journal Article
• Language: English
• Published: United States IEEE 2005
• Subjects: Biochemistry; Councils; Electrocardiography; Frequency domain analysis; Heart rate; Heart rate variability; HRV; Hypnotic suggestions; Hypnotisability; Monitoring; Pain; Performance analysis; Physiology; Poincaré plot
• ISBN: 0780387414; 9780780387416
• ISSN: 1094-687X; 1557-170X; 1558-4615
• DOI: 10.1109/IEMBS.2005.1616116

The aim of the present study was to investigate the possible hypnotizability-related modulation of heart activity during nociceptive stimulation (pressor pain) and during nociceptive stimulation associated with the suggestion of analgesia in not hypnotized healthy individuals with a high (Highs) and a low (Lows) hypnotic susceptibility. ECG and respirogram were recorded. Standard time and frequency domain indexes were evaluated, together with the sd1 and sd2 values of the Poincare plot over the RR series. Results showed self reports of analgesia in Highs and a significant increase of the respiratory frequency during stimulation in both groups. Very few significant differences between groups and among conditions were detected for mean RR and heart rate variability (HRV) through spectral analysis, and through the Poincare indexes evaluation. On the contrary, a promising approach seems to be the study of the correlations among standard and Poincare variables. In particular, different changes in (or even lost of) correlations were enlightened in Highs and Lows, suggesting a different modulation of RR in the two groups, probably due to the very low frequency components of HRV. Different roles of sympathetic and para sympathetic activities during stimulation can be suggested