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The effect of gag reflex on cardiac sympatovagal tone

Mehran Hosseini, S. and Jamshir, M. and Maleki, A. (2012) The effect of gag reflex on cardiac sympatovagal tone. Oman Medical Journal, 27 (3). pp. 249-250. ISSN 1999768X (ISSN)

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Objectives: Heart velocity may be influenced by gagging. The medulla oblongata receives the afferents of gag reflex. Neuronal pools of vomiting, salivation and cardiac parasympathetic fibers are very close in this area. So, their activities may be changed by spillover from each other. Using the heart rate variability (HRV) analysis, the effect of gagging on cardiac sympatovagal balance was studied. Methods: ECG was recorded from 9 healthy nonsmoker volunteer students for 10 minutes in the sitting position between 10 and 11 AM. Gagging was elicited by tactile stimulation of the posterior pharyngeal wall. At 1 kHz sampling rate, HRV was calculated. The mean of heart rate at low and high frequencies (LF: 0.04-0.15; HF: 0.15-0.4 Hz) were compared before and after the stimulus. Results: The mean of average heart rate, LF and HF in normalized units (nu) and the ratio of them (LF/HF) before and after the gagging were 89.9 ± 3 and 95.2 ± 3 bpm; 44.2 ± 5.8 and 21.2 ± 4; 31.1 ± 5.3 and 39.4 ± 3.8; and 1.7 ± 0.3 and 0.6 ± 0.2 respectively. Conclusion: Gagging increased heart velocity and had differential effect on two branches of cardiac autonomic nerves. The paradoxical relation between average heart rate and HRV indexes of sympatovagal tone may be due to unequal rate of change in autonomic fiber activities which is masked by 5 minutes interval averaging. © OMSB, 2012.

Item Type: Article
Additional Information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Oman Med. J. [Field not mapped to EPrints] AD - Department of physiology, Golestan university of medical sciences, Gorgan, Iran [Field not mapped to EPrints] AD - Student research committee, Faculty of medicine, Golestan university of medical sciences, Gorgan, Iran [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled Keywords: Gag reflex, HRV, adult, article, breathing, cardiovascular effect, electrocardiogram, gastrointestinal symptom, heart rate variability, human, human experiment, male, normal human, pharynx, tactile stimulation, vagus tone
Subjects: مقالات نمایه شده محققین دانشگاه در سایت ,Web of Science ,Scopus
موارد کلی
Divisions: معاونت تحقیقات و فناوری
Depositing User: GOUMS
Date Deposited: 19 Apr 2015 07:09
Last Modified: 17 Jan 2017 10:32
URI: http://eprints.goums.ac.ir/id/eprint/2006

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