Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/76215
Title: Effect of Hyperbaric Pressure During Scuba Diving on Autonomic Modulation of the Cardiac Response: Application of the Continuous Wavelet Transform to the Analysis of Heart Rate Variability
Authors: Barbosa, Eduardo
Garcia-Manso, Juan M.
Martin-Gonzalez, Juan M. 
Sarmiento Montesdeoca, Samuel 
Calderon, Francisco J.
Da Silva-Grigoletto, Matzo E.
UNESCO Clasification: 320501 Cardiología
Keywords: Hemodynamic-Responses
Healthy-Volunteers
Hyperoxia
Oxygen
Bradycardia, et al
Issue Date: 2010
Journal: Military Medicine 
Abstract: This study sought to determine the effects of hyperbaric pressure on heart rate modulation, by analyzing potential changes in heart rate variability (HRV). Ten divers were exposed to pressures of 1, 2, 3, and 4 atmospheres absolute (ATA). The test was performed in a hyperbaric chamber. Heart rate (HR) was recorded in supine subjects for 10 minutes per atmosphere. HRV was analyzed in the frequency mode (fast-Fourier transform and continuous wavelet transform). Results confirmed bradycardia as pressure increased. The drop in HR attained statistical significance after 2, 3, and 4 ATA. Signal energy (normalized TP values) rose progressively, becoming significant at 2 ATA. High frequency and low frequency displayed similar behavior in both cases. Although frequency band peaks did not yield clear results, continuous wave transform analysis showed that the frequency spectrum tended to shift into the high-frequency range as pressure increased. In summary, increased pressure prompted increased bradycardia, and HRV shifted into high-frequency range.
URI: http://hdl.handle.net/10553/76215
ISSN: 0026-4075
DOI: 10.7205/MILMED-D-02-0808
Source: Military Medicine [ISSN 0026-4075], v. 175 (1), p. 61-64, (Enero 2010)
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