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Hyperbaric oxygen increases parasympathetic activity in professional divers.

V Lund·E Kentala·H Scheinin·J Klossner·K Sariola-Heinonen·J Jalonen
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Abstract

The role of autonomic nervous system in hyperoxic bradycardia was evaluated by using the power-spectral analysis of heart-rate variability (HRV). Ten professional divers went through two hyperbaric hyperoxic experiments: (1) hyperbaric oxygen (HBO), 100% oxygen at 2.5 ATA, (2) hyperbaric air (HBAIR), O(2) 21% at 2.5 ATA. Four-minute traces of ECG were registered and subjected to power-spectral analysis. Cardiac conduction parameters were evaluated by a diagnostic 12-lead ECG and arrhythmias by a continuous 3-lead ECG. Statistical analysis was made using analysis of variance for repeated measurements. Heart rate decreased (P < 0. 001), but the response was similar during both treatments (P=0.14). Total power increased significantly more during HBO than HBAIR (P=0.003). High-frequency (HF) power (P < 0.001), Hayano's index (P=0.001) and normalized units of HF power (P=0.002) increased and LF/HF index (P < 0.001) decreased more during HBO than HBAIR. There were no changes in cardiac conduction or incidence of arrhythmias. In conclusion, 100% oxygen at 2.5 ATA caused marked increase in parasympathetic tone compared with 21% oxygen at 2.5 ATA.

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Analysis of VarianceArrhythmia, SinusAtmospheric PressureDivingHeart RateHumansHyperbaric OxygenationMaleParasympathetic Nervous SystemJournal Article

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V Lund, E Kentala, H Scheinin, J Klossner, K Sariola-Heinonen, J Jalonen. 2000. Hyperbaric oxygen increases parasympathetic activity in professional divers.. https://doi.org/10.1046/j.1365-201x.2000.00761.x

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