Exposure to a mild hyperbaric oxygen environment elevates blood pressure

Abstract

This study aimed to investigate the changes in blood pressure due to mild hyperbaric oxygen at 1.3 atmospheres absolute with approximately 30% oxygen. [Participants and Methods] Ten healthy adults participated in two trials: the control (1 atmosphere absolute with 20.9% oxygen) and the mild hyperbaric oxygen (1.3 atmospheres absolute with approximately 30% oxygen) trials. All participants were exposed to either the control or mild hyperbaric oxygen conditions in a chamber for 45 min on each experiment day. [Results] A lower heart rate and higher peripheral oxygen saturation were observed after exposure in the mild hyperbaric oxygen trial than those in the control trial. After exposure, the change in ratios from the premeasurement of systolic and diastolic blood pressure in the mild hyperbaric oxygen trial was more than that in the control trial, despite no change in the absolute blood pressure values between the two groups during the exposure. [Conclusion] This is the first study to reveal that mild hyperbaric oxygen exposure might be a control method for chronic hypotension. In addition, these results suggest that people with hypertension might require some attention when using mild hyperbaric oxygen.

Examining the Effects of Hyperbaric Oxygen Therapy on the Cardiovascular System and Oxidative Stress in Insulin-Treated and Non-Treated Diabetic Rats

“…The combined treatment of HBOT and NPH insulin demonstrated not only a beneficial effect on the coronary oxidation status but also positive effects on the cardiodynamics of the isolated rat heart. SLVP and dp/dt max are two cardiodynamic parameters that describe the systolic function, while the parameters dp/dt min and DLVP are related to the diastolic function of the heart; all four mentioned cardiodynamic parameters, as well as CF, were improved in the group of rats treated with the combined treatment (DM+INS+HBOT), which is in accordance with the results of similar studies [ 32 , 33 ]. It has been shown that HBOT induces a slow decrease in HR [ 32 ], but this was not recorded in our research.…”

Effects of mild hyperbaric oxygen therapy on timing sequence recovery of muscle fatigue in chinese university male athletes

“… 19 Consequently, MHOT appears to upregulate parasympathetic tone, leading to decreased HR and enhancing autonomic nervous system balance. 45 SpO 2 , a crucial respiratory circulation parameter, maintained consistent levels across all study time points, with no notable differences observed between groups. This suggests that hyperoxia supplementation might not significantly influence athletes' recovery quality or blood oxygen saturation, potentially hinting at a psychological placebo effect.…”

“… 29 However, some reports highlight MHOT's pronounced effect on SpO 2 enhancement, attributed to increased dissolved oxygen levels facilitated by the therapy. 35 , 45 …”