Key result
Full-face mask use during SCUBA diving reduced vascular dysfunction and maintained nitric oxide production compared to half-face masks.
Why the study?
SCUBA diving with standard half-face masks impairs vascular function and nitric oxide availability, but the vascular effects of full-face masks allowing nasal breathing had not been compared to half-face masks.
Does full-face mask use during SCUBA diving prevent vascular dysfunction and oxidative stress compared to half-face mask use?
Does full-face mask use during SCUBA diving prevent vascular dysfunction and oxidative stress compared to half-face mask use?
Using a full-face mask during SCUBA diving allows nasal breathing, which helps maintain nitric oxide production and prevents diving-related endothelial dysfunction and oxidative stress.
Answers are grounded in this paper and cite their sources.
May suggest full-face masks to preserve nasal NO during dives; hypothesis-generating for vascular protection.
Impaired flow mediated dilation (FMD), an index of vascular stress, is known after SCUBA diving. This is related to a dysfunction of nitric oxide (NO) availability and a disturbance of the redox status, possibly induced by hyperoxic/hyperbaric gas breathing. SCUBA diving is usually performed with a mask only covering “half face” (HF) and therefore forcing oral breathing. Nasal NO production is involved in vascular homeostasis and, as consequence, can significantly reduce NO possibly promoting vascular dysfunction. More recently, the utilization of “full-face” (FF) mask, allowing nasal breathing, became more frequent, but no reports are available describing their effects on vascular functions in comparison with HF masks. In this study we assessed and compared the effects of a standard shallow dive (20 min at 10 m) wearing either FF or a HF mask on different markers of vascular function (FMD), oxidative stress (ROS, 8-iso-PGF2α) and NO availability and metabolism (NO2, NOx and 3-NT and iNOS expression). Data from a dive breathing a hypoxic (16% O2 at depth) gas mixture with HF mask are shown allowing hyperoxic/hypoxic exposure. Our data suggest that nasal breathing might significantly reduce the occurrence of vascular dysfunction possibly due to better maintenance of NO production and bioavailability, resulting in a better ability to counter reactive oxygen and nitrogen species. Besides the obvious outcomes in terms of SCUBA diving safety, our data permit a better understanding of the effects of oxygen concentrations, either in normal conditions or as a strategy to induce selected responses in health and disease.
No takes yet. Share an insight, caveat, or question.
Lévénez et al. (2022) studied SCUBA diving-induced vascular stress. Full-face mask vs. Half-face mask was evaluated on Vascular function (FMD), oxidative stress, and NO availability. Full-face mask use during SCUBA diving reduced vascular dysfunction and maintained nitric oxide production compared to half-face masks.
Synapse has enriched 10 related papers. Consider them for comparative context: