Unlabelled: Backround: Nitrogen narcosis impairs cognitive function, a fact relevant during SCUBA-diving. Oxygen-enriched air (nitrox) became popular in recreational diving, while evidence of its advantages over air is limited.

Aim: Compare effects of nitrox28 and air on two psychometric tests.

Methods: In this prospective, double-blind, open-water study, 108 advanced divers (38 females) were randomized to an air or a nitrox-group for a 60-min dive to 24 m salt water. Breathing gas effects on cognitive performance were assessed during the dive using a short- and long-term memory test and a number connection test.

Results: Nitrox28 divers made fewer mistakes only on the long-term memory test (p = 0.038). Female divers remembered more items than male divers (p < 0.001). There were no significant differences in the number connection test between the groups.

Conclusion: Likely owing to the comparatively low N reduction and the conservative dive, beneficial nitrox28 effects to diver performance were moderate but could contribute to diving safety.

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http://dx.doi.org/10.1080/15438627.2017.1314289DOI Listing

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