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• W2519367051 abstract "Diving narcosis results from the complex interaction of gases, activities, and environmental conditions. We hypothesized that these interactions could be separated into their component parts. Where previous studies have tested single cognitive tasks sequentially, we varied inspired partial pressures of CO 2 , N 2 , and O 2 in immersed, exercising subjects while assessing multitasking performance with the Multi-Attribute Task Battery II (MATB-II) flight simulator. Cognitive performance was tested under 20 conditions of gas partial pressure and exercise in 42 male subjects meeting U.S. Navy age and fitness profiles. Inspired nitrogen (N 2 ) and oxygen (O 2 ) partial pressures were 0, 4.5, and 5.6 ATA and 0.21, 1.0, and 1.22 ATA, respectively, at rest and during 100-W immersed exercise with and without 0.075-ATA CO 2 . Linear regression modeled the association of gas partial pressure with task performance while controlling for exercise, hypercapnic ventilatory response, dive training, video game frequency, and age. Subjects served as their own controls. Impairment of memory, attention, and planning, but not motor tasks, was associated with N 2 partial pressures >4.5 ATA. Sea level O 2 at 0.925 ATA partially rescued motor and memory reaction time impaired by 0.075-ATA CO 2 ; however, at hyperbaric pressures an unexpectedly strong interaction between CO 2 , N 2 , and exercise caused incapacitating narcosis with amnesia, which was augmented by O 2 . Perception of narcosis was not correlated with actual scores. The relative contributions of factors associated with diving narcosis will be useful to predict the effects of gas mixtures and exercise conditions on the cognitive performance of divers. The O 2 effects are consistent with O 2 narcosis or enhanced O 2 toxicity." @default.
• W2519367051 created "2016-09-23" @default.
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• W2519367051 date "2016-10-01" @default.
• W2519367051 modified "2023-10-06" @default.
• W2519367051 title "Assessment of the interaction of hyperbaric N₂, CO₂, and O₂ on psychomotor performance in divers" @default.
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• W2519367051 doi "https://doi.org/10.1152/japplphysiol.00534.2016" @default.
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