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Published on: May 23, 2011
Ambient air, oxygen and nitrox effects on cognitive performance at altitude
1Department of Psychology, Faculty of Applied Sciences, University of Lancaster. j.leach@lancaster.ac.uk
Breathing different gas mixtures at high altitude had subtle effects on cognitive performance. Nitrox gas slightly improved grammatical reasoning, while air, oxygen, and nitrox all improved mathematical reasoning at altitude.
Area of Science:
- Environmental Physiology
- Cognitive Science
- High-Altitude Research
Background:
- Cognitive function can be affected by environmental stressors like high altitude.
- The impact of breathing various gas mixtures (air, oxygen, nitrox) on cognition at altitude is not fully understood.
Purpose of the Study:
- To investigate the effects of breathing air, oxygen, and nitrox gas mixtures on cognitive performance at surface ambient pressures during a high-altitude expedition.
- To determine if gas composition interacts with altitude to influence cognitive abilities.
Main Methods:
- Cognitive tests assessing grammatical and mathematical reasoning were administered.
- Participants breathed air, oxygen, and nitrox gas mixtures at high altitude in Nepal.
- Performance metrics and statistical analyses (including three-way interaction) were employed.
Main Results:
- A slight improvement in grammatical reasoning was observed with nitrox (p < 0.05) at altitude.
- Mathematical reasoning improved significantly with air (p < 0.05), oxygen (p < 0.01), and nitrox (p < 0.01) at altitude.
- Non-significant trends indicated decreasing mathematical ability and increased performance variance with rising partial pressure of oxygen (pO2).
Conclusions:
- Breathing different gas mixtures at high altitude has subtle, specific effects on cognitive functions like reasoning.
- A significant three-way interaction between subject, altitude, and gas type suggests a complex interplay affecting cognition.
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