Effect of acute hypoxia on cognition: A systematic review and meta-regression analysis

Terry McMorris, Beverley J Hale, Martin Barwood, Joseph Costello, Jo Corbett

Research output: Contribution to journalReview articlepeer-review

64 Citations (Scopus)
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Abstract

A systematic meta-regression analysis of the effects of acute hypoxia on the performance of central executive and non-executive tasks, and the effects of the moderating variables, arterial partial pressure of oxygen (PaO2) and hypobaric versus normobaric hypoxia, was undertaken. Studies were included if they were performed on healthy humans; within-subject design was used; data were reported giving the PaO2 or that allowed the PaO2 to be estimated (e.g. arterial oxygen saturation and/or altitude); and the duration of being in a hypoxic state prior to cognitive testing was ≤6days. Twenty-two experiments met the criteria for inclusion and demonstrated a moderate, negative mean effect size (g=-0.49, 95% CI -0.64 to -0.34, p<0.001). There were no significant differences between central executive and non-executive, perception/attention and short-term memory, tasks. Low (35-60mmHg) PaO2 was the key predictor of cognitive performance (R(2)=0.45, p<0.001) and this was independent of whether the exposure was in hypobaric hypoxic or normobaric hypoxic conditions.

Original languageEnglish
Pages (from-to)225-232
Number of pages8
JournalNeuroscience and Biobehavioral Reviews
Volume74
Issue numberPt A
Early online date19 Jan 2017
Publication statusPublished - 1 Mar 2017

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