Quantifying the effects of acute hypoxic exposure on exercise performance and capacity: A systematic review and meta-regression

Deb, Sanjoy K and Brown, Danny and Gough, Lewis A and McLellen, Chris and Swinton, Paul and Sparks, S Andy and McNaughton, Lars R (2017) Quantifying the effects of acute hypoxic exposure on exercise performance and capacity: A systematic review and meta-regression. Quantifying the effects of acute hypoxic exposure on exercise performance and capacity: A systematic review and meta-regression, 18. pp. 243-256.

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Abstract

Objective: To quantify the effects of acute hypoxic exposure on exercise capacity and performance, which includes continuous and intermittent forms of exercise. Design: A systematic review was conducted with a three-level mixed effects meta-regression. The ratio of means method was used to evaluate main effects and moderators providing practical interpretations with percentage change. Data sources: A systemic search was performed using three databases (Google scholar, PubMed and SPORTDiscus). Eligibility criteria for selecting studies: Inclusion was restricted to investigations that assessed exercise performance (time trials (TTs), sprint and intermittent exercise tests) and capacity (time to exhaustion test, TTE) with acute hypoxic (<24 h) exposure and a normoxic comparator. Results: Eighty-two outcomes from 53 studies (N = 798) were included in this review. The results show an overall reduction in exercise performance/capacity −17.8 ± 3.9% (95% CI −22.8% to −11.0%), which was significantly moderated by −6.5 ± 0.9% per 1000 m altitude elevation (95% CI −8.2% to −4.8%) and oxygen saturation (−2.0 ± 0.4%; 95% CI −2.9% to −1.2%). TT (−16.2 ± 4.3%; 95% CI −22.9% to −9%) and TTE (−44.5 ± 6.9%; 95% CI −51.3% to −36.7%) elicited a negative effect, whilst indicating a quadratic relationship between hypoxic magnitude and both TTE and TT performance. Furthermore, exercise less than 2 min exhibited no ergolytic effect from acute hypoxia.Summary/Conclusion: This review highlights the ergolytic effect of acute hypoxic exposure, which is curvilinear for TTE and TT performance with increasing hypoxic levels, but short duration intermittent and sprint exercise seem to be unaffected

Item Type: Article
Subjects: B400 Nutrition
C600 Sports Science
C700 Molecular Biology, Biophysics and Biochemistry
Divisions: REF UoA Output Collections > REF2021 UoA 03: Allied Health Professions, Dentistry, Nursing & Pharmacy
Depositing User: Lewis Gough
Date Deposited: 18 Feb 2019 10:06
Last Modified: 18 Feb 2019 10:06
URI: http://www.open-access.bcu.ac.uk/id/eprint/6999

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