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

Deb, Sanjoy K. and Brown, Daniel R. and Gough, Lewis A. and McLellan, Christopher P. M. and Swinton, Paul A. and Sparks, S. Andy and McNaughton, Lars R. (2017) Quantifying the effects of acute altitude exposure on exercise performance and capacity: a systematic review and meta-regression. European Journal of Sport Science, 18 (2). pp. 243-256. ISSN 1746-1391


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Health and Wellbeing (1 Jan 2015 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Health and Wellbeing (1 Jan 2015 -)
Date Deposited: 27 Nov 2020 06:20
Last Modified: 01 Dec 2020 00:12
Uncontrolled Keywords: Altitude, intermittent hypoxic training, extreme environments, environmental physiology
Fields of Research (2008): 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified
Fields of Research (2020): 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420799 Sports science and exercise not elsewhere classified
Identification Number or DOI: https://doi.org/10.1080/17461391.2017.1410233
URI: http://eprints.usq.edu.au/id/eprint/40183

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