Does altitude (hypoxic) training improve running for competitive runners? One 2026 meta-analysis of randomized trials (Schwalm, Pilat, Nolte, Gatterer, Krüger, Hollander; Journal of Strength and Conditioning Research 40(11): 1437-1448, published 2026)
What we found
Who and what: a systematic review with meta-analysis of randomized controlled trials. It asked whether training in low-oxygen (hypoxic) conditions changes running economy and performance in competitive middle- and long-distance runners, compared with training at normal oxygen levels.
Which trials counted: randomized trials in which competitive distance runners were exposed to hypoxia for at least 3 weeks while doing endurance training, and were tested under normal-oxygen conditions on running economy, a time trial, time to exhaustion or maximal oxygen uptake (VO2max).
How many: 16 randomized trials were included in the review and 13 in the meta-analysis.
How many runners per outcome: 182 for running economy (11% women), 95 for VO2max (19% women), 134 for time trial (14% women) and 81 for time to exhaustion (4% women).
Running economy: no impact of altitude training. Standardized mean difference -0.2 (95% confidence interval -0.58 to 0.19; p = 0.31; I-squared 33%).
VO2max: no impact. Standardized mean difference 0.33 (95% confidence interval -0.72 to 1.37; p = 0.54; I-squared 82%).
Time trial: no impact. Standardized mean difference -0.34 (95% confidence interval -0.80 to 0.13; p = 0.16; I-squared 42%).
Time to exhaustion: altitude training was better than normal-oxygen training. Standardized mean difference 0.89 (95% confidence interval 0.12 to 1.66; p = 0.02; I-squared 56%).
The authors' conclusion: the available randomized trials do not support an improvement in running economy, VO2max or time trial from altitude training compared with normal-oxygen training, and future trials should specifically study the effect of altitude training on running economy in elite athletes.
What this does not show
The abstract does not say which altitudes, oxygen levels, doses, training programmes or runners' ages the trials used, so the result cannot be turned into a recommendation about any particular camp or device.
The groups were small (81 to 182 runners per outcome) and mostly men (4% to 19% women), and the VO2max result varied a lot between trials (I-squared 82%).
A confidence interval that includes zero means the result does not rule out a small benefit or a small harm; "no impact" in the abstract means no effect was shown, not that none exists.
Time to exhaustion is a lab test of how long a runner keeps going at a fixed effort, not a race time, and the abstract does not link it to racing.
The abstract does not report the effect on race results, injuries or health.
Sources
Schwalm LC, Pilat C, Nolte S, Gatterer H, Krüger K, Hollander K. Does hypoxic training improve running economy and performance of elite and competitive middle- and long-distance runners? A systematic review with meta-analysis of randomized controlled trials. J Strength Cond Res 2026;40(11):1437-1448. https://pubmed.ncbi.nlm.nih.gov/42302183/ (abstract read on 9 November 2026)