At altitude, reduced atmospheric pressure means less oxygen per breath. VO2max decreases approximately 1% per 100m above 1,500m, causing slower pace for the same perceived effort.
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Pro Tip
Allow at least 3 days at altitude before any important performance - acclimatisation begins immediately but meaningful adaptation takes 2-4 weeks.
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Did You Know?
Kenyan and Ethiopian runners’ dominance is partly explained by growing up and training at 1,800-2,400m altitude year-round.
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