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The following chart can be found in an interesting article on Training Peaks blog. From this you should be able to adjust your power level occordingly.


Power does go down as altitude increases. But the offset is air density decreases in parallel (to a point). And this is the reason why many hour records have been attempted at altitude. The optimum is apparently 3500m. Whereby the increase in speed outweighs the loss in power. Hence the popularity of the velodromes in La Paz (Bolivia) at 3400m and Mexico ...

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