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Rates of oxygen consumption with exercise at high altitude during the 1911 Anglo-American Expedition to Pikes Peak

(x, continuous line) Experiments on Pikes Peak; (filled circle, interrupted line) experiments in Oxford, grass track; (dotted circle, dotted line) experiments in Oxford, laboratory. (Source: Douglas CG, Haldane JS, Henderson Y, Schneider EC. Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures. Philosophical Transactions of the Royal Society, Series A 1913;203:185-318.)