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Natural breathing passing into periodic breathing after holding the breath to the breaking point during the 1911 Anglo-American Expedition to Pikes Peak

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July 12, 1911. Subject: American physiologist Yandell Henderson (1873-1944). Natural breathing, slightly periodic and passing into well-marked periodic breathing after holding the breath to the breaking point (13 seconds) on the evening of arrival on Pikes Peak during the 1911 Anglo-American Expedition to Pikes Peak. (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.)