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Thoracic excursion as an indicator of respiration

Comparison of recordings in the same person (Chamois, a soldier), showing normal respiration at low altitude (top) and periodic respiration at high altitude (bottom). Subject:(A) Tracing obtained in Turin, Italy (255 m, 837 ft); (B) line marking time in seconds; (C) periodic breathing at the Regina Margherita Hut (4,554 m or 14,941 ft). (Source: Mosso A. Life of man on the high Alps. Kiesow EL, trans. London: T Fisher Unwin, 1898.)