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ABSTRACT GAESSER, GLENNA. and GEORGE A. BROOKS. Metabolic bases of excess post-exercise oxygen consumption: a review. Med. Sci. Sports Exerc., Vol. 16, No. 1, pp. 29–43, 1984. The classical “oxygen debt" hypothesis formulated by Hill and associates in the 1920s was an attempt to link the metabolism of lactic acid with the O, consumption in excess of resting that occurs after exercise. The Os debt was hypothesized to represent the oxidation of a minor fraction (1/5) of the lactate formed during exercise, to provide the energy to reconvert the remainder (4/5) of the lactate to glycogen during recovery. In 1933 Margaria et al. modified this hypothesis by distinguishing between initial, fast (“alactacid”), and second, slow (“lactacid"), O-debt curve components. They hypothesized that the fast phase of the post-exercise O, consumption curve was due to the restoration of phosphagen (ATP+ CP). It is now …