Oxygen debt in aerobic work.

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Abstract
This investigation was designed to determine the time relations of changes in O2 consumption, O2, debt, blood lactate, and "excess lactate" during aerobic work and recovery. Experiments were carried out in which men worked on the treadmill for periods of 3, 8, and 14 min. and, in some experiments, for 25 min. Oxygen debts determined following these work periods (3-25 min.) varied with the intensity and O2 requirement of the work, but did not vary with the duration of work performed at a given rate. This was true in nonathletic men and in a trained distance runner. The constancy of the O2 consumption and of the respiratory O2 debt after the 3rd min. of constant aerobic work, and their direct relations to each other and to the rate of work, suggests that the level of O2 consumption in the work is dependent on the maintenance of a constant O2 debt as the work is continued. The lag in O2 consumption in the early minutes of exercise appeared to be more directly dependent on the time required to develop an O2 need, and thus to prepare the tissues to accept O2, than on a lag in the O2 supplied by the circulatory and respiratory systems.

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