Lactic and Alactic Oxygen Consumption in Moderate Exercise of Graded Intensity

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Abstract
O2 debt progressed from 0.2 to 4.1 1 as work was varied from 0.21 to 2.1 l/minute O2 requirement. Debts at the higher loads were larger than income lag during work. Equations involving the sum of the exponential components a1e-k1t and a2e-k2t described the rise of O2 intake during work, the decline during debt pay-off and the influence of a 10-fold variation in work load on the parameters. Blood lactate data reported by others support identification of the 2d component as lactate oxidation. Its velocity K2 was related to blood flow; it was faster during exercise than in recovery and became slower as work load increased. Oxidation of alactic debt was governed by K1, which was stable during variation of work load.