Abstract
Under normal resting states the concentration of lactic acid in venous blood of normal human beings varies from 10 to 20 mg per 100 cc of blood where the Friedman Contonio and Shaffer method is used. (Peters and Van Slyke). 1 When normal individuals are submitted to mild exercise∗ a slight rise of the lactic acid concentration above the resting level occurs. (Table I.) The average concentration of the lactic acid values was 13.9 mg per 100 cc at rest while after mild exercise it rose to 16.3 mg per 100 cc of blood, an average increase of slightly more than 2 mg per 100 cc. In no instance did the lactic acid concentration exceed 21 mg %. In these 11 cases the hemoglobin concentration and red blood counts were in the normal range.
In Table II we have recorded the resting and post exercise values of the blood lactic acid in 5 normal individuals with high hemoglobin and red counts including one diabetic with a high hemoglobin and red blood count. Excluding the latter the average resting value as well as the average values following exercise are higher than those in the normal range. As in normals a slight but definite rise in the lactic acid concentration takes place, going from an average resting value of 15 mg% to 17.3 mg%, an average increase of slightly over 2 mg%. From this it is evident that normal individuals with high hemoglobin contents and high red blood counts show essentially the same lactic acid response to exercise as normal individuals.
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