title: Response of erythrocytic 2,3-diphosphoglycerate to strenuous exercise.
abstract: Since increases of erythrocytic 2,3-diphosphoglycerate (2,3-DPG) have been shown to enhance the release of oxygen from hemoglobin, experiments were designed to evaluate the response of 2,3-DPG to two different work-loads in 13 fasted human subjects. No signficant mean change in 2.3-DPG was found following 16 min of strenuous exercise on a bicycle ergometer, but when the subjects were subjected later to a greater workload for 20 min, there was a significant mean decrease in 2.3-DPG despite much individual variation. In addition, there was a significant positive correlation of 2.3-DPG reduction with increases in postexercise lactate, and a significant inverse correlation of oxygen consumption during exercise with postexercise lactate. The data suggest that the 2.3-DPG mechanism may not be compensating in exercise when the workload requires a preponderance of anaerobic metabolism promoting lactacidaemia.
mesh_terms: D000328:Adult; D004163:Diphosphoglyceric Acids / Q000097:blood*; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007773:Lactates / Q000097:blood; D008297:Male; D010101:Oxygen Consumption; D005082:Physical Exertion
chemical_list: D004163:Diphosphoglyceric Acids; D006454:Hemoglobins; D007773:Lactates