Male, newly diagnosed diabetics of the juvenile type have been examined with a short exercise test on a bicycle ergometer and the plasma concentration of glycerol was followed. As earlier shown, the exercise induced a greater lipid mobilization in the diabetics in comparison with control subjects studied earlier.
The exercise test was then repeated after a period of adequate insulin therapy. At the second examination the diabetics showed a clear tendency to normalization of the plasma glycerol curve, indicating that insulin therapy will decrease the abnormally high exercise‐induced lipid mobilization in diabetes mellitus.