Effect of 4 weeks of an intensive exercise program on vaspin serum concentrations in normal glucose tolerant (NGT) individuals and patients with IGT or type 2 diabetes (T2D). Effect of 4 weeks of an intensive exercise program on vaspin serum concentrations in normal glucose tolerant (NGT) individuals and patients with IGT or type 2 diabetes (T2D). Circulating vaspin in groups of NGT (n = 20), IGT (n = 20), and type 2 diabetes (n = 20). Data are means ± SE. *P < 0.05 between baseline and after 4 weeks of intensive physical training. □, basal; ▪, after training. Byung-Soo Youn et al. Diabetes 2008;57:372-377 ©2008 by American Diabetes Association