Research design and methods 147 IGT subjects (75 male, 72 female) were randomized to the intervention group (INT) or control group (CON). 106 subjects (52 INT, 54 CON) completed 3 years of intervention. Annually, glucose, insulin and FFA concentrations were determined during fasting and after an oral glucose tolerance test, in addition to measurements of body weight, serum lipids, blood pressure and maximal aerobic capacity.