Fig. 1

Diagram of the progress through the phases of the parallel randomized trial of four groups (enrolment, intervention allocation, follow-up, and data analysis). D + AT + Vit D, diabetic + aerobic training + vitamin D supplement; D + AT, diabetic + aerobic training; D + Vit D, diabetic + vitamin D supplement; D + C, diabetic + control; NC, nondiabetic control