Figure 1. Substrate utilization during submaximal exercise. Substrate utilization during exercise. Fat oxidation during 30W (a) and 70%HRpeak (b), and carbohydrate oxidation during 30W (c) and 70%HRpeak (d). Data are mean ± SEM. **Significant main effect of test, P < 0.01; ***Significant main effect of test, p < 0.001; †Significant group x test interaction, p < 0.05.