Figure 2.

Substrate oxidation in relation to exercise duration for studies reporting respiratory exchange ratio (RER) at multiple time points comparing overnight-fasted and/or CHO-fed exercise with normal muscle glycogen levels (A), exercise undertaken with high (471 ± 208 mmol kg⁻¹ dry mass) and low (232 ± 112 mmol kg⁻¹ dry mass) muscle glycogen levels (B), and following high (82 ± 10) and low (36 ± 9) glycemic index meals (C). Shaded areas represent 95% confidence intervals. Data were obtained by pooling results from 60 studies (see supplementary files for references).