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A: [6-3H]glucose/[1-13C]glucose ratio (top) and [6,6-2H2]glucose/endogenous glucose ratio (bottom) obtained from time 0 to 360 min in T1D subjects. Shaded box between 120 and 195 min represents exercise period at 50% V̇o2max. B: individual tracer/tracee ratios during the study.
