Mixed
In moderately trained individuals, preexercise muscle glycogen availability (low vs. high) does not influence the rate of plasma glucose disposal during low- or moderate-intensity exercise.
If you are moderately trained, your blood sugar management during moderate exercise does not depend on whether you ate carbs beforehand. Your body maintains stable glucose disposal rates whether your muscles are full of glycogen or depleted. Focus on exercise intensity and duration for metabolic benefits rather than manipulating glycogen to alter blood glucose handling.
We conclude that, in moderately trained individuals, muscle glycogen availability (low vs. high) does not influence rates of plasma glucose disposal during either low- or moderate-intensity exercise.
Why this rating
Randomized crossover design with isotope tracers and muscle biopsies in a controlled setting, though sample size is small (n=7).
Source
Regulation of fuel metabolism by preexercise muscle glycogen content and exercise intensity
Melissa J. Arkinstall et al. · Journal of Applied Physiology · 2004
DOI 10.1152/japplphysiol.00421.2004
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