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1 Department of Anatomy and Physiology, University of Dundee, Dundee, United Kingdom DD1 4HN; and 2 Department of Electronics and Informatics, University of Padua, 35131 Padua, Italy
The purpose of this study was to determine the
efficacy of glutamine in promoting whole body carbohydrate storage and
muscle glycogen resynthesis during recovery from exhaustive exercise. Postabsorptive subjects completed a glycogen-depleting exercise protocol, then consumed 330 ml of one of three drinks, 18.5% (wt/vol) glucose polymer solution, 8 g glutamine in 330 ml glucose polymer solution, or 8 g glutamine in 330 ml placebo, and also received a
primed constant infusion of
[1-13C]glucose for 2 h. Plasma glutamine concentration was increased after consumption of
the glutamine drinks (0.7-1.1 mM,
P < 0.05). In the second hour of
recovery, whole body nonoxidative glucose disposal was increased by
25% after consumption of glutamine in addition to the glucose polymer
(4.48 ± 0.61 vs. 3.59 ± 0.18 mmol/kg, P < 0.05). Oral glutamine alone
promoted storage of muscle glycogen to an extent similar to oral
glucose polymer. Ingestion of glutamine and glucose polymer together
promoted the storage of carbohydrate outside of skeletal muscle, the
most feasible site being the liver.
glycogen synthesis; glucose oxidation; insulin resistance
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