A moderate glycemic meal before endurance exercise can enhance performance

Journal of Applied Physiology
J P KirwanW J Evans

Abstract

The purpose of this study was to determine whether presweetened breakfast cereals with various fiber contents and a moderate glycemic index optimize glucose availability and improve endurance exercise performance. Six recreationally active women ate 75 g of available carbohydrate in the form of breakfast cereals: sweetened whole-grain rolled oats (SRO, 7 g of dietary fiber) or sweetened whole-oat flour (SOF, 3 g of dietary fiber) and 300 ml of water or water alone (Con). The meals were provided 45 min before semirecumbent cycle ergometer exercise to exhaustion at 60% of peak O2 consumption (VO2peak). Diet and physical activity were controlled by having the subjects reside in the General Clinical Research Center for 2 days before each trial. Blood samples were drawn from an antecubital vein for glucose, free fatty acid (FFA), glycerol, insulin, epinephrine, and norepinephrine determination. Breath samples were obtained at 15-min intervals after meal ingestion and at 30-min intervals during exercise. Muscle glycogen concentration was determined from biopsies taken from the vastus lateralis muscle before the meal and immediately after exercise. Plasma FFA concentrations were lower (P < 0.05) during the SRO and SOF trials for the f...Continue Reading

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Citations

Dec 18, 2001·Journal of Applied Physiology·Eduard Jose-CunillerasJon K Linderman
Feb 20, 2004·Journal of Sports Sciences·Mark HargreavesAsker Jeukendrup
Jan 30, 2004·Journal of Sports Sciences·Juul Achten, Asker E Jeukendrup
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