Glucose and Insulin Responses after Commonly Used Sport Feedings before and after a 1-hr Training Session

in International Journal of Sport Nutrition and Exercise Metabolism
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This investigation examined the plasma glucose and insulin response in 6 trained athletes after consumption of four commercially available sport feedings 2 hr before as well as immediately after 1 hr of running under common training conditions. Four feedings were compared: Feeding 1, 160 g CHO/400 ml; Feeding 2, 69 g CHO/400 ml; Feeding 3, 69 g CHO + 6 g protein/400 ml; and Feeding 4, solid 69 g CHO + 5 g protein + 4 g fat. Before the training session, there were no differences between the four sport feedings in the area under the glucose and insulin curves and the insulin/glucose ratio. However, after exercise, Feeding 2 resulted in a significantly greater area under the glucose curve compared with Feedings 1, 3, and 4 (respectively, 352 vs. 241, 251, and 182) and a significantly lower insulin/glucose ratio compared with Feeding 1 (respectively, 6.2 vs. 15.8). Therefore, it is concluded that the kind of sport feeding may influence postexercise glucose and insulin responses.

Z. Hofman is with the Department of Nutritional Sciences and Information, N.V. Verenigde Bedrijven Nutricia, P.O. Box 1, 2700 MA Zoetermeer, The Netherlands. H. Kuipers, H.A. Keizer, E.J. Fransen, and R.C.J. Sewais are with the Department of Movement Sciences, University of Limburg, P.O. Box 616, 6200 MD Maastricht, The Netherlands.