Athletes usually search for strategies to optimize their performance. Manipulation of carbohydrate (CHO) resources glycemic load in order to optimizing athletic performance provides new research areas in nutritional sport. Purpose of this study is to examine the effects of two isocaloric meals with different glycemic load (GL) on exercise performance and serum free fatty acids. Thirty six non-professional athletic women with ages between 19 and 24 were assigned in a double blinded randomized clinical trial with two period cross-over design. Participants in each group received a high or low GL meal as a breakfast, and 7-day wash out period is determined. serum free fatty acid (FFA) measurements were performed before and after each phase of intervention.3 hour After ingestion of a meal, participants run to exhaustion, in a 20 meters shuttle run pacer. Time to exhaustion (TTE) was recorded as a measure of exercise performance. In an attempt to ensure that subjects run to exhaustion, rating of perceived exertion (RPE) was measured, using a Borg scale, too. The ingestion of a low GL or high GL pre-exercise meal did not lead to different TEE and RPE at 3 hours before exercise in female athletic students. Mean changes of serum FFA were higher in low GL than high GL meal. Consumption of a low GL meal compared with a high GL meal at 3-hr before a shuttle run pacer, was not associated with significant changes in TEE and RPE levels but low GL meal led to more increase serum FFA than high GL.
ObjectivesThe importance of adequate dietary carbohydrate for optimal physical performance has long been recognised, but changes in glycemic index and glycemic load of pre-exercise meal might also influence physical exercise and the pattern of substrate utilisation during exercise. The aim of this study was to compare the effect of two meals with high or low glycemic load 3 hour pre-exercise on exercise performance and glycemic response in female athletes.Materials and methodsThirty six non-professional female athletes, aged 19-24 years old were enrolled in a cross-over double-blind randomised clinical trial. Participants in each group received breakfast meal with high or low glycemic load, and 7-day wash out period was determined. Serum glucose and insulin measurements were performed before and after each phase of the intervention. Three hours after ingestion of meal, the subjects ran up to exhaustion in a 20-m shuttle run pacer. 7-days wash out period was determined and then changed the two groups.ResultsThe ingestion of a high or low glycemic load meal three hours before exercise did not lead to significant difference in exercise performance. But mean changes in serum glucose and insulin in the group who had a meal with high glycemic load was higher than those who had had meals with low glycemic load.ConclusionConsumption of a meal with high glycemic load, three hours before a 20-m shuttle run pacer, increased serum glucose and insulin levels during exercise compared to a meal with low glycemic load.(Clinical Trials Registry Number: IRCT201508185062N9)
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