The effect of the glycemic index of an evening meal on the metabolic responses to a standard high glycemic index breakfast and subsequent exercise in men.
The present study investigated the effect of the glycemic index of an evening meal on responses to a standard high glycemic index (HGI) breakfast the following morning. The metabolic responses to exercise 3 h after breakfast were also investigated. Seven active males completed 2 trials. In each trial, participants were provided with an evening meal on day 1, which was composed of either HGI or LGI (high or low glycemic index) carbohydrates. On day 2, participants were provided with a standard HGI breakfast and then performed a 60 min run at 65% VO(2max) 3 h later. Plasma glucose and serum insulin concentrations following breakfast were higher in the HGI trial compared to the LGI trial (P < 0.05). During exercise, there were no differences in substrate utilization. The results suggest that consuming a single LGI evening meal can improve glucose tolerance at breakfast but the metabolic responses to subsequent exercise were not affected.
Stevenson
Emma
E
Sport and Exercise Nutrition Research Group, School of Sport and Exercise Sciences, Loughborough University, Leicestershire, UK.
Williams
Clyde
C
Nute
Maria
M
Swaile
Peter
P
Tsui
Monica
M
D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000493:pharmacokinetics*; D038321:Glycemic Index; D006003:Glycogen / Q000378:metabolism*; D006801:Humans; D008297:Male; D019518:Postprandial Period / Q000502:physiology*; D012420:Running / Q000502:physiology*; D013997:Time Factors
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D006003:Glycogen