Oral Glucose Administration after Circuit Resistance Exercise Induced Plasma Ghrelin Suppression

The aim of this study was investigation of effect of oral glucose administration after circuit resistance exercise on plasma ghrelin and some glucoregulatory hormones. Thirteen physical education students volunteered to participate in the present study. Subjects were asked to perform nonstop weight circuit exercises (10exercise at 60% 1RM, 20s time for each, 3 circuits with 3min rest between circuits) while the subjects were overnight fast (at least 12h). Blood samples were taken at immediately after exercise, and then subjects divided randomly to two groups [Glucose Group (GG, n = 7) and Water Group (WG, n = 6)]. GG fed glucose solution (0.5gr in 2.5cc distilled water per 1kg body weight) and WG fed distilled water (2.5 cc/kg body weight), and then blood samples were taken further at 30min, and 90min after exercise. Plasma ghrelin, cortisol, GH, c-peptide, insulin and glucose were determined with RIA, RIA, IRMA, IRMA, IRMA and enzymatic method respectively. Repeated measure ANOVA revealed that changes of plasma ghrein, glucose, insulin, and cortisol in response to glucose solution feeding in compare with water feeding after circuit resistance exercise was significant while for plasma GH and c-peptide were not. In conclusion, plasma ghrelin level suppressed due to administration of glucose solution after circuit resistance exercise, it means that administration of glucose solution perhaps could induce a positive energy balance that involvements of plasma glucose, insulin and cortisol is assumed.