The effect of two types of diet with high and low glycemic index on the immune and hormonal response of male athletes after intense endurance activity

Carbohydrate ingestion during prolonged strenuous exercise attenuates the leukocytosis and subsequent neutrophilia and lymphopenia by maintaining plasma glucose concentration and minimizing stress hormone and inflammatory cytokines responses. The purpose of this study was to determine the effect of pre-exercise high carbohydrate meals with high glycemic index (HGI) or low glycemic index (LGI) on blood leukocyte redistribution during subsequent endurance exercise.The ۲۴ male (age ۲۴.۸ ± ۰.۳۵ yrs, body mass ۷۶.۱ ± ۳.۵ kg, height ۱.۷۷ ± ۰.۰۲ m, body fat percentage ۱۱.۱ ± ۳.۲۳, VO۲ max ۵۱.۱۸ ± ۰.۶۵ ml/ kg/ min) performed two ۹۰ min runs on a treadmill at ۷۰ % VO۲ max two hours after ingesting a high glycemic index or low glycemic index meal. Each isocaloric test meal contained ۱ g/ kg body mass of carbohydrate and the glycemic index values were ۹۴ and ۴۰, respectively. Trials were separated by at least ۷ days in counterbalanced order. Results were analyzed using a two way ANOVA with post hoc Bonferoni comparison as appropriate (p<۰.۰۵).Plasma glucose concentrations were significantly higher in LGI than HGI immediately after exercise. However, there were no significant differences in circulating leukocyte and neutrophil counts, plasma cortisol, interleukin-۶ concentrations between trials.Ingestion of a LGI meal ۲ h before sub maximal exercise maintains plasma glucose concentration during subsequent exercise when compared with ingestion of a HGI meal. However, it seems to have limited effects on circulating leukocyte and neutrophil counts, circulating stress hormone and cytokine responses to exercise.

کلیدواژه ها:

High Glycemic Index ، Low Glycemic Index ، leukocyte redistribution ، cortisol ، interleukin-۶