摘要：Bronkhorst I, Silva L, Freitas L, Martins M, Martins H, Malfatti C. Vitamin B6 and Maltodextrin Sport Drink Modify Glucose Levels of Elite Mountain Biking Athletes. JEPonline 2014;17(4):113-121. The aim of this study was to analyze the effects of vitamin B6 and/or maltodextrin in pre- and post-exercise conditions and changes in performance and blood glucose (BG) levels in maximal test performed in laboratory on elite mountain biking (MTB) athletes. Eight male bikers [age, 28.4 ± 10.6 yrs; body fat, 9.46 ± 3.76%; VO2 max, 61.13 ± 8.4 mL·kg-1 ·min-1 ] received supplementation drinks composed of carbohydrate (CHO) maltodextrin (1 g·kg-1 ) and/or vitamin B6 (30 mg·kg-1 ) or a placebo (juice light with 3.5 g of maltodextrin) in 500 ml of water. The subjects performed a maximal cycling test on a cycle ergometer at 60 rev·min-1 , starting at 50 W that was increased by 25 W every 3 min until exhaustion. Blood glucose was measured at rest, post-supplementation, and post-exercise testing. The comparisons between variables were made using analysis of variance (ANOVA) with post hoc Bonferroni test. A P<0.01). CHO+vitamin B6 increased blood glucose during the cycle ergometer test, thus indicating that maltodextrin and vitamin B6 supplementation is a good strategy to increase availability of glucose fuel during exercise.
