Assessing a commercially available sports drink on exogenous carbohydrate oxidation, fluid delivery and sustained exercise performance
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- 作者：Justin D Roberts (10)
Michael D Tarpey (10)
Lindsy S Kass (10)
Richard J Tarpey (10)
Michael G Roberts (10) - 关键词：Fructose ; Maltodextrin ; Exogenous carbohydrate oxidation ; Fluid delivery ; Performance
- 刊名：Journal of the International Society of Sports Nutrition
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：11
- 期：1
- 全文大小：373 KB
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Michael D Tarpey (10)
Lindsy S Kass (10)
Richard J Tarpey (10)
Michael G Roberts (10)
10. School of Life & Medical Sciences, University of Hertfordshire, College Lane, Hatfield, Hertfordshire, UK - ISSN：1550-2783
文摘
Background Whilst exogenous carbohydrate oxidation (CHOEXO) is influenced by mono- and disaccharide combinations, debate exists whether such beverages enhance fluid delivery and exercise performance. Therefore, this study aimed to ascertain CHOEXO, fluid delivery and performance times of a commercially available maltodextrin/ fructose beverage in comparison to an isocaloric maltodextrin beverage and placebo. Methods Fourteen club level cyclists (age: 31.79?±-0.02?years; height: 1.79?±-.06?m; weight: 73.69?±-.24?kg; VO2max: 60.38?±-.36?mL?·?kg·-1?min-1) performed three trials involving 2.5?hours continuous exercise at 50% maximum power output (Wmax: 176.71?±-5.92?W) followed by a 60?km cycling performance test. Throughout each trial, athletes were randomly assigned, in a double-blind manner, either: (1) 1.1?g?·?min-1 maltodextrin--.6?g?·?min-1 fructose (MD-?F), (2) 1.7?g?·?min-1 of maltodextrin (MD) or (3) flavoured water (P). In addition, the test beverage at 60?minutes contained 5.0?g of deuterium oxide (2H2O) to assess quantification of fluid delivery. Expired air samples were analysed for CHOEXO according to the 13C/12C ratio method using gas chromatography continuous flow isotope ratio mass spectrometry. Results Peak CHOEXO was significantly greater in the final 30?minutes of submaximal exercise with MD-?F and MD compared to P (1.45?±-.09?g?·?min-1, 1.07?±-.03?g?·?min-1and 0.00?±-.01?g?·?min-1 respectively, P-lt;-.0001), and significantly greater for MD-?F compared to MD (P--.005). The overall appearance of 2H2O in plasma was significantly greater in both P and MD-?F compared to MD (100.27?±-.57?ppm, 92.57?±-.94?ppm and 78.18?±-.07?ppm respectively, P-lt;-.003). There was no significant difference in fluid delivery between P and MD-?F (P--.078). Performance times significantly improved with MD-?F compared with both MD (by 7?min 22?s?±-?min 56?s, or 7.2%) and P (by 6?min 35?s?±-?min 33?s, or 6.5%, P-lt;-.05) over 60?km. Conclusions A commercially available maltodextrin-fructose beverage improves CHOEXO and fluid delivery, which may benefit individuals during sustained moderate intensity exercise. The greater CHOEXO observed when consuming a maltodextrin-fructose beverage may support improved performance times.