TY - JOUR
T1 - Assessing a commercially available sports drink on exogenous carbohydrate oxidation, fluid delivery and sustained exercise performance.
AU - Justin, Roberts,
AU - Tarpey, Mike
AU - Kass, Lindsy
AU - Tarpey, Richard
AU - Roberts, Michael
N1 - © Roberts et al.; licensee BioMed Central Ltd. 2014.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
PY - 2014/3/4
Y1 - 2014/3/4
N2 - 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 ± 10.02 years; height: 1.79 ± 0.06 m; weight: 73.69 ± 9.24 kg;
VO2max: 60.38 ± 9.36 mL · kg·-1 min−1
) performed three trials involving 2.5 hours continuous exercise at 50%
maximum power output (Wmax: 176.71 ± 25.92 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 + 0.6 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 (2
H2O) 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 ± 0.09 g · min−1
, 1.07 ± 0.03 g · min−1
and 0.00 ± 0.01 g · min−1 respectively, P < 0.0001),
and significantly greater for MD + F compared to MD (P = 0.005). The overall appearance of 2
H2O in plasma was
significantly greater in both P and MD + F compared to MD (100.27 ± 3.57 ppm, 92.57 ± 2.94 ppm and 78.18 ± 4.07 ppm
respectively, P < 0.003). There was no significant difference in fluid delivery between P and MD + F (P = 0.078).
Performance times significantly improved with MD + F compared with both MD (by 7 min 22 s ± 1 min 56 s, or 7.2%)
and P (by 6 min 35 s ± 2 min 33 s, or 6.5%, P < 0.05) 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.
Keywords: Fructose, Maltodextrin, Exogenous carbohydrate oxidation, Fluid delivery, Performance
AB - 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 ± 10.02 years; height: 1.79 ± 0.06 m; weight: 73.69 ± 9.24 kg;
VO2max: 60.38 ± 9.36 mL · kg·-1 min−1
) performed three trials involving 2.5 hours continuous exercise at 50%
maximum power output (Wmax: 176.71 ± 25.92 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 + 0.6 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 (2
H2O) 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 ± 0.09 g · min−1
, 1.07 ± 0.03 g · min−1
and 0.00 ± 0.01 g · min−1 respectively, P < 0.0001),
and significantly greater for MD + F compared to MD (P = 0.005). The overall appearance of 2
H2O in plasma was
significantly greater in both P and MD + F compared to MD (100.27 ± 3.57 ppm, 92.57 ± 2.94 ppm and 78.18 ± 4.07 ppm
respectively, P < 0.003). There was no significant difference in fluid delivery between P and MD + F (P = 0.078).
Performance times significantly improved with MD + F compared with both MD (by 7 min 22 s ± 1 min 56 s, or 7.2%)
and P (by 6 min 35 s ± 2 min 33 s, or 6.5%, P < 0.05) 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.
Keywords: Fructose, Maltodextrin, Exogenous carbohydrate oxidation, Fluid delivery, Performance
U2 - 10.1186/1550-2783-11-8
DO - 10.1186/1550-2783-11-8
M3 - Article
VL - 11
SP - 1
EP - 14
JO - Journal of the International Society of Sports Nutrition
JF - Journal of the International Society of Sports Nutrition
IS - 8
ER -