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Plasma deuterium oxide accumulation following ingestion of different carbohydrate beverages

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Optimal fluid delivery from carbohydrate solutions such as oral rehydration solutions or sports drinks is essential. The aim of the study was to investigate whether a beverage containing glucose and fructose would result in greater fluid delivery than a beverage containing glucose alone. Six male subjects were recruited (average age (±SD): 22 ± 2 y). Subjects entered the laboratory between 0700h and 0900h after an overnight fast. A 600 mL bolus of 1 of the 3 experimental beverages was then given. The experimental beverages were water (W), 75 g glucose (G), or 50 g glucose and 25 g fructose (GF); each beverage also contained 3.00 g of D2O. Following administration of the experimental beverage subjects remained in a seated position for 180 min. Blood and saliva samples were then taken every 5 min in the first hour and every 15 min thereafter. Plasma and saliva samples were analyzed for deuterium enrichment by isotope ratio mass spectrometry. Deuterium oxide enrichments were compared using a 2-way repeated measures analysis of variance. The water trial (33 ± 3 min) showed a significantly shorter time to peak than either G (82 ± 40 min) or GF (59 ± 25 min), but the difference between G and GF did not reach statistical significance. There was a significantly greater AUC for GF (55 673 ± 10 020 δ‰ vs. Vienna Standard Mean Ocean Water (VSMOW).180min) and W (60 497 ± 9864 δ‰ vs. VSMOW.180min) compared with G (46 290 ± 9622 δ‰ vs. VSMOW.180min); W and GF were not significantly different from each other. These data suggest that a 12.5% carbohydrate beverage containing glucose and fructose results in more rapid fluid delivery in the first 75 min than a beverage containing glucose alone.

L’apport optimal de fluide procuré par les solutions sucrées telles que les boissons de réhydratation ou boissons du sportif est essentiel. Cette étude se propose de vérifier si l’apport de fluide contenu dans une solution de glucose et de fructose est supérieur à l’apport de fluide contenu dans une solution ne comprenant que du glucose. Six hommes âgés de 22 ± 2 ans participent à cette étude. À jeun depuis la veille, les sujets se présentent au laboratoire entre 7 h et 9 h du matin. On leur demande de boire 600 mL de l’une des trois boissons expérimentales : de l’eau (W), de l’eau contenant 75 g de glucose (G) ou de l’eau contenant 50 g de glucose et 25 g de fructose (GF); toutes les boissons contiennent 3,00 g de D2O. Après la consommation de la boisson expérimentale, les sujets demeurent assis durant 180 min. Toutes les 5 min de la première heure et toutes les 15 min de la période restante, on prélève des échantillons de sang et de salive. Par la suite, on détermine l’augmentation du contenu en deutérium des échantillons de plasma et de salive au moyen de l'analyse du ratio isotopique par spectrométrie de masse. C’est par une analyse de variance à deux facteurs qu’on teste sur le plan statistique les différences de contenu en deutérium. Il faut significativement moins de temps pour atteindre un pic après la consommation d’eau (33 ± 3 min) qu’après la consommation des deux autres boissons (G, 82 ± 40 min et GF, 59 ± 25 min), mais les différences entre ces deux dernières ne sont pas statistiquement significatives. La surface respective sous la courbe de GF (55 673 ± 10 020 δ‰ comparativement à VSMOW.180min) et de W (60 497 ± 9864 δ‰ comparativement à VSMOW.180min) est significativement plus grande que celle sous la courbe de G (46 290 ± 9622 δ‰ comparativement à VSMOW.180min), mais les surfaces sous la courbe de W et de GF ne diffèrent pas l’une de l’autre. D’après ces observations, une boisson contenant 12,5 % de sucres (glucose et fructose) procure un apport plus rapide de fluide durant les 75 premières minutes qu’une boisson ne contenant que du glucose.

Document Type: Research Article

Publication date: December 1, 2008

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  • This bimonthly journal has a 30-year history of publishing, first as the Canadian Journal of Sport Sciences, and later as the Canadian Journal of Applied Physiology. It publishes original research articles, reviews, and commentaries, focussing on the application of physiology, nutrition, and metabolism to the study of human health, physical activity, and fitness. The published research, reviews, and symposia will be of interest to exercise physiologists, physical fitness and exercise rehabilitation specialists, public health and health care professionals, as well as basic and applied physiologists, nutritionists, and biochemists.
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