title: Effects of pre-exercise sucralose ingestion on carbohydrate oxidation during exercise.
abstract: Recent studies have demonstrated a direct link between increased exogenous CHO oxidation (CHOexog) and enhanced performance. The limiting factor for CHOexog appears to be at the level of intestinal transporters, with sodium/glucose cotransporter 1 (SGLT1) and glucose transporter Type 5 (GLUT5) responsible for glucose and fructose transport, respectively. Studies in animal models have shown that SGLT1 and intestinal glucose uptake are up-regulated by high carbohydrate diets or noncaloric sweeteners. The aim of this study was to determine the effect of preexercise ingestion of noncaloric sweeteners on CHOexog during exercise in athletes. In a randomized, crossover, double-blind fashion twenty-three healthy male cyclists (age = 29 ± 7 yrs, mass = 73.6 ± 7.4 kg, VO2peak = 68.3 ± 9.3 ml/kg/min) consumed 8 × 50 ml doses of either placebo (CON) or 1mM sucralose (SUCRA) every 15 min starting 120 min before the onset of exercise. This was followed by 2h of cycling at 48.5 ± 8.6% of VO2peak with continual ingestion of a maltodextrin drink (1.2 g/min; 828 ml/ hr). Average CHOexog during the first hour of exercise did not differ between SUCRA and CON conditions (0.226 ± 0.081 g/min vs. 0.212 ± 0.076 g/min, Δ =0.015 g/min, 95% CI -0.008 g/min, 0.038 g/min, p = .178). Blood glucose, plasma insulin and lactate, CHO and fat substrate utilization, heart rate, ratings of perceived exertion, and gastrointestinal symptoms did not differ between conditions. Our data suggest that consumption of noncaloric sweeteners in the immediate period before exercise does not lead to a significant increase in CHOexog during exercise.
authors.affiliation: Nestlé Research Center, Lausanne, Switzerland.
authors.forename: Trent
authors.initials: T
authors.lastname: Stellingwerff
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Godin
authors.forename: Maurice
authors.initials: M
authors.lastname: Beaumont
authors.forename: Aude
authors.initials: A
authors.lastname: Tavenard
authors.forename: Dominik
authors.initials: D
authors.lastname: Grathwohl
authors.forename: Peter J
authors.initials: PJ
authors.lastname: van Bladeren
authors.forename: Anne-France
authors.initials: AF
authors.lastname: Kapp
authors.forename: Johannes
authors.initials: J
authors.lastname: le Coutre
authors.forename: Sami
authors.initials: S
authors.lastname: Damak
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001786:Blood Glucose / Q000378:metabolism; D050260:Carbohydrate Metabolism / Q000187:drug effects*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D041981:Gastrointestinal Tract / Q000187:drug effects / Q000378:metabolism; D051296:Glucose Transporter Type 5 / Q000235:genetics / Q000378:metabolism; D006339:Heart Rate; D006801:Humans; D007328:Insulin / Q000097:blood; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010084:Oxidation-Reduction / Q000187:drug effects; D010101:Oxygen Consumption; D010807:Physical Endurance; D011134:Polysaccharides / Q000008:administration & dosage; D051269:Sodium-Glucose Transporter 1 / Q000235:genetics / Q000378:metabolism; D064133:Sports Nutritional Physiological Phenomena; D013395:Sucrose / Q000008:administration & dosage / Q000031:analogs & derivatives*; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D051296:Glucose Transporter Type 5; D007328:Insulin; D011134:Polysaccharides; C495726:SLC2A5 protein, human; C495674:SLC5A1 protein, human; D051269:Sodium-Glucose Transporter 1; D019344:Lactic Acid; D013395:Sucrose; C008315:maltodextrin; C026285:trichlorosucrose