A Hydrogel Drink With High Fructose Content Generates Higher Exogenous Carbohydrate Oxidation and Lower Dental Biofilm pH Compared to Two Other, Commercially Available, Carbohydrate Sports Drinks

• The purpose of this study was to evaluate the substrate oxidation of three commercially available, 14%-carbohydrate sports drinks with different compositions, osmolality, and pH for their impact on dental exposure to low pH. In a cross-over, randomized double-blinded design, 12 endurance athletes (age 31. 2 +/- 7.7 years, (V) over dotO(2max) 65.6 +/- 5.0 mL.kg(-1)) completed 180 min of cycling at 55% W-max. During the first 100 min of cycling, athletes consumed amylopectin starch (AP), maltodextrin+sucrose (MD+SUC), or maltodextrin+fructose hydrogel (MD+FRU) drinks providing 95 g carbohydrate.h(-1), followed by water intake only at 120 and 160 min. Fuel use was determined using indirect calorimetry and stable-isotope techniques. Additionally, dental biofilm pH was measured using the microtouch method in a subsample of participants (n= 6) during resting conditions before, and at different time intervals up to 45 min following a single bolus of drink. Exogenous carbohydrate oxidation (CHOEXO) during the 2nd hour of exercise was significantly (P< 0.05) different between all three drinks: MD+FRU (1.17 +/- 0.17 g.min(-1)), MD+SUC (1.01 +/- 0.13 g.min(-1)), and AP (0.84 +/- 0.11 g.min(-1)). At the end of exercise, CHO(EXO)and blood glucose concentrations (3.54 +/- 0.50, 4.07 +/- 0.67, and 4.28 +/- 0.47 mmol.L-1, respectively) were significantly lower post MD+FRU consumption than post MD+SUC and AP consumption (P< 0.05). Biofilm acidogenicity at rest demonstrated a less pronounced pH fall for MD+FRU compared to the acidulant-containing MD+SUC and AP (P< 0.05). In conclusion, while total intake of MD+FRU showed signs of completed uptake before end of monitoring, this was less so for MD+SUC, and not at all the case for AP. Thus, this study showed that despite carbohydrates being encapsulated in a hydrogel, a higher CHO(EXO)was observed following MD+FRU drink ingestion compared to AP and MD+SUC consumption upon exposure to the acidic environment of the stomach. This finding may be related to the higher fructose content of the MD+FRU drink compared with the MD+SUC and AP drinks. Furthermore, a carbohydrate solution without added acidulants, which are commonly included in commercial sport drinks, may have less deleterious effects on oral health.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Näringslära (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Nutrition and Dietetics (hsv//eng)

Nyckelord

dental caries

endurance athletes

sports nutrition

stable isotope

substrate oxidation

endurance performance

exercise performance

oral-health

glucose

ingestion

supplementation

consumption

metabolism

alginate

humans

Nutrition & Dietetics

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