Fluid availability of sports drinks differing in carbohydrate type and concentration.
Plasma D2O-accumulation profiles (qualitative indices of fluid-absorption rates) were determined in eight subjects after ingestion of 275 mL of five D2O-labeled beverages: a water placebo (W), 6% maltodextrin (6% M), and three solutions containing a 6%, 8%, and 10% glucose-fructose mix (6% GF, 8% GF, and 10% GF). Except for W all beverages contained 20 mmol sodium/L and 3 mmol potassium/L. No differences in plasma D2O accumulation were found. Plasma glucose increased at 20 and 30 min after ingestion of the carbohydrate drinks and returned to baseline (6% GF and 6% M) or below (8% GF and 10% GF) by 60 min. Insulin responded similarly and, except for a slightly lower value at 30 min for 6% GF, no differences were detected. It appears that fluids in drinks containing less than or equal to 8-10% carbohydrate (simple sugars or maltodextrins) are made available for dilution in body fluids at similar rates and should be similar in replenishing body fluids lost in sweat during exercise.
Davis
J M
JM
Department of Exercise Science, School of Public Health, University of South Carolina, Columbia 29208.
Burgess
W A
WA
Slentz
C A
CA
Bartoli
W P
WP
D000328:Adult; D001628:Beverages / Q000032:analysis*; D001682:Biological Availability; D001786:Blood Glucose / Q000032:analysis; D001826:Body Fluids / Q000032:analysis*; D002241:Carbohydrates / Q000032:analysis* / Q000493:pharmacokinetics; D003903:Deuterium / Q000032:analysis; D017666:Deuterium Oxide; D006801:Humans; D007328:Insulin / Q000097:blood; D008297:Male; D011134:Polysaccharides / Q000032:analysis; D013177:Sports; D014867:Water / Q000032:analysis
D001786:Blood Glucose; D002241:Carbohydrates; D007328:Insulin; D011134:Polysaccharides; D014867:Water; C008315:maltodextrin; D003903:Deuterium; D017666:Deuterium Oxide