Carbohydrate-electrolyte drinks: effects on endurance cycling in the heat.


Journal Article

On three occasions cyclists completed, as fast as possible, two exercise tasks (T1 and T2) separated by 30 min rest. T1 and T2 were equivalent to the work performed during 2 h cycling at 75% VO2max and 30 min at 75% VO2max, respectively. Every 20 min subjects drank 275 mL of a 6% (MC) or 2.5% (LC) carbohydrate-electrolyte beverage or a water placebo (P). The initial drink during both T1 and the rest period contained 20 g D2O as a marker for entry of ingested fluid into blood. No differences in drink effects were found for heart rate, sweat rate, change in plasma volume, rectal temperature, or D2O accumulation in blood. Blood glucose and respiratory exchange ratios were higher and T2 was performed faster with MC than with P. Ingestion of MC can help maintain blood glucose and enhance performance of prolonged cycling exercise without compromising fluid replenishment.

Full Text

Duke Authors

Cited Authors

  • Davis, JM; Lamb, DR; Pate, RR; Slentz, CA; Burgess, WA; Bartoli, WP

Published Date

  • October 1, 1988

Published In

Volume / Issue

  • 48 / 4

Start / End Page

  • 1023 - 1030

PubMed ID

  • 3421199

Pubmed Central ID

  • 3421199

International Standard Serial Number (ISSN)

  • 0002-9165

Digital Object Identifier (DOI)

  • 10.1093/ajcn/48.4.1023


  • eng

Conference Location

  • United States