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

American Journal of Clinical Nutrition 48(4): 1023-1030
Carbohydrate-electrolyte drinks: effects on endurance cycling in the heat
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% VO(2)max and 30 min at 75% VO(2)max, 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 D(2)O 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 D(2)O 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.

Accession: 002042952

PMID: 3421199

DOI: 10.1093/ajcn/48.4.1023

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