Responses to varying rates of carbohydrate ingestion during exercise

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Abstract
The purpose of this study was to determine how the ingestion of carbohydrate at varying rates influences physiological, sensory, and performance responses to prolonged exercise at 65–75% VO2max. Ten subjects ingested either a water placebo (WP) or carbohydrate solutions formulated to provide glucose at the rates of 26, 52, and 78 g. h-1 during 2 h of cycling exercise in a cool (10°C) environment. Beverages were administered in a double-blind, counterbalanced design. A 4.8 km performance test followed each 2 h session. The average time required to complete the performance test was less with the carbohydrate feedings than with WP; mean (±SE) for WP = 505.0 ± 18.7 s, 26 g·h-1 476.0* ± 8.8 s, 52 g·h-1 = 483.8 ± 12.7 s, 78 g·h-1 474.3* ± 19.1 s; *P -1 was associated with improved exercise performance. The data further indicate that a dose-response relationship does not exist between the amount of carbohydrate consumed during exercise and exercise performance.

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