Carbohydrate-electrolyte feedings and 1 h time trial cycling performance.
The effects of a commercial sports drink on performance in high-intensity cycling was investigated. Nine well-trained subjects were asked to complete a set amount of work as fast as possible (time trial) following 24 h of dietary (subjects were provided with food, energy 57.4+/-2.4 kcal/kg and carbohydrate 9.1+/-0.4 g/kg) and exercise control. During exercise, subjects were provided with 14 mL/kg of either 6% carbohydrate-electrolyte (CHO-E) solution or carbohydrate-free placebo (P). Results showed that subjects' performances did not greatly improve (time, 62:34+/-6:44 min:sec (CHO-E) vs. 62:40+/-5:35 min:sec (P); average power output, 283.0+/-25.0 W (CHO-E) vs. 282.9+/-29.3 W (P), P > 0.05) while consuming the sports drink. It was concluded that CHO-E consumption throughout a 1-h time trial, following a pre-exercise dietary regimen designed to optimize glucose availability, did not improve time or power output to a greater degree than P in well-trained cyclists.
Desbrow
Ben
B
School of Health Science, Griffith University, Gold Coast, QLD 9726, Australia.
Anderson
Sally
S
Barrett
Jennifer
J
Rao
Elissa
E
Hargreaves
Mark
M
D000328:Adult; D001628:Beverages; D001642:Bicycling / Q000502:physiology; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage* / Q000494:pharmacology; D004573:Electrolytes / Q000008:administration & dosage* / Q000494:pharmacology; D005080:Exercise Test; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000187:drug effects / Q000502:physiology; D005082:Physical Exertion / Q000187:drug effects / Q000502:physiology*
D004040:Dietary Carbohydrates; D004573:Electrolytes