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[RC] Carb supplementation/heat/performance - Ridecamp Guest

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Authors J Carter, AE Jeukendrup, DA Jones
Title   The effect of sweetness on the efficacy of carbohydrate supplementation 
during exercise in the heat
Full source     Canadian Journal of Applied Physiology - Revue Canadienne de 
Physiologie Appliquee, 2005, Vol 30, Iss 4, pp 379-391

The aim of the present study was to investigate potential mechanisms 
responsible for the improvement in prolonged exercise capacity in hot 
environments with exogenous carbohydrate. Eight endurance-trained men (VO(2)max 
60.5  2.4 ml(.)kg(-1.)min(-1), mean  SE) cycled to exhaustion on three 
occasions at 60% VO(2)max at an ambient temperature of 35 degrees C. They 
ingested either a sweet 64% carbohydrate solution (SC), a nonsweet 64% 
carbohydrate solution (NSC), or water (W). Exercise capacity was significantly 
increased with SC and NSC compared to W the improvements corresponding to 15.8% 
and 11.8%, respectively. No difference in exercise capacity was seen between SC 
and NSC solutions. Plasma glucose concentrations were higher during the SC and 
NSC trials compared to W, significantly so at 10 min and at fatigue. Rates of 
carbohydrate oxidation were higher in the SC and NSC trials, although the rates 
never declined below 2.1  0.2 g(.)min(-1) in the W trial. There was no 
difference in the rate of rise of rectal temperature between trials, but there 
was a trend for subjects to fatigue at higher temperatures during the two 
carbohydrate trials. In conclusion, exogenous carbohydrate, independent of 
sweetness, improves exercise capacity in the heat compared to water alone.

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