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Articles in PresS, published online ahead of print December 21, 2001
J Appl Physiol, 10.1152/jap.00482.2001
Submitted on May 18, 2001
Accepted on December 8, 2001
1 School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom
2 Department of Human Biology, Maastricht University, Maastricht, Netherlands
* To whom correspondence should be addressed. E-mail: a.e.jeukendrup{at}bham.ac.uk.
The aim of the present study was to test the hypothesis that the oxidation rate of ingested carbohydrate (CHO) is impaired during exercise in the heat compared with a cool environment. Nine trained cyclists (VO2:65±1 ml/kg bw/min) exercised on two different occasions for 90 min at 55% Wmax at an ambient temperature of either 16.4±0.2°C (Cool) or 35.4±0.1°C (Heat). Subjects received 8% glucose solutions which were enriched with [U-13C]-glucose for measurements of exogenous glucose, plasma glucose, liver derived glucose and muscle glycogen oxidation. Exogenous glucose oxidation during the final 30 min of exercise was significantly (P<0.05) lower in Heat compared with Cool (0.76±0.06 vs. 0.84±0.05 g/min). Muscle glycogen oxidation during the final 30 min of exercise was increased by 25% in the heat (2.07±0.16 vs. 1.66±0.09 g/min; P<0.05) and liver derived glucose oxidation was not different. There was a trend towards a higher total CHO oxidation and a lower plasma glucose oxidation in the heat although this did not reach statistical significance (P=0.087 and P=0.082, resp.). These results demonstrate that the oxidation rate of ingested CHO is reduced and muscle glycogen utilisation is increased during exercise in the heat compared with a cool environment.
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