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J Appl Physiol (December 2, 2003). doi:10.1152/japplphysiol.01023.2003
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Submitted on September 23, 2003
Accepted on November 3, 2003

Oxidation of exogenous glucose, sucrose and maltose during prolonged cycling exercise

Roy L.P.G. Jentjens1, Michelle C. Venables1, and Asker E. Jeukendrup1*

1 School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom

* To whom correspondence should be addressed. E-mail: a.e.jeukendrup{at}bham.ac.uk.

The purpose of the present study was to investigate whether combined ingestion of two carbohydrates that are absorbed by different intestinal transport mechanisms would lead to exogenous CHO oxidation rates higher than 1.0 g/min. Nine trained male cyclists (VO2max: 64±2 ml.kg body wt-1.min-1) performed 4 exercise trials, which were randomly assigned and separated by at least 1 week. Each trial consisted of 150-min of cycling at 50% of maximal power output (60±1% VO2max) while subjects received a solution providing either 1.8 g/min of glucose (GLU), 1.2 g/min of glucose + 0.6 g/min of sucrose (GLU+SUC), 1.2 g/min of glucose + 0.6 g/min of maltose (GLU+MAL) or water (WAT). Peak exogenous CHO oxidation rates were significantly higher (P<0.05) in the GLU+SUC trial (1.25±0.07 g/min) compared with the GLU and GLU+MAL trial (1.06±0.08 and 1.06±0.06 g/min, respectively). No difference was found in (peak) exogenous CHO oxidation rates between GLU and GLU+MAL. These results demonstrate that when a mixture of glucose and sucrose is ingested at high rates (1.8 g/min) during cycling exercise, exogenous CHO oxidation rates reach peak values of ~1.25 g/min.




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