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High rates of exogenous carbohydrate oxidation from a mixture of glucose and fructose ingested during prolonged cycling exercise

Published online by Cambridge University Press:  08 March 2007

Roy L. P. G. Jentjens  and
Asker E. Jeukendrup
Roy L. P. G. Jentjens
Affiliation:
Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston B15 2TT, UK
Asker E. Jeukendrup*
Affiliation:
Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston B15 2TT, UK
*
*Corresponding author: Dr Asker E. Jeukendrup, fax +44 (0)121 414 4121, email A.E.Jeukendrup@bham.ac.uk
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Abstract

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A recent study from our laboratory has shown that a mixture of glucose and fructose ingested at a rate of 1·8 g/min leads to peak oxidation rates of approximately 1·3 g/min and results in approximately 55 % higher exogenous carbohydrate (CHO) oxidation rates compared with the ingestion of an isocaloric amount of glucose. The aim of the present study was to investigate whether a mixture of glucose and fructose when ingested at a high rate (2·4 g/min) would lead to even higher exogenous CHO oxidation rates (>1·3 g/min).Eight trained male cyclists (VO2max: 68±1 ml/kg per min) cycled on three different occasions for 150 min at 50 % of maximal power output (60±1 % VO2max) and consumed either water (WAT) or a CHO solution providing 1·2 g/min glucose (GLU) or 1.2 g/min glucose+1·2 g/min fructose (GLU+FRUC). Peak exogenous CHO oxidation rates were higher (P<0·01) in the GLU+FRUC trial compared with the GLU trial (1·75 (se 0·11) and 1·06 (se 0·05) g/min, respectively). Furthermore, exogenous CHO oxidation rates during the last 90 min of exercise were approximately 50 % higher (P<0·05) in GLU+FRUC compared with GLU (1·49 (se 0·08) and 0·99 (se 0·06) g/min, respectively). The results demonstrate that when a mixture of glucose and fructose is ingested at high rates (2·4 g/min) during 150 min of cycling exercise, exogenous CHO oxidation rates reach peak values of approximately 1·75 g/min.

Keywords

Substrate utilizationStable isotopesIntestinal carbohydrate transport
Type
Research Article
Information
British Journal of Nutrition , Volume 93 , Issue 4 , April 2005 , pp. 485 - 492
Copyright
Copyright © The Nutrition Society 2005

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