Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol (December 2, 2003). doi:10.1152/japplphysiol.00974.2003
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Submitted on September 9, 2003
Accepted on November 3, 2003

Oxidation of combined ingestion of glucose and fructose during exercise

Roy L Jentjens1, Luke Moseley1, Rosemary H Waring2, Leslie K Harding3, and Asker E Jeukendrup1*

1 School of Sport and Exercise Sciences, Human Performance Laboratory, University of Birmingham, Birmingham, United Kingdom
2 School of Biosciences, University of Birmingham, Birmingham, United Kingdom
3 Physics & Nuclear Medicine Department, City Hospital NHS Trust, 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 examine whether combined ingestion of a large amount of fructose and glucose during cycling exercise would lead to exogenous carbohydrate oxidation rates greater than 1 g/min. Eight trained cyclists (VO2max: 62±3 ml.kg-1.min-1) performed 4 exercise trials in random order. Each trial consisted of 120 min of cycling at 50% maximum power output while subjects received a solution providing either 1.2 g/min of glucose (Med-GLU), 1.8 g/min of glucose (High-Glu), 0.6 g/min of fructose + 1.2 g/min of glucose (Fruc+Glu) or water (Wat). The ingested fructose was labeled with [U-13C]-fructose and the ingested glucose was labeled with [U-14C]-glucose. Peak exogenous carbohydrate oxidation rates were ~55% higher (P<0.001) in Fruc+Glu (1.26±0.07 g/min) compared with Med-Glu and High-Glu (0.80±0.04 and 0.83±0.05 g/min, respectively). Furthermore, the average exogenous carbohydrate oxidation rates over the 60- to 120-min exercise period were higher (P<0.001) in Fruc+Glu compared with Med-Glu and High-Glu (1.16±0.06, 0.75±0.04 and 0.75±0.04 g/min, respectively).There was a trend towards a lower endogenous carbohydrate oxidation in Fruc+Glu compared with the other two CHO trials, but this failed to reach statistical significance (P=0.075). The present results demonstrate that when fructose and glucose are ingested simultaneously at high rates during cycling exercise, exogenous carbohydrate oxidation rates can reach peak values of ~1.3 g/min.




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