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J Appl Physiol 82: 835-840, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 3, pp. 835-840, March 1997
METABOLISM

Exogenous glucose oxidation during exercise in endurance-trained and untrained subjects

A. E. Jeukendrup, M. Mensink, W. H. M. Saris, and A. J. M. Wagenmakers

Department of Human Biology, Maastricht University, 6200 MD Maastricht, The Netherlands

Received 15 July 1996; accepted in final form 1 November 1996.

Jeukendrup, A. E., M. Mensink, W. H. M. Saris, and A. J. M. Wagenmakers. Exogenous glucose oxidation during exercise in endurance-trained and untrained subjects. J. Appl. Physiol. 82(3): 835-840, 1997.---To investigate the effect of training status on the fuel mixture used during exercise with glucose ingestion, seven endurance-trained cyclists (Tr; maximum O2 uptake 67 ± 2.3 ml · kg-1 · min-1) and eight untrained subjects (UTr; 48 ± 2 ml · kg-1 · min-1) were studied during 120 min of exercise at ~60% maximum O2 uptake. At the onset of exercise, 8 ml · kg-1 · min-1 of an 8% naturally enriched [13C]glucose solution was ingested and 2 ml/kg every 15 min thereafter. Energy expenditure was higher in Tr subjects compared with UTr subjects (3,404 vs. 2,630 kJ; P < 0.01). During the second hour, fat oxidation was higher in Tr subjects (37 ± 2 g) compared with UTr subjects (23 ± 1 g), whereas carbohydrate oxidation was similar (116 ± 8 g in Tr subjects vs. 114 ± 4 g in UTr subjects). No differences were observed in exogenous glucose oxidation (50 ± 2 g in Tr subjects and 45 ± 3 g in UTr subjects, respectively). Peak exogenous glucose oxidation rates were similar in the two groups (0.95 ± 0.07 g/min in Tr subjects and 0.96 ± 0.03 g/min in UTr subjects). It is concluded that the higher energy expenditure in Tr subjects during exercise at the same relative exercise intensity is entirely met by a higher rate of fat oxidation without changes in the rates of exogenous and endogenous carbohydrates.

training; carbon 13; breath test; stable isotopes; substrate utilization

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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