Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 73: 1334-1339, 1992;
8750-7587/92 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Massicotte, D.
Right arrow Articles by Hillaire-Marcel, C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Massicotte, D.
Right arrow Articles by Hillaire-Marcel, C.

Journal of Applied Physiology, Vol 73, Issue 4 1334-1339, Copyright © 1992 by American Physiological Society

ARTICLES

Oxidation of exogenous medium-chain free fatty acids during prolonged exercise: comparison with glucose

D. Massicotte, F. Peronnet, G. R. Brisson and C. Hillaire-Marcel
Universite du Quebec a Montreal, Canada.

The purpose of this study was to compare the oxidation rate of exogenous 13C-labeled medium-chain triacylglycerols (MCT) with that of an isocaloric amount of exogenous [13C]glucose and to evaluate their respective effects on endocrine and metabolic responses to moderate prolonged exercise. To take into account changes in isotopic composition of 13CO2 arising from oxidation of endogenous substrates because of exercise and/or substrate ingestion that overestimates the oxidation rate of exogenous substrates, two levels of 13C enrichment were used for each substrate. Six young healthy males (20-26 yr of age) completed five 2-h periods of exercise at 65 +/- 3% maximal O2 uptake (VO2max) on a cycle ergometer at 7-day intervals: one control exercise with water ingestion, two trials with ingestion of 25 g of [13C]MCT (trioctanoate) 1 h before exercise, and two trials with 57 g of [13C]glucose (dissolved in 1,000 ml of water) ingested during exercise. Exogenous MCT and glucose began to be oxidized within the first 30 min of exercise, and the oxidation rate increased progressively until the end of exercise for both substrates. Over the 2-h period of exercise, 13.6 +/- 3.5 g of ingested MCT and 36.4 +/- 8.2 g of exogenous glucose were oxidized, which represent 54 and 64%, respectively, of the total amount ingested. The contribution of MCT (119 +/- 31 kcal) and glucose (140 +/- 36 kcal) was not significantly different and represented 7 and 8.5%, respectively, of the total energy expenditure.(ABSTRACT TRUNCATED AT 250 WORDS)


This article has been cited by other articles:


Home page
 Br. J. Sports. Med.Home page
B Knoepfli, M C Riddell, E Ganzoni, A Burki, B Villiger, and S P von Duvillard
Off seasonal and pre-seasonal assessment of circulating energy sources during prolonged running at the anaerobic threshold in competitive triathletes
Br. J. Sports Med., August 1, 2004; 38(4): 402 - 407.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Clin. Nutr.Home page
J. F Horowitz and S. Klein
Lipid metabolism during endurance exercise
Am. J. Clinical Nutrition, August 1, 2000; 72(2): 558S - 563.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
D. J. Angus, M. Hargreaves, J. Dancey, and M. A. Febbraio
Effect of carbohydrate or carbohydrate plus medium-chain triglyceride ingestion on cycling time trial performance
J Appl Physiol, January 1, 2000; 88(1): 113 - 119.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. F. Horowitz, R. Mora-Rodriguez, L. O. Byerley, and E. F. Coyle
Preexercise medium-chain triglyceride ingestion does not alter muscle glycogen use during exercise
J Appl Physiol, January 1, 2000; 88(1): 219 - 225.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online