Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 56: 315-320, 1984;
8750-7587/84 $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 Krzentowski, G.
Right arrow Articles by Lefebvre, P. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Krzentowski, G.
Right arrow Articles by Lefebvre, P. J.

Journal of Applied Physiology, Vol 56, Issue 2 315-320, Copyright © 1984 by American Physiological Society

ARTICLES

Availability of glucose given orally during exercise

G. Krzentowski, B. Jandrain, F. Pirnay, F. Mosora, M. Lacroix, A. S. Luyckx and P. J. Lefebvre

Adequate utilization of glucose given orally during prolonged muscular exercise remains a matter of controversy. The aim of the present study was to investigate whether the time when glucose is ingested during exercise affects exogenous glucose disposal. Nine healthy male volunteers were submitted to a 4-h period of treadmill exercise at about 45% of their maximum O2 consumption. A 100-g load of naturally labeled [13C]glucose was given orally after 120 min (5 subj, group A) or 15 min (4 subj, group B) of exercise. In the 2 h after glucose ingestion, total carbohydrate oxidation (indirect calorimetry) was similar in both groups (A: 147 +/- 12 g/2 h; B: 135 +/- 12 g/2 h) as was lipid oxidation (A: 51 +/- 4 g/2 h; B: 57 +/- 11 g/2 h). Exogenous glucose oxidation was 54 +/- 2 g/h in group A vs. 55 +/- 6 g/2 h in group B. The blood glucose response to oral glucose was similar in the two conditions, whereas the C-peptide response, already modest, was further blunted when glucose was ingested after 2 h of exercise compared with the response observed after 15 min. In conclusion, glucose ingestion during prolonged exercise of moderate intensity is effectively oxidized, 55% of the load given being recovered as expired CO2 within 2 h; utilization of glucose given orally is similar when ingestion takes place 15 or 120 min after initiation of exercise.


This article has been cited by other articles:


Home page
 J. Exp. Biol.Home page
K. C. Welch Jr and R. K. Suarez
Oxidation rate and turnover of ingested sugar in hovering Anna's (Calypte anna) and rufous (Selasphorus rufus) hummingbirds
J. Exp. Biol., June 15, 2007; 210(12): 2154 - 2162.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
P. N. Ainslie, I. T. Campbell, K. N. Frayn, S. M. Humphreys, D. P. M. MacLaren, and T. Reilly
Physiological, metabolic, and performance implications of a prolonged hill walk: influence of energy intake
J Appl Physiol, March 1, 2003; 94(3): 1075 - 1083.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
P. N. Ainslie, I. T. Campbell, K. N. Frayn, S. M. Humphreys, D. P. M. Maclaren, and T. Reilly
Physiological and metabolic responses to a hill walk
J Appl Physiol, January 1, 2002; 92(1): 179 - 187.
[Abstract] [Full Text] [PDF]


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