You are not logged in.

No effect of mild heat stress on the regulation of carbohydrate metabolism at the onset of exercise

Saunders, P. U., Watt, M. J., Garnham, Andrew, Spriet, L. L., Hargreaves, M. and Febbraio, M. A. 2001, No effect of mild heat stress on the regulation of carbohydrate metabolism at the onset of exercise, Journal of applied physiology, vol. 91, no. 5, pp. 2282-2288.

Attached Files
Name Description MIMEType Size Downloads

Title No effect of mild heat stress on the regulation of carbohydrate metabolism at the onset of exercise
Author(s) Saunders, P. U.
Watt, M. J.
Garnham, Andrew
Spriet, L. L.
Hargreaves, M.
Febbraio, M. A.
Journal name Journal of applied physiology
Volume number 91
Issue number 5
Start page 2282
End page 2288
Publisher American Physiological Society
Place of publication Washington, D.C.
Publication date 2001-11
ISSN 8750-7587
1522-1601
Keyword(s) glycogen phosphorylase
pyruvate dehydrogenase
temperature
Summary To investigate the influence of heat stress on the regulation of skeletal muscle carbohydrate metabolism, six active, but not specifically trained, men performed 5 min of cycling at a power output eliciting 70% maximal O(2) uptake in either 20 degrees C (Con) or 40 degrees C (Heat) after 20 min of passive exposure to either environmental condition. Although muscle temperature (T(mu)) was similar at rest when comparing trials, 20 min of passive exposure and 5 min of exercise increased (P < 0.05) T(mu) in Heat compared with Con (37.5 +/- 0.1 vs. 36.9 +/- 0.1 degrees C at 5 min for Heat and Con, respectively). Rectal temperature and plasma epinephrine were not different at rest, preexercise, or 5 min of exercise between trials. Although intramuscular glycogen phosphorylase and pyruvate dehydrogenase activity increased (P < 0.05) at the onset of exercise, there were no differences in the activities of these regulatory enzymes when comparing Heat with Con. Accordingly, glycogen use in the first 5 min of exercise was not different when comparing Heat with Con. Similarly, no differences in intramuscular concentrations of glucose 6-phosphate, lactate, pyruvate, acetyl-CoA, creatine, phosphocreatine, or ATP were observed at any time point when comparing Heat with Con. These results demonstrate that, whereas mild heat stress results in a small difference in contracting T(mu), it does not alter the activities of the key regulatory enzymes for carbohydrate metabolism or glycogen use at the onset of exercise, when plasma epinephrine levels are unaltered.
Language eng
Field of Research 060104 Cell Metabolism
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, American Physiological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008395

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 2 times in TR Web of Science
Scopus Citation Count Cited 4 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 536 Abstract Views, 0 File Downloads  -  Detailed Statistics
Created: Mon, 13 Oct 2008, 15:30:53 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.