AJP - Regu Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Am J Physiol Regul Integr Comp Physiol 254: R302-R309, 1988;
0363-6119/88 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
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 Parkhouse, W. S.
Right arrow Articles by Hochachka, P. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Parkhouse, W. S.
Right arrow Articles by Hochachka, P. W.

AJP - Regulatory, Integrative and Comparative Physiology, Vol 254, Issue 2 302-R309, Copyright © 1988 by American Physiological Society

ARTICLES

Organization of energy provision in rainbow trout during exercise

W. S. Parkhouse, G. P. Dobson and P. W. Hochachka
Department of Zoology, University of British Columbia, Vancouver, Canada.

The purpose of this investigation was to examine the fuels supporting high-intensity progressive exercise and their regulation within rainbow trout. During the sustained swim, red muscle (RM) used 97% (17.5 mumol/g) of its glycogen, whereas white muscle (WM) glycogen only declined 31% (7.3 mumol/g). During the burst swim, WM glycogen content decreased 10.4 mumol/g at a rate that exceeded the sustained swim rate by 6.2-fold. Lactate content increased 11-fold at a rate 25 times its sustained swim rate. The exhaustive swim resulted in a decrease of 36.6 mumol/g in liver glycogen, whereas WM glycogen content declined to very low values and lactate reached 43 mumol/g. RM glycogen levels remained low during these exercise bouts. Phosphocreatine (PCr)-buffered ATP declines (WM 7.3-2.7 mumol/g, RM 3.4-1.6 mumol/g) with the time course of the large ATP decreases being related to near depletion of PCr. Decreases in the total adenylate pool were compensated for by the accumulation of inosine 5'-monophosphate in both tissue types. Free ADP (ADPf) contents increased in both tissues by three- to fivefold. ATP/ADPf and cytosolic phosphorylation potentials decreased from 7- to 20-fold. Cytosolic redox potential remained relatively constant at approximately 145 within both fiber types. The changes in adenine nucleotide parameters are associated with the respective activation of the different fiber types and glycolytic flux.


This article has been cited by other articles:


Home page
 J. Exp. Biol.Home page
R. L. Sharpe and C. L. Milligan
Lactate efflux from sarcolemmal vesicles isolated from rainbow trout Oncorhynchus mykiss white muscle is via simple diffusion
J. Exp. Biol., February 1, 2003; 206(3): 543 - 549.
[Abstract] [Full Text] [PDF]


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