Document Detail


Lactate removal is not enhanced in nonstimulated perfused skeletal muscle after endurance training.
MedLine Citation:
PMID:  11247928     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of endurance training (running 40 m/min grade for 60 min, 5 days/wk for 8 wk) on skeletal muscle lactate removal was studied in rats by utilizing the isolated hindlimb perfusion technique. Hindlimbs were perfused (single-pass) with Krebs-Henseleit bicarbonate buffer, fresh bovine erythrocytes (hematocrit approximately 30%), 10 mM lactate, and [U-14C]lactate (30,000 dpm/ml). Arterial and venous blood samples were collected every 10 min for the duration of the experiment to assess lactate uptake. During perfusions, no significant differences in skeletal muscle lactate uptake were observed between trained (7.31 +/- 0.20 micromol/min) and control hindlimbs (6.98 +/- 0.43 micromol/min). In support, no significant differences were observed for [14C]lactate uptake in trained (22,776 +/- 370 dpm/min) compared with control hindlimbs (21,924 +/- 1,373 dpm/min). Concomitant with these observations, no significant differences were observed between groups for oxygen consumption (4.93 +/- 0.18 vs. 4.92 +/- 0.13 micromol/min), net skeletal muscle glycogen synthesis (7.1 +/- 0.4 vs. 6.5 +/- 0.3 micromol x 40 min(-1) x g(-1)), or 14CO2 production (2,203 +/- 185 vs. 2,098 +/- 155 dpm/min), trained and control, respectively. These findings indicate that endurance training does not affect lactate uptake or alter the metabolic fate of lactate in quiescent skeletal muscle.
Authors:
K D Sumida; C M Donovan
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  90     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-03-15     Completed Date:  2001-05-31     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1307-13     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, Chapman University, Orange, California 92866, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / physiology
Female
Gluconeogenesis / physiology
Glycogen / metabolism
Hindlimb / physiology
Lactic Acid / metabolism*
Muscle, Skeletal / metabolism*
Oxidation-Reduction
Oxygen Consumption / physiology
Perfusion
Physical Conditioning, Animal / physiology*
Physical Endurance / physiology*
Rats
Rats, Wistar
Grant Support
ID/Acronym/Agency:
DK-48000/DK/NIDDK NIH HHS
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid; 9005-79-2/Glycogen

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