Document Detail


Endurance training affects lactate clearance, not lactate production.
MedLine Citation:
PMID:  6401405     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Primed-continuous infusion of [2-3H]- and [U-14C]lactate was used to study the effects of endurance training (running 2 h/day at 29.4 m/min up a 15% gradient) on lactate metabolism in rats. Measurements were made under three metabolic conditions: rest (Re), easy exercise (EE, 13.4 m/min, 1% gradient) and hard exercise (HE, 26.8 m/min, 1% gradient). Blood lactate levels in trained animals increased from 1.0 +/- 0.09 mM in Re to 1.64 +/- 0.21 in EE and 2.66 +/- 0.38 in HE. Control animals also demonstrated an increase in blood lactate with increasing work rate, but values were 1.93 +/- 0.21 and 4.62 +/- 0.57 mM at EE and HE, respectively. Lactate turnover rates (RtLA) measured with [U-14C]lactate increased from 214.0 +/- 17.0 mumol.kg-1.min-1 in Re to 390.3 +/- 31.6 in EE and 518.1 +/- 56.4 in HE. No significant differences in RtLA were observed between controls and trained animals under any condition. Identical relationships between RtLA and exercise or training were obtained with [2-3H]lactate; however, the values obtained were consistently 90% higher than those observed with [U-14C]lactate. Metabolic clearance rate (MCR) for 14C was not significantly different in Re between controls and trained animals (180.6 +/- 27.7 ml.kg-1.min-1). Metabolic clearance of lactate in trained animals was 37 and 107% greater than in controls during EE and HE, respectively. Results indicate that the effect of endurance training is not on production of lactate but on its clearance from the blood.
Authors:
C M Donovan; G A Brooks
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  244     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1983 Jan 
Date Detail:
Created Date:  1983-02-25     Completed Date:  1983-02-25     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E83-92     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbon Dioxide
Female
Gluconeogenesis
Kinetics
Lactates / biosynthesis,  metabolism*
Lactic Acid
Metabolic Clearance Rate
Oxidation-Reduction
Oxygen Consumption
Physical Conditioning, Animal*
Physical Endurance*
Rats
Rats, Inbred Strains
Grant Support
ID/Acronym/Agency:
AM-19577/AM/NIADDK NIH HHS
Chemical
Reg. No./Substance:
0/Lactates; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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