Document Detail


Capillary blood lactate concentrations during intermittent all-out exercise.
MedLine Citation:
PMID:  9386204     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The average maximal peak torques of the knee extensor and knee flexor muscles were measured during one, two or three series of 20 maximal contractions at an angular velocity of pi rad s(-1). Each series lasted about 20 s. After the first series, a 10 min rest was allowed before the second series of contractions. In one case only was a third series of contractions performed. Various sequences of contractions of the dominant and contralateral limbs were tested. Capillary blood lactate concentration ([LA]cap) was determined in the blood samples taken from an earlobe during each recovery. The difference between peak capillary blood lactate concentration and the concentration that would have occurred without any previous contraction (delta[LA]cap) was taken as the index of metabolic comparison between the exercise bouts. The mechanical power output during the first series of contractions was similar to that in the second and third series, but the lactate elevation was significantly higher in the first series. The discrepancy between the constancy of the power output and the decrease in lactate elevation was even more evident if delta[LA]cap was calculated as the difference between peak capillary blood lactate concentration and the value measured immediately before the second or third series. The decrease in lactate elevation was not affected by the change of the contracting limb from the first to the second series. In conclusion, the capillary blood lactate concentration profile during intermittent maximal exercise cannot be considered a suitable technique for evaluating lactate production.
Authors:
P Mognoni; N Redolfi; A Colombini; M S Sirtori
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of sports sciences     Volume:  15     ISSN:  0264-0414     ISO Abbreviation:  J Sports Sci     Publication Date:  1997 Oct 
Date Detail:
Created Date:  1997-12-31     Completed Date:  1997-12-31     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8405364     Medline TA:  J Sports Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  469-75     Citation Subset:  IM; S    
Affiliation:
Reparto di fisiologia del lavoro muscolare dell'Istituto di Tecnologie Biomediche Avanzate del C.N.R., Milano, Italy.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Capillaries
Exercise / physiology*
Humans
Lactic Acid / blood*,  metabolism
Male
Muscle Contraction / physiology
Muscle, Skeletal / metabolism*
Probability
Reference Values
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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