Document Detail


Blood lactate and ammonium ion accumulation during graded exercise in humans.
MedLine Citation:
PMID:  6469774     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine the pattern of blood lactate and ammonium ion (NH+4) accumulation during graded exercise in humans. Six adult volunteers performed a maximum O2 uptake (VO2 max) test on a bicycle ergometer. Blood samples were collected each minute of the test. Both blood lactate (r = 0.92) and NH4+ (r = 0.70) increased exponentially in relation to increased work. However, closer examination of individual curves revealed that both metabolites remained near resting levels during mild exercise (less than 40% VO2 max) and then demonstrated abrupt upward break points at increased work loads (greater than 50% VO2 max). There was a significant linear relationship (r = 0.96) between the work load at which the lactate break point (LBP) and NH4+ break point (ABP) occurred in each subject. In addition, there was a significant linear relationship (r = 0.82) between the blood concentrations of NH4+ and lactate during exercise. The results suggest a connection between NH4+ production and glycolytic energy metabolism during exercise. Several possible explanations are offered; however, further work at the cellular level is needed before the exact relationship between NH4+ and lactate can be determined.
Authors:
M J Buono; T R Clancy; J R Cook
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  57     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1984 Jul 
Date Detail:
Created Date:  1984-09-24     Completed Date:  1984-09-24     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  135-9     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Cations, Monovalent
Energy Metabolism
Exercise Test
Female
Humans
Lactates / blood*
Male
Physical Exertion*
Quaternary Ammonium Compounds / blood*
Chemical
Reg. No./Substance:
0/Cations, Monovalent; 0/Lactates; 0/Quaternary Ammonium Compounds

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


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