Document Detail


Central angiotensin AT1 receptors are involved in metabolic adjustments in response to graded exercise in rats.
MedLine Citation:
PMID:  19647773     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To investigate the influence of central angiotensin AT1-receptors blockade on metabolic adjustments during graded exercise, Losartan (Los) was intracerebroventricularly injected in rats before running until fatigue. Oxygen consumption (VO2) was measured (n=6) and blood samples collected (n=7) to determine variations of glucose, lactate and free fatty acids (FFA). Los-rats exhibited a hyperglycemic response, already observed at 20% of maximal work, followed by a higher lactate levels and FFA mobilization from adipose tissue. Despite the reduced total time to fatigue and the higher VO2 associated with reduced mechanical efficiency, exercise led to the attainment of similar levels of effort in both groups. In summary, central AT1-receptor blockade during graded exercise induces hyperglycemia and higher FFA mobilization from adipose tissue at low exercise intensities in rats running at the same absolute exercise intensity. These data suggest that the central angiotensinergic system is involved in metabolic adjustments during exercise since central blockade of AT1-receptors shifts energy balance during graded exercise, similarly to situations of higher and premature sympathetic activation.
Authors:
Laura H R Leite; Ana Cristina R Lacerda; Cl??udio H Balthazar; Umeko Marubayashi; C??ndido C Coimbra
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-06
Journal Detail:
Title:  Peptides     Volume:  30     ISSN:  1873-5169     ISO Abbreviation:  Peptides     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-09-30     Completed Date:  2010-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008690     Medline TA:  Peptides     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1931-5     Citation Subset:  IM    
Affiliation:
Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Angiotensin II Type 1 Receptor Blockers / metabolism
Animals
Blood Glucose / metabolism
Energy Metabolism*
Fatty Acids, Nonesterified / blood
Lactic Acid / blood
Losartan / metabolism
Male
Oxygen Consumption / physiology*
Physical Conditioning, Animal / physiology*
Random Allocation
Rats
Rats, Wistar
Receptor, Angiotensin, Type 1 / metabolism*
Running / physiology
Chemical
Reg. No./Substance:
0/Angiotensin II Type 1 Receptor Blockers; 0/Blood Glucose; 0/Fatty Acids, Nonesterified; 0/Receptor, Angiotensin, Type 1; 114798-26-4/Losartan; 50-21-5/Lactic Acid

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