Document Detail

Influence of stimulation parameters on the release of adenosine, lactate and CO2 from contracting dog gracilis muscle.
MedLine Citation:
PMID:  8246177     Owner:  NLM     Status:  MEDLINE    
1. The addition of adenosine, CO2 and lactate to the venous blood draining an isolated constant-flow perfused gracilis muscle was studied in anaesthetized and artificially ventilated dogs during twitch and tetanic contractions. 2. Venous adenosine concentration increased from 154 +/- 33 nM (mean +/- S.E.M.) to 279 +/- 121 or 280 +/- 125 nM after 10 min of 1.5 or 3 Hz twitch contractions and to 240 +/- 120 or 276 +/- 139 nM after 10 min of 1 or 5 s tetani occurring at 0.1 Hz. Twitch contractions at 0.1 or 0.5 Hz for 10 min did not significantly elevate venous adenosine. 3. Venous lactate concentration was significantly increased after 10 min of 1.5 or 3 Hz twitches or 5 s tetani at 0.1 Hz. There was a good correlation (r = 0.70; P < 0.001) between venous adenosine and lactate concentrations. 4. Venous partial pressure of CO2 (PCO2) was significantly elevated after 10 min of 1.5 or 3 Hz twitch contractions or 1 or 5 s tetani at 0.1 Hz. There was also a good correlation (r = 0.58; P < 0.001) between venous adenosine concentration and PCO2. 5. Venous partial pressure of O2 (PO2) decreased during all contractions except those at 0.1 Hz, but the oxygen cost per unit of tension x time was similar during every pattern of stimulation, and the percentage of the total energy production achieved by anaerobic means during muscle contractions did not exceed that at rest, indicating that there had been no limitation to the oxygen supply. Venous PO2 was poorly correlated with venous adenosine concentration (r = 0.28), but quite well correlated with venous lactate concentration (r = 0.53; P < 0.001). If the indirect influence of PO2 on venous adenosine concentration via an increase in lactate concentration was eliminated by partial correlation, then the coefficient for the relationship between venous adenosine concentration and venous PO2 became 0.15. 6. There was a significant correlation between the venous adenosine concentration and the venous pH (r = 0.53; P < 0.001). If the influence of oxygenation on venous adenosine and pH was eliminated by partial correlation, the coefficient for the relationship between venous adenosine and pH increased to 0.95.(ABSTRACT TRUNCATED AT 400 WORDS)
F I Achike; H J Ballard
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of physiology     Volume:  463     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1993 Apr 
Date Detail:
Created Date:  1993-12-30     Completed Date:  1993-12-30     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  107-21     Citation Subset:  IM; S    
Department of Physiology, University of Hong Kong.
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MeSH Terms
Adenosine / metabolism*
Anoxia / metabolism
Blood Gas Analysis
Carbon Dioxide / blood,  metabolism*
Electric Stimulation
Hemodynamics / physiology
Hydrogen-Ion Concentration
Lactates / blood,  metabolism*
Lactic Acid
Muscle Contraction / physiology
Muscles / metabolism*
Oxygen Consumption / physiology
Vascular Resistance / physiology
Reg. No./Substance:
0/Lactates; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid; 58-61-7/Adenosine

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