| Contraction-by-contraction VO2 and computer-controlled pump perfusion as novel techniques to study skeletal muscle metabolism in situ. | |
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MedLine Citation:
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PMID: 20035064 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this research was to develop new techniques to 1) rapidly sample venous O(2) saturation to determine contraction-by-contraction oxygen uptake (Vo(2)), and 2) precisely control the rate and pattern of blood flow adjustment from one chosen steady state to another. An indwelling inline oximeter probe connected to an Oximetrix 3 meter was used to sample venous oxygen concentration ([O(2)]) (via fractional saturation of Hb with O(2)). Data from the Oximetrix 3 were filtered, deconvolved, and processed by a moving average second by second. Computer software and a program written in-house were used to control blood flow with a peristaltic pump. The isolated canine gastrocnemius muscle complex (GS) in situ was utilized to test these techniques. A step change in metabolic rate was elicited by stimulating GS muscles via their sciatic nerves (supramaximal voltage, 8 V; 50 Hz, 0.2-ms pulse width; train duration 200 ms) at a rate of either 1 contraction/2 s, or 2 contractions/3 s. With arterial [O(2)] maintained constant, blood flow and calculated venous [O(2)] were averaged over each contraction cycle and used in the Fick equation to calculate contraction-by-contraction Vo(2). About 5-8 times more data points were obtained with this method compared with traditional manual sampling. Software-controlled pump perfusion enabled the ability to mimic spontaneous blood flow on-kinetics (tau: 14.3 s) as well as dramatically speed (tau: 2.0 s) and slow (tau: 63.3 s) on-kinetics. These new techniques significantly improve on existing methods for mechanistically altering blood flow kinetics as well as accurately measuring muscle oxygen consumption kinetics during transitions between metabolic rates. |
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Authors:
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Andr?s Hern?ndez; Matthew L Goodwin; Nicola Lai; Marco E Cabrera; James R McDonald; L Bruce Gladden |
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Publication Detail:
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Type: Journal Article Date: 2009-12-24 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 108 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-17 Completed Date: 2010-06-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 705-12 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, Auburn University, Auburn, AL 36849-5323, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Automation, Laboratory Dogs Electric Stimulation Female Infusion Pumps* Kinetics Male Models, Biological Muscle Contraction* Muscle, Skeletal / blood supply, innervation, metabolism* Oximetry* Oxygen / blood* Oxygen Consumption* Oxyhemoglobins / metabolism Regional Blood Flow Sciatic Nerve / physiology Signal Processing, Computer-Assisted* Software |
| Chemical | |
Reg. No./Substance:
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0/Oxyhemoglobins; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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