| A comparison of exercise type and intensity on the noninvasive assessment of skeletal muscle mitochondrial function using near infrared spectroscopy. | |
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MedLine Citation:
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PMID: 23154991 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Near infrared spectroscopy (NIRS) can be used to measure muscle oxygen consumption (mVO(2)) using arterial occlusions. The recovery rate of mVO(2) after exercise can provide an index of skeletal muscle mitochondrial function. The purpose of this study was to test the influence of exercise modality and intensity on NIRS measurements of mitochondrial function. Three experiments were performed. Thirty subjects (age: 18 - 27 years) were. NIRS signals were corrected for blood volume changes. The recovery of mVO(2) after exercise was fit to a monoexponential curve, and a rate constant was calculated (directly related to mitochondrial function). No differences were found in NIRS rate constants for VOL and ES exercises (2.04 ± 0.57 vs. 2.01 ± 0.59 min(-1) for VOL and ES respectively; p = 0.317). NIRS rate constants were independent of the contraction frequency for both VOL and ES (VOL : p = 0.166; and ES: p = 0.780). ES current intensity resulted in significant changes to the normalized time-tension integral (54 ± 11, 82 ± 7, and 100 ± 0% for low, medium, and high currents respectively; p < 0.001), but did not influence NIRS rate constants (2.02 ± 0.54, 1.95 ± 0.44, 2.02 ± 0.46 min-1 for low, medium, and high currents respectively; p = 0.771). In summary, NIRS measurements of skeletal muscle mitochondrial function can be compared between VOL and ES exercises, and were independent of the intensity of exercise. NIRS represents an important new technique that is practical for testing in research and clinical settings. |
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Authors:
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Terence Edward Ryan; Jared Todd Brizendine; Kevin K McCully |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-15 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: - ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1University of Georgia. |
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