| Resistance exercise-induced fluid shifts: change in active muscle size and plasma volume. | |
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MedLine Citation:
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PMID: 7573553 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to test the hypothesis that the reduction in plasma volume (PV) induced by resistance exercise reflects fluid loss to the extravascular space and subsequently selective increase in cross-sectional area (CSA) of active but not inactive skeletal muscle. We compared changes in active and inactive muscle CSA and PV after barbell squat exercise. Magnetic resonance imaging (MRI) was used to quantify muscle involvement in exercise and to determine CSA of muscle groups or individual muscles [vasti (VS), adductor (Add), hamstring (Ham), and rectus femoris (RF)]. Muscle involvement in exercise was determined using exercise-induced contrast shift in spin-spin relaxation time (T2)-weighted MR images immediately postexercise. Alterations in muscle size were based on the mean CSA of individual slices. Hematocrit, hemoglobin, and Evans blue dye were used to estimate changes in PV. Muscle CSA and PV data were obtained preexercise and immediately postexercise and 15 and 45 min thereafter. A hierarchy of muscle involvement in exercise was found such that VS > Add > Ham > RF, with the Ham and RF showing essentially no involvement. CSA of the VS and Add muscle groups were increased 10 and 5%, respectively, immediately after exercise in each thigh with no changes in Ham and RF CSA. PV was decreased 22% immediately following exercise. The absolute loss of PV was correlated (r2 = 0.75) with absolute increase in muscle CSA immediately postexercise, supporting the notion that increased muscle size after resistance exercise reflects primarily fluid movement from the vascular space into active but not inactive muscle. |
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Authors:
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L L Ploutz-Snyder; V A Convertino; G A Dudley |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The American journal of physiology Volume: 269 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1995 Sep |
Date Detail:
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Created Date: 1995-11-02 Completed Date: 1995-11-02 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: R536-43 Citation Subset: IM; S |
Affiliation:
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Department of Biological Sciences, Ohio University, Athens 45701, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Proteins / analysis Body Fluids / metabolism* Electrolytes / blood Humans Magnetic Resonance Imaging Male Muscles / anatomy & histology, blood supply*, physiology* Physical Exertion* Plasma Volume* Thigh / anatomy & histology |
| Chemical | |
Reg. No./Substance:
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0/Blood Proteins; 0/Electrolytes |
| Investigator | |
Investigator/Affiliation:
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V A Convertino / Brooks AFB, TX; G A Dudley / NASA KSC |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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