| Cellular adaptation to repeated eccentric exercise-induced muscle damage. | |
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MedLine Citation:
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PMID: 11568149 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Eccentrically biased exercise results in skeletal muscle damage and stimulates adaptations in muscle, whereby indexes of damage are attenuated when the exercise is repeated. We hypothesized that changes in ultrastructural damage, inflammatory cell infiltration, and markers of proteolysis in skeletal muscle would come about as a result of repeated eccentric exercise and that gender may affect this adaptive response. Untrained male (n = 8) and female (n = 8) subjects performed two bouts (bout 1 and bout 2), separated by 5.5 wk, of 36 repetitions of unilateral, eccentric leg press and 100 repetitions of unilateral, eccentric knee extension exercises (at 120% of their concentric single repetition maximum), the subjects' contralateral nonexercised leg served as a control (rest). Biopsies were taken from the vastus lateralis from each leg 24 h postexercise. After bout 2, the postexercise force deficit and the rise in serum creatine kinase (CK) activity were attenuated. Women had lower serum CK activity compared with men at all times (P < 0.05), but there were no gender differences in the relative magnitude of the force deficit. Muscle Z-disk streaming, quantified by using light microscopy, was elevated vs. rest only after bout 1 (P < 0.05), with no gender difference. Muscle neutrophil counts were significantly greater in women 24 h after bout 2 vs. rest and bout 1 (P < 0.05) but were unchanged in men. Muscle macrophages were elevated in men and women after bout 1 and bout 2 (P < 0.05). Muscle protein content of the regulatory calpain subunit remained unchanged whereas ubiquitin-conjugated protein content was increased after both bouts (P < 0.05), with a greater increase after bout 2. We conclude that adaptations to eccentric exercise are associated with attenuated serum CK activity and, potentially, an increase in the activity of the ubiquitin proteosome proteolytic pathway. |
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Authors:
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N Stupka; M A Tarnopolsky; N J Yardley; S M Phillips |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 91 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2001 Oct |
Date Detail:
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Created Date: 2001-09-24 Completed Date: 2001-12-04 Revised Date: 2006-11-15 |
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: 1669-78 Citation Subset: IM; S |
Affiliation:
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Department of Kinesiology, Exercise Metabolism Research Group, McMaster University, Hamilton, Ontario, Canada L8S 4K1. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology Adult Blotting, Western Creatine Kinase / blood Exercise / physiology* Female Humans Immunohistochemistry Inflammation / pathology Macrophages / pathology Male Muscle, Skeletal / cytology*, pathology, physiology* Neutrophil Infiltration / physiology Sex Characteristics Ubiquitin / metabolism Weight Lifting |
| Chemical | |
Reg. No./Substance:
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0/Ubiquitin; EC 2.7.3.2/Creatine Kinase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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