| Human muscle function following prolonged eccentric exercise. | |
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MedLine Citation:
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PMID: 3678226 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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4 subjects performed repeated eccentric contractions with leg extensors during prolonged downhill walking (-25% gradient) at 6.44 km.h-1 until collapse due to muscle weakness (range of exercise duration 29 to 40 min). During the exercise oxygen uptake rose progressively from approximately 45% of the previously determined VO2max at 10 min to approximately 65% at the end of the exercise. Following the exercise there was an immediate, significant, and sustained reduction in maximal voluntary isometric contraction, and short term (anaerobic) power output measured concentrically on an isokinetic ergometer. These reductions in muscle function persisted for 96 hours post exercise, and were reflected by significant reductions in the tension generated at low frequency (20 Hz) relative to higher frequency (50 Hz) percutaneous stimulation of the quadriceps. All four subjects showed an increase in plasma levels of creatine kinase post eccentric exercise. Performing concentric contractions by walking uphill for one hour at a significantly greater metabolic cost failed to induce comparable reductions in muscle function. These results provide evidence for the consequences of prolonged eccentric work upon dynamic function which complements earlier reports of structural, enzymatic, and static function changes. |
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Authors:
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A J Sargeant; P Dolan |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: European journal of applied physiology and occupational physiology Volume: 56 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1987 |
Date Detail:
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Created Date: 1988-01-12 Completed Date: 1988-01-12 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 704-11 Citation Subset: IM; S |
Affiliation:
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Department of Exercise Physiology and Health Sciences, Faculty of Human Movement Sciences, Free University, Amsterdam, The Netherlands. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobiosis Bicycling Creatine Kinase / blood Electric Stimulation Female Humans Isometric Contraction Male Muscle Contraction Muscles / physiology* Oxygen Consumption Physical Exertion* |
| Chemical | |
Reg. No./Substance:
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EC 2.7.3.2/Creatine Kinase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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