| Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adults. | |
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MedLine Citation:
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PMID: 16193338 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to determine the effect of task-specificity on knee extensor steadiness adaptations in functionally limited older adults. Twenty-four functionally limited older adults (74.6+/-7.6 years: 22 women, 2 men) completed a 10-week control period followed by 10 weeks (2 days/week) of resistance (RT), functional (FT) (practicing everyday tasks, i.e., chair rises) or functional + resistance (FRT) training, which featured both shortening and lengthening movements. During testing, subjects performed a steady isometric [10, 25, 50% of maximal voluntary contraction (MVC)] and shortening/lengthening (5, 30, 65% of MVC) knee extensor contractions. There were no steadiness (isometric, shortening or lengthening contractions) changes in the control period and no adaptations in isometric steadiness due to training. RT induced a 37% reduction in shortening fluctuations at 5% of MVC and 35% reduction in lengthening fluctuations at both 30% and 65% of MVC. FRT induced a 60% reduction in shortening fluctuations at 30% of MVC. No adaptations in dynamic steadiness were observed in the FT group. Further analysis indicated that those who were the least steady at baseline showed the greatest training effects during isometric (RT: R (2)=0.25, FRT: R (2)=0.49, FT: R (2)=0.38), shortening (RT: R (2)=0.36, FRT: R (2)=0.36, FT: R (2)=0.35) and lengthening (RT: r (2)=0.29, FRT: r (2)=0.44) contractions. In conclusion, steadiness improvements in groups performing resistance exercise, without a concomitant improvement in the FT group, supports a role for task-specificity in explaining steadiness adaptations, particularly for unsteady older adults. |
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Authors:
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Todd M Manini; Brian C Clark; Brian L Tracy; Jeanmarie Burke; Lori Ploutz-Snyder |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't Date: 2005-09-29 |
Journal Detail:
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Title: European journal of applied physiology Volume: 95 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2005 Dec |
Date Detail:
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Created Date: 2005-12-05 Completed Date: 2006-03-29 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 436-46 Citation Subset: IM |
Affiliation:
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Musculoskeletal Research Laboratory, Syracuse University, Syracuse, NY, USA. maninit@mail.nih.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Activities of Daily Living Aged Aged, 80 and over Exercise / physiology* Female Frail Elderly* Humans Isometric Contraction Knee Joint / physiology* Male Middle Aged Muscle, Skeletal / physiology* Physical Education and Training / methods* Postural Balance / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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