Document Detail

Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adults.
MedLine Citation:
PMID:  16193338     Owner:  NLM     Status:  MEDLINE    
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.
Todd M Manini; Brian C Clark; Brian L Tracy; Jeanmarie Burke; Lori Ploutz-Snyder
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2005-09-29
Journal Detail:
Title:  European journal of applied physiology     Volume:  95     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-05     Completed Date:  2006-03-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  436-46     Citation Subset:  IM    
Musculoskeletal Research Laboratory, Syracuse University, Syracuse, NY, USA.
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MeSH Terms
Activities of Daily Living
Aged, 80 and over
Exercise / physiology*
Frail Elderly*
Isometric Contraction
Knee Joint / physiology*
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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