Erschienen in:
01.12.2005 | Original Articel
Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adults
verfasst von:
Todd M. Manini, Brian C. Clark, Brian L. Tracy, Jeanmarie Burke, Lori Ploutz-Snyder
Erschienen in:
European Journal of Applied Physiology
|
Ausgabe 5-6/2005
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Abstract
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.