Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adults

• Published in: European journal of applied physiology Vol. 95; no. 5-6; pp. 436 - 446
• Main Authors: Manini, Todd M, Clark, Brian C, Tracy, Brian L, Burke, Jeanmarie, Ploutz-Snyder, Lori
• Format: Journal Article
• Language: English
• Published: Germany Springer Nature B.V 01-12-2005
• Subjects: 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; Muscular system; Older people; Physical Education and Training - methods; Postural Balance - physiology
• ISSN: 1439-6319; 1439-6327
• DOI: 10.1007/s00421-005-0048-x

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.