<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Damien Callahan</style></author><author><style face="normal" font="default" size="100%">Edward Phillips</style></author><author><style face="normal" font="default" size="100%">Robert Carabello</style></author><author><style face="normal" font="default" size="100%">Walter R Frontera</style></author><author><style face="normal" font="default" size="100%">Roger A Fielding</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Assessment of lower extremity muscle power in functionally-limited elders</style></title><secondary-title><style face="normal" font="default" size="100%">Aging Clinical and Experimental Research</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Aged</style></keyword><keyword><style  face="normal" font="default" size="100%">Female</style></keyword><keyword><style  face="normal" font="default" size="100%">Hip</style></keyword><keyword><style  face="normal" font="default" size="100%">Humans</style></keyword><keyword><style  face="normal" font="default" size="100%">Knee</style></keyword><keyword><style  face="normal" font="default" size="100%">Leg</style></keyword><keyword><style  face="normal" font="default" size="100%">Male</style></keyword><keyword><style  face="normal" font="default" size="100%">Muscle Strength</style></keyword><keyword><style  face="normal" font="default" size="100%">{Cross-Sectional} Studies</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/17607086</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">3</style></number><volume><style face="normal" font="default" size="100%">19</style></volume><pages><style face="normal" font="default" size="100%">194–199</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">BACKGROUND The purpose of this study was to assess the reliability and concurrent validity of a new methodology to evaluate lower extremity muscle power in older, functionally limited men and women.
METHODS A cross sectional evaluation was performed on 58 older men (n=27) and women (n=31) (74.2+/-0.9 years). Knee and hip (leg press) and knee extensor power were evaluated on pneumatic and isokinetic resistance equipment. Incremental single attempt power {(IP)} testing utilized a single attempt at attaining maximum power at each of six external resistances and was compared to multiple attempt pneumatic power {(MP)} testing determined by the highest of 5 attempts at achieving maximum power at two set resistances and also with power determined by isokinetic dynamometry.
RESULTS Leg press extension {MP} yielded significantly greater power than {IP} at both low (mean=225.3+/-11.85 and 183.9+/-11.52 watts respectively, p&amp;lt;0.001) and high (mean=249.7+/-15.25 and 201.7+/-13.18 watts respectively, p&amp;lt;0.001) external resistances. Knee extension {MP} also produced significantly greater power when compared to {IP} at low (mean=82.4+/-4.45 and 69.7+/-4.28 watts respectively, p&amp;lt;0.001) and high (mean=93.7+/-6.3 and 83.2+/-5.93 watts respectively, p&amp;lt;0.001) external resistances. {MP} testing exhibited excellent reliability at both low (leg press extension: Intra Class Correlation {(ICC)=0.93,} knee extension: {ICC=0.87)} and high {(Leg} press extension: {ICC=0.85,} Knee Extension: {ICC=0.91)} external resistances. {MP} knee extension at 70% 1 {RM} also showed good agreement with average isokinetic power (R2=0.636).
CONCLUSIONS These findings support the reliability and concurrent validity of {MP} for the evaluation of muscle power in older individuals.</style></abstract><notes><style face="normal" font="default" size="100%">{PMID:} 17607086</style></notes></record></records></xml>