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J Am Geriatr Soc. 2004 Jun;52(6):977-82.

Isokinetic leg muscle strength in older americans and its relationship to a standardized walk test: data from the national health and nutrition examination survey 1999-2000.

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Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland 20782, USA.



To describe isokinetic knee extensor muscle strength in older U.S. men and women by age and race/ethnicity and to ascertain its relationship to a standard, timed walking-speed test.


The U.S. National Health and Nutrition Examination Survey (NHANES) 1999-2000.


A cross-sectional nationally representative health examination survey.


All surveyed persons aged 50 and older (N=1,499) who performed muscle strength and timed walk examinations in the NHANES mobile examination center.


Concentric peak torque (strength) of the knee extensors at 1.05 rads/ s(-1) velocity and a 6-m walk timed in seconds.


Knee extensor strength was inversely associated with age (P<.01), and women had less knee extensor muscle strength than men (P<.01). After adjustment for standing height, no significant difference in muscle strength was found across the three race/ethnicity groups (Mexican Americans, non-Hispanic blacks, and non-Hispanic whites) for men or women. After adjustment for age, race/ethnicity, weight, and height, increasing knee extensor strength was associated with significant increases in meters walked per second (P<.01).


Knee extensor muscle strength is affected by age and sex but not by race/ethnicity and it is significantly associated with timed walk.

[Indexed for MEDLINE]

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