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J Am Geriatr Soc. 2006 May;54(5):737-42.

Performance-based measures of physical function for high-function populations.

Author information

1
Pacific Health Research Institute, 846 South Hotel Street, Honolulu, HI 96813, USA. jdcurb@phrihawaii.org

Abstract

OBJECTIVES:

To improve and broaden the applicability of performance-based measures of function for use in clinical and research settings.

DESIGN:

Cross-sectional repeated-measures study.

SETTING:

Research clinic.

PARTICIPANTS:

Population-based sample of Japanese Americans without significant functional impairments aged 35 to 55 and 56 to 71 (N=203).

MEASUREMENTS:

Performance-based measures of physical function, including range of standard tests, newer automated measures of balance and strength and data on cognitive function, lifestyle, medical history, and physical activity.

RESULTS:

Of the nonplatform balance measures, only the one-leg stand was reliable (reliability coefficient (rc) =0.69) and able to discriminate between functional levels. Combining the Fourth National Health and Nutrition Examination Survey protocol of folded arm position while standing on a foam pad with the more-sophisticated balance platform test had the highest reliability and discrimination. With the strength chair, high rcs (0.88-0.96) were found for upper and lower extremity tests. Timed chair stands, a test of lower extremity and central strength were reliable. The 6-minute walk had a high rc (0.90).

CONCLUSION:

Many performance tests used today are not reliable. Only a few discriminate between the most highly functioning individuals and individuals with good function. Thus, a new recommended battery includes unassisted single-leg stand, balance platform "foam pad, eyes closed," elbow flexion and knee extension strength (strength chair), grip strength, timed chair stands, and the 6-minute walk. These simple performance-based tests have good reliability and discrimination across the range of function and can be used in most clinical and research settings to quickly assess global functional level.

[Indexed for MEDLINE]

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