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Postural control in the elderly: an analysis of test-retest and interrater reliability of the COP-COM variable.

Abstract：

OBJECTIVES:To estimate the test-retest and interrater reliability of the center of pressure-center of mass (COP-COM) variable of postural control in the elderly. DESIGN:The biomechanic variable COP-COM, which represents the distance between the COP and the COM, was determined from 2 AMTI force platforms and 3 OPTOTRAK position sensors. Measurements were taken in quiet position, double leg stance, and eyes open and eyes closed conditions. SETTING:Laboratory environment. PARTICIPANTS:Forty-five healthy subjects, 8 patients with diabetes neuropathy, and 7 stroke survivors, all of whom were at least 60 years old. INTERVENTIONS:Subjects were evaluated on 2 separate occasions within 7 days by the same evaluator to determine test-retest reliability. Interrater reliability was determined the same day. MAIN OUTCOME MEASURES:The biomechanic variable COP-COM, which represents the distance between the COP and the COM in terms of root mean square. The mean of 4 trials of the COP-COM variable for each condition was used for statistical analysis. Intraclass correlation coefficients (ICCs) were used. RESULTS:The COP-COM variable has good reliability for both the test-retest and interrater studies, but its reliability varies according to the direction of the COP-COM. For the test-retest and interrater studies, the ICC ranged from.89 to.93 in the anteroposterior direction and from.74 to.79 in the mediolateral direction. CONCLUSION:The equivalence of the test-retest and interrater coefficients obtained suggests that the measurement error of the COP-COM variable is mainly linked to the biologic variability of this measure over a short period of time. Using the mean of 4 trials stabilizes the COP-COM variable enough to be potentially used to evaluate clinical change.

journal_name

Arch Phys Med Rehabil

journal_title

Archives of physical medicine and rehabilitation

authors

Corriveau H,Hébert R,Prince F,Raîche M

doi

10.1053/apmr.2001.18678

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

80-5

issue

1

eissn

0003-9993

issn

1532-821X

pii

S0003-9993(01)53407-3

journal_volume

82

pub_type

杂志文章

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