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Abstract

Measures of human sway during upright standing are frequently used as indirect measures of the postural control system. The objective of this study was to assess the reliability of several center-of-pressure-based sway measures. Test-retest reliability was determined both within-days (under different visual and surface conditions) and between-days (5 different days). Intraclass Correlation Coefficient (ICC), Standard Error of Measurement (SEM), Minimal Metrically Detectable Change (MMDC), and Coefficient of Variation (CV) were used as reliability indices. Mean velocity was found to be the most reliable measure among those evaluated. Overall, between-day reliability indices were better than within-day reliability. When subjects were standing on a compliant surface, several measures exhibited better reliability under ‘eyes open’ condition. These results can be useful in guiding the selection of postural sway measures and appropriate number of replications to improve sway assessment.

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References

Baratto

Morasso

P.G.

Spida

(2002). A new look at posturographic analysis in the clinical context: Sway-density versus other parameterization techniques. Motor Control, 6, 246–270.

Benvenuti

Mecacci

Gineprari

Bandinelli

Benvenuti

Ferrucci

Baroni

Rabufetti

Hallett

Dambrosia

J.M.

Stanhope

S.J.

(1999). Kinematic characteristics of standing disequilibrium: Reliability and validity of posturographic protocol. Archives of Physical Medicine and Rehabilitation, 80, 278–287.

Bruton

Conway

J.H.

Holgate

S.T.

(2000) Reliability: What is it, and how is it measured? Physiotherapy, 86, 94–99.

Cincchetti

D.V.

Sparrow

S.S.

(1981). Developing criteria for establishing Interrater reliability of specific items: Application to assessment of adaptive behavior. American Journal of Mental Deficiency, 86, 127–137.

Collins

J.J.

De Luca

C.J.

Burrows

Lipsitz

L.A.

(1995). Age-related changes in open-loop and closed-loop postural control mechanisms. Experimental Brain Research, 104, 480–492.

Cornilleau-Pérès

Shabana

Droulez

Goh

J.C.H.

Lee

G.S.M.

Chew

P.T.K.

(2005). Measurement of the visual contribution to postural steadiness from the COP movement: Methodology and reliability. Gait & Posture, 22, 96–106.

Corriveau

Hébert

Prince

Raiche

(2000). Intrasession reliability of the “center of pressure minus center of mass” variable of postural control in the healthy elderly. Archives of Physical Medicine and Rehabilitation, 81, 45–48.

Duarte

Zatsiorsky

V.M.

(2000). On the fractal properties of natural human standing. Neuroscience Letters, 283, 173–176.

Hasan

S.S.

Robin

D.W.

Szurkus

D.C.

Ashmead

D.H.

Peterson

S.W.

Shiavi

R.G.

(1996). Simultaneous measurement of body center of pressure and center of gravity during upright stance. Part II: Amplitude and frequency data. Gait & Posture, 4, 11–20.

10.

Henriksen

Lund

Moe-Nilssen

Bliddal

Danneskiod-Samsoe

(2004). Test-retest reliability of trunk accelerometric gait analysis. Gait Posture, 19, 288–297.

11.

Lafond

Corriveau

Hébert

Prince

Raiche

(2004). Intrasession reliability of the center of pressure measures of postural steadiness in healthy elderly people. Archives of Physical Medicine and Rehabilitation, 85, 896–901.

12.

Lafond

(2006) Reliability of center of pressure measures of postural steadiness [letter]. Archives of Physical Medicine and Rehabilitation, 87, 308.

13.

Norris

J.A.

Marsh

A.P.

Smith

I.J.

Kohut

R.I.

Miller

M.E.

(2005). Ability of static and statistical mechanics posturographic measures to distinguish between age and fall risk. Journal of Biomechanics, 38, 1263–1272.

14.

Prieto

T.E.

Myklebust

J.B.

Hoffmann

R.G.

Lovett

E.G.

Myklebust

B.M.

(1996). Measures of postural steadiness: Differences between healthy young and elderly adults. IEEE Transactions on Biomedical Engineering, 43, 956–966.

15.

Raymakers

J.A.

Samson

M.M.

Verhaar

H.J.J.

(2005). The assessment of body sway and the choice of stability parameter(s). Gait and Posture, 21, 48–58.

16.

Redfern

M.S.

Moore

P.L.

Yarsky

C.M.

(1997). The influence of flooring on standing balance among older persons. American Journal of Hygiene Association Journal, 61, 700–708.

17.

Samson

Crowe

(1996). Intra-subject inconsistencies in quantitative assessment of body sway. Gait and Posture, 4, 252–257.

18.

Shrout

P.E.

Fleiss

J.L.

(1979). Intraclass correlation: Uses in assessing rater reliability. Psycological Bulletin, 86, 420–428.

19.

Simeonov

Hsiao

(2001). Height, surface firmness, and visual reference effects on balance control. Injury Prevention, 7 (Suppl 1), i50–53.

20.

Stratford

P.W.

Goldsmith

C.H.

(1997). Use of the standard error as a reliability index of interest: An applied example using elbow flexor strength data. Physical Therapy, 77, 745–750.

21.

Winter

D.A.

(1995). Human balance and posture control during standing and walking. Gait and Posture, 3, 193–214.

Reliability of Cop-Based Postural Sway Measures

Abstract

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