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Reliability of COP-based postural sway measures and age-related differences
Dingding Lina, Hyang Seola, Maury A. Nussbauma , Michael L. Madiganb
Received 15 March 2007; received in revised form 17 January 2008; accepted 19 January 2008. published online 04 March 2008.
Corrected Proof
Abstract
The objectives of this study were to assess the within-day and between-day reliability of several center of pressure (COP)-based measures of postural sway and identify whether there were age-related differences in reliability. Thirty-two healthy individuals (16 younger and 16 older) participated. COP was recorded during quiet upright stance on 4 different days, and a variety of measures determined: mean velocity, median power frequency, RMS distance, sway area, and two fractal measures derived from Hurst rescaled range analysis (HR/S) and detrended fluctuation analysis (DFA). Intraclass correlation coefficient (ICC) and standard error of measurement (SEM) were used to quantify reliability. Mean velocity was the most reliable measure. DFA exponents had relatively better reliability than HR/S exponents. In general, within-day reliability was better than between-day. In comparison with younger participants, older participants exhibited better relative reliability (ICC) for all COP measures and comparable absolute reliability (SEM) except for mean velocity and sway area. These results may be useful in guiding the future selection and interpretation of COP-based measures.
Keywords: Center of pressure, Aging, Postural control, Reliability
a Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, VA, USA
b Department of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA, USA
Corresponding author at: Department of Industrial and Systems Engineering, Virginia Tech, 250 Durham Hall (0118), Blacksburg, VA 24061, USA. Tel.: +1 540 231 6053; fax: +1 540 231 3322.
PII: S0966-6362(08)00030-1
doi:10.1016/j.gaitpost.2008.01.005
© 2008 Elsevier B.V. All rights reserved.
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