Document Type

Article

Publication Date

10-2010

Abstract

Objective

To establish the test-retest reliability of linear and nonlinear measures, including intra- and intersession reliability, when used to analyze the center of pressure (COP) time series during the development of infant sitting postural control in infants with or at risk for cerebral palsy (CP).

Design

Longitudinal study.

Setting

University hospital laboratory.

Participants

Infants with or at risk for CP (N=18; mean age ± SD at entry into the study, 13.7±3.6mo).

Interventions

Not applicable.

Main Outcome Measures

Infant sitting COP data were recorded for 3 trials at each session (2 sessions for each month within 1 week) for 4 consecutive months. The linear COP parameters of the root mean square, the range of sway for both the anterior-posterior and the medial-lateral directions, and the sway path were calculated. In addition, the nonlinear parameters of approximate entropy, Lyapunov exponent (LyE), and the correlation dimension for both directions were also calculated. Intra- and intersession reliability was computed by the intraclass correlation coefficient (ICC).

Results

Regarding nonlinear measures, LyE showed high intra- and intersession ICC values in comparison with all other parameters evaluated. Intrasession and intersession reliability increased overall in the last 2 months of data collection and as sitting posture improved.

Conclusions

Our results suggested that the methodology presented is a reliable way of examining the development of sitting postural control in infants with or at risk for CP, and the reliability results generally parallel values found in sitting postural behavior in typical infants. Therefore, this methodology may be helpful in examining efficacy of therapy protocols directed at advancing sitting postural control in infants with motor developmental delays.

Comments

NOTICE: this is the author’s version of a work that was accepted for publication in Archives of Physical Medicine and Rehabilitation. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Archives of Physical Medicine and Rehabilitation, [Vol 91, Issue 10 (2010)] http://dx.doi.org/10.1016/j.apmr.2010.06.027.

Journal Title

Archives of Physical Medicine and Rehabilitation

Volume

91

Issue

10

First Page

1593

Last Page

1601

Included in

Biomechanics Commons

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