| Autor: |
Harbourne, R. T., Deffeyes, J. E., Stuberg, W. A., Kyvelidou, A., Stergiou, N. |
| Předmět: |
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| Zdroj: |
Journal of Sport & Exercise Psychology; Jul2007 Supplement, Vol. 29, pS9-S9, 3/4p |
| Abstrakt: |
A child's development toward functional independence relies upon the ability to orient to the environment and control posture so that exploration can ensue. Inefficient postural control generally precedes the identification of delayed movement milestones in an infant, but standardized developmental tests based on observation do not identify these inefficiencies in early postural control, and therefore early identification of motor problems is often missed. Sitting is the first upright posture controlled by the infant, and postural control in sitting can provide a useful window for future motor development difficulties. Once identified, early intervention can possibly prevent or slow increasing movement problems. The purpose of this study was to determine whether linear or nonlinear variables could discriminate between typically developing infants and infants with motor delays. Using center of pressure (COP) data from a force platform, we calculated both linear (range of COP both medial-lateral and anterior-posterior, sway path, circular area, and elliptical area of COP path) and nonlinear (approximate entropy and Lyapunov exponent in both medial-lateral and anterior-posterior directions) variables from a 10-s independent sitting trial of infants when they were just beginning to sit. Fourteen of the infants were typically developing, and 10 of the infants had suspected developmental delays and were at risk for cerebral palsy. Using the multivariate technique of discriminant analysis, two groups of infants were selected using the linear combination of independent variables that best discriminated between the typical group and delayed groups. When just the linear COP variables were used, the analysis correctly classified only 76% of the cases. When the nonlinear variables were added to the analysis, 96% of the cases were correctly classified into the typical or delayed groups. We conclude that linear measures of the COP in sitting alone are inadequate for identifying postural control deficits in infants who are just beginning to sit. Linear variables measure the quantity of COP movement, but nonlinear variables are able to measure the quality of the COP time series, and add to the discriminating capability of early postural analysis using the COP time series. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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