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Oud-Heverlee, Belgium

Bar-On L.,University Hospital | Aertbelien E.,Celestijnenlaan 300b | Wambacq H.,Celestijnenlaan 300b | Severijns D.,University Hospital | And 9 more authors.
Gait and Posture | Year: 2013

Most clinical tools for measuring spasticity, such as the Modified Ashworth Scale (MAS) and the Modified Tardieu Scale (MTS), are not sufficiently accurate or reliable. This study investigated the clinimetric properties of an instrumented spasticity assessment. Twenty-eight children with spastic cerebral palsy (CP) and 10 typically developing (TD) children were included. Six of the children with CP were retested to evaluate reliability. To quantify spasticity in the gastrocnemius (GAS) and medial hamstrings (MEH), three synchronized signals were collected and integrated: surface electromyography (sEMG); joint-angle characteristics; and torque. Muscles were manually stretched at low velocity (LV) and high velocity (HV). Spasticity parameters were extracted from the change in sEMG and in torque between LV and HV. Reliability was determined with intraclass-correlation coefficients and the standard error of measurement; validity by assessing group differences and correlating spasticity parameters with the MAS and MTS. Reliability was moderately high for both muscles. Spasticity parameters in both muscles were higher in children with CP than in TD children, showed moderate correlation with the MAS for both muscles and good correlation to the MTS for the MEH. Spasticity assessment based on multidimensional signals therefore provides reliable and clinically relevant measures of spasticity. Moreover, the moderate correlations of the MAS and MTS with the objective parameters further stress the added value of the instrumented measurements to detect and investigate spasticity, especially for the GAS. © 2012 Elsevier B.V. Source


Van Genechten B.,Celestijnenlaan 300b | Vandepitte D.,Celestijnenlaan 300b | Desmet W.,Celestijnenlaan 300b
Computer Methods in Applied Mechanics and Engineering | Year: 2011

This paper presents a newly developed hybrid simulation technique for coupled structural-acoustic analysis, which applies a wave based model for the acoustic cavity and a direct or modally reduced Finite Element model for the structural part. The resulting hybrid model benefits from the computational efficiency of the wave based method, while retaining the Finite Element Method's ability to model the structural part of the problem in great detail. Application of this approach to the analysis of three fully coupled vibro-acoustic problems with an increasing modelling complexity shows the improved computational efficiency as compared to classical Finite Element procedures and illustrates the potential of the hybrid method as a powerful tool for the analysis of coupled structural-acoustic systems in the low- and mid-frequency range. © 2010 Elsevier B.V. Source

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