Influence of vestibulo-ocular and oculo-motor functions on motor performance of school-aged children with development coordination disorders : a pilot study

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Influence of vestibulo-ocular and oculo-motor functions on motor performance of school-aged children with development coordination disorders : a pilot study

 

Author: Fan, Wing-nga Olivia
Title: Influence of vestibulo-ocular and oculo-motor functions on motor performance of school-aged children with development coordination disorders : a pilot study
Degree: M.Sc.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Psychomotor disorders in children
Children with perceptual disabilities
Eye-hand coordination
Department: Dept. of Rehabilitation Sciences
Pages: xii, 106 leaves : ill. ; 31 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2356222
URI: http://theses.lib.polyu.edu.hk/handle/200/5821
Abstract: Purpose: This study aims to investigate the influence of the vestibulo-ocular and oculo-motor functions on motor performance of school-aged children with developmental coordination disorders (DCD). Methods: This study was a cross-sectional study. 18 children of DCD (mean age 8y 9 mo; 10 males and 8 females) and 19 Typically Developing (TD) children (mean age 7 y 8 mo; 13 males and 6 females) were recruited by convenient sampling. Three instrumentations were adopted in current study. The Bruininks-Osevetskey Test of Motor Proficiency Second Edition (BOT-2) was used to test the clinical motor skills of both groups of children. The videonystagmography (VNG) was used to examine the vestibulo-ocular and oculo-motor functions. Participants put on a goggle with high speed video camera installed and real-time eye movements were captured and analysed. The third instrument was the Computerized Dynamic Visual Acuity Test (CDVAT). It is a clinical outcome measure used to evaluate the vestibulo-ocular reflex (VOR), which is responsible for gaze stabilization by generating compensatory eye movements in response to head rotation. Results: BOT-2 showed that children with DCD had poorer motor skills in terms of bilateral coordination, balance, upper limb coordination, running speed and agility and also strength. Among 6 subtests of VNG, nine significant differences were detected in 3 subtests (p value < 0.05). The children with DCD had significantly lower saccadic velocity. Secondly, they had lower smooth pursuit gain (at 2 Hz). They also had lower smooth pursuit velocity. Thirdly. children with DCD had lower optokinetic gain. Fourthly, 5 children of DCD were dctected to have bilateral vestibular dysfunction and 1 child of DCD was detected to have unilateral vestibular dysfunction by the caloric test. This represent 33% of DCD group. Furthermore, a positive correlation was found between the upper limb coordination (ball skills) and optokinetic gain in children with DCD. Finally, children of DCD had significantly lower dynamic visual acuity (DVA) score when compared to baseline score but this was not observed in TD children. This might imply VOR dysfunction. Moreover, children with DCD had lower visual acuity score even at baseline condition (head not moved), which might also imply the potential deficit in visual processing. Conclusion: Results of study suggests children with DCD has deficits in oculo-motor and vestibule-ocular function and influence some of their motor performance (in particular upper limb coordination). Corresponding training should be considered for children with DCD which might have influence on the upper limb coordination skills. CDVAT was shown to be effective and easily-accessible as a screening tool for children with DCD in future practice. The caloric test should be considered as one of the testing battery for children who suffered from balance problems and did not respond to conservative physiotherapeutic intervention.

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