The effect of a course of perceptual-motor exercises on ground reaction force components in mentally retarded children during walking

Ashayeri, Somayeh (2020) The effect of a course of perceptual-motor exercises on ground reaction force components in mentally retarded children during walking. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: The aim of this study was to investigate the effect of perceptual- motor exercises on the frequency spectrum of ground reaction forces in mentally retarded children during walking. Research method: In this semi-experimental study, sixteen female mentally retarded students, were trained perceptual- motor exercises for eight weeks and three sessions per week. Before and after the exercises, ground reaction force variables were measured using a force plate device. Paired t-test at the significance level of 0.05 was used for statistical analysis. Findings: perceptual-motor exercises reduced the values of frequency with a power of 99.5% (p= 0.007; d=0.49) and number of essential harmonies (p= 0.002; d=0.63) in vertical direction significantly at the post-test compared to the pre-test. mid frequency and bandwidth of frequency were not affected by perceptual-motor exercises (P > 0.05). The peak values of ground reaction force components in vertical direction increased and dcreased significantly at heel contact (p = 0.027) and push off (p = 0.017) respectively and decreased in anterior-posterior direction (p = 0.002) at heel contact. The time to reach the peak in the vertical direction, had a significantly increased at mid stance (p = 0.043) and push off (p = 0.028), and loading rate decreased significantly (p = 0.002). Conclusion: The perceptual-motor exercises used in this study can reduce lower limb injury and improve walking quality in mentally retarded children.

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