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http://hdl.handle.net/11375/22502
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DC Field | Value | Language |
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dc.contributor.advisor | Riach, Cindy | - |
dc.contributor.author | Portfors, Christine | - |
dc.date.accessioned | 2018-01-16T20:26:06Z | - |
dc.date.available | 2018-01-16T20:26:06Z | - |
dc.date.issued | 1992-07 | - |
dc.identifier.uri | http://hdl.handle.net/11375/22502 | - |
dc.description.abstract | <p> Centre of pressure (CP) excursion frequency characteristics of normal and visually impaired children were examined. Thirty-six normal (N) children and 12 visually impaired (VI) children stood on a force platform under 4 conditions (eyes open or closed, normal or foam surface). CP excursions were analyzed by fast Fourier transformation. Total power was calculated between 0-4 Hz, and percent of total power was calculated in the low (0-1 Hz) and high (1-4 Hz) bands. Linear regression was performed on logarithmically transformed data and the slope was used to compare the relative power at low and high frequencies. Analysis of covariance removed the variance due to height in the N children. The Mann-Whitney test compared theN and VI children. Total power decreased with age. Young children (4-7 years) had more high frequency power. Young children may respond intermittently to feedback with ballistic type movements while older children may continuously monitor and respond to sensory feedback. Vision helped control CP adjustments, but power did not increase between 0-1 Hz with eyes closed. VI had higher total power on the normal surface. With eyes closed the differences were more obvious in the older children (10-12 years) which suggests vision is important in development to fine-tune the sensory systems. The foam reduced pressor receptor feedback, reducing the advantage of more finely tuned somatosense in N children. VI children had more low frequency power than N children (A-P). Young VI children did not have a large amount of high frequency power, as the N children did, suggesting that VI children may adapt at a younger age to continuously monitor and respond to feedback without relying on intermittent ballistic type responses. </p> | en_US |
dc.language.iso | en | en_US |
dc.subject | frequency characteristics | en_US |
dc.subject | postural control | en_US |
dc.subject | visually impaired | en_US |
dc.subject | children | en_US |
dc.title | Frequency Characteristics of Postural Control of Normal and Visually Impaired Children | en_US |
dc.contributor.department | Human Biodynamics | en_US |
dc.description.degreetype | Thesis | en_US |
dc.description.degree | Master of Science (MSc) | en_US |
Appears in Collections: | Digitized Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Portfors_Christine_V_1992July_Masters.pdf | 3.34 MB | Adobe PDF | View/Open |
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