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The postural sway of 76 healthy young children aged from two to 14 years was investigated to identify age-related changes in the extent of sway, the effects of eye-closure, and the spectral composition of sway. Postural sway was measured from the excursions of the centre of pressure of ground reaction forces, and was analysed for both time and frequency.(More)
Postural responses, triggered by sensory feedback, are present very early in a child's development. The purpose of the present study was to investigate the ability of children to anticipate postural disturbances caused by self-initiated movements and their ability to coordinate anticipatory postural adjustments with movement execution. Children (N = 32)(More)
Adults are able to use a visual target to reduce quiet-standing postural sway (Lee & Lishman, 1975). The present study was designed to determine whether children, under varying postural conditions, are also able to use a visual target to reduce postural sway. A second purpose was to determine the ability of children to visually fixate under different(More)
This study was designed to investigate the biomechanics of anticipatory postural responses. In particular the aim was to determine whether the centre of pressure of ground reaction forces moves in anticipation of an expected upper limb movement, and if so to determine the pattern (s) of centre of pressure change in normal subjects, and patients with(More)
During quiet standing on a force platform, centre of pressure frequency characteristics of normal and visually impaired children were investigated under four conditions: normal surface, eyes open and closed; foam surface, eyes open and closed. Total power was calculated between 0 and 4Hz. Slopes of logarithmically transformed data were used to compare(More)
The purpose of this study was to investigate the roles of specific muscles in supporting the elbow joint in full extension during a static weighted situation. Various forearm positions from pronation through supination were used to determine carrying efficiency by monitoring muscle activity. Fine-wire electrodes were inserted into the biceps brachii,(More)
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