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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)
This longitudinal analysis confirmed a non-monotonic pattern of postural control development in children from age 5 to 8 years suggested by previous cross-sectional studies. Postural control was considered in terms of control strategy and its variability operationalized by mean and standard deviation of center of pressure (COP) velocity; and of(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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