Vaizdinės grįžtamosios informacijos poveikis skirtingo amžiaus moterų pėdos lenkimo ir tiesimo judesių kaitumui ir tikslumui

Visual information is essential in human motor control, and especially in the continuous modulation of isometric force. The gain of visual feedback is, the amount of space used to represent change in force, has shown the affect in both the magnitude and time-dependent properties of variability in the force output. The aim of this research was to establish the infl uence of visual feedback on the accuracy and variability of foot fl exion and extension output of women of different age. The studied subjects were healthy women free of neurological diseases: Group 1 — 15 women (mean age — 70.0 ± 5 years,) and Group 2 — 15 women (mean age — 25.0 ± 5 years). The subjects were tested applying the equipment for testing and rehabilitation of human bones and muscles (Biodex Medical System 3). We tested the right leg with visual feedback and without it. For the establishment of accuracy and variability of isometric contractions we calculated the absolute errors (Magill, 2007) and coeffi cient of variation. The research results showed that maximum voluntary force of foot fl exion was statistically signifi cantly higher (p < 0.001) than foot extension in both groups. The foot extension force was the same in both groups. Group 1 and Group 2 coeffi cients of variability of foot extension output with visual feedback were lower than without it (p < 0.05). Group 1 made absolute errors of foot fl exion and extension output less with visual feedback than without it (p < 0.05). We came to the conclusion that visual feedback improved the accuracy of foot fl exion and extension, and the variability of foot extension was statistically signifi cant in both groups of subjects. Older women demonstrated higher variability and made more mistakes in foot fl exion and extension output than younger women.