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Citation |
Zemkova E, Hamar D. Sport Sci. 2009; 2(2): 41-46. |
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Affiliation |
Faculty of Physical Education and Sport, Comenius University, Bratislava, Slovakia |
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Copyright |
(Copyright © 2009, Physical Education Pedagogues Association) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
The study compares the accuracy of visual feedback control of COP movement in antero-posterior and medio-lateral direction during task-oriented sensorimotor exercise in various populations. Individuals of different age and performance level (groups of healthy young adults – students of technical university, older women, and elite dancers), athletes of various specializations (competitors of snowboarding, windsurfing, cycling, rowing, canoeing, karate, and PE students), and athletes after lower limb injury (ankle, knee) volunteered to participate in the study. Subjects were provided by feedback on COM displacement on a computer screen while standing on dynamometric platform. Their task was to trace, by shifting COM, a curve flowing either in vertical or horizontal direction. The test consisted of three 30-seconds trials randomly performing in each direction. The deviation of instant COP position from the curve was recorded at 100 Hz by means of the system FiTRO Sway Check. Results showed that mean COP distance from horizontally and vertically flowing curves was significantly (p ≤ 0.01) lower in dancers (11.8 ± 2.3 mm and 10.1 ± 2.2 mm, respectively) than in students (14.8 ± 1.9 mm and 13.7 ± 2.0 mm, respectively) and older women (16.4 ± 2.6 mm and 14.5 ± 2.7 mm, respectively). On the other hand, there were no significant differences in the COP distance from both curves in competitors of snowboarding and windsurfing (20.7 ± 2.2 mm and 20.1 ± 2.2 mm, respectively), karate (20.8 ± 2.7 mm and 20.3 ± 2.7 mm, respectively), PE students (21.5 ± 3.0 mm and 20.6 ± 2.6 mm, respectively), cyclists (22.6 ± 3.0 mm and 21.3 ± 2.7 mm, respectively), and rowers (23.0 ± 2.8 mm and 22.5 ± 2.2 mm, respectively). As in previous groups, there were no significant differences in mean COP distance from horizontally and vertically flowing curve in athletes after lower limb injury while performing the task on both legs (28.7 ± 2.5 mm and 27.0 ± 2.1 mm, respectively) and on non- injured leg (42.6 ± 4.6 mm and 33.3 ± 4.2 mm, respectively). However, its values were significantly (p ≤ 0.05) higher in antero-posterior than in medio-lateral direction while standing on injured leg (50.8 ± 5.0 mm and 33.6 ± 4.5 mm, respectively). It may be concluded that the task-oriented test based on visual feedback control of body position can be applied for an evaluation of sensorimotor performance in subjects of different age and expertise, as well as in individuals after lower limb injury. |