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http://dx.doi.org/10.21598/JKPNFA.2018.16.3.433

The Effect of Visual Deprivation on Trunk and Lower Extremity Muscle Activity on an Unstable Surface  

Han, Jin-Tae (Department of Physical Therapy, Kyungsung University)
Publication Information
PNF and Movement / v.16, no.3, 2018 , pp. 433-439 More about this Journal
Abstract
Purpose: Visual information is one of the most important factors for postural balance. The purpose of this study was to investigate the effect of visual deprivation on the lower extremities and trunk muscle activity on an unstable surface during quiet standing. Methods: Fifteen healthy males from a university population participated in this study. Surface electromyography of the rectus abdominis, the erector spinalis, the vastus femoris oblique, the semitendinosis, the tibialis anterior, and the medial gastrocnemius was measured using EMG equipment (Telemyo 2400, Noraxon, USA). The participants were asked to maintain postural balance on an unstable surface (Balance pad, Airex, USA) for 30 seconds with eyes open and with eyes closed during quiet standing. The Wilcoxon test was used to compare the muscle activity of the lower extremities and the trunk between open and closed eyes on an unstable surface. Results: The muscle activity of the trunk and the lower extremities was increased more with eyes closed than with eyes open on the unstable surface during quiet standing. Conclusion: The findings from this study suggest that visual information could alter lower extremity and trunk muscle activity. Therefore, visual deprivation can be used as a method to improve postural balance.
Keywords
Visual deprivation; Postural balance; Unstable surface;
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