The Effect of Balance Task Difficulty and Visual Feedback on EMG Activity of Selected Muscles in Elderly Women

Document Type : علمی- پژوهشی

Authors

1 Shahid Beheshti university

2 Faculty of Sports and Health Sciences, Shahid Beheshti University, Tehran, Iran.

Abstract

Background: The purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on EMG activity of selected muscles in elderly women. Materials and Method: Fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. The task consisted of performing balance task on Biodex Balance System. Participants were asked to stand still on a stability platform under each of two conditions (with visual feedback and without visual feedback) in three levels of difficulty (6, 8 &10). Megawin EMG system was used for recording electromyography of gastrocnemius, rectus femoris, preroneus longus and biceps femoris muscles and RMS of signals was obtained. Duration of each test was 20 seconds and rest times were 20 seconds. Results: Results showed that with increasing task difficulty, preroneus longus (p= 0/01), biceps femoris (p= 0/028), rectus femoris (p < 0/001) and gastrocnemius (p= 0/01) EMG activity increased significantly. In addition, There was a significant increase in preroneus longus (p= 0/01), biceps femoris (p < 0/001) and rectus femoris (p < 0/001) EMG activity in visual feedback condition compared with without feedback condition. Conclusion: the results of this study showed that increasing task difficulty and visual feedback increases EMG activity of muscles

Keywords


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