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Effects of Lumbar Stabilization on the Trunk and Lower Limb Muscle Activity and Velocity of the Center of Pressure During Single Leg Standing  

Cynn, Heon-Seock (Dept. of Physical Therapy, College of Health Science, Yonsei University)
Publication Information
Physical Therapy Korea / v.17, no.4, 2010 , pp. 1-7 More about this Journal
Abstract
The aim of this study was to investigate the effects of lumbar stabilization on both trunk and lower limb muscle activity and center of pressure (COP) in single leg standing. Surface electromyography (EMG) was used to collect muscle activity data, the mean velocity of COP was measured using a force plate, and a pressure biofeedback unit was used for lumbar stabilization training. The findings of this study are summarized as follows: 1) The EMG activity of the erector spinae decreased significantly and the activity of the rectus abdominis, internal oblique, external oblique, gluteus maximus, and gluteus medius increased significantly with lumbar stabilization single leg standing. 2) No differences in activity in the tibialis anterior, medial gastrocnemius, rectus femoris, and medial hamstrings were found with single leg standing. 3) The mean velocity of COP in the antero-posterior and medio-lateral directions in the lumbar stabilization single leg standing decreased significantly compared with the preferred single leg standing. The findings of this study therefore indicate that lumbar stabilization can facilitate the co-activation of deep stabilization and global muscles that improve postural control capability during single leg standing.
Keywords
Center of pressure; Lumbar stabilization; Muscle activity; Single leg standing;
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