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The purpose of this study was to examine the effect of bridging using Swiss ball, whole body vibration (WBV), and mat on trunk and lower extremity muscle activity and postural stability. The results were as follows: 1) EMG activity of internal oblique increased significantly in WBV condition compared with mat condition (p<.05). 2) EMG activity of rectus femoris and medial gastrocnemius increased significantly in Swiss ball condition and WBV condition compared with mat condition (p<.05). 3) The muscle activity of medial hamstrings increased significantly in Swiss ball condition compared with mat condition (p<.05). 4) The limit of stability in three groups increased significantly in all directions after 4-week intervention (p<.05). 5). There were no significant differences in the limit of stability among three groups after 4-week intervention (p>.05). Therefore the trunk and lower extremity muscle activity increased in Swiss ball and WBV conditions, and postural stability was improved in three groups after intervention period. ■ keyword :∣Therapeutic Ball∣Whole Body Vibration∣Bridging ∣Trunk Muscle Activation∣Postural Stability∣ * "  2008       ."  : #090929-006  : 2009 09 29  : 2009 11 16  : , e-mail : tack@hanseo.ac.kr           349

Effect of Bridging Exercise Using Swiss Ball and Whole Body Vibration on Trunk Muscle Activity and Postural Stability