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Abstract
Background: The Transverse abdominal muscle has considered to have a protective role during activity that challenges the integrity of the lumbar spine. The purpose of this study was to investigate ultrasonographyically determined changes in the thicknesses of the transverses abdominal and internal oblique muscles during different sitting conditions. Subjects and procedures: Thirty normally developed children with age ranged from 8-10 years participated in this study. Muscle thicknesses of transverses abdominal and internal oblique muscles were assessed by the musculoskeletal ultrasonography in four different sitting conditions including (a) sitting, (b) sitting with abdominal hollowing maneuver (AHM), (c) sitting with left hip flexion, and (d) sitting with AHM and left hip flexion. Results:Transverses abdominal and internal oblique muscle thicknesses were significantly differntamonge sitting conditionsthere was a significant difference in TR on the right and left sides in different sitting conditions. And there was no significant difference in the IO muscle on the right and left side in different sitting conditions.In comparison between right and left sides in the sitting and AHM condition there was no significant different in the TR and IO.But in the condition of left hip flexion and AHM combined with left hip flexion, there was asignificant difference in the IO muscle and no significant difference in the TR