Comparison of Abdominal Muscles Thickness Changes Different Postures beween Non-Specific Chronic Low Back Pain Patients and Healthy Males by Ultrasonography

Objective: The purpose of this study is to compare the abdominal muscles thickness change at alteration in seated stability between healthy and non–specific chronic low back pain male subjects. Materials & Methods: In this case–control study, twenty non–specific chronic low back pain male patients whom had refered to physiotherapy clinics of university of Social Welfare and Rehabilitation Sciences and twenty healthy men were selected conveniently and simply. The thickness of Transverse Abdominis, Internal Oblique, External Oblique and Rectus Abdominis muscles of right side were measured with B mode ultrasonography (7. 5 MHz linear head) in supine lying (Position 1) , relaxed sitting on a chair (Position 2) , relaxed sitting on a gym ball (Position 3) and sitting on a gym ball lifting the left foot off the floor (Position 4). Measurement were taken at the end of both inspiration and expiration. Data were analyzied by Paired T and Independent T tests. Results: Transverse Abdominis and Internal Oblique at all of position and Rectus Abdominis only at position 4 were thicker at the end of expiration in both healthy and patient groups (P