IRCT2015011120639N1 IRCT 2016-03-10 Semnan University of Medical Sciences Comparing two voluntary and involuntary training of abdominal muscles on the size of them in chronic low back pain patients. The comparison of automatic and voluntary training on lateral abdominal muscles thickness in chronic non-specific low back pain patients. 2016-04-20 anticipated 60 Complete https://irct.ir/trial/18271 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. 2-3 Chronic non- specific low back pain. Intervention 1: Doing 6 weeks of voluntary contraction of abdominal muscles, three times a week. Intervention 2: Doing 6 weeks of automatic training of abdominal muscles, three sessions a week. Intervention 3: No intervention during 6 weeks.

public Dr. Rozita Hedayati

Rehabilitation faculty, Semnan University of Medical Sciences, The 5TH kilometers of Damghan road.

Semnan Iran (Islamic Republic of) +98 23 3365 4180 rosehed@yahoo.com Semnan University of Medical Sciences scientific Dr. Rozita Hedayati

Rehabilitation faculty, Semnan University of Medical Sciences, The 5th kilometers of Damghan road.

Semnan Iran (Islamic Republic of) +98 233333895 rosehed@yahoo.com Semnan University of Medical Sciences Iran (Islamic Republic of) Inclusion criteria: patients with nonspecific low back pain, average age of 18-45 years, history of low back pain lasting 3 mounts during one year ago. Exclusion criteria: history of diabetes, muscloskeletal disorders, systemic diseases, spondylolysis and spondylolisthesis, history of previous surgery in the spinal region, history of lumbar trauma during previous year of the study, disk herniation, nerve root comparison, polyneuropathies, carsinoma, malignancy of the spinal region, balance disorders, pregnancy, history of back training during 3 months before the study, drugs using with side effect on the postural control system. 18 years 45 years Both M99.9 Biomechanical Lesion, Unspecified Rehabilitation Rehabilitation N/A Doing 6 weeks of voluntary contraction of abdominal muscles, three times a week Doing 6 weeks of automatic training of abdominal muscles, three sessions a week No intervention during 6 weeks. Transvers abdominis, internal oblique and external oblique muscle thikcness. Timepoint: Before and 6 weeks after intervention. Method of measurement: Ultrasonography. Pain and disability. Timepoint: Begening of study, after 6 weeks intervention. Method of measurement: Roland-Morris disability questionnair, Visual analogue scale. Semnan University of Medical Sciences Approved 2015-03-17 Ethics committee of Semnan University of Medical Sciences Rehabilitation faculty, Semnan University of Medical Sciences, the 5th kilometers of Damghan road Semnan Iran (Islamic Republic of)