Objectives: To assess the effectiveness of supervised stability training on clinical symptoms, range of motion and endurance of lumbar muscles in female patients with nonspecific chronic low back pain. Patients and Methods: A sample of convenience of 35 patients with nonspecific chronic low back pain were assigned to intervention group (n=18, age=26/88±8/4 mass= 57/42±8/6) and control group (n=17, age=25/23±8/9 mass=58/94±10/5). Patients performed stability programs continuously in ten days. Endurance of flexors, extensors and rotators trunk muscles and bilateral quadratus and multifidus muscles were measured with clinical tests. Range of motion and pain severity were assessed with schober test and visual analogue scale pre and post treatment respectively. Results: Qualitative, anthropometric and quantitative variables revealed no significant differences in two groups before treatment. The results of paired t-test showed a significant difference in quadratus and multifidus muscles endurance and pain intensity in intervention group after treatment(p<0.05). On the other hand, multifidus muscle endurance and pain intensity indicated significant differences between two groups after treatment (p<0.05). Other variables in both groups didn’t reveal any significant differences. Conclusions: Ten days supervised stability training may be effective in tonic muscular function and pain relief in patients with non specific chronic low back pain.

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