BACKGROUND: Non-specific chronic low back pain is a major health problem and socio-economic order responsible for a high of absenteeism from work and reduced functional performance. The practice of supervised exercise and cognitive behavioral therapy are recommended in the treatment of patients with low back pain by presenting positive results in improving symptom. However no studies have compared the effect of gradual activity based on principles of cognitive behavioral therapy versus supervised exercise program (strengthening, stretching and motor control) in patients with nonspecific chronic low back pain. OBJECTIVE: To compare the effect of cognitive behavioral therapy and exercises (gradual activity) versus supervised exercise program in patients with Non-specific chronic low back pain. METHOD: Sixty-six subjects will be randomized into two groups: Group Behavior Therapy - Graded Activity (AG) and Supervised Group Exercises (ES). The groups will be treated in two weekly sessions lasting about one hour for six weeks, totaling 12 sessions. The primary clinical outcomes will be pain, assessed using the numerical pain scale and McGill Pain Questionnaire and disability assessed with Roland Morris Disability Questionnaire. Secondary outcomes will be measured with the overall perception of the scale of global perceived effect, quality of life using the Short-Form Health Survey questionnaire (SF-36) and return to work. The outcomes will be obtained assessments before and after the intervention and after three and six months of treatment completion. Data will be collected by a blinded assessor to treatment group. STATISTICS: Testing will take place one-way ANOVA (baseline), two-factor ANOVA (post intervention) and multiple comparison test post-hoc Tukey for the data considered normal. For non-normal data will be applied the Wilcoxon Signed Rank Test. The significance level ± < 0.05. Statistical tests are performed in software SigmaStat 3.5.
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