Chronic nonspecific low back pain is a serious problem that affects many people in the world, causing disability and high economic costs; however, there is no consensus and evidence on the most effective treatment. The evaluation is fundamental in the treatment and prevention of this disease. It is necessary to evaluate the patient in a complete and deep way, capturing all aspects that might interfere with this condition, without being tied to only the most obvious aspects such as pain. Objective: To evaluate and verify the association of the following variables: functional performance, pain, kinesiophobia and functional disability in patients with chronic nonspecific low back pain. Methods: Sixty six individuals age between 20 to 60 years old with chronic nonspecific low back pain will be selected. In addition to collecting clinical data (history, heart rate and blood pressure), the evaluations contain: pain intensity as measured by the Numerical Pain Scale; quality of pain by the McGill Pain Questionnaire; kinesiophobia through the Tampa Scale kinesiophobia; functional performance with the six-minute walk test; and functional disability by Roland-Morris Questionnaire. In the statistical analysis, the significance level is ± d0.05.
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