Aim: To describe Randomized Controlled Trials (RCTs) that tested progressive muscle strength exercises in adult patients with chronic low back pain, and confirm the guidelines that guide the progression system of variables used in exercise programs for muscle strength.Methods: We searched RTCs in Medline and Cochrane with controlled descriptors for low back pain and exercise. Two reviewers independently assessed the quality of the studies using the PEDro scale score. Studies that developed the muscle strength exercise program according to the guidelines of the American College of Sports Medicine were included.Results: Twenty-eight articles were recruited, 22 RTCs retrieved from Medline and 6 from Cochrane, after the analysis, only one study partially met the eligibility criteria.Conclusion: It has a gap RTCs on progressive resistance exercises for muscle strength in patients with chronic non-specific low back pain, also, literature does not have guidelines to guide the progression system of variables used in exercise programs for muscle strength in this population.