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Abstract Background Chronic low back pain is an expensive and difficult condition to treat. One of the interventions widely used by physiotherapists in the treatment of chronic non-specific low back pain is exercise therapy based upon the Pilates principles. Pilates exercises can be performed with or without specific equipment. These two types of Pilates exercises have never been compared on a high-quality randomised controlled trial. Methods/design This randomised controlled trial with a blinded assessor will evaluate eighty six patients of both genders with chronic low back pain, aged between 18 and 60 years, from one Brazilian private physiotherapy clinic. The patients will be randomly allocated into two groups: Mat Group will perform the exercises on the ground while the Equipment-based Group will perform the Pilates method exercises on the following equipment: Cadillac, Reformer, Ladder Barrel, and Step Chair. The general and specific disability of the patient, kinesiophobia, pain intensity and global perceived effect will be evaluated by a blinded assessor before randomisation and at six weeks and six months after randomisation. In addition, the expectation of the participants and their confidence with the treatment will be evaluated before randomisation and after the first treatment session, respectively. Discussion This will be the first study aiming to compare the effectiveness of Mat and Equipment-based Pilates exercises in patients with chronic non-specific low back pain. The results may help health-care professionals in clinical decision-making and could potentially reduce the treatment costs of this condition. Trial registration Brazilian Registry of Clinical Trials RBR-7tyg5j

Background: Chronic low back pain is one of the four most common diseases in the world with great socioeconomic impact. Supervised exercise therapy is one of the treatments suggested for this condition; however, the recommendation on the best type of exercise is still unclear. The Pilates method of exercise is effective in reducing pain and disability in these patients, as well as the analgesia promoted by interferential current. Currently, the literature lacks information on the efficacy of the association of these two techniques in the short- and medium-term than performing one of the techniques isolated. The objective of this study will be to evaluate the efficacy of adding interferential current to the Pilates method exercises for the treatment of patients with chronic nonspecific low back pain in the short- and medium-term. Methods/design: This study will be a randomized controlled trial with two arms and blinded evaluator, conducted at an outpatient Physical Therapy Department in Brazil. Patients with nonspecific chronic low back pain and pain equal to or greater than 3 in the Pain Numerical Rating Scale (0/10) will be randomly assigned to one of two groups: Group with active interferential current + Pilates (n = 74) will be submitted to the active interferential current associated to the modified Pilates exercises, and Group with sham interferential current + Pilates (n = 74) will be submitted to the sham interferential current associated with the modified Pilates exercises during 18 sessions. The outcomes pain intensity, pressure pain threshold, general and specific disability, global perceived effect and kinesiophobia will be evaluated by a blinded assessor at baseline, six weeks and six months after randomization. Discussion: Because of the study design, blinding of the participants and the therapists involved in the study will not be possible. The results of this study could contribute to the process of clinical decision-making for the improvement of pain and disability in participants with nonspecific chronic low back pain. [ABSTRACT FROM AUTHOR]