Methods: 40 volunteer patients, female, with fibromyalgia will take part of the cuasi-experimental study and they will be divided into two groups: an experimental group (n = 20) and a control group (n = 20). The Maximum Inspiratory Pressure (PIM), the quality of life, lumbar pain, phase angle and body composition will be measured.~Inspiratory muscle training with Powerbreath IMT device, for a duration of 8 weeks. Each day, each subject perform 5 sets of 10 inspirations, 5 days a week. The endurance of the device increases along the study, initiating with the 50% of their own maximum inspiratory pressure (MIP) during the first week, 2nd week: 55% MIP, 3rd week: 60% MIP, 4th week: 65% MIP, 5th week: 70% MIP, 6th week: 75% MIP, 7th week: 80% MIP and 8th week:80% MIP~After 8 weeks, all participants will fill up again all scales and post training measurements will be taken.
Context/background: people affected by fibromyalgia see their own life totally disturbed after the diagnosis. This disease also courses, apart from the functional and depressing worsening, with internal damage manifested by a cardio respiratory deterioration. There are not many clinical studies publications about this disease given that is considered a weird illness with short prognosis.~Objectives: to examine the effects of the inspiratory muscle training (IMT) on respiratory muscle strength, lumbar pain, quality of life, phase angle and body composition in patients with Fibromyalgia.~The participants of experimental group will conduct 5 sets of 10 inspirations per day, 5 days per week, through 8 weeks.