Inclusion Criteria:  Men and women aged 18-80 years To be eutrophic (BMI: 25-27 kg/cm2) Self-report of recurrent (≥ 3 x/week) or continuous episodes of nonspecific low back pain for at least 3 months, comprising the lumbar region between L1-L5 To be physiscally active according to the International Physical Activity Questionnaire (IPAQ)  Exclusion Criteria:  To present a history of musculoskeletal disorders that could affect muscle function To make use of medicines that could affect muscle function. To present low back pain of specific etiology, such as: tumor, herniated disc, facet syndrome, canal stenosis, among others. To have used ergogenic supplements and anabolic steroids for at least six months before study To present severe skin diseases in the lumbar region, such as: erysipelas, eczema, dermatitis, psoriasis and urticaria To have restrictions for exercises practice considering Physical Activity Readiness Questionnaire (PAR-Q) responses.