The following patients were excluded from the study: individuals who had had low back pain for less than three months; individuals who were receiving treatment for their pain with another method at the same time, except for medicines; pregnant women; patients who had undergone vertebral column surgery (less than three months before the time of this study); individuals with contraindications against electrotherapy, such as skin lesions, abnormal sensitivity, infectious and blood diseases, heart pacemakers or inability to answer questionnaires; patients with fibromyalgia; individuals with psychiatric problems; and individuals who refused to participate or were unwilling to follow a protocol lasting for two weeks.