The purpose of this study is to investigate the effectiveness of low-intensity and prolonged vibrotactile sensory stimulation on symptom relieve in fibromyalgia patients.

The trial will last up to 8 weeks for each subject and includes:

Three weeks treatment 1 (sham or actual) Two week washout Three weeks treatment 2 (sham or actual) Vibrotactile sensory stimulation will consist on whole-body stimulation with mechanical stimuli of pallesthetic type at high rate, low intensity and long daily duration.

Inclusion Criteria:

• A diagnosis of fibromyalgia according to the American College of Rheumatology (ACR) (Arthritis Rheum, 1990;33:160-172)
• Clinical symptoms are not a consequence of other medical disorder (although the presence of other disorders is not an exclusion criterion)
• Diagnoses established by an expert on fibromyalgia.
• Stable treatment of chronic use.
• Subject demonstrates an understanding of the study and a willingness to participate as evidenced by voluntary written informed consent.

Exclusion Criteria:

• Generalized inflammatory articular or rheumatic disease.
• Heavily exercise for 12 hours prior to fMRI assessment
• Severe, non-stable medical, endocrinological or neurological disorder.
• Psychotic disorder or drug abuse.

a sham device identical to the active device