Behavioral Psychology / Psicología Conductual, Vol. 24, Nº 3, 2016, pp. 439-457 FIBROMYALGIA: EFFECT OF A COGNITIVE BEHAVIORAL TREATMENT WITH AND WITHOUT BIOFEEDBACK ON PSYCHOPATHOLOGICAL SYMPTOMS 1 Maite Garaigordobil 1 and Leila Govillard 2 1 University of the Basque Country; 2 Deusto University (Spain) Abstract The purpose of the study was to design two cognitive behavioral treatments (CBT) for people with fibromyalgia (FM): therapy with electromyographic biofeedback (T1) and therapy without biofeedback (T2); and to assess their effects on psychopathological symptoms. The study was carried out with 88 people diagnosed with FM, aged between 26 and 65 years; 33 received T1, 33 received T2, and 22 were assigned to a control group without treatment. An evaluation was performed before and after a treatment of 10 sessions with the “Symptom Checklist-90-Revised,” the “State-Trait Anxiety Inventory,” the “Beck Depression Inventory” and “State-Trait Anger Expression Inventory”. The results showed that participants who had received a treatment decreased symptoms of hostility, state-anxiety, trait-anxiety, depression, trait-anger, and anger expression (p< .05). The effects of the two treatments were similar, and no significant group differences were found for any variable. The control group decreased less the symptoms, increasing anxiety and anger. This work provides an efficacious tool to reduce psychopathological symptoms and negative feelings in people with FM. KEY WORDS: fibromyalgia, cognitive behavioral therapy, psychopathological symptoms, anger, depression. Resumen El estudio tuvo como objetivo diseñar dos tratamientos cognitivo conductuales (TCC) para personas con fibromialgia (FM), uno con biofeedback electromiográfico (T1) y otro sin biofeedback (T2), y evaluar sus efectos en síntomas psicopatológicos. El estudio se realizó con 88 personas con diagnóstico de FM, entre 26 y 65 años, 33 recibieron el T1, 33 el T2 y 22 fueron el grupo control sin tratamiento. Se realizó una evaluación antes y después del tratamiento de 10 sesiones con el “Listado de 90 síntomas-revisado”, el “Inventario de ansiedad estado-rasgo”, el “Inventario de depresión de Beck” y el “Inventario de expresión de ira estado-rasgo”. Los resultados muestran que los pacientes que recibieron algún tratamiento disminuyeron en síntomas de hostilidad, ansiedad- estado, ansiedad-rasgo, depresión, ira-rasgo y expresión de sentimientos de ira (p< 0,05). Los efectos de ambos tratamientos fueron similares, no se hallaron The study has been financed by the Department of Education of the Basque Government (IT-638-13) and by the University of the Basque Country (UFI PSIXXI 11/04). Correspondence: Maite Garaigordobil, Avda. de Tolosa, 70, 20018 San Sebastián (Spain). E-mail: maite.garaigordobil@ehu.eus