The effect of progressive Muscle Relaxation program on self efficacy and Quality of life in caregivers of patients with multiple sclerosis

INTERVENTION: Intervention 1: progressive Muscle Relaxation: 90 sessions each 45 minutes, for three months. Intervention 2: No intervention in Control Group. No intervention in Control Group progressive Muscle Relaxation: 90 sessions each 45 minutes, for three months Rehabilitation CONDITION: Demyelinating diseases of the central nervous system Multiple sclerosis. ; Demyelinating diseases of the central nervous system PRIMARY OUTCOME: Self efficacy. Timepoint: Baseline and 3 months after intervention. Method of measurement: Questionnair. SECONDARY OUTCOME: Quality of life. Timepoint: Baseline and 3 months after intervention. Method of measurement: Questionnaire. INCLUSION CRITERIA: INCLUSION CRITERIA: living with patient, having a merit of decision for patients, having a responsibility of patients care Exclusion criteria: Presence of other diseases such as mental disorder, cognitive disorder, addiction, or other neurologic disorder