title: The role of relaxation in biofeedback training: a critical review of the literature.
mesh_terms: D001676:Biofeedback, Psychology; D006801:Humans; D009119:Muscle Contraction; D009126:Muscle Relaxation; D011602:Psychophysiologic Disorders / Q000628:therapy; D012064:Relaxation Therapy; D013315:Stress, Psychological