Lack of correlation between frontalis EMG and either neck EMG or verbal ratings of tension.
D000293:Adolescent; D000328:Adult; D001676:Biofeedback, Psychology; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D009126:Muscle Relaxation; D009132:Muscles / Q000502:physiology*; D012064:Relaxation Therapy