https://eric.ed.gov/?id=EJ129147
ERIC - EJ129147 - Differential Effectiveness of Electromyograph Feedback, Verbal Relaxation...
Adults with chronic tension headaches were assigned to auditory electromyograph (EMG) feedback (N=9), to progressive relaxation (N=9), and to placebo treatment...
ericdifferentialeffectivenessfeedbackverbal