a comparative study of the use of gsr feedback ( n = 16 ) and schultz relaxation ( n = 15 ) with patients presenting tension headaches showed that there was no significant improvement in the group treated by relaxation at the end of the treatment whereas the group treated by gsr feedback showed significant improvements with respect to frequency and intensity of headaches and to anxiety as measured by subjects ' self-evaluation ( p less than 0.05 ) .
C0033893
tension headaches
C0018681
headaches