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126     CHAPTER 5 CHRONIC TTH ANALYSIS BY EMG AND GSR BIOFEEDBACK




                GSRv: After applying the therapies, the data started moving toward the quartile of low duration and
             low frequency. This trend continued and at the end of the year, the majority of data came under the zone
             of low frequency and low duration with the exceptions of four subjects.
                EMGv: There was high rate of convergence of data toward the lower quartile of low duration and
             low frequency in the initial months and this continued until the end of the year. The data came under the
             average values for most of the subjects.
                It was found that EMGv converged most diverged data more effectively than that of GSRv.




             5.8.13 THE TREND OF AVERAGE OF FREQUENCY
             GSRav: The improvement in reduction of TTH occurrence frequency to subject was not at a constant
             rate. The improvement rate from chronic type TTH varied for different time periods, which clearly
             indicates that there was some kind of noise (either in the form of motivational loss or lower efficiency
             of feedback therapy) in the system or the failure of applied GSR therapy in improving the TTH con-
             tinuously (Fig. 5.20).
                On concluding observations, in the time period from 3 to 6months, the average of frequency in-
             creased from 3.815 to 3.88/week with a dropout of 3 subjects due to disinterest or distrust in the
             techniques.
                During the experiment, the frequency reduced from an average of 5.893 to 2.591/week (3.302/week
             reduced). Total dropouts in the experiment was 6.


                                                Period                            Techniques, period
                    7.519                                                           EMGav, BaseLine
                  Subjects: 27                                                      EMGav, 1 month
                7                                                                   EMGav, 3 months
                                                                                    EMGav, 6 months
                    5.893       6.462             5.760
                  Subjects: 28                                                      EMGav, 12 months
                6             Subjects: 26       Subjects: 25
                                                                                    GSRav, BaseLine
                                                                                    GSRav, 1 month
                                                                                    GSRav, 3 months
                5                                              Subjects: 23         GSRav, 6 months
                                                                4.478
               Avg. frequency  4  Subjects: 28  3.815       3.880           2.909   GSRav, 12 months
                                4.429
                3                             Subjects: 27  Subjects: 25  Subjects: 22
                                                                           2.591
                                                                          Subjects: 22
                2

                1

                0
                     BaseLine     1 month      3 months    6 months     12 months
             FIG. 5.20
             Variation of frequency with time.
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