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The purpose of study is that we will observe the change of c-fos with the immunohistochemistry method and then we will study the effect of micro current stimulation following the frequency after inducing pain to rats with capsaicin. Rat were classified to SD and they have growed for 8 weeks. We classify to four groups, ordinal group is used in experiment I, the group which we induce pain is used in experiment II, the application group which we induce pain and then the high frequency micro current stimulation is used in experiment III, the application group which we induce pain and then the low frequency micro current stimulation is used in experiment IV, we get the following result. Compare with experiment II, experiment III, and experiment IV from acute pain modal in the immunohistochemistry experiment which has c-fos protein as an antigen, c-fos immunoreactive positive neurons significantly after induced pain for two hours(p<0.001). According to these results, from rats induced pain, micro current stimulation effect to reducing pain, but following frequency micro current stimulation theraphy isn’’t different from immunoreactive c-fos
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