It is a randomized clinical trial with the objective of analyzing the frequency used in the vectorial interferential current research. The research promotes a significant reduction of the painful response in the tender points of the trapezius muscles in patients diagnosed with fibromyalgia. Eleven females were selected and seen for ten physical therapy sessions, twice a week. These females were randomly distributed into two groups with different frequencies of interferential current: 20 and 150 Hz. The comparative analysis was perfomed according to the analog visual scale of pain and digital pressure exerted in the tender points, before and after the application of the current. There was a significant result regarding the analgesic effect and improvement in the life quality obtained by the 20 Hz frequency as compared to the 150 Hz. Both groups showed a significant difference to the digital pressure exerted in the area of pain. Further research should be conducted with a greater number of cases, a longer trial period, and the utilization of dolorimeter in order to make the results reliable.

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