Background and objectives: During the last years the effects of pulsative electromagnetic fields have been studied in the human and animals nervous system. The using of these fields in today living has caused worriment in safety of human. Stress causes very problems in behavior and function of biological systems. In this survey the effects of electromagnetic fields on stress behaviors of rats have been studied.

 Methods: In this study we aimed to investigate the effects of electromagnetic fields with 700 milli Gauss currency produced by triangle electrical currents with low (10 Hz) and high (110 kHz) frequencies on stress behaviors in 60 adult, male Wistar rats. The rats were divided to two groups of control and test. The animals were exposed to the field for 80 minutes and in order to evaluate the possible effect of electromagnetic fields the Tail pinch (T.P.) test was conducted. The results were analyzed using statistical tests.

  Results: Analyzing of the results of response time and stress behavior by T-test. In the group exposed electromagnetic fields of triangular low waves (10 Hz) for 80 min the results were meaningful (p < 0.05). The response and stressed behavior with this field is decreased very much. The results of two groups after 80 min under this field that have a difference in frequency showed that effects of frequency in behavior was meaningless.

  Conclusion: The results of this study showed that electromagnetic fields produce anti-stress effect in rats. The radio waves (A.W) have higher effects.