Background : Different regions of radio frequency spectrum of electromagnetic waves have various physiological effects on biological systems. Since short wave is routinely used as a therapeutic means to elevate deep body temperature, it seemed worthwhile to investigate the none thermal effects of this frequency band.

Materials and methods : For this experimental study, 42 normal individuals aged 20-30 years were selected. The nerve latency was measured at the left wrist before and after 10 minutes exposure to the lowest field intensity to assure minimal thermal effect. Paired t-test was used for data analysis.

Results : Small variation has minimal effect on latency values. 95% of the subjects demonstrated latency change due to the field. The 8.56% difference between the latencies measured before and after applying the field was statistically significant. The difference has lasted for 11 minutes.

Conclusion: Short wave radio frequency does influence on nerve latency. Further studies are strongly recommended.