en Radiation Biology Radiation Biology گزارش کوتاه Short Report <p style="text-align: justify;"><strong>Background:</strong> The health effect of rapidly increasing everyday exposure of humans to radiofrequency radiation is a major global concern. Mobile phone jammers prevent the mobile phones from receiving signals from base stations by interfering with authorized mobile carriers&rsquo; services. In spite of the fact that mobile jammer use is illegal, they are occasionally used in offices, shrines, conference rooms and cinemas. The purpose of this study was to investigate the biological effects of short term exposure of human sperm to radiofrequency radiation emitted from a commercial mobile phone jammer. <strong>Materials and</strong> <strong>Methods:</strong> Fresh semen samples were obtained by masturbation from 50 healthy donors who had referred with their wives to Infertility Treatment Center at the Mother and Child Hospital, Shiraz University of Medical Sciences. Female problem was diagnosed as the reason for infertility in these couples. The semen sample of each participant was divided into 4 aliquots. The first aliquot was subjected to swim-up and exposed to jammer radiation. The second aliquot was not subjected to swim-up but was exposed to jammer radiation. The third and fourth aliquots were not exposed to jammer radiation but only the 3^rd aliquot was subjected to swim-up. &nbsp;<strong>Results:</strong> Semen samples exposed to radiofrequency radiation showed a significant decrease in sperm motility and increase in DNA fragmentation. <strong>Conclusion:</strong> Electromagnetic radiation in radiofrequency range emitted from mobile phone jammers may lead to decreased motility and increased DNA fragmentation in human semen. It can be concluded that mobile phone jamming might exert adverse reproductive health effects.</p> <p></p> Mobile phone jammers, sperm motility, DNA fragmentation, EMFs, microwave, RF, reproductive health. 63 70 http://ijrr.com/browse.php?a_code=A-10-1-650&slc_lang=en&sid=1 M. E. Parsanezhad 790031947532846009908 790031947532846009908 No Department of Obstetrics and Gynecology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran S. M. J. Mortazavi mortazavismj@gmail.com 790031947532846009909 790031947532846009909 Yes Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran T. Doohandeh 790031947532846009910 790031947532846009910 No Department of Obstetrics and Gynecology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran B. Namavar Jahromi 790031947532846009911 790031947532846009911 No Department of Obstetrics and Gynecology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran H. Mozdarani 790031947532846009912 790031947532846009912 No Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran A. Zarei 790031947532846009913 790031947532846009913 No IVF center, Shiraz University of Medical Sciences, Shiraz, Iran M. Davari 790031947532846009914 790031947532846009914 No IVF center, Shiraz University of Medical Sciences, Shiraz, Iran S. Amjadi 790031947532846009915 790031947532846009915 No IVF center, Shiraz University of Medical Sciences, Shiraz, Iran A. Soleimani 790031947532846009916 790031947532846009916 No Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran M. Haghani 790031947532846009917 790031947532846009917 No Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran