Background: During the recent years a large number of microwave radiating appliances, e.g. cell phone, radio, television, electric home appliances, etc, have been produced and used in a wide range. Therefore ٫ researchers in biology have paid special attention to the effects of the waves on the human health and the animal growth process. This research studies the effects of the cell phone waves (940 MHz) on the hematopoietic system of immature Balb/C mice.

Materials and Methods: In this experimental research a microwave generating system (940 MHz) consisting of a special cage with two built-in cell phones was used. Immature mice were exposed to the waves of two active cell phones for 30 min /daily for a period of fifteen days. Having completed the feeding and caring process ٫ the mice from three control, sham-exposed and experimental groups were dissected. To assay blood parameters, blood was taken from the heart and to carry out the histological studies, spleen, liver and bone marrow were prepared for light microscopy studies. The quantitative data were analyzed with SPSS software and one-way ANOVA with the consideration of the significant level of p<0.05.

Results : The cell phone waves (940MHz) have no significant effect on the number of WBC, Hb, MCV, MCH, MCHC (p>0.05). While a decrease in the number of white pulp lymphocytes, and megakaryocytes in the experimental samples were seen compared to the control and sham-exposed groups (p≤0.001), the number of white pulp, spleen diameter and diameter of white pulp had no significant difference in control and sham-exposed and experimental groups (p>0.05). In the liver of experimental mice, the number of mononuclear cell complexes and Kupffer cells had a significant decrease compared to the control group (p≤0.001). The number of hepatocytes in both control and experimental groups showed no significant difference (p>0.05).There was an increase in the mean number of bone marrow cells and their division compared to the control samples (p≤0.001).

Conclusion : The cell phones waves have an effect on some cells of liver, spleen and bone marrow in immature BALB/c mice.

Background: Nowadays the widespread use of cell phones has increased concerns about the biological effects of electromagnetic fields on human body. The purpose of the present study was to examine the role of physical activity in moderating the effects of extremely low frequency electromagnetic fields (ELF-EMF) emitted from cell phones on rat locomotor activity.

Material and Methods: Male Albino-Wistar rats (no=70) were divided into seven groups: Short and Long- term physical activity; Control, ELF-EMF; Sham; Long-term physical activity+ELF-EMF; Short-term physical activity+ELF-EMF. Short and Long- term physical activity groups were forced to daily treadmill running (30 minutes) for one week and one month, respectively. ELF-EMF group was exposed to ELF-EMF cell phone simulator for three hours during the period. Having placed in the ELF-EMF simulator device, the physical activity+ELF-EMF groups were transferred to treadmill. Locomotor activity were analyzed as distance, time and speed of movement in open field apparatus.

Results: The results showed that the ELF-EMF from cell phones can significantly decrease the locomotor activity in the exposed rats. On the other hand, short and long-term physical activity significantly increased motor activity in the trained rats (P≤0.05). However, there was no significant difference between the combination groups (Physical activity+ELF-EMF) and ELF group in locomotor activity.

Conclusion: The results revealed that the physical activity could not prevent the decrease of locomotor activity caused by ELF-EMF from cell phone.