The authors investigated the effect of RFR from a cell phone on oxidant and antioxidant levels in rabbits. The RFR was delivered from a GSM phone at 900 MHz , 2W peak power, and average power density 0.02 mW/cm², for 30 minutes a day for 7 days. Eight rabbits were exposed, and 8 more served as controls.

Levels of oxidant and antioxidant enzymes in the brain were unchanged. Serum superoxide dismutase activity increased, and serum nitric oxide levels decreased, in exposed animals. Other parameters were unchanged in the serum.

The authors concluded that the findings may indicate the possible role of increased oxidative stress in the pathophysiology of adverse effect of electromagnetic radiation. The study can be criticized, however, for the small number of animals used in the study, and the lack of mention of blinding of participants.