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EMF Study
(Database last updated on Mar 27, 2024)

ID Number 1052
Study Type In Vivo
Model 1.4 GHz (PDC) exposure to rats and analysis of sleep, melatonin, estrogen, and immune function

Sprague-Dawley rats (n=64 per group, 208 total) were exposed to 1439 MHz TDMA RF (50-Hz, 6.7 millisecond pulses comparable to Japanese PDC for mobile phones) for an average brain SAR of 7.5 W/kg, and the average whole body SARs of 1.9 and 2.0 W/kg for male and female rats, respectively. A total of 208 male and female rats were investigated. After acclimatization to a 12 h light-dark (LD) cycle, serum and pineal melatonin levels together with pineal serotonin level under a dark condition (less than 1 lux) were examined by radioimmunoassay. No significant differences in melatonin and serotonin levels were observed between the exposure, sham, and cage control groups. These results suggest that short term exposure to a 1439 MHz TDMA EMF, which is about four times stronger than that emitted by mobile phones, does not alter melatonin and serotonin synthesis in rats. In a related study ovariectomized female Sprague-Dawley rats (n = 32) were exposed to 1.4 MHz (PDC) RF field 4 hr for 3 consecutive days at a brain avg SAR of 7.5 W/kg. The authors report exposure did not affect uterine wet weight or serum estradiol levels.

Findings No Effects
Status Completed With Publication
Principal Investigator Tokyo University, Japan -
Funding Agency MIC, Japan
Country JAPAN
  • Hata , K et al. Bioelectromagnetics, (2005) 26:49-53
  • Yamashita , H et al. Bioelectromagnetics., (2010) 31:573-575
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