研究のタイプ: 医学/生物学の研究 (experimental study)

[1439 MHzパルスTDMA電磁界への短期ばく露はラットにおけるメラトニン生成に影響しない] med./bio.

Short term exposure to 1439 MHz pulsed TDMA field does not alter melatonin synthesis in rats.

掲載誌: Bioelectromagnetics 2005; 26 (1): 49-53

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研究目的(著者による)

To clarify the effects on melatonin synthesis in rats after short-term exposure to a 1439 MHz TDMA (time division multiple access) electromagnetic field.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1,439 MHz
Modulation type: pulsed
ばく露時間: continuous for 4 h
  • SAR: 7.5 W/kg average over mass (brain)
  • SAR: 2 W/kg average over mass (whole body) (for the female (283 g))
  • SAR: 1.9 W/kg average over mass (whole body) (for the male (370 g))

ばく露1

主たる特性
周波数 1,439 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 4 h
Modulation
Modulation type pulsed
Pulse width 6.7 ms
Duty cycle 33.3 %
Repetition frequency 50 Hz
Additional information

TDMA signal for a PDC (Personal Digital Cellular) system

ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 The carousel type exposure system (already used in the reference article) consisted of a small anechoic chamber, a round table with eight tubes, where rats were kept, and a quarter-wavelength monopole antenna on the metal floor.
Additional information The rats were divided into four groups: exposure, sham, cage control, and light control (LC) group. Rats in the sham group were placed in the exposure system without TDMA exposure. Those in the cage control group were not placed in the exposure system. Those in the LC group (positive control) were exposed on the last day to the light condition (400 lux) until measurement.
パラメータ
測定量 種別 Method Mass 備考
SAR 7.5 W/kg average over mass 測定値および計算値 brain -
SAR 2 W/kg average over mass 測定値および計算値 whole body for the female (283 g)
SAR 1.9 W/kg average over mass 測定値および計算値 whole body for the male (370 g)

Reference articles

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
  • pineal gland, blood
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

No significant differences in melatonin and serotonin levels were revealed between the exposure, sham, and cage control groups. These data suggest that short-term exposure to a 1439 MHz TDMA electromagnetic field, which is about four times stronger than that emitted by mobile phones, does not alter melatonin and serotonin synthesis in rats.

研究の種別:

研究助成

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