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

[GSM900 MHz電磁界への頭部ばく露はラットの空間認知を変えない] med./bio.

Head-only exposure to GSM 900-MHz electromagnetic fields does not alter rat's memory in spatial and non-spatial tasks.

掲載誌: Behav Brain Res 2003; 145 (1-2): 51-61

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研究目的(著者による)

The study is a follow-up of previous work (publication 8336) on the effects of head-only exposure of rats to GSM electromagnetic fields. There were two main objectives: to study GSM effects on spatial memory with more complex procedures, and to enlarge the investigation

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: repeated daily exposure for 45 min for 7, 9 or 12 days
  • SAR: 1 W/kg average over mass (brain)
  • SAR: 3.5 W/kg average over mass (brain)
ばく露2: 900 MHz
Modulation type: pulsed
ばく露時間: repeated exposure for 45 min, 2 days apart
  • SAR: 1 W/kg average over mass (brain)
  • SAR: 3.5 W/kg average over mass (brain)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 repeated daily exposure for 45 min for 7, 9 or 12 days
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • loop antenna: printed circuit with 2 metallic lines printed on dielectric substrate
ばく露装置の詳細 During exposure, rats were restrained in rockets made of 5-mm-thick Plexiglas and consisting of a cylinder (6 cm diameter, 15 cm length) and a truncated cone (3 cm length) in which the rat inserted its head. The loop antenna was placed against the cone directly above the rat's head. The four rockets for simultaneous exposure were separated from each other by a double layer of a 12 cm absorbing material to prevent interference from one antenna to another.
Additional information The performances of exposed rats were compared to those of sham-exposed and cage-control rats.
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg average over mass 測定値および計算値 brain -
SAR 3.5 W/kg average over mass 測定値および計算値 brain -

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 repeated exposure for 45 min, 2 days apart
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg average over mass 測定値および計算値 brain -
SAR 3.5 W/kg average over mass 測定値および計算値 brain -

Reference articles

  • Dubreuil D et al. (2002): [ラットの空間学習タスクにGSM-900電磁界の頭部ばく露は影響するか?]
  • Chou CK et al. (1999): [ハンドヘルド無線電話からのRF電磁界への人体ばく露を模擬したラット頭部ばく露システムの開発]

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:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

In one of the spatial memory tasks (without delay), a slightly improved performance was found after 3.5 W/kg exposure, a result that was not observed in the other spatial memory task (with an intra-trial delay). In the non-spatial memory task (object recognition task), although some effects on exploratory activity were found, recognition memory was unaffected in exposed rats. Altogether, this set of experiments provides no evidence indicating that spatial and non-spatial memory can be affected by an exposure to 900 MHz GSM electromagnetic fields.

研究の種別:

研究助成

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