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

[ニワトリおよびマウスにおけるテレビ、ディスプレイ端末、携帯電話からの電磁界放射の毒性学的研究] med./bio.

Toxicologic study of electromagnetic radiation emitted by television and video display screens and cellular telephones on chickens and mice.

掲載誌: Indoor Built Environ 2001; 10: 291-298

この研究は、コンピュータディスプレイ端末(VDU)、GSM携帯電話から放射される電磁界ばく露をニワトリやマウスの胚および幼若個体に与え(銅線の網を用いて、放射スペクトラムや強度を変化させたと述べている)、その毒性的影響を調べた。その結果、VDUへのばく露により、胎仔消失が増加し、血中の抗体コルチコステロンメラトニンの低下がみられた、などを報告している。

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研究目的(著者による)

The effects of exposure of chicken embryos to electromagnetic fields from a TV, computer screen or a 900 MHz mobile phone on embryonic mortality, immunologic and hormonal blood parameters should be investigated. Additionally, the effects of exposure of mice to a 900 MHz mobile phone on hormonal blood parameters and cancer should be investigated.

詳細情報

Chicken Embryos (fertilized eggs) were divided into the following groups: 1) TV exposure until 47 days after hatching (n=30), 2) computer screen exposure (n=30) until 47 days after hatching, 3) TV exposure until hatching (n=60), 4) computer screen exposure until hatching (n=60), 5) mobile phone exposure until hatching (n=60; 3 repetitions), 6) mobile phone exposure with shielding gauze against radiofrequency fields until hatching (n=60; 2 repetitions). For each group, a separate corresponding sham exposure group with the same amount of embryos, respectively, was used.
Mice were exposed to the mobile phone from an age of 5 weeks up to 20 weeks. At the age of 17 weeks, Lewis tumor cells were injected. The mice were divided into the following groups (n=15 each): 7) sham exposure without tumor injection as control group, 8) sham exposure and tumor injection, 9) mobile phone exposure and tumor injection, 10) mobile phone exposure with shielding gauze and tumor injection, 11) mobile phone exposure and tumor injection and additional examinations before tumor injection.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
ばく露時間: continuous for up to 15 weeks
mobile phone without shielding gauze
ばく露2: 900 MHz
ばく露時間: continuous for up to 15 weeks
mobile phone with shielding gauze
ばく露3:
  • unspecified
ばく露時間: continuous for up to 47 days
TV
  • 磁束密度: 135 nT minimum (in extremely low frequency range)
  • 磁束密度: 270 nT maximum (in extremely low frequency range)
ばく露4:
  • unspecified
ばく露時間: continuous for up to 47 days
computer screen
  • 磁束密度: 140 nT minimum (in extremely low frequency range)
  • 磁束密度: 660 nT maximum (in extremely low frequency range)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for up to 15 weeks
Additional information mobile phone without shielding gauze
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • GSM
チャンバの詳細 non-metal cages for mice
ばく露装置の詳細 the phone sent an automatic call every minute; for eggs: mobile phone was placed in the center of the plate supporting the eggs at a height of 10 cm and 5 cm from the surface of the eggs with its front side facing them; for mice: phone was placed 4 cm below their cage; room temperature for mice was 22°C
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電界強度 18 V/m maximum 測定値 - -
磁束密度 0.03 µT maximum 測定値 - converted from 90 dBpT
電力 2 W maximum - - -

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for up to 15 weeks
Additional information mobile phone with shielding gauze
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
チャンバの詳細 non-metal cages for mice
ばく露装置の詳細 addition to setup E1: an earthed copper gauze of 0.47 m x 0.57 m and mesh diameter of 350 pm was interposed between eggs or the mice and the mobile phone; grid did not touch the animals but was placed 1 cm from the eggs or the mice
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電界強度 6 V/m maximum 測定値 - -
磁束密度 0.03 µT maximum 測定値 - converted from 90 dBpT
電力 2 W maximum - - -

ばく露3

主たる特性
周波数
  • unspecified
タイプ
  • magnetic field
ばく露時間 continuous for up to 47 days
Additional information TV
Additional information whole spectrum of electromagnetic waves including radio frequencies, infrared frequencies, microwaves and X-rays but mostly visible light, very low frequency and extremely low frequency radiation
ばく露装置
ばく露の発生源/構造
  • TV screen (cathode ray tube)
ばく露装置の詳細 Thompson, D 55 cm, 55MxP83, 75 W; eggs or the young chickens were located between 50 and 80 cm from the screen; TV was turned on but covered with a black screen to cut off the light
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 135 nT minimum 測定値 - in extremely low frequency range
磁束密度 270 nT maximum 測定値 - in extremely low frequency range

ばく露4

主たる特性
周波数
  • unspecified
タイプ
  • magnetic field
ばく露時間 continuous for up to 47 days
Additional information computer screen
Additional information whole spectrum of electromagnetic waves including radio frequencies, infrared frequencies, microwaves and X-rays but mostly visible light, very low frequency and extremely low frequency radiation
ばく露装置
ばく露の発生源/構造
  • PC screen (cathode ray tube)
ばく露装置の詳細 Goupil G5 286 10; eggs or the young chickens were located between 50 and 80 cm from the screen, facing the side of the apparatus; screen was turned on but covered with a black screen to cut off the light
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 140 nT minimum 測定値 - in extremely low frequency range
磁束密度 660 nT maximum 測定値 - in extremely low frequency range

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:
調査の時期:
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

Mortality was significantly increased in chicken embryos exposed to a TV or computer screen and it was considerably increased (remark EMF-Portal: probably also significant but not clearly stated) in embryos exposed to the mobile phone with and without gauze compared to the sham exposure groups.
The melatonin level and amount of IgG-type antibodies were significantly increased in chicken embryos exposed to a TV or computer screen compared to the sham exposure groups.
Cancer was not significantly altered in mice with induced tumors exposed to the mobile phone with or without the gauze compared to sham exposed mice with induced tumors. The levels of corticosterone and adrenocorticotropic hormone were significantly reduced in all mice exposed to the mobile phone with or without the gauze compared to sham-exposed mice independently of the presence of tumors.
The authors conclude that exposure of chicken embryos to electromagnetic fields from a TV, computer screen or a 900 MHz mobile phone could increase chicken embryonic mortality and change immunological and hormonal parameters in the blood of chicken and mice.

研究の種別:

研究助成

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