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

[IMT-2000携帯電話用の1.95GHz W-CDMAのラット精巣への影響] med./bio.

Effects on rat testis of 1.95-GHz W-CDMA for IMT-2000 cellular phones.

掲載誌: Syst Biol Reprod Med 2011; 57 (4): 204-209

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研究目的(著者による)

To study the effects of whole body exposure to 1.95 GHz on rat testes.

詳細情報

Five week old animals were divided into three groups of 24 each and exposed for five weeks (from the age of 5 to 10 weeks, corresponding to reproductive maturation in the rat).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.95 GHz
Modulation type: CW
ばく露時間: continuous for 5 h/day, 7 days/week during 5 weeks
  • SAR: 0.08 W/kg (group ii)
  • SAR: 0.4 W/kg (group iii)

General information

rats were treated in three groups: i) sham exposure ii) low level EMF exposure iii) high level EMF exposure

ばく露1

主たる特性
周波数 1.95 GHz
タイプ
  • electromagnetic field
偏波
  • circular
ばく露時間 continuous for 5 h/day, 7 days/week during 5 weeks
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • 3/2 wavelength dipole antennas
ばく露装置の詳細 90 cm x 90 cm x 40 cm exposure boxes with inside dimensions of 70 cm x 70 cm x 34 cm covered on the inside with 6 cm thick planar RF absorbers, except for the ceiling, which was made of metal mesh and covered with a 4.2 mm thick translucent acrylic plate; a turntable covered with a 2 mm thick reflector plate was placed inside the box, with which the EMF exposure to the front side including the testis was increased; four 200 mm x 190 mm acrylic cages, housing 1 rat each, cylindrically arranged in the exposure chamber; two antennas covered with a ABS resin cap, crossing at a right angle and with a spacing of 40 mm hanging from the ceiling in the center of the exposure box
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
SAR 0.08 W/kg - 計算値 whole body group ii
SAR 0.4 W/kg - 計算値 whole body group iii

Reference articles

  • Takahashi S et al. (2010): [ラット胎児に対する携帯電話電磁界全身ばく露の悪影響なし]
  • Ogawa K et al. (2009): [IMT-2000携帯電話の1.95GHz W-CDMA信号に対する妊娠中のばく露の影響:ラットにおいて胎児毒性および催奇形性は見られず]
  • Wang J et al. (2008): [非制限妊娠と新生児ラット2GHZ全身暴露のドシメトリ分析]
  • Wake K et al. (2007): [1.5 GHz携帯電話の長期大規模動物バイオアッセイのためのばく露装置]
  • Shirai T et al. (2007): [IMT-2000携帯電話システムの1.95- GHz W-CDMAシグナルへの慢性ばく露はF344ラットのN-エチルニトロソ尿素誘発中枢神経系腫瘍のプロモーション効果を示さない]

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:
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)

There were no differences in body weight gain or weights of the testis, epididymis, seminal vesicles, and prostate among the groups. The number of sperms in the testis and epididymis were not decreased in the electromagnetic field exposed groups. The testicular sperm count was even significantly increased with the 0.4 W/kg SAR. Abnormalities of sperm motility or morphology and the histological appearance of seminiferous tubules, including the stage of the spermatogenic cycle, were not found.
In conclusion, under the present exposure conditions no testicular toxicity was evident.

研究の種別:

研究助成

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