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

[ヒト精液に対する携帯電話RF電磁界の影響:インビトロのパイロット研究] med./bio.

Effects of radiofrequency electromagnetic waves (RF-EMW) from cellular phones on human ejaculated semen: an in vitro pilot study.

掲載誌: Fertil Steril 2009; 92 (4): 1318-1325

【目的】携帯電話会話モード中のRF電磁波(RF-EMW)が射精させた未処理精液に与える影響を調べること。【方法】健常ドナー(n=23)および不妊患者(n=9)の精液標本は液化後、二つの部分標本に分けられた。一方はばく露用とし、他方は対照として一定の条件で保存された。ばく露携帯電話の会話モードで1時間行われた。主な評価項目は、精子パラメタ(運動率、生存率)、活性酸素種ROS)、全抗酸化力(TAC)、ROS-TACスコア、精子DNA損傷とした。【結果】RF-EMFばく露群は、精子の運動率および生存率の著しい低下、ROSレベルの上昇、ROS-TACスコアの低下を示した。TACレベルおよびDNA損傷には、対照群との大きな違いは見られなかった。【結論】携帯電話放射する無線周波電磁波はヒト精液酸化ストレスを生じる可能性がある。

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研究目的(著者による)

To study the effects of mobile phone radiofrequency electromagnetic fields during talk mode on unprocessed (neat) ejaculated human semen.

詳細情報

Semen samples from normal healthy donors (n=23) and infertile patients (n=9) were used. Semen samples were divided into two aliquots (for exposure and sham exposure). Analysis were performed between overall exposed and unexposed samples as well as separately in patient and donor samples.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 850 MHz
Modulation type: pulsed
ばく露時間: continuous for 60 min

ばく露1

主たる特性
周波数 850 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 60 min
Modulation
Modulation type pulsed
Additional information

GSM in talk mode

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
Distance between exposed object and exposure source 2.5 cm
チャンバの詳細 Both samples (aliquots) were kept at room temperature.
ばく露装置の詳細 The mobile phone had a loop-shaped, omni-directional antenna on the top of its back that was kept at 2.5 cm from each sample.
Sham exposure A sham exposure was conducted.
Additional information Unexposed (control) aliquots were kept under identical conditions but without RF exposure [Oktem et al., 2005].
パラメータ
測定量 種別 Method Mass 備考
電力 1 W maximum - - -
電力密度 40 µW/cm² maximum 測定値 - 1-40 µW/cm²
SAR 1.46 W/kg maximum - - -

Reference articles

  • Oktem F et al. (2005): [900 MHzの携帯電話によって誘導される腎臓における酸化的防護:メラトニンによる防護]

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:

研究の主なアウトカム(著者による)

Exposed samples showed a significant decrease in sperm motility and viability, an increase in reactive oxygen species level (in all groups: overall, normal donors, patients), and decrease in "reactive oxygen species - total antioxidant capacity" score (however, the score was not significant when comparing exposed and unexposed samples from donors and patients). Levels of total antioxidant capacity and DNA damage showed no significant differences from the unexposed group.
In conclusion, radiofrequency electromagnetic fields emitted from mobile phones may lead to oxidative stress in human semen. The authors speculate that keeping the cell phone in a trouser pocket in talk mode (e.g. while using Bluetooth) may negatively affect spermatozoa and impair male fertility. However, the cell phone and the male reproductive organs are separated by multiple tissue layers, so to extrapolate the effects seen under in vitro conditions to real-life conditions requires further studies.

研究の種別:

研究助成

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