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

[LTE電磁界ばく露は安静時EEGのαおよびβバンドを変化させる] med./bio.

Long-Term Evolution electromagnetic fields exposure modulates the resting state EEG on alpha and beta bands

著者: Yang L, Chen Q, Lv B, Wu T
掲載誌: Clin EEG Neurosci 2017; 48 (3): 168-175
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この研究は、LET携帯電話からの最大放射レベルに等価な、安定した放射のLET電磁界（EMF）ばく露システムを用いて被験者へのばく露実験を行い、脳電図（EEG）の変化を調べた。数値シミュレーションを行って、被験者の頭部の比吸収率が安全限度値を下回ることを確実にした。その結果、ばく露による影響として、前頭葉および側頭葉でのαおよびβバンドにおいて、スペクトルパワーおよび大脳半球間コヒーレンスの低下が見られた、と報告している。

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研究目的（著者による）

The effects of exposure to 2.61 GHz electromagnetic field (LTE) on the human EEG should be investigated.

詳細情報

The results of a previous study on brain activity by the authors (Lv et al. 2014) should be confirmed using another method.
25 healthy male volunteers participated in 2 sessions, which were separated by 1 week. Each session lasted 50 minutes and comprised 5 time slots at 10 minutes. In the first (pre-exposure) and last slot (post-exposure), EEG was always measured without EMF exposure. The 3 intermediate slots were either used for EMF exposure in one random session or for sham exposure in the other.
All subjects were moderate mobile phone users (voice communication for less than 30 minutes per day) and none used a mobile phone for more than 10 minutes during the day prior to the experiments.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 2.61 GHz
ばく露時間: continuous for 30 minutes
  • SAR: 1.34 W/kg peak (10 g) (with electrodes)
  • SAR: 1.96 W/kg peak (1 g) (with electrodes)
  • 電力: 0.25 W peak (power delivered to the dipole antenna)

ばく露1

主たる特性
周波数 2.61 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 minutes
Additional information LTE
Modulation
Modulation type cf. additional information
Additional information

applied radio frame (10-ms total length) consisted of 2 half-frames of equal length; each half-frame comprised 5 subframes, each 1 ms in length; maximum emission configuration was used (6 uplink subframes in the radio frame); radiation duration (including the uplink subframes and uplink pilot time slot special subframes) accounted for 63.3% of the total length of the frame
ばく露装置
ばく露の発生源／構造
Distance between exposed object and exposure source 1 cm
ばく露装置の詳細 subjects were in sitting position with eyes closed; plastic spacer of 1 cm was used to maintain the distance between the right ear and a standard dipole
Sham exposure A sham exposure was conducted.
Additional information right ear was exposed because subjects were assumed to be right-hand dominant
パラメータ
測定量 値 種別 Method Mass 備考
SAR 1.34 W/kg peak 計算値 10 g with electrodes
SAR 1.96 W/kg peak 計算値 1 g with electrodes
電力 0.25 W peak - - power delivered to the dipole antenna
Additional parameter details

power delivered to the dipole was equivalent to a theoretical maximum emission by an LTE terminal and below the current safety limit; according to simulated SAR values, the maximum resultant temperature increase was not more than 0.1°C

測定および計算の詳細

SAR was simulated using a human head model with and without EEG electrodes

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:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム（著者による）

Exposure to the electromagnetic field significantly reduced the power and inter-hemispheric coherence of alpha waves and beta waves in the frontal and temporal brain regions during and after exposure in comparison to the sham exposure and compared to the pre-exposure condition. No significant change was observed in the power or the inter-hemispheric coherence of brain waves in different time slots during and after the exposure.
Results for delta waves and theta waves were not presented.
The authors conclude that exposure to a 2.61 GHz electromagnetic field (LTE) might modulate alpha waves and beta waves in the human EEG, supporting previous results.

研究の種別:

研究助成

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