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

[異なるEMF条件下でのEEGのスペクトルパワーコヒーレンス] med./bio.

The spectral power coherence of the EEG under different EMF conditions.

掲載誌: Neurosci Lett 2008; 441 (2): 188-192

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研究目的(著者による)

To study the effect of different electromagnetic field conditions (900 MHz and 1800 MHz) on the brain activity of men and women.

詳細情報

Previous investigations showed gender-related differences on the EEG during 900 MHz exposure (Papageorgiou et al. 2004) and during 1800 MHz exposure (Nanou et al. 2009).
In the present study (based on the previous data) spectral power coherence was calculated. Spectral power coherence is a measurement parameter that describes whether the EEG energy at a specific location of the brain is distributed among the different frequency bands (delta waves, theta waves, alpha waves, and beta waves) in a coordinated manner (i.e. whether subjects that have higher energy values in one frequency band should be anticipated to have higher energy values in the other frequency bands as well).
Two different groups took part in two separate experiments (900 MHz and 1800 MHz): group 1 consisted of 9 men and 10 women, group 2 consisted of 10 healthy men and 10 healthy women. The subjects performed the memory tests twice (exposed and sham-exposed) with an interval of two weeks.

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: 45 min
ばく露2: 1,800 MHz
ばく露時間: 45 min

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 45 min
ばく露装置
ばく露の発生源/構造
チャンバの詳細 Faraday room
ばく露装置の詳細 antenna fixed at a distance of 20 cm near the right ear
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電力 64 mW mean - - -

ばく露2

主たる特性
周波数 1,800 MHz
タイプ
  • electromagnetic field
ばく露時間 45 min
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電力 128 mW mean - - -

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

研究の主なアウトカム(著者による)

The results showed that the energy of the delta waves of the EEG did not vary between subjects in such a consistent manner as the energies of the other three EEG frequency bands.
Furthermore, the effect of exposure on the spectral power coherence of the three EEG frequency bands (theta waves, alpha waves, and beta waves) was different for the two genders. The spectral power coherence of males was the same at sham exposure and 900 MHz exposure, but showed a significant drop at 1800 MHz. At the same time females displayed a significant increase of the spectral power coherence at 900 MHz exposure compared to the sham exposure, however no further increase at 1800 MHz exposure.
In comparison of the genders males exhibited a significant higher consistency between the three EEG frequency bands than females at sham exposure, this difference between the genders disappeared at 900 MHz exposure. At 1800 MHz exposure females showed a significant higher consistency than males.
In conclusion, the data showed that the electromagnetic field exposure influenced the spectral power coherence of the EEG and this effect was gender dependend.

研究の種別:

研究助成

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