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

[携帯電話電磁界は若年被験者より高齢被験者の脳電図αリズムの脳半球間機能的カップリングを変調させる] med./bio.

Mobile phone emission modulates inter-hemispheric functional coupling of EEG alpha rhythms in elderly compared to young subjects.

掲載誌: Clin Neurophysiol 2010; 121 (2): 163-171

著者は以前に、ヒトの脳電図に対する携帯電話GSM電磁界への長時間ばく露(45分間)の影響として、側頭および前頭の安静時脳電図リズムの脳半球同期変調を若年被験者について報告した。今回は、前回と同じ条件で健康な高齢被験者16名と若年被験者5名の脳電図を、ばく露時および擬似ばく露時の2回記録した。高齢者群16名と若齢者群15名(前回実験の10名のデータと今回の5名のデータ)について、α、θ、δ帯域における脳電図リズムの脳半球同期の程度を表すスペクトラムコヒーレンスを比較した結果、ばく露時のα帯におけるコヒーレンスが若齢者群より高齢者群で有意に増加するなど、加齢による差異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)

In a previous study (Vecchio et al. 2007) it has been reported that GSM electromagnetic fields of a mobile phone modulate inter-hemispheric synchronization (an important physiological feature of information transfer into the brain) of temporal and frontal resting EEG rhythms in normal young subjects.
In the present study, the authors tested the hypothesis that this effect can vary with physiological aging as a sign of changes in the functional organization of cortical neural synchronization.

詳細情報

Eyes-closed resting EEG data were recorded in 16 healthy elderly subjects (60.75 ± 2.87 years) and 5 young subjects (30 ± 1.26 years) in the same two conditions of the previous study (GSM device was turned on (45 min) in one condition and was turned off (45 min) in the other condition). The aging effects were investigated comparing the inter-hemispheric EEG coherence in the elderly subjects vs. a young group formed by 15 young subjects (including 10 young subjects of the previous study).
Individual EEG rhythms of interest were delta waves (about 2-4 Hz), theta waves (about 4-6 Hz), alpha wave 1 (about 6-8 Hz), alpha wave 2 (about 8-10 Hz) and alpha wave 3 (about 10-12 Hz).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902.4 MHz
Modulation type: pulsed
ばく露時間: continuous for 45 min
  • 電力: 2 W peak
  • 電力: 0.25 W average over time
  • SAR: 0.5 W/kg maximum (brain)

ばく露1

主たる特性
周波数 902.4 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 45 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
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 1.5 cm
ばく露装置の詳細 commercially available standard phone positioned on the left side next to the ear by a modified helmet; another phone, which was switched off, was on the right side; antenna placed in the parieto-tempoaral area about 4 cm from the head
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 0.25 W average over time - - -
SAR 0.5 W/kg maximum 測定値 brain -

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
  • ばく露後

研究の主なアウトカム(著者による)

Compared with the young subjects, the elderly subjects showed a statistically significant increment of the inter-hemispheric coherence of frontal and temporal alpha wave rhythms (about 8-12 Hz) during the GSM condition. In conclusion, these data suggest that GSM electromagnetic fields of a mobile phone affect inter-hemispheric synchronization of the dominant (alpha wave) EEG rhythms as a function of the physiological aging. This study provides further evidence that physiological aging is related to changes in the functional organization of cortical neural synchronization.

研究の種別:

研究助成

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