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

[ヒトの脳波α波に対する携帯電話電磁界の影響] med./bio.

The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram.

掲載誌: Bioelectromagnetics 2008; 29 (1): 1-10

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研究目的(著者による)

The study was designed to provide a methodologically rigorous test of the hypothesis that mobile phone-exposure increases alpha wave power in the EEG, by employing similar methodologies to Curcio et al. (publication 12357 ), but with a substantially larger sample size.

詳細情報

120 subjects were tested in awake resting position.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 895 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • 電力: 2 W peak
  • 電力: 0.25 W mean
  • SAR: 0.674 W/kg maximum (10 g) (high on the cheek bone, midway between the auricle and temple)
  • SAR: 0.11 W/kg maximum (10 g) (in-line with the antenna, approx. over the temporal lobe)

General information

Participants attended two sessions one week apart with a double blind, counterbalanced (left vs. right hemisphere exposure, between subjects), crossover (sham vs. active) design.

ばく露1

主たる特性
周波数 895 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 576 µs
Duty cycle 12.5 %
Repetition frequency 217 Hz
Additional information

GSM without discontinuous transmission (DTX) and adaptive power control (APC) with frequencies of 16 and 217 Hz detected using a pick-up coil at the back of the handset [Andersen and Pedersen, 1997]

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • continuous transmission
チャンバの詳細 The participants were seated in a comfortable chair, 1.5 m in front of a computer monitor.
ばく露装置の詳細 The phone was placed in a cradle over the EEG recording cap, over the right or left temporal region (each for half the subjects), comparable to normal use (in "touch" position according to FCC Guidelines, 2001).
Sham exposure A sham exposure was conducted.
Additional information The handset's audio circuitry was disabled, and padding was placed between the handset and its leather casing to avoid acoustic and thermal cues. The used type of EEG recording cap did not display any EMF pickup within the physiologically important range relevant to this study (0.5-45 Hz) [Wood et al., 2003].
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 0.25 W mean - - -
SAR 0.674 W/kg maximum 測定値 10 g high on the cheek bone, midway between the auricle and temple
SAR 0.11 W/kg maximum 測定値 10 g in-line with the antenna, approx. over the temporal lobe

Reference articles

  • Hamblin DL et al. (2007): [EEG電極キャップはGSM900の携帯電話によって頭部にもたらされるSARを減少させる]
  • Wood AW et al. (2003): [脳電図電極リード線による携帯電話の直接的ピックアップの可能性を評価するための「ファントム頭皮」の使用]
  • Andersen JB et al. (1997): [総説:リスク評価で問題とされる携帯電話システムの技術]

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)

The study has replicated previous data of mobile phone-related increases in resting alpha wave, and thus adds strength to the argument at which there are mobile phone-related bioeffects at the low levels that mobile phones operate.
Although the functional significance of this alpha wave change cannot be determined at present, it should be pointed out that alpha wave changes of the magnitude reported in this investigation have not been found to relate to health outcomes, either positive or negative.

研究の種別:

研究助成

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