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

[聴性脳幹反応に対する携帯電話電磁界の影響無し] med./bio.

No effects of mobile phone electromagnetic field on auditory brainstem response.

掲載誌: Bioelectromagnetics 2010; 31 (1): 48-55

このボランティア実験は、健康な17名の若い成人を対象に、聴性脳幹反応に対する携帯電話電磁界(902.4MHzの217Hzパルス)の影響を調べた。3つの条件(携帯電話無しの状態(基準)、携帯電話を耳に当てEMFオン、同オフ)で聴性脳幹反応を記録した。その結果、聴性脳幹反応の主要成分(I, III, V波)の振幅潜時、波間間隔に目立った変化は見られなかったと報告している。

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研究目的(著者による)

To study the possible effects of the electromagnetic fields emitted by an GSM mobile phone on brainstem auditory processing in 17 healthy young adults.

詳細情報

Auditory brainstem response (ABR) was recorded first without a mobile phone at baseline, and then under real exposure and sham exposure in a counterbalanced order. During exposure/sham exposure, the mobile phone was placed directly on the ears, one ear at a time.

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: 5 min sessions for 1 h
  • SAR: 1.14 W/kg average over mass (1 g)
  • SAR: 0.82 W/kg average over mass (10 g)

General information

experiments were conducted under three conditions: i) baseline = auditory stimuli only ii) auditory stimuli + mobile phone on the stimulated ear on iii) auditory stimuli + mobile phone on the stimulated ear off

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 5 min sessions for 1 h
Modulation
Modulation type pulsed
Pulse width 0.58 µs
Repetition frequency 217 Hz
Additional information

additional auditory stimuli (clicks) with a rate of 10.3 HZ and a duration of 100 µs

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
ばく露装置の詳細 tubal insert phone electrodes inserted into the ear canals of the subjects, three Ag-AgCl-electrodes (1 ground, 2 reference) attached to the forehaed, mobile phone placed directly on the ear; additional auditory stimuli conducted through thin flexible silicon tubes and polyurethane foam eartips wrapped in thin gold foil
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.14 W/kg average over mass 測定値および計算値 1 g -
SAR 0.82 W/kg average over mass 測定値および計算値 10 g -

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]

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

研究の主なアウトカム(著者による)

Auditory brainstem response waveforms showed no significant differences due to exposure, suggesting that short-term exposure to mobile phone electromagnetic fields did not affect the transmission of sensory stimuli from the cochlea up to the midbrain along the auditory nerve and brainstem auditory pathways.

研究の種別:

研究助成

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