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

[携帯電話に関連する疾病兆候を持つ患者の心理物理試験と感応] med./bio.

Psychophysiological tests and provocation of subjects with mobile phone related symptoms.

掲載誌: Bioelectromagnetics 2006; 27 (3): 204-214

The detailed summary of this article is not available in your language or incomplete. Would you like to see a complete translation of the summary? Then please contact us →

研究目的(著者による)

To study the effect of exposure to a mobile phone-like radiofrequency electromagnetic field on persons experiencing subjective symptoms when using mobile phones.

詳細情報

20 subjects with mobile phone-related symptoms were recruited and matched with 20 controls without mobile phone-related symptoms.

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: continuous for 30 min
  • SAR: 1 W/kg maximum (1 g)
  • SAR: 0.8 W/kg maximum (10 g)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
ばく露装置
ばく露の発生源/構造
  • アレイ
  • セルラ-電話
  • base station antenna, see chamber and setup details
Distance between exposed object and exposure source 8.5 cm
チャンバの詳細 The provocation experiments were performed in a specially designed exposure chamber where background levels of both power frequency and radio frequency fields were low enough. The subjects were seated in a semi-reclining chair in front of an LCD computer screen. The antennas were mounted on an adjustable wooden framework surrounding the subject's chair. The antennas were placed one on each side of the subject's head at a distance of 8.5 cm. The head was positioned between two wooden bars in order to ensure a well-defined location during the provocation (exposure/sham).
ばく露装置の詳細 A test GSM 900 mobile phone was used as signal generator. The RF signal was power amplified and fed to a power attenuator unit to adjust the signal level. The signal was further directed to a power divider allowing the signal to reach a power meter and the left or right antenna or a dummy load via a remotely controlled selector. Only the right antenna was used for the RF exposure; the left antenna served solely as a dummy.
Additional information The subjects were tested on two separate days, one day with sham exposure and one with true exposure in random order.
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg maximum 測定値 1 g -
SAR 0.8 W/kg maximum 測定値 10 g -

Reference articles

  • Huber R et al. (2003): [ヒトでのラジオ周波電磁界ばく露:脳でのSAR分布の推定、睡眠と心拍への影響]

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)

No significant differences related to radiofrequency exposure conditions were detected. Also no differences in baseline data were observed between the groups, except for the reaction time, which was significantly longer among the subjects with mobile phone-related symptoms (cases) than among the controls the first time the test was performed. This difference disappeared when the test was repeated.
However, the cases differed significantly from the controls with respect to heart rate variability. The cases displayed a shift in low/high frequency ratio towards a sympathetic dominance in the autonomic nervous system during the memory tests and the critical flicker fusion threshold, regardless of exposure condition (a higher activity in the low frequency band, as well as a lower activity in the high frequency band). This might be interpreted as a sign of differences in the autonomic nervous system regulation between persons with mobile phone-related subjective symptoms and persons with no such symptoms.
In conclusion the data do not support the hypothesis that exposure to mobile phone-like radiofrequency fields can explain perceived mobile-phone-attributed symptoms, nor that exposure affects memory functions. However, a difference between the cases and control group with respect to their autonomic nervous system regulation and working memory functions was demonstrated.

研究の種別:

研究助成

関連論文