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

[GSM 900 MHzの信号は脳の血流に影響を与えるか?近赤外線分光法(NIRS)による研究] med./bio.

Do GSM 900 MHz signals affect cerebral blood circulation? A near-infrared spectrophotometry study.

掲載誌: Opt Express 2006; 14 (13): 6128-6142

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研究目的(著者による)

To study the effects of GSM 900 MHz signals on the cerebral blood circulation using near-infrared spectrophotometry (NIRS) in 16 healthy volunteers.

詳細情報

NIRS has been well established as a tool to study activity of the brain and e.g. applied to record changes in oxy-hemoglobin and deoxy-hemoglobin concentrations in the visual and motor cortices during functional stimulation. Oxy-hemoglobin and deoxy-hemoglobin are related to cerebral blood flow and cerebral blood volume.
Compared to previous studies using positron emission tomography, NIRS provides a much higher time resolution, which allows investigating the short term effects efficiently, non-invasively, without the use of radioactive tracers and with high sensitivity.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: 15 cycles: 20 s exposure (intermittend 2 s on/2 s off) and 60 s rest (total of 24 min.)
  • SAR: 1.2 W/kg spatial average (10 g)
  • SAR: 12 W/kg spatial average (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 15 cycles: 20 s exposure (intermittend 2 s on/2 s off) and 60 s rest (total of 24 min.)
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • signal generator
ばく露装置の詳細 The antenna was positioned on a location close to the left ear.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.2 W/kg spatial average 計算値 10 g -
SAR 12 W/kg spatial average 計算値 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
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

During exposure (within 20 s) borderline significant short term responses of oxy-hemoglobin and deoxy-hemoglobin concentrations were observed, which correspond to a decrease of cerebral blood flow and cerebral blood volume and were much smaller than regular physiological changes elicited e.g. by functional activation of the brain.
There was no detectable dose-response relation or long term response within 20 minutes.

研究の種別:

研究助成

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