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

[低レベルの変調マイクロ波刺激によるヒトのEEG変化。] med./bio.

Changes in human EEG caused by low level modulated microwave stimulation.

掲載誌: Bioelectromagnetics 2004; 25 (6): 431-440

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研究目的(著者による)

To study the effects of low level microwave exposure on human EEG alpha and theta rhythms.

詳細情報

The experimental protocol consisted of one cycle of short term photic stimulation and ten cycles of the repetitive microwave stimulation.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 450 MHz
Modulation type: pulsed
ばく露時間: intermittent, 60 s on/60 s off, for 20 min

ばく露1

主たる特性
周波数 450 MHz
タイプ
  • electromagnetic field
ばく露時間 intermittent, 60 s on/60 s off, for 20 min
Modulation
Modulation type pulsed
Duty cycle 50 %
Repetition frequency 7 Hz
ばく露装置
ばく露の発生源/構造
  • quarter-wave antenna (13 cm), RF generator
Distance between exposed object and exposure source 10 cm
チャンバの詳細 The subjects lay in a dark room in a relaxed position, eyes closed and ears blocked.
ばく露装置の詳細 The antenna was located at 10 cm from the skin on the left side of the head.
Sham exposure A sham exposure was conducted.
Additional information Only one EEG recording was performed for a subject per day. Test sessions were single blind, and the exposed and sham exposed subjects were randomly assigned.
パラメータ
測定量 種別 Method Mass 備考
電力密度 0.16 mW/cm² - 測定値 - at the skin
SAR 9.5 mW/kg - 計算値 - in the brain

Reference articles

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)

Low frequency modulated, low level microwave irradiation causes changes in the EEG rhythms' energy level. In the majority of individual cases, these changes are not statistically significant. The alterations caused by photic stimulation as well as microwave stimulation were more regular on the alpha rhythm. In the majority of cases, photic stimulation caused changes in the EEG energy level in the occipital region and microwave stimulation in the frontal region. The data demonstrated that microwave stimulation effects became apparent, starting from the third stimulation cycle. The data allowed to determine the following tendencies: 1) microwave stimulation causes an increase in the variability of the EEG energy level, 2) microwave stimulation causes changes in the frontal region in the majority of the cases, 3) repetitive exposures causes more remarkable changes in the EEG rhythms level than short term irradiation.
The physiological mechanisms underlying these effects are not well understood.

研究の種別:

研究助成

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