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

[垂直位知覚に対する携帯電話使用の影響] med./bio.

Mobile telephone use effects on perception of verticality.

掲載誌: Bioelectromagnetics 2015; 36 (1): 27-34

この研究は、携帯電話使用の感覚への影響を2つの実験で調べた。《実験1》携帯電話使用後に不定愁訴のある被験者群(n=9)と対照群(n=21)の片耳に携帯電話受話器を固定し、パルス電磁界放射連続波電磁界放射電磁界放射なしの3通りを30分間ばく露し、それぞれ25分後に自覚的視性垂直位/水平位(SVV/SVH)テストを実施した。その結果、ばく露影響はなかったが、SVV/SVHがばく露された耳の反対方向に傾くことが見られた。《実験2》SVV/SVHの傾きの原因が携帯電話の重さにあったか否かを正常被験者群(n=18)で調べた。ベースラインのSVV/SVH測定後、片耳に電源オフの受話器を固定し、25分後に再度SVV/SVHを測定した。その結果、大きなSVV/SVHの変化が見られた;実験2で観察された変化と実験1の連続波ばく露時の変化に有意差はなかった。以上から、観察されたSVV/SVHの変化は、重さによる耳の僅かな傾きか首の筋肉への刺激によると考えられると報告している。

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研究目的(著者による)

The effects of an acute ear exposure of human probands to an 882 MHz electromagnetic field from a mobile phone on graviperception should be investigated.

詳細情報

In the first part of the study, electrosensitive probands (cases, n=9) were compared with persons without subjective complaints (control, n=21). First, all probands were examined without exposure to determine the baseline. Afterwards, each proband was exposed to a continuous signal (CW), pulsed signal (GSM) and sham exposure in random order by strapping a mobile phone to the right and left ear, respectively. This part was conducted on the same day, with the same probands and same exposure conditions as Bamiou et al. 2008. However, the results of the first test indicated an effect of the pure weight of the mobile phone on graviperception. This was checked in a second experiment with solely probands without complaints (n=18) using a turned-off mobile phone.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 882 Hz
Modulation type: CW
ばく露時間: continuous for 2 x 30 minutes (30 minutes per ear)
  • SAR: 1.3 W/kg maximum (10 g) (at antenna, ± 30%)
  • SAR: 0.3 W/kg cf. remarks (10 g) (at mobile body)
ばく露2: 882 Hz
Modulation type: pulsed
ばく露時間: continuous for 2 x 30 minutes (30 minutes per ear)
  • SAR: 0.3 W/kg cf. remarks (10 g) (typical value at mobile body)
  • SAR: 1.3 W/kg maximum (10 g) (at antenna, ± 30%)

ばく露1

主たる特性
周波数 882 Hz
タイプ
  • electromagnetic field
ばく露時間 continuous for 2 x 30 minutes (30 minutes per ear)
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
チャンバの詳細 probands were seated on a chair with chin rest in a dark room in front of the test display
ばく露装置の詳細 exposure system consisted of a headband mounted mobile phone that could emit GSM-modulated signals (GSM-mode) and signals without modulation (continuous signal) with the same mean power and heating of less than 1°C in each mode; mobile phone could be adjusted in either right- or left-handed positions against the head in a geometry simulating a call
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.3 W/kg maximum 測定値 10 g at antenna, ± 30%
SAR 0.3 W/kg cf. remarks 測定値 10 g at mobile body

ばく露2

主たる特性
周波数 882 Hz
タイプ
  • electromagnetic field
ばく露時間 continuous for 2 x 30 minutes (30 minutes per ear)
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
パラメータ
測定量 種別 Method Mass 備考
SAR 0.3 W/kg cf. remarks 測定値 10 g typical value at mobile body
SAR 1.3 W/kg maximum 測定値 10 g at antenna, ± 30%

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:
  • 感覚器
  • graviception
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)

In the first part of the study, no significant differences could be found either between control group and case group (electrosensitive probands) under the different conditions of exposure or between the different exposure conditions and the baseline within each group. However, a significant difference from the baseline depending on the side of the strapped mobile phone was found in all groups and under all conditions of exposure. In the second part of the study, the significant effect of the strapping side of the mobile phone on the test outcome was verified.
The authors conclude that an ear exposure to a 882 MHz electromagnetic field from a mobile phone has probably no effects on graviperception. However, the weight of the mobile phone, which was strapped to either one side of the head in the experiment, can influence the perception of verticality.

研究の種別:

研究助成

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