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

[無線周波数電磁放射下のオペレータにおける心臓血管系のリスク] med./bio.

Cardiovascular risk in operators under radiofrequency electromagnetic radiation

著者: Vangelova K, Deyanov C, Israel M
掲載誌: Int J Hyg Environ Health 2006; 209 (2): 133-138
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この研究は、心臓血管系に対する高周波電磁放射（EMR）の長期的な影響を評価することを目的として、放送局およびテレビ局のオペレータを対象に健康調査を実施した。EMRばく露群として、放送（BC）局オペレータ群（n = 49）およびテレビ局オペレータ群（n =61）の２群を設定し、対照群として、無線中継局オペレータ群（n =110）を設定した。EMRばく露が評価され、時間加重平均（TWA）が算出された。心臓血管リスク因子として、動脈圧、脂質プロファイル、ボディマス指数、ウエスト/ヒップ比、喫煙歴、および心血管疾患の家族歴を調査した。その結果、収縮期および拡張期血圧（SBPおよびDBP）、総コレステロール（TC）および低密度リポタンパク質コレステロール（LDL-C）が、2つのばく露群で有意に高かった；無線周波EMRばく露は、高血圧および脂質異常症になる確率が高いことと関連することが示された；逐次重回帰式は、SBPとTWAがTCの高値とLDL-Cの高値の予測因子、TC、年齢、腹部肥満がSBPとDBPの高値の予測因子であることを示した、と報告している。

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研究目的（著者による）

To assess the long-term effects of radiofrequency electromagnetic irradiation on the cardiovascular system.

詳細情報

Two groups of exposed operators (49 broadcasting station and 61 TV station operators) and a control group of 110 radiorelay station operators were studied. Electromagnetic irradiation was assessed and the time-weighted average was calculated.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 6–25 MHz
ばく露時間: 20.7 ± 5.5 years (average length of service)
broadcasting station
-
ばく露2: 66–900 MHz
ばく露時間: 18.6 ± 8.9 years (average length of service)
TV station
-

ばく露1

主たる特性
周波数 6–25 MHz
タイプ
  • electromagnetic field
ばく露時間 20.7 ± 5.5 years (average length of service)
Additional information broadcasting station
Modulation
Modulation type unspecified
ばく露装置
ばく露の発生源／構造
  • radiofrequency transmitter at broadcast station
Additional information Investigated subjects worked at the broadcasting station and had the task of monitoring, controlling and registering the parameters of emissions of radiofrequency transmitters. Control subjects consisted of operators (average length of service 24.2 ± 9.6 years) from relay radio station who monitored and controlled input and output signals.
パラメータ

No parameters are specified for this exposure.

Additional parameter details

Mean measured values of electric field intensities at the work site ranged from 333.73 (V/m)²h to 342.79 (V/m)²h (hour) and the maximum ranged from 1644 to 10336 (V/m)²h (duration of stay not more than 15 to 20 min). Mean and maximum time weighted averaged for each person at different sites and duration of stay were in the range of 3.1 to 3.96 µW/cm²h and 66.9 to 137 µW/cm²h, respectively.

測定および計算の詳細

Electric field intensities and magnetic flux densities were measured at typical constant and temporal work places

ばく露2

主たる特性
周波数 66–900 MHz
タイプ
  • electromagnetic field
ばく露時間 18.6 ± 8.9 years (average length of service)
Additional information TV station
Modulation
Modulation type unspecified
ばく露装置
ばく露の発生源／構造
  • E1と同じ装置
  • radiofrequency transmitter at TV station
Additional information Investigated subjects worked at the TV station and had the task as the subjects in E1. They were compared to the control group as described in E1.
パラメータ

No parameters are specified for this exposure.

Additional parameter details

Mean measured values of electric field intensities at the work site ranged from 14.26 to 45.30 µW/cm²h and the maximum ranged from 15.37 to 125.75 µW/cm²h. Mean and maximum time weighted averaged for each person at different sites and duration of stay were in the range of 1.19 to 1.89 µW/cm²h and 1.28 to 5.24 µW/cm²h, respectively.

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:
  • ばく露中

研究の主なアウトカム（著者による）

The systolic and diastolic blood pressure, total cholesterol and low-density lipoprotein cholesterol were significantly higher in the two exposed groups. It was revealed that the radiofrequency electromagnetic field exposure was associated with greater chance of becoming hypertensive and dyslipidemic.
The regression analysis suggests the total cholesterol, age and waist/hip ratio as predictors for the high systolic blood pressure and diastolic blood pressure and the systolic blood pressure and time-weighted average as predictors for high total cholesterol and low density lipoprotein cholesterol.
The results show that the radiofrequency electromagnetic field irradiation contributes to adverse effects on the cardiovascular system.

研究の種別:

研究助成

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