この研究は、高周波電磁放射（EMR）の下で、長期にわたり頻繁な輪番性の勤務で働いているオペレータにおける、6スルファトキシメラトニンと3つのストレスホルモンの尿中レベルの１日の時刻による変動を調査した。調査に参加した36人の男性は、ばく露群（放送局オペレータ12人、テレビ局オペレータ12人）と対照群（衛星放送局オペレータ12人）から成る。放射免疫測定法と蛍光分光法によって、4時間間隔でホルモンの排泄速度をモニタした。各オペレータのEMRばく露の時間加重平均（TWA）のグループ別の平均および最大値は、放送局オペレータ群では3.10 μW / cm2および137.00 μW / cm2と高ばく露、テレビ局オペレータ群では1.89 μW / cm2および5.24 μW / cm2）と低ばく露、衛星放送局オペレータ群では非常に低かった。結果として、高周波EMRは、6-スルファトキシメラトニンの典型的な日周パターンに影響を与えなかった；高ばく露群では、コルチゾール（p <0.001）、アドレナリン（p = 0.028）、ノルアドレナリン（p <0.000）の排泄速度が有意に高かった；低ばく露群では、これらの変化は有意に達しなかった；コルチゾールおよびノルアドレナリンの24時間排泄は、TWAの平均および最大値と相関していた、と報告している。
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To study the time-of-day variations in urinary levels of 6-sulphatoxy melatonin and three stress hormones in operators working fast-rotating extended shifts (16 to 18 h with a 24 h-stay in the station (9:00 to 9:00) followed by 3 days off) under radiofrequency electromagnetic radiation.
The excretion rate of the hormones was monitored at 4-hour intervals in a group of 36 male operators comprising 12 broadcasting station operators (high level of exposure), 12 TV station operators (low-level of exposure), and a control group of 12 satellite station operators (very low level of exposure).
This study is a part of complex investigation of the health risk assessment of occupational radiofrequency electromagnetic irradiation exposure (National Center of Hygiene, Medical Ecology and Nutrition, Report No 2.1/0.1: Assessment of the effect of low-level radiofrequency EMR on secretion of melatonin, the level of stress hormones and cardiovascular system. National Center of Hygiene, Medical Ecology and Nutrition, Sofia, Bulgaria, 2003; 1-128.).
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
6–25 MHz
ばく露時間:
repeated exposure for 1 day on and 3 days off
|
|
|
ばく露2:
66.5–900 MHz
ばく露時間:
repeated exposure for 1 day on and 3 days off
|
|
|
ばく露3:
5.85–6.245 GHz
ばく露時間:
repeated exposure for 1 day on and 3 days off
|
| 周波数 | 6–25 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | repeated exposure for 1 day on and 3 days off |
| ばく露の発生源／構造 |
|
|---|---|
| ばく露装置の詳細 | Three groups of 12 operators each were investigated working fast-rotating extended shifts in three telecommunication stations, i.e., a broadcasting (BC) station, a TV station and a satellite (SAT) station, respectively. The operators from the three groups worked a 4-day cycle schedule: one extended shift (16 to 18 h) with a 24-h stay in the station, followed by 3 days off. |
| Additional information | From the measurements and calculations, it was concluded that the level of exposure of BC station operators was high, whereas that of TV and SAT station operators was low, the lowest in SAT operators. The latter group was used as a control because no other suitable group could be found in terms of shift system and job characteristics. |
Radiofrequency electromagnetic irradiation had no effect on the typical diurnal pattern of 6-sulphatoxy melatonin. High-level radiofrequency electromagnetic irradiation exposure significantly increased the excretion rates of cortisol, adrenaline, and noradrenaline, whereas changes under low-level exposure did not reach significance.
In conclusion, the excretion of 6-sulphatoxy melatonin retained a typical diurnal pattern under extended shifts and radiofrequency electromagnetic irradiation, but showed an exposure-effect relation with stress hormones.
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