この研究は、9.3GHz高周波電磁界放射（RFR）連続波の遠方界ばく露をケタミン麻酔したラットに与え、体温、心臓血管系および呼吸の変化への影響が電界および磁界（EおよびH）の方向により変わるか否かを調べた。1℃の結腸温度変化（38. 5℃から39.5℃へ）を生じさせるために、SAR= 12.5W / kg（EおよびHの両方向）、電力密度79 mW / cm 2（E方向）および59mW / cm 2（H方向）の照射を行った。実験中、動脈血圧、呼吸数、結腸温（Tc）鼓膜温（Tt）左右皮下温（TslおよびTsr）（RFR源に向かう側および離れた側）および尾部温（Tta）が連続的に記録された。その結果、E方向ばく露中のTsr変化は、Tc変化よりもかなり小さかった；H方向ばく露中のTtおよびTsr変化はTc上昇に近似した；両方向ばく露中は、TslとTtaの変化はTc上昇よりもかなり大きかった、などの知見を報告している。
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The aim of this study was to determine the effects of exposure orientation relative to electric and magnetic fields (E (long axis of body parallel to electric field)- and H (long axis of body parallel to magnetic field)-orientation) on the thermal, cardiovascular, and respiratory changes in anesthetized rats exposed to continuous wave 9.3 GHz radiofrequency irradiation.
*The exposure was discontinued when the colonic temperature increased to 39.5°C and it was initiated again when the temperature returned to 38.5°C. This procedure was continued for 3 cycles.
| 周波数 | 9.3 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| 偏波 |
|
| ばく露時間 | intermittent* |
| Additional information | Animals were exposed in E-orientation (long axis parallel to electric field) |
| Modulation type | CW |
|---|
| ばく露の発生源／構造 | |
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| チャンバの詳細 | Eccosorb RF-shielded anechoic chamber |
| ばく露装置の詳細 | Rats placed on a holder |
| Additional information | The holder consisted of seven 0.5 cm (O.D) Plexiglas rods mounted in a semicircular pattern on 4 cm x 6 cm Plexiglas plates (0.5 cm thick). Colonic rise and recovery time were 15.2 ± 0.8 min and 24.4 ± 1.3 min respectively. |
| 周波数 | 9.3 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| 偏波 |
|
| ばく露時間 | intermittent* |
| Additional information | Animals were exposed in H-orientation (long axis parallel to magnetic field) |
| Modulation type | CW |
|---|
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| Additional information | Colonic rise and recovery time were 15.0 ± 0.9 min and 26.0 ± 2.3 min respectively. |
The right subcutaneous temperature change during E-orientation irradiation was considerably less than the colonic temperature change. The tympanic temperature and right subcutaneous temperature (H-orientation) alterations approximated the colonic temperature increase. The subcutaneous left temperature and tail temperature changes (both orientations) were considerably greater than the colonic temperature increase. The tympanic temperature and subcutaneous left temperature increases were virtually equal under the two irradiation conditions; however, the subcutaneous right temperature increase was significantly greater during H-orientation exposure, and the tail temperature increase was significantly greater during E-orientation irradiation.
Heart rate and mean arterial pressure increased significantly during exposure; however the cardiovascular responses were not affected by irradiation orientation.
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