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.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
9.3 GHz
Modulation type:
CW
Exposure duration:
intermittent*
|
|
|
Exposure 2:
9.3 GHz
Modulation type:
CW
Exposure duration:
intermittent*
|
|
*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.
| Frequency | 9.3 GHz |
|---|---|
| Type | |
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittent* |
| Additional info | Animals were exposed in E-orientation (long axis parallel to electric field) |
| Modulation type | CW |
|---|
| Exposure source | |
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| Chamber | Eccosorb RF-shielded anechoic chamber |
| Setup | Rats placed on a holder |
| Additional info | 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. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 790 W/m² | unspecified | measured | - | - |
| SAR | 12.5 mW/g | mean | - | whole body | - |
| Frequency | 9.3 GHz |
|---|---|
| Type | |
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittent* |
| Additional info | Animals were exposed in H-orientation (long axis parallel to magnetic field) |
| Modulation type | CW |
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 12.5 mW/g | mean | - | whole body | - |
| power density | 590 W/m² | unspecified | measured | - | H orientation. |
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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