To determine if the E-orientation (long axis of body parallel to electric field) versus H-orientation (long axis parallel to magnetic field) effects upon thermal, cardiovascular, and respiratory changes noted at 2450 MHz (see publication 2239) were also present at the resonant frequency of 700 MHz.
*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 | 700 MHz |
|---|---|
| Type | |
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittend 7.2 min +/ 0.5 min exposure - 10.6 min +/- 0.5 min recovery time |
| 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 m |
| Chamber | Eccosorb RF-shield anechoic chamber |
| Setup | Animals placed on a holder which 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) |
| Frequency | 700 MHz |
|---|---|
| Type | |
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittend 7.2 min +/ 0.5 min exposure - 10.6 min +/- 0.5 min recovery time |
| Additional info | Animals were exposed in H.orientation (long axis parallel to magnetic field) |
| Modulation type | CW |
|---|
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 1 m |
In spite of equivalent colonic specific heating rates (SHR) and the reduced E-orientation average SAR, the right subcutaneous, tympanic, and tail SARs, SHRs and absolute temperature increases were significantly greater in E- than in H-orientation. The cooling rate of the animals at all monitoring sites was also significantly greater in E- than in H-orientation. Heart rate and mean arterial blood pressure significantly increased during exposure; however, alterations between orientations were not different. Respiratory rate significantly increased during exposure in H-, but not in E-orientation.
These findings suggest that during resonant frequency irradiation, differences occur in the pattern of heat deposition between E- and H-orientation exposure. When compared with previous studies performed at supraresonant frequencies (e.g. publication 2239), the lower level of cardiovascular change in this investigation was probably related to the lower periphery-to-core thermal gradient.
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