To study the effects of microwave exposure (continuous wave and pulsed wave) on heat distribution, ECG, arterial blood pressure, and respiratory rate in anesthetized rats. The study was designed to address the issue of possible orientation differences (E orientation (long axis parallel to the electric field) and H orientation (long axis parallel to the magnetic field)), as well as pulsed versus continuous wave irradiation differences, in the same animal.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
2.8 GHz
Modulation type:
CW
Exposure duration:
until temperature rise from 38.5°C to 39.5 °C; once for each exposure orientation (E: 18.7 +-1.3 min; H: 7.1 +-0.4 min)
|
|
|
Exposure 2:
2.8 GHz
Modulation type:
pulsed
Exposure duration:
until temperature rise from 38.5°C to 39.5 °C ; once for each exposure orientation (E: 20.5 +-1.5 min; H: 7.5 +-0.3 min)
|
|
| Frequency | 2.8 GHz |
|---|---|
| Type | |
| Waveform | |
| Charakteristic | |
| Exposure duration | until temperature rise from 38.5°C to 39.5 °C; once for each exposure orientation (E: 18.7 +-1.3 min; H: 7.1 +-0.4 min) |
| Modulation type | CW |
|---|
| Exposure source | |
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| Setup | rats in H- and E-orientation |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 510 W/m² | - | cf. remarks | - | E-orientation |
| power density | 730 W/m² | - | cf. remarks | - | H-orientation |
| SAR | 14 W/kg | mean | cf. remarks | whole body | - |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 510 W/m² | - | cf. remarks | - | E-orientation |
| power density | 730 W/m² | - | cf. remarks | - | H-orientation |
| SAR | 14 W/kg | mean | cf. remarks | whole body | - |
The data revealed no significant difference between the thermal effects of continuous wave and pulsed wave irradiation. The findings showed significant differences between the thermal effects of E- and H-orientation exposure. H-orientation irradiation caused significantly faster colonic temperature increases and, with the exception of the tail, produced significantly greater localized heating in the anesthetized animals, and higher local SAR in rat carcasses than did E-orientation exposure.
Under all irradiation conditions, heart rate and blood pressure increased significantly during exposure and returned to baseline when irradiation was discontinued. Respiratory rate remained unchanged during exposure. There were no significant differences between the effects of E- and H-orientation exposure, or between continuous wave and pulsed wave exposure, upon heart rate, blood pressure, and respiratory rate.
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