The effect of low level amplitude modulated radiofrequency radiation is examined on sodium potassium ATPase (Na+-K+-ATPase) activity in the developing rat brain.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
147 MHz
Modulation type:
AM
Exposure duration:
20-60 min for short duration exposure or 3 h/day for 30-35 days
|
|
|
Exposure 2:
73.5 MHz
Modulation type:
AM
Exposure duration:
20-60 min for short duration exposure or 3 h/day for 30-35 days
|
|
|
Exposure 3:
36.75 MHz
Modulation type:
AM
Exposure duration:
20-60 min for short duration exposure or 3 h/day for 30-35 days
|
|
| Frequency | 147 MHz |
|---|---|
| Type | |
| Exposure duration | 20-60 min for short duration exposure or 3 h/day for 30-35 days |
| Modulation type | AM |
|---|---|
| Modulation frequency | 16–76 Hz |
| Additional info |
80-90% modulation depth |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 9.65 mW/g | mean | cf. remarks | cf. remarks | 6.11 W/kg |
| power density | 14.7 W/m² | mean | cf. remarks | - | - |
| Frequency | 73.5 MHz |
|---|---|
| Type | |
| Exposure duration | 20-60 min for short duration exposure or 3 h/day for 30-35 days |
| Modulation type | AM |
|---|---|
| Modulation frequency | 16–76 Hz |
| Additional info |
80-90% modulation depth |
| Exposure source | |
|---|---|
| Additional info | same as in exposition 1 |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 9.65 mW/g | mean | cf. remarks | cf. remarks | 6.11 W/kg |
| power density | 14.7 W/m² | mean | cf. remarks | - | - |
| Frequency | 36.75 MHz |
|---|---|
| Type | |
| Exposure duration | 20-60 min for short duration exposure or 3 h/day for 30-35 days |
| Modulation type | AM |
|---|---|
| Modulation frequency | 16–76 Hz |
| Additional info |
80-90% modulation depth |
| Exposure source | |
|---|---|
| Additional info | same as in exposition 1 |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 9.65 mW/g | mean | cf. remarks | cf. remarks | 6.11 W/kg |
| power density | 14.7 W/m² | mean | cf. remarks | - | - |
The results show a significant increase of sodium potassium ATPase (Na+-K+-ATPase) activities in chronically exposed rat brains compared to control ones. With the irradiated groups, the data show relatively higher activities of Na+-K+-ATPase in rat brain exposed to different carrier wave frequencies amplitude modulated at 16 Hz compared to animals brain chronically exposed to same set of carrier wave frequencies AM at 76 Hz. However, the difference is statistically insignificant.
The increase in Na+-K+-ATPase activity in animals chronically exposed to AM at 16 and 76 Hz, respectively was independent of carrier wave frequencies.
Brain membranes from various irradiated groups were again exposed in vitro to their respective fields for 20-60 min and Na+-K+-ATPase activity was determined in each group. No statistically significant effect on enzyme activity was observed.
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