Previous work revealed that millimeter waves (MMW) attenuated the compound action potential (CAP) suppression caused by high-rate electrical stimulation (HRS), but only at certain frequencies of the radiation. The objective of this study was to analyze the frequency dependence of this effect in more detail, as well as to confirm it in an independent series of experiments.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
41.14–41.54 Hz
Modulation type:
CW
Exposure duration:
38 min
|
|
|
Exposure 2:
50.8–51 Hz
Modulation type:
CW
Exposure duration:
38 min
|
|
|
Exposure 3:
45.9–45.93 Hz
Modulation type:
CW
Exposure duration:
38 min
|
|
| Frequency | 41.14–41.54 Hz |
|---|---|
| Type | |
| Exposure duration | 38 min |
| Modulation type | CW |
|---|
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 0.052 m |
| Sham exposure | A sham exposure was conducted. |
| Additional info | For nerve stimulation saline bridge electrodes were positioned on opposite sites of the nerve; the nerve was stimulated with square pulses with a pulse width of 0.2 ms and an amplitude of U = 2 - 5 V; the interval between two pulses in a pair was 9 ms |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 0.27 mW/cm² | maximum | measured and calculated | - | - |
| power density | 0.25 mW/cm² | minimum | measured and calculated | - | - |
| Frequency | 50.8–51 Hz |
|---|---|
| Type | |
| Exposure duration | 38 min |
| Modulation type | CW |
|---|
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 0.052 m |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 0.27 mW/cm² | maximum | measured and calculated | - | - |
| power density | 0.25 mW/cm² | minimum | measured and calculated | - | - |
| Frequency | 45.9–45.93 Hz |
|---|---|
| Type | |
| Exposure duration | 38 min |
| Modulation type | CW |
|---|
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 0.052 m |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 2.5 mW/cm² | minimum | measured and calculated | - | - |
| power density | 2.7 mW/cm² | maximum | measured and calculated | - | - |
Millimeter-wave (MMW) exposure at certain frequencies increased the test-CAP (compound action potential) relative amplitude, or, in other words, irradiation attenuated the HRS (high-rate electrical stimulation)-induced diminution of the test CAP. This effect can be interpreted as an improvement of the nerve refractory properties under the action of MMW.
The results provide evidence for the existence of frequency-specific, resonance-type mechanisms of MMW interaction with biological systems.
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