(1) To test the response to exposure to an extremely low frequency pulsed electromagnetic field with constant pulsing frequency on cardiovascular function of a small number of healthy subjects (five males age 30-65 years).
(2) to test responses to an extremely low frequency pulsed electromagnetic field pulsed at various frequencies in one subject exposed on 5 consecutive days, a different pulsing frequency each day.
In this study power spectral density is the investigative tool used. The power spectral density of the signal obtained from the RR intervals shows the contribution of rhythmic fluctuations that may affect the heart frequency. The autonomic nervous system controls the heart rate variability with sympathetic and parasympathetic afferents. This control can be detected in the lower frequency range, 0.04-0.15 Hz, for the sympathetic branch of autonomic nervous system and in the higher frequency band, 0.15-0.4 Hz, for the parasympathetic or vagal branch of the autonomic nervous system. Consequently, the lower frequency/higher frequency ratio is considered to mirror sympatho-vagal balance.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Modulation type:
pulsed
Exposure duration:
5 to 10 min off - 20 min on - 20 min off - 20 min on - 5 to 15 min off
|
|
|
Exposure 2:
50 Hz
Modulation type:
pulsed
Exposure duration:
exposure of one person to different extremly low frequency pulsed electromagnetic fields on 5 consecutive days
|
|
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | 5 to 10 min off - 20 min on - 20 min off - 20 min on - 5 to 15 min off |
| Modulation type | pulsed |
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 4.21 µT | - | measured | - | value at the heart of the test persons |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | exposure of one person to different extremly low frequency pulsed electromagnetic fields on 5 consecutive days |
| Modulation type | pulsed |
|---|
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 4.21 µT | - | measured | - | at the haert of the testperson |
The data revealed a heart rate variation in all the subjects when they are exposed to the same extremely low frequency pulsed electromagnetic field. This variation could be detected by observing the change in the sympatho-vagal equilibrium. Variation of the "lower frequency/higher frequency power spectral density" ratio mainly occured at transition times from exposure to non-exposure, or vice versa.
In the case of the same subject exposed to different pulse frequencies, the responses to the stimuli with a pulse frequency of 3 Hz and 4 Hz showed a noticeable variation in power spectral density ratio during the second period of exposure when compared to other pulsed electromagnetic fields.
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