To compare heart rate signals recorded during 50 Hz magnetic field with heart rate signals acquired under environmental conditions. The exposure system was a commercial device for magnetotherapy.
Exposure | Parameters |
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Exposure 1:
50 Hz
Exposure duration:
continuous for 1 h
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Exposure 2:
50 Hz
Exposure duration:
intermittent, 30 min off (sham exposure) followed by 30 min magnetic field exposure
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|
Frequency | 50 Hz |
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Type | |
Waveform | |
Exposure duration | continuous for 1 h |
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
magnetic flux density | 500 µT | unspecified | measured | - | in the center of the coil |
magnetic flux density | 20 µT | minimum | measured | - | at the head position |
magnetic flux density | 30 µT | maximum | measured | - | at the head position |
magnetic flux density | 150 µT | minimum | measured | - | at the heart position |
magnetic flux density | 200 µT | maximum | measured | - | at the heart position |
Frequency | 50 Hz |
---|---|
Type | |
Waveform | |
Exposure duration | intermittent, 30 min off (sham exposure) followed by 30 min magnetic field exposure |
Exposure source |
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Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
magnetic flux density | 500 µT | unspecified | measured | - | in the center of the coil |
magnetic flux density | 20 µT | minimum | measured | - | at the head position |
magnetic flux density | 30 µT | maximum | measured | - | at the head position |
magnetic flux density | 150 µT | minimum | measured | - | at the heart position |
magnetic flux density | 200 µT | maximum | measured | - | at the heart position |
Statistical analysis (repeated measures ANOVA) performed for sham exposure (magnetic field-off/magnetic field-off protocol) indicated no statistical difference of heart rate variability data. Repeated measures ANOVA followed by another statistical test (post hoc Tukey test) performed for exposure (magnetic field-off/magnetic field-on protocol) indicated a statistically significant difference during magnetic field on for mean time between heart beats (8% increase), standard deviation between heart beats (40% increase), and pNN50 (110% increase).
The data of the analysis indicate that the changes of these parameters could be associated with the influence of magnetic field.
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