Exposure of Man to Magnetic Fields Alternating at Extremely Low Frequency

Abstract

Ten subjects were confined for periods up to 7 days and during this time were exposed to a low-intensity magnetic field (10^-4 Wb/m^2 at 45 Hz) for periods up to 24 hours. Five subjects were confined but were not exposed. A large battery of physiological and psychophysiological tests were given throughout the confinement period. No effects were seen that could be definitely linked with the magnetic field. The only changes that could be correlated with the time course of exposure to the ELF magnetic field were in serum triglycerides of blood samples drawn 14 hours after the evening meal. In 9 of the 10 exposed subjects, serum triglycerides reached a maximum value 24 to 40 hours after the ELF field exposure. Similar trends were not seen in any of the 5 control subjects. For the corresponding period chylomicrons were negligible for all subjects while cholesterol levels were stable and within the normal range; therefore, the serum triglycerides were in the form of very low density lipoproteins. The number of subjects is too small, however, to exclude statistically other factors such as psychophysiological reactions to forced changes in personal living habits, modified activity, restricted diet, and confinement. A final conclusion must await further experiments and the establishment of a relationship between field strength and physiological effects, as well as establishment of a threshold for the effects. See Video rfsafe.org

AI evidence extraction

Main findings

No definite effects were linked to ELF magnetic field exposure except an increase in serum triglycerides 24 to 40 hours after exposure in 9 of 10 exposed subjects, not seen in controls. Cholesterol and chylomicrons remained stable. Small sample size and confounding factors limit conclusions.

Outcomes measured

• physiological tests
• psychophysiological tests
• serum triglycerides levels
• cholesterol levels
• chylomicrons

Limitations

• small sample size
• possible confounding from confinement and lifestyle changes
• lack of established dose-response relationship
• no threshold established

{
    "study_type": "randomized_trial",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": 0.04499999999999999833466546306226518936455249786376953125,
        "sar_wkg": null,
        "duration": "up to 24 hours"
    },
    "population": "10 exposed human subjects and 5 control subjects confined up to 7 days",
    "sample_size": 15,
    "outcomes": [
        "physiological tests",
        "psychophysiological tests",
        "serum triglycerides levels",
        "cholesterol levels",
        "chylomicrons"
    ],
    "main_findings": "No definite effects were linked to ELF magnetic field exposure except an increase in serum triglycerides 24 to 40 hours after exposure in 9 of 10 exposed subjects, not seen in controls. Cholesterol and chylomicrons remained stable. Small sample size and confounding factors limit conclusions.",
    "effect_direction": "unclear",
    "limitations": [
        "small sample size",
        "possible confounding from confinement and lifestyle changes",
        "lack of established dose-response relationship",
        "no threshold established"
    ],
    "evidence_strength": "low",
    "confidence": 0.299999999999999988897769753748434595763683319091796875,
    "peer_reviewed_likely": "unknown",
    "keywords": [
        "ELF magnetic fields",
        "serum triglycerides",
        "human exposure",
        "physiological effects",
        "psychophysiological tests"
    ],
    "suggested_hubs": []
}

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