Impact of electromagnetic fields on circadian rhythms: molecular and physiological insights

Abstract

Purpose: Electromagnetic fields (EMFs) are ubiquitous in modern environments, raising concerns about their potential influence on circadian rhythms and human health. This systematic review examines the biological mechanisms underlying EMF-circadian interactions to inform evidence-based public health policies. Methods: Following PRISMA 2020 guidelines, we systematically searched PubMed/MEDLINE, Web of Science, Scopus, and EMBASE for peer-reviewed studies published between 2010 and 2024. From 892 initial records, 55 studies met inclusion criteria after rigorous screening, comprising 22 in vitro studies, 21 animal studies, and 12 human studies. Results: EMF exposure can affect circadian regulation through multiple pathways including clock gene expression alterations, melatonin disruption, and cellular signaling modulation. The most robust evidence involves melatonin suppression (88% of high-quality animal studies) and sleep architecture changes. However, evidence quality varied considerably, with only 27% of studies meeting high methodological standards. Critical limitations include inadequate sham controls in 48% of animal studies, incomplete EMF exposure characterization in 33% of investigations, and minimal high-quality human research. The magnitude of melatonin suppression (20-50%) is substantially lower than light-induced effects (> 90%), raising questions about clinical significance. Translation from cellular effects to systemic circadian disruption remains incompletely established. Conclusion: While EMFs can influence molecular and cellular circadian components, whether typical environmental exposures produce clinically meaningful circadian disruption in humans remains uncertain. The findings highlight critical evidence gaps and underscore the need for well-controlled studies with standardized protocols, rigorous designs, and comprehensive circadian assessment to clarify public health implications of chronic EMF exposure.

AI evidence extraction

Main findings

This systematic review of 55 studies reported that EMF exposure can affect circadian-related molecular and physiological pathways, including clock gene expression, melatonin, cellular signaling, and sleep architecture. The strongest evidence was for melatonin suppression in animal studies, but overall study quality was variable and high-quality human evidence was limited. The review concluded that clinically meaningful circadian disruption in humans from typical environmental exposures remains uncertain.

Outcomes measured

• circadian rhythms
• clock gene expression
• melatonin
• cellular signaling
• sleep architecture

Limitations

• Only 27% of included studies met high methodological standards
• Inadequate sham controls in 48% of animal studies
• Incomplete EMF exposure characterization in 33% of investigations
• Minimal high-quality human research
• Translation from cellular effects to systemic circadian disruption remains incompletely established

{
    "study_type": "systematic_review",
    "exposure": {
        "band": "unknown",
        "source": "other",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "chronic EMF exposure"
    },
    "population": "22 in vitro studies, 21 animal studies, and 12 human studies included in the review",
    "sample_size": 55,
    "outcomes": [
        "circadian rhythms",
        "clock gene expression",
        "melatonin",
        "cellular signaling",
        "sleep architecture"
    ],
    "main_findings": "This systematic review of 55 studies reported that EMF exposure can affect circadian-related molecular and physiological pathways, including clock gene expression, melatonin, cellular signaling, and sleep architecture. The strongest evidence was for melatonin suppression in animal studies, but overall study quality was variable and high-quality human evidence was limited. The review concluded that clinically meaningful circadian disruption in humans from typical environmental exposures remains uncertain.",
    "effect_direction": "mixed",
    "limitations": [
        "Only 27% of included studies met high methodological standards",
        "Inadequate sham controls in 48% of animal studies",
        "Incomplete EMF exposure characterization in 33% of investigations",
        "Minimal high-quality human research",
        "Translation from cellular effects to systemic circadian disruption remains incompletely established"
    ],
    "evidence_strength": "low",
    "confidence": 0.91000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "EMF",
        "electromagnetic fields",
        "circadian rhythms",
        "melatonin",
        "clock genes",
        "sleep architecture",
        "systematic review",
        "animal studies",
        "human studies",
        "in vitro"
    ],
    "suggested_hubs": []
}

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