Polluted places or polluted minds? An experimental sham-exposure study on background psychological factors of symptom formation in 'Idiophatic Environmental Intolerance attributed to electromagnetic fields'.

International journal of hygiene and environmental health · 2010 · No effect · Moderate evidence

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No effectModerate evidencePaper 4374

Study snapshot

PublicationInternational journal of hygiene and environmental health · 2010

Study typeother

Reported directionNo effect

Evidence ratingModerate

Abstract

INTRODUCTION: 'Idiophatic Environmental Intolerance attributed to electromagnetic fields' (IEI-EMF) refers to the perception of subjective symptoms during or following EMF exposure. IEI-EMF has become disproved to be a mostly biologic entity by now, and evidences accumulate to support the role of nocebo effect in the phenomenon. The two aims of this study were to demonstrate the significant role of the nocebo effect in physical symptoms reported at 50Hz frequency of EMF exposure, as well as to explore some psychological factors which may predispose to IEI-EMF. METHODS: A total of 40 volunteer university students have completed a battery of psychological questionnaires (expectations; IEI-EMF; state anxiety - STAI-S; dispositional optimism - LOT-R; somatisation - PHQ-15; somatosensory amplification - SSAS) before, and checklists of physical symptoms during sham exposure to "weak" and "strong" EMFs, respectively. Participants were also asked about the extent to which they had perceived the presence of the presumed EMF. RESULTS: Participants with higher IEI-EMF scores expected and experienced more symptoms. Suggestion of stronger EMF exposure resulted in larger symptom scores and enhanced EMF-perception as compared to the presumed weaker exposure. Experienced symptom scores were predicted primarily by somatisation scores, whereas self-rating of IEI-EMF was predicted by somatosensory amplification scores. CONCLUSION: The results confirm that there is considerable nocebo effect in symptom reports related to 50Hz frequency EMFs. IEI-EMF seems to be formed through a vicious circle of psychosocial factors, such as enhanced perception of risk and expectations, self-monitoring, somatisation and somatosensory amplification, causalization and misattribution.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionno_effect

PopulationVolunteer university students

Sample size40

ExposureELF · 0.05 MHz

Evidence strengthModerateConfidence: 74% · Peer reviewed: yes

Main findings

In sham exposure conditions, participants with higher IEI-EMF scores expected and experienced more symptoms. Suggestion of a stronger EMF exposure produced higher symptom scores and greater perceived EMF presence than suggestion of a weaker exposure. Symptom scores were primarily predicted by somatisation, while IEI-EMF self-ratings were predicted by somatosensory amplification.

Outcomes measured

Physical symptom reports during sham exposure
Perceived presence of presumed EMF
Expectations
IEI-EMF self-rating/score
State anxiety (STAI-S)
Dispositional optimism (LOT-R)
Somatisation (PHQ-15)
Somatosensory amplification (SSAS)

Limitations

Sham exposure study (no actual EMF exposure described)
Small sample size (n=40)
Participants were volunteer university students (limited generalizability)
Exposure duration and objective exposure metrics not reported in abstract

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "ELF",
    "source": "sham exposure (suggested weak vs strong EMF)",
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Volunteer university students",
  "sample_size": 40,
  "outcomes": [
    "Physical symptom reports during sham exposure",
    "Perceived presence of presumed EMF",
    "Expectations",
    "IEI-EMF self-rating/score",
    "State anxiety (STAI-S)",
    "Dispositional optimism (LOT-R)",
    "Somatisation (PHQ-15)",
    "Somatosensory amplification (SSAS)"
  ],
  "main_findings": "In sham exposure conditions, participants with higher IEI-EMF scores expected and experienced more symptoms. Suggestion of a stronger EMF exposure produced higher symptom scores and greater perceived EMF presence than suggestion of a weaker exposure. Symptom scores were primarily predicted by somatisation, while IEI-EMF self-ratings were predicted by somatosensory amplification.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sham exposure study (no actual EMF exposure described)",
    "Small sample size (n=40)",
    "Participants were volunteer university students (limited generalizability)",
    "Exposure duration and objective exposure metrics not reported in abstract"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "IEI-EMF",
    "idiopathic environmental intolerance",
    "electromagnetic fields",
    "50 Hz",
    "ELF",
    "nocebo effect",
    "sham exposure",
    "symptom perception",
    "somatisation",
    "somatosensory amplification",
    "expectations"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Addresses IEI-EMF and nocebo-related symptom attribution, relevant to broader EMF health evidence discussions."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/j.ijheh.2010.05.001
PubMed: 20538519

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