[Biological action of electromagnetic fields of 4 MHz decametric waves].

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 4,
    "sar_wkg": null,
    "duration": "2 months; 16 hours/day"
  },
  "population": "Animals (non-linebred rats)",
  "sample_size": null,
  "outcomes": [
    "Adaptation potential of physiological systems",
    "Brain functional activity",
    "Cell-bound immunity",
    "Humoral immunity"
  ],
  "main_findings": "In non-linebred rats, exposure to an amplitude-modulated electromagnetic field at 4 MHz (field strengths 400, 200, and 100 V/m) for two months (16 hours/day) was reported to reduce the adaptation potential of several physiological systems. Reported changes included altered brain functional activity and changes in cell-bound and humoral immunity.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in abstract",
    "No control/comparator details provided in abstract",
    "Outcome measurement methods not described in abstract",
    "Animal study; generalizability to humans is limited"
  ],
  "evidence_strength": "low",
  "confidence": 0.72,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "4 MHz",
    "amplitude-modulated",
    "electromagnetic field",
    "V/m",
    "rats",
    "adaptation potential",
    "brain functional activity",
    "cell-bound immunity",
    "humoral immunity"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.78,
      "reason": "Study reports physiological and immune effects in rats after EMF exposure."
    }
  ]
}