Sinusoidal electromagnetic field of 50 hz helps in retaining calcium in tibias of aged rats.

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": "4 weeks"
  },
  "population": "Young and old female and male Wistar rats",
  "sample_size": null,
  "outcomes": [
    "45Ca retention in tibias",
    "Serum calcium levels",
    "Inorganic phosphate levels",
    "Tartrate resistant acid phosphatase levels",
    "Alkaline phosphatase levels"
  ],
  "main_findings": "Exposure to 50 Hz sinusoidal electromagnetic field increased 45Ca retention in tibias in aged rats only. In young rats, serum calcium levels decreased after 4 weeks of exposure, while serum calcium in aged rats and inorganic phosphates in both age groups were unchanged. Tartrate resistant acid and alkaline phosphatase levels decreased in young rats but remained unchanged in aged rats.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure regimen details beyond duration (e.g., daily exposure time) not reported",
    "Animal study; generalizability to humans is uncertain"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "50 Hz",
    "sinusoidal electromagnetic field",
    "SEMF",
    "ELF-EMF",
    "1 mT",
    "Wistar rats",
    "bone physiology",
    "tibia",
    "calcium retention",
    "aging",
    "serum calcium",
    "alkaline phosphatase",
    "tartrate resistant acid phosphatase"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental exposure study in rats assessing bone/calcium outcomes."
    }
  ]
}