The evaluation of biological efficiency of electromagnetic fields generated by implanted radiotelemetric transmitters used in space research on animals.

The Physiologist · 1992 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 5474

Study snapshot

PublicationThe Physiologist · 1992

Study typeanimal

Reported directionUnclear

Evidence ratingInsufficient

Abstract

The study was carried out in 50 male rats abdominally implanted with biotelemetric systems (BTS) or mock-up. The animals were provided with 12/12 light/dark schedule during 6-week experiment. The electromagnetic field (EMF) frequency was 455 kHz, magnetic induction near transducer was about 10(-2) mT. Circadian rhythm of the body temperature and locomotor activity was controlled in course of the experiment. The latter been finished, some tissues and the blood of the animals have been sampled to test corticosterone, testosterone, T3, T4 level in serum with radioimmunoassay and membrane permeability for Ca2+, Na+, K(+)-ATPase activity and charge changes in liver microsomes was detected. The probable ways of the EMF influence on whole body are discussed.

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 typeanimal

Effect directionunclear

Population50 male rats

Sample size50

Exposure0.455 MHz · 6-week experiment

Evidence strengthInsufficientConfidence: 62% · Peer reviewed: yes

Main findings

Outcomes measured

Circadian rhythm of body temperature
Locomotor activity
Serum corticosterone
Serum testosterone
Serum T3
Serum T4
Membrane permeability for Ca2+
Na+, K(+)-ATPase activity
Charge changes in liver microsomes

Limitations

No results are reported in the abstract (direction/magnitude of effects not stated).
Exposure metrics are limited to frequency and magnetic induction near the transducer; other dosimetry (e.g., SAR) not provided in the abstract.

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": "implanted radiotelemetric transmitters (biotelemetric systems)",
    "frequency_mhz": 0.455,
    "sar_wkg": null,
    "duration": "6-week experiment"
  },
  "population": "50 male rats",
  "sample_size": 50,
  "outcomes": [
    "Circadian rhythm of body temperature",
    "Locomotor activity",
    "Serum corticosterone",
    "Serum testosterone",
    "Serum T3",
    "Serum T4",
    "Membrane permeability for Ca2+",
    "Na+, K(+)-ATPase activity",
    "Charge changes in liver microsomes"
  ],
  "main_findings": null,
  "effect_direction": "unclear",
  "limitations": [
    "No results are reported in the abstract (direction/magnitude of effects not stated).",
    "Exposure metrics are limited to frequency and magnetic induction near the transducer; other dosimetry (e.g., SAR) not provided in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.62,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "rats",
    "implanted transmitter",
    "biotelemetry",
    "radiotelemetric",
    "455 kHz",
    "magnetic induction",
    "circadian rhythm",
    "body temperature",
    "locomotor activity",
    "corticosterone",
    "testosterone",
    "thyroid hormones",
    "T3",
    "T4",
    "membrane permeability",
    "Na,K-ATPase",
    "liver microsomes"
  ],
  "suggested_hubs": []
}

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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: Not supplied
PubMed: 1589524

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