Effects of electromagnetic fields and gender on neurotransmitters and amino acids in rats.

Physiology & behavior · 1995 · Mixed · Low evidence

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MixedLow evidencePaper 5438

Study snapshot

PublicationPhysiology & behavior · 1995

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

Epidemiological studies have linked electromagnetic field (EMF) exposure to certain forms of cancer, however only limited laboratory evidence supports a connection between EMF and biological effects. In the present study we exposed male and female rats to low level, 1000 milli-Gauss (mGs), direct current EMF generated with Helmholtz coils for 1 mo or 4 mo. The effects of these EMF exposures on regional brain neurotransmitter metabolism and circulating amino acid concentrations were determined. After 1 mo of EMF exposure the concentration of serotonin was elevated in the hypothalamus of male rats. Levels of the dopamine metabolite, 3-methoxytyramine, were increased in the corpus striatum of male and female rats that were exposed to EMF for 1 mo. Hypothalamic concentration of norepinephrine was elevated in both groups of male rats, as compared to respective female groups, but was not affected by EMF. Similarly, levels of tyrosine were increased in hypothalamus, corpus striatum and nucleus accumbens of male rats, but were not affected by EMF exposure. Following 4 mo of EMF exposure, no significant effect of EMF was observed. Significant sex differences in plasma amino acid concentrations were observed in both studies, with female rats exhibiting decreases in a majority of the amino acids measured. These results are suggestive that short-term exposure may cause small alterations in neurotransmitter metabolism and in circulating amino acids, which dissipate when exposure duration is increased.

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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 directionmixed

PopulationMale and female rats

Sample sizeNot supplied

Exposure1 month or 4 months

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Rats were exposed to low-level (1000 milli-Gauss) direct current EMF for 1 or 4 months. After 1 month, serotonin was elevated in the hypothalamus of male rats and the dopamine metabolite 3-methoxytyramine was increased in the corpus striatum of both sexes; after 4 months, no significant EMF effects were observed. Sex differences were observed for several measures (e.g., plasma amino acids), and some neurotransmitter/amino-acid differences were reported as not affected by EMF.

Outcomes measured

Regional brain neurotransmitter concentrations/metabolism (e.g., serotonin, norepinephrine, 3-methoxytyramine)
Circulating/plasma amino acid concentrations
Sex differences in neurotransmitters and amino acids

Limitations

Sample size not reported in the provided abstract
Animal study; generalizability to humans is uncertain
Exposure described as direct current EMF at 1000 mG; other exposure characteristics (e.g., waveform details) not provided in the abstract
Several outcomes show sex differences independent of EMF, complicating interpretation

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": "Helmholtz coils (direct current EMF)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "1 month or 4 months"
  },
  "population": "Male and female rats",
  "sample_size": null,
  "outcomes": [
    "Regional brain neurotransmitter concentrations/metabolism (e.g., serotonin, norepinephrine, 3-methoxytyramine)",
    "Circulating/plasma amino acid concentrations",
    "Sex differences in neurotransmitters and amino acids"
  ],
  "main_findings": "Rats were exposed to low-level (1000 milli-Gauss) direct current EMF for 1 or 4 months. After 1 month, serotonin was elevated in the hypothalamus of male rats and the dopamine metabolite 3-methoxytyramine was increased in the corpus striatum of both sexes; after 4 months, no significant EMF effects were observed. Sex differences were observed for several measures (e.g., plasma amino acids), and some neurotransmitter/amino-acid differences were reported as not affected by EMF.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in the provided abstract",
    "Animal study; generalizability to humans is uncertain",
    "Exposure described as direct current EMF at 1000 mG; other exposure characteristics (e.g., waveform details) not provided in the abstract",
    "Several outcomes show sex differences independent of EMF, complicating interpretation"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic field",
    "direct current",
    "1000 milli-Gauss",
    "Helmholtz coils",
    "rats",
    "sex differences",
    "serotonin",
    "norepinephrine",
    "dopamine metabolite",
    "3-methoxytyramine",
    "amino acids",
    "hypothalamus",
    "corpus striatum",
    "nucleus accumbens"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental EMF exposure study in male and female rats assessing neurochemical outcomes."
    }
  ]
}

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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: 10.1016/0031-9384(95)00090-6
PubMed: 8559785

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