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Temperature and adrenocortical responses in rhesus monkeys exposed to microwaves.

Journal of applied physiology: respiratory, environmental and exercise physiology · 1982 · Mixed · Low evidence

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MixedLow evidencePaper 5967

Rhesus monkeys exposed to 1.29 GHz microwaves at incident power densities of 20, 28, and 38 mW/cm2 (SARs 2.1, 3.0, and 4.1 W/kg) showed average rectal temperature increases of 0.5, 0.7, and 1.7C, respectively. No changes in thyroxine (T4) or growth hormone (…

Study snapshot

PublicationJournal of applied physiology: respiratory, environmental and exercise physiology · 1982
Study typeanimal
Reported directionMixed
Evidence ratingLow

Abstract

To determine if the endocrine response to microwave exposure was similar in a primate to that reported for other animals, rectal temperature and plasma levels of cortisol, thyroxine (T4), and growth hormone (GH) were measured in rhesus monkeys exposed to 1.29 GHz microwave radiation. Exposures were carried out under far-field conditions with the monkey restrained in a chair. Incident power densities of 0, 20, 28, and 38 mW/cm2 were used, with corresponding specific absorption rates of 0, 2.1, 3.0, and 4.1 W/kg. Blood samples were taken hourly via an indwelling jugular venous catheter over a 24-h period before, during, and after an 8-h exposure. Rectal temperature increased an average of 0.5, 0.7, and 1.7 degrees C for the three intensities used. No changes in T1 or GH were observed. Cortisol levels were increased during exposure to 38 mW/cm2. It was concluded that the temperature and adrenocortical responses to microwave exposure of the rhesus monkey are similar to the corresponding responses of other animals.

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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
PopulationRhesus monkeys
Sample sizeNot supplied
Exposuremicrowave · 1290 MHz · 8-h exposure (with 24-h sampling before/during/after)
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Rhesus monkeys exposed to 1.29 GHz microwaves at incident power densities of 20, 28, and 38 mW/cm2 (SARs 2.1, 3.0, and 4.1 W/kg) showed average rectal temperature increases of 0.5, 0.7, and 1.7C, respectively. No changes in thyroxine (T4) or growth hormone (GH) were observed. Cortisol levels increased during exposure at 38 mW/cm2.

Outcomes measured

  • Rectal temperature
  • Plasma cortisol
  • Plasma thyroxine (T4)
  • Plasma growth hormone (GH)

Limitations

  • Sample size not reported in abstract
  • Exposure conditions included restraint in a chair, which could influence endocrine measures
  • Cortisol increase reported only at the highest exposure level; limited detail on statistical testing in abstract
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 1290,
    "sar_wkg": null,
    "duration": "8-h exposure (with 24-h sampling before/during/after)"
  },
  "population": "Rhesus monkeys",
  "sample_size": null,
  "outcomes": [
    "Rectal temperature",
    "Plasma cortisol",
    "Plasma thyroxine (T4)",
    "Plasma growth hormone (GH)"
  ],
  "main_findings": "Rhesus monkeys exposed to 1.29 GHz microwaves at incident power densities of 20, 28, and 38 mW/cm2 (SARs 2.1, 3.0, and 4.1 W/kg) showed average rectal temperature increases of 0.5, 0.7, and 1.7\u0000C, respectively. No changes in thyroxine (T4) or growth hormone (GH) were observed. Cortisol levels increased during exposure at 38 mW/cm2.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure conditions included restraint in a chair, which could influence endocrine measures",
    "Cortisol increase reported only at the highest exposure level; limited detail on statistical testing in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "rhesus monkey",
    "microwave radiation",
    "1.29 GHz",
    "rectal temperature",
    "cortisol",
    "thyroxine",
    "growth hormone",
    "SAR",
    "power density",
    "far-field exposure"
  ],
  "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: 10.1152/jappl.1982.53.6.1565
PubMed: 7153151

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