Effects of pulse-modulated microwave radiation and conventional heating on sperm production.

Journal of applied physiology (Bethesda, Md. : 1985) · 1987 · Harm · Low evidence

← Research stream

HarmLow evidencePaper 6228

Study snapshot

PublicationJournal of applied physiology (Bethesda, Md. : 1985) · 1987

Study typeanimal

Reported directionHarm

Evidence ratingLow

Abstract

The effects on testicular function of pulse-modulated microwave radiation (PM MWR, 1.3 GHz) and of conventional heating were studied in the rat. Anesthetized adult males (Sprague-Dawley, 400-500 g) were treated then killed at specific intervals with respect to the 13-day cycle of the seminiferous epithelium. PM MWR at 7.7 mW/g (90 min) yielded a modest decline in daily sperm production (DSP) that derived primarily from effects on primary spermatocytes. PM MWR at 4.2 mW/g was ineffective. The mean intratesticular temperature during the former reached 40 degrees C and did not exceed 38 degrees C during the latter. MWR considerably in excess of 7.7 mW/g yielded decrements in virtually all germ cell types, with primary spermatocytes again being most markedly affected. Using conventional heating, intratesticular temperatures in excess of 39 degrees C for 60 min were required for significant decrements in DSP. Levels of circulating follicle-stimulating hormone and of leutinizing hormone were resistant to either treatment. We conclude that the damage threshold and the differential sensitivity of immature germ cells to PM MWR can be adequately explained by the consequent macroscopic heating.

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 directionharm

PopulationAnesthetized adult male Sprague-Dawley rats (400–500 g)

Sample sizeNot supplied

Exposuremicrowave · 1300 MHz · 7.7 W/kg · 90 min

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Pulse-modulated microwave radiation (1.3 GHz) at 7.7 mW/g for 90 min produced a modest decline in daily sperm production, primarily affecting primary spermatocytes; 4.2 mW/g was ineffective. Conventional heating required intratesticular temperatures >39°C for 60 min to significantly reduce DSP, and FSH/LH levels were resistant to either treatment; authors conclude effects are explained by macroscopic heating.

Outcomes measured

daily sperm production (DSP)
germ cell types (including primary spermatocytes)
intratesticular temperature
circulating follicle-stimulating hormone (FSH)
circulating luteinizing hormone (LH)

Limitations

Sample size not reported in abstract.
Details of exposure conditions beyond frequency, dose (mW/g), and duration are not provided in abstract.
Animal model; generalizability to humans not addressed in abstract.

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 1300,
    "sar_wkg": 7.7,
    "duration": "90 min"
  },
  "population": "Anesthetized adult male Sprague-Dawley rats (400–500 g)",
  "sample_size": null,
  "outcomes": [
    "daily sperm production (DSP)",
    "germ cell types (including primary spermatocytes)",
    "intratesticular temperature",
    "circulating follicle-stimulating hormone (FSH)",
    "circulating luteinizing hormone (LH)"
  ],
  "main_findings": "Pulse-modulated microwave radiation (1.3 GHz) at 7.7 mW/g for 90 min produced a modest decline in daily sperm production, primarily affecting primary spermatocytes; 4.2 mW/g was ineffective. Conventional heating required intratesticular temperatures >39°C for 60 min to significantly reduce DSP, and FSH/LH levels were resistant to either treatment; authors conclude effects are explained by macroscopic heating.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in abstract.",
    "Details of exposure conditions beyond frequency, dose (mW/g), and duration are not provided in abstract.",
    "Animal model; generalizability to humans not addressed in abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "pulse-modulated microwave radiation",
    "microwave",
    "1.3 GHz",
    "rat",
    "testicular function",
    "spermatogenesis",
    "daily sperm production",
    "primary spermatocytes",
    "intratesticular temperature",
    "heating",
    "FSH",
    "LH"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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.1987.62.1.245
PubMed: 3104288

Read the original paper →

Related papers

← Back to the Research Library