Sperm count and sperm abnormality in male mice after exposure to 2.45 GHz microwave radiation

Abstract

Adult male mice had the posterior halves of their bodies exposed at 44 W/kg in a waveguide system to 2.45 GHz microwave radiation for 30 min. They were killed sequentially over 10 weeks and assessed for decreased sperm count and abnormal sperm morphology. The response in each assay was maximal 2-4 weeks after the exposure. This corresponds to microwaves having their greatest effect on spermatids and spermatocytes. Male fertility, assessed as the proportion of normal sperm per epididymis, was compared with results of an earlier study on dominant lethality. It is concluded that reduced male fertility correlates well with reduced pregnancy rate but less well with pre-implantation survival. Whilst microwaves clearly induced abnormally shaped sperm, those which achieved fertilization cannot have possessed a dominant mutation which would result in the post-implantation death of the embryo.

AI evidence extraction

Main findings

Adult male mice exposed (posterior half-body) to 2.45 GHz microwaves at 44 W/kg for 30 min showed decreased sperm count and increased abnormal sperm morphology, with maximal responses 2–4 weeks post-exposure. The authors conclude reduced male fertility correlated well with reduced pregnancy rate but less well with pre-implantation survival, and state that sperm achieving fertilization could not have carried a dominant mutation causing post-implantation embryo death.

Outcomes measured

• sperm count
• abnormal sperm morphology
• male fertility (proportion of normal sperm per epididymis)
• pregnancy rate (comparison to earlier dominant lethality study)
• pre-implantation survival (comparison to earlier dominant lethality study)
• post-implantation death of embryo (inference via dominant mutation discussion)

Limitations

• Sample size not reported in the abstract.
• Single exposure condition reported (2.45 GHz, 44 W/kg, 30 min) with no other doses described in the abstract.
• Exposure was limited to the posterior half of the body, which may limit generalizability to whole-body exposures.
• Some reproductive outcomes are discussed via comparison to an earlier study rather than reported directly here.

Suggested hubs

• rf-fertility (0.9)
  Assesses sperm count, sperm morphology, and male fertility after 2.45 GHz exposure in mice.

{
    "study_type": "animal",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 2450,
        "sar_wkg": 44,
        "duration": "30 min"
    },
    "population": "Adult male mice",
    "sample_size": null,
    "outcomes": [
        "sperm count",
        "abnormal sperm morphology",
        "male fertility (proportion of normal sperm per epididymis)",
        "pregnancy rate (comparison to earlier dominant lethality study)",
        "pre-implantation survival (comparison to earlier dominant lethality study)",
        "post-implantation death of embryo (inference via dominant mutation discussion)"
    ],
    "main_findings": "Adult male mice exposed (posterior half-body) to 2.45 GHz microwaves at 44 W/kg for 30 min showed decreased sperm count and increased abnormal sperm morphology, with maximal responses 2–4 weeks post-exposure. The authors conclude reduced male fertility correlated well with reduced pregnancy rate but less well with pre-implantation survival, and state that sperm achieving fertilization could not have carried a dominant mutation causing post-implantation embryo death.",
    "effect_direction": "harm",
    "limitations": [
        "Sample size not reported in the abstract.",
        "Single exposure condition reported (2.45 GHz, 44 W/kg, 30 min) with no other doses described in the abstract.",
        "Exposure was limited to the posterior half of the body, which may limit generalizability to whole-body exposures.",
        "Some reproductive outcomes are discussed via comparison to an earlier study rather than reported directly here."
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "mouse",
        "microwave radiation",
        "2.45 GHz",
        "SAR 44 W/kg",
        "sperm count",
        "sperm morphology",
        "male fertility",
        "epididymis",
        "spermatids",
        "spermatocytes",
        "dominant lethality"
    ],
    "suggested_hubs": [
        {
            "slug": "rf-fertility",
            "weight": 0.90000000000000002220446049250313080847263336181640625,
            "reason": "Assesses sperm count, sperm morphology, and male fertility after 2.45 GHz exposure in mice."
        }
    ]
}

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