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Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats

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Authors not listed · 2025

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5G millimeter waves trigger stress hormone changes in rats at exposure levels current safety guidelines consider harmless.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 28 GHz millimeter waves (5G frequencies) at power levels near current safety thresholds and measured stress hormone responses. They found that even single exposures altered stress hormones like corticosterone and noradrenaline for days afterward. This suggests 5G frequencies can trigger biological stress responses at levels currently considered safe.

Why This Matters

This study breaks important new ground by demonstrating that 5G millimeter waves trigger measurable stress responses in mammals at exposure levels that regulatory agencies consider safe. The researchers found altered stress hormones persisting for days after just 40 minutes of exposure to 28 GHz radiation at 3.7-7.2 W/kg. What makes this particularly concerning is that these power levels are at or near the 4 W/kg threshold that international guidelines use as their safety benchmark. The science demonstrates that biological effects are occurring right at the exposure levels regulators have deemed acceptable. This challenges the fundamental assumption that current 5G safety standards adequately protect public health. The reality is that your body's stress response system appears to recognize these millimeter waves as a threat, even when the exposure doesn't cause obvious heating effects.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 28 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 28 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2025). Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats.
Show BibTeX
@article{single_exposure_to_near_threshold_5g_millimeter_wave_modifies_restraint_stress_responses_in_rats_ce3375,
  author = {Unknown},
  title = {Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats},
  year = {2025},
  doi = {10.1265/ehpm.24-00321},
  
}
DOI: 10.1265/ehpm.24-00321PubMed: 40335291

Quick Questions About This Study

Yes, this study found that 40-minute exposures to 28 GHz millimeter waves altered stress hormones like corticosterone and noradrenaline in rats for up to 3 days after exposure, indicating biological stress responses.
The study found stress hormone changes at 3.7-7.2 W/kg whole-body exposure levels, which are at or near the 4 W/kg threshold that current international safety guidelines consider the limit for adverse effects.
Stress hormone changes persisted for 1-3 days after just a single 40-minute exposure to 28 GHz radiation, suggesting the biological impact extends well beyond the actual exposure period.
Yes, this research demonstrated that even a single 40-minute exposure to 28 GHz millimeter waves was sufficient to alter stress hormone levels for multiple days, indicating lasting physiological impacts.
This study suggests current limits may be inadequate, as stress hormone changes occurred at exposure levels near the 4 W/kg threshold that international guidelines use as their safety benchmark for preventing adverse effects.