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Sleep & Circadian Rhythm

EFFECTS OF 60 Hz ENVIRONMENTAL ELECTRIC FIELDS ON THE CENTRAL NERVOUS SYSTEM OF LABORATORY RATS

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S.M. Bawin, I. Sabbot, B. Bystrom, P.M. Sagan, W.R. Adey · 1979

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Power line frequency electric fields at transmission line levels consistently disrupted rat sleep patterns without affecting other measured health parameters.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 60 Hz electric fields at household power line frequencies for 30 days, testing field strengths from 50 to 1000 V/m. While most health measures showed no changes, rats exposed to the highest field strength (1000 V/m) showed altered sleep patterns and increased daytime activity. This suggests that power frequency fields at levels found near transmission lines may subtly affect circadian rhythms.

Why This Matters

This 1979 study provides early evidence that power frequency electric fields can disrupt biological rhythms, even when most other health measures appear normal. The field strengths tested here are particularly relevant because 1000 V/m represents what you might encounter directly under high-voltage transmission lines, while 50-500 V/m occurs near household wiring and appliances. What makes this research significant is that it detected subtle but consistent changes in activity patterns that could easily be missed in shorter studies. The fact that these effects appeared specifically during nighttime hours suggests the fields may interfere with natural circadian processes. While the researchers found no changes in organ weights or blood chemistry, the consistent disruption of sleep-wake cycles raises questions about longer-term health implications. The science demonstrates that our bodies can detect and respond to power frequency fields at levels we encounter daily, even when gross physiological measures appear unchanged.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
S.M. Bawin, I. Sabbot, B. Bystrom, P.M. Sagan, W.R. Adey (1979). EFFECTS OF 60 Hz ENVIRONMENTAL ELECTRIC FIELDS ON THE CENTRAL NERVOUS SYSTEM OF LABORATORY RATS.
Show BibTeX
@article{effects_of_60_hz_environmental_electric_fields_on_the_central_nervous_system_of__g4062,
  author = {S.M. Bawin and I. Sabbot and B. Bystrom and P.M. Sagan and W.R. Adey},
  title = {EFFECTS OF 60 Hz ENVIRONMENTAL ELECTRIC FIELDS ON THE CENTRAL NERVOUS SYSTEM OF LABORATORY RATS},
  year = {1979},
  
  
}

Quick Questions About This Study

Yes, this study found that rats exposed to 1000 V/m 60 Hz electric fields showed consistently reduced late-night activity and increased morning activity, suggesting disrupted circadian rhythms even when other health measures appeared normal.
The study found behavioral effects at 1000 V/m but not at 50 or 500 V/m. This highest level represents fields found directly under high-voltage transmission lines, while lower levels had no detectable impact on activity patterns.
Sleep pattern disruptions appeared during the first days of 30-day exposure to 1000 V/m fields. The effects were consistent throughout the exposure period, suggesting the behavioral changes occurred relatively quickly after field exposure began.
No, this study found no statistically significant differences in thyroid weight, adrenal weight, blood analysis, or urine electrolyte levels between rats exposed to 60 Hz electric fields and control animals, despite the behavioral changes observed.
The late-night activity reduction was statistically significant and consistent, while the increased morning activity showed a clear pattern but fell short of statistical significance (p = .188), though it occurred in all five test sessions.