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Huss A et al, (February 2018) Occupational exposure to extremely low-frequency magnetic fields and the risk of ALS: A systematic review and meta-analysis., Bioelectromagnetics. 2018 Feb;39(2):156-163. doi: 10.1002/bem.22104

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Authors not listed · 2018

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Meta-analysis of 20 studies finds electrical workers face 41% higher ALS risk from occupational EMF exposure.

Plain English Summary

Summary written for general audiences

Researchers analyzed 20 studies examining whether workers exposed to extremely low-frequency magnetic fields (like those from power lines and electrical equipment) have higher rates of ALS, a fatal neurodegenerative disease. They found a 14% increased risk overall and 41% higher risk for electrical workers, with the strongest associations in studies that tracked workers' complete job histories rather than just snapshot assessments.

Why This Matters

This meta-analysis adds significant weight to concerns about occupational EMF exposure and neurological disease. The 41% increased ALS risk for electrical workers is particularly striking because these are the people with the highest chronic exposures to the same 50-60 Hz frequencies that power our electrical grid. What makes this study especially credible is how the researchers found that better exposure assessment methods yielded stronger associations. When studies tracked workers' entire careers rather than just a few time points, the risk nearly doubled to 89%. This suggests the real risks may be higher than even these concerning numbers indicate. While your home exposure to power line frequencies is typically much lower than occupational levels, this research underscores why minimizing unnecessary EMF exposure makes biological sense. The electrical grid that powers our modern world may carry hidden costs for those who work most closely with it.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2018). Huss A et al, (February 2018) Occupational exposure to extremely low-frequency magnetic fields and the risk of ALS: A systematic review and meta-analysis., Bioelectromagnetics. 2018 Feb;39(2):156-163. doi: 10.1002/bem.22104.
Show BibTeX
@article{huss_a_et_al_february_2018_occupational_exposure_to_extremely_low_frequency_magnetic_fields_and_the_risk_of_als_a_systematic_review_and_meta_analysis_bioelectromagnetics_2018_feb392156_163_doi_101002b_ce1299,
  author = {Unknown},
  title = {Huss A et al, (February 2018) Occupational exposure to extremely low-frequency magnetic fields and the risk of ALS: A systematic review and meta-analysis., Bioelectromagnetics. 2018 Feb;39(2):156-163. doi: 10.1002/bem.22104},
  year = {2018},
  doi = {10.1002/bem.22104},
  
}
DOI: 10.1002/bem.22104PubMed: 29350413

Quick Questions About This Study

Yes, this meta-analysis found electrical workers have a 41% higher risk of developing ALS compared to workers in non-electrical occupations. The increased risk was most pronounced in studies that evaluated workers' complete career histories rather than just snapshots.
This analysis of 20 studies found a 14% overall increased ALS risk with occupational extremely low-frequency magnetic field exposure. The association was stronger (89% increased risk) in studies with the most comprehensive exposure assessments covering entire work careers.
Studies using weaker exposure assessment methods (self-reported exposure or job titles from death certificates) showed no increased ALS risk. However, studies with better exposure tracking found significant associations, suggesting measurement quality affects results.
Researchers included 20 epidemiological studies in their meta-analysis examining occupational extremely low-frequency magnetic field exposure and ALS risk. They found studies from medical databases, reference lists, and specialist databases to ensure comprehensive coverage.
Yes, dramatically. Studies evaluating workers' complete occupational histories found an 89% increased ALS risk, while studies examining only limited time periods showed just 6% increased risk. Comprehensive exposure assessment revealed much stronger associations.