8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Reproductive Health

Thermal and metabolic responsiveness of Japanese quail embryos following periodic exposure to 2,450 MHz microwaves.

Bioeffects Seen

Spiers DE, Baummer SC · 1991

View Original Abstract
Share:

Microwave radiation accelerated quail embryo growth by up to 61% through heating effects, raising questions about wireless exposure during development.

Plain English Summary

Summary written for general audiences

Scientists exposed developing quail eggs to microwave radiation for 8 hours daily and found it accelerated embryo growth by 9-61% through heating effects. The faster development occurred without apparent abnormalities, demonstrating that microwave exposure can alter biological processes even when organisms seem normal.

Why This Matters

This study provides important insights into how microwave radiation affects developing organisms, using power densities (5-20 mW/cm²) that overlap with levels found near some wireless devices and cell towers. While the researchers framed their findings positively - noting no obvious abnormalities - the dramatic 61% increase in growth rate at higher exposures should give us pause. The reality is that accelerated development isn't necessarily healthy development, and this study only measured basic physiological markers, not subtle cellular or genetic changes that might emerge later. What this means for you is that developing organisms appear particularly sensitive to microwave radiation's heating effects, which has implications for pregnant women and children exposed to wireless devices.

Exposure Details

SAR
0.76 and 0.66 , 3.8 and 3.3 , 15.2 and 13.2 W/kg
Power Density
5 or 20 µW/m²
Source/Device
2,450 MHz
Exposure Duration
8 h/day

Exposure Context

This study used 5 or 20 µW/m² for radio frequency:

This study used 0.76 and 0.66 , 3.8 and 3.3 , 15.2 and 13.2 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 5 or 20 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Slight Concern rangeFCC limit is 2,000,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

Two studies were performed to determine if repeated exposure of the avian egg to microwaves can alter metabolism, temperature, and growth rate of embryos. Another aim was to supplement conventional heating with microwave heating and provide an optimal temperature for growth.

Japanese quail (Coturnix coturnix japonica) eggs were exposed from day 1 through 15 of incubation (8...

Repeated exposures to microwaves at 5 and 20 mW/cm2 at the same Ta (30 °C) increased wet-embryo mass...

Cite This Study
Spiers DE, Baummer SC (1991). Thermal and metabolic responsiveness of Japanese quail embryos following periodic exposure to 2,450 MHz microwaves. Bioelectromagnetics 12(4):225-239, 1991.
Show BibTeX
@article{de_1991_thermal_and_metabolic_responsiveness_1340,
  author = {Spiers DE and Baummer SC},
  title = {Thermal and metabolic responsiveness of Japanese quail embryos following periodic exposure to 2,450 MHz microwaves. },
  year = {1991},
  doi = {10.1002/bem.2250120404},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.2250120404},
}
DOI: 10.1002/bem.2250120404

Cited By (3 papers)

Quick Questions About This Study

Yes, microwave radiation can significantly alter embryo development. A 1991 study found that 2,450 MHz microwave exposure accelerated quail embryo growth by 9-61% through heating effects, demonstrating that microwave radiation directly impacts biological development processes even without causing apparent abnormalities.
This specific study found no birth defects from 2.4 GHz microwave exposure in quail embryos. While the radiation accelerated growth rates significantly, researchers found no reliable indication of abnormal physiological development when comparing exposed embryos to controls of similar mass.
Research shows microwave radiation can alter embryonic development processes. A study on quail embryos found that 2,450 MHz exposure increased growth rates by up to 61% through heating effects, indicating that microwave radiation does impact developing organisms during critical developmental periods.
Microwave exposure can dramatically accelerate growth rates through thermal effects. Research on developing quail embryos showed that 2,450 MHz radiation increased embryo mass by 9-61% compared to unexposed controls, demonstrating that microwave energy directly influences biological growth processes through heating mechanisms.
WiFi-frequency radiation (2.4 GHz) can alter normal developmental processes. A study found this frequency accelerated quail embryo growth by up to 61% through heating effects. While no abnormalities were observed, the research shows this radiation frequency impacts biological development during critical growth periods.