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Local exposure of the rat cortex to radiofrequency electromagnetic fields increases local cerebral blood flow along with temperature

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Masuda H, Hirata A, Kawai H, Wake K, Watanabe S, Arima T, Poulletier de Gannes F, Lagroye I, Veyret B. · 2011

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Local radiofrequency exposure of the rat cortex increased cerebral blood flow along with a rise in local temperature.

Plain English Summary

Summary written for general audiences

The study aimed to detect reproducible responses to local radiofrequency exposure in the parietal cortex of anesthetized rats and to determine their dependence on exposure intensity. The target cortex tissue was locally exposed to 2-GHz RF using a figure-eight loop antenna at averaged specific absorption rates of 10.5, 40.3, 130, and 263 W/kg. All measured parameters except calf hypodermis temperature increased significantly in exposed animals compared with sham-exposed ones during 18-min exposures. The local cerebral blood flow elevation seemed to be driven by the rise in target temperature, but not by rectal temperature, in the early part of RF exposure or at low-intensity RF exposure.

Why This Matters

Local cerebral blood flow and temperatures in three regions, the target area, rectum, and calf hypodermis, were measured using optical fiber blood flow meters and thermometers during RF exposure. The dependence of parameter values on exposure intensity was analyzed using linear regression models. The elevation of local cerebral blood flow was correlated with temperature rise in both the target area and rectum at the end of RF exposure. The researchers suggested their findings may be helpful for discussing physiological changes in the local cortex region that is locally exposed to RF.

Exposure Details

SAR
10.5, 40.3, 130, and 263 W/kg
Source/Device
1,950 MHz
Exposure Duration
continuous for 18 min

Exposure Context

This study used 10.5, 40.3, 130, and 263 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: 10.5, 40.3, 130, and 263 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 7 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.95 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.95 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of the present study was to detect reproducible responses to local RF exposure in the parietal cortex of anesthetized rats and to determine their dependence on RF intensity.

The target cortex tissue was locally exposed to 2-GHz RF using a figure-eight loop antenna within a ...

All parameters except for the calf hypodermis temperature increased significantly in exposed animals...

These findings suggest that local RF exposure of the rat cortex drives a regulation of CBF accompanied by a local temperature rise, and our findings may be helpful for discussing physiological changes in the local cortex region, which is locally exposed to RF.

Cite This Study
Masuda H, Hirata A, Kawai H, Wake K, Watanabe S, Arima T, Poulletier de Gannes F, Lagroye I, Veyret B. (2011). Local exposure of the rat cortex to radiofrequency electromagnetic fields increases local cerebral blood flow along with temperature J Appl Physiol. 110(1):142-148, 2011.
Show BibTeX
@article{h_2011_local_exposure_of_the_141,
  author = {Masuda H and Hirata A and Kawai H and Wake K and Watanabe S and Arima T and Poulletier de Gannes F and Lagroye I and Veyret B.},
  title = {Local exposure of the rat cortex to radiofrequency electromagnetic fields increases local cerebral blood flow along with temperature},
  year = {2011},
  doi = {10.1152/japplphysiol.01035.2010},
  url = {https://journals.physiology.org/doi/full/10.1152/japplphysiol.01035.2010},
}
DOI: 10.1152/japplphysiol.01035.2010

Cited By (31 papers)

View all 31 citing papers on Semantic Scholar

Quick Questions About This Study

The target cortex tissue was locally exposed to 2-GHz RF at averaged specific absorption rates of 10.5, 40.3, 130, and 263 W/kg.
Local cerebral blood flow increased significantly in exposed animals compared with sham-exposed ones during 18-min exposures.
The local cerebral blood flow elevation seemed to be elevated by the rise in target temperature, but not by rectal temperature, in the early part of RF exposure or at low-intensity RF exposure.
The calf hypodermis temperature did not increase significantly in exposed animals compared with sham-exposed ones.
The researchers suggested their findings may be helpful for discussing physiological changes in the local cortex region that is locally exposed to RF.