To study the potential impact of radiofrequency electromagnetic fields of transmitters on the sleep quality of nearby residents, a new study design is presented: In a cross-over study the effect of on-site shielding rather than of additional exposure, was examined.
The study was performed in the homes of volunteers under real environmental field conditions (i.e. in the bedrooms of the subjects). Data of 43 subjects (26 women, 17 men) were analysed. The subjects suffered from permanent and severe sleep disturbances and were deeply convinced that environmental radiofrequency electromagnetic fields caused their problems.
Sham-shielding was performed by using a sham shield.
volunteers were divided into three groups: i) true shield ii) sham shield iii) control
|Frequency||80 MHz–2.5 GHz|
|Exposure duration||nine consecutive nights under different shielding conditions|
|Setup||Mobile Faraday cage mounted around all sides of the volunteer's bed, including the bottom. After an adaptation night, polysomnographic measurements were recorded from each volunteer during nine nights under one of the following conditions in random order: real shield, sham shield, and unshielded control.|
|Additional info||Radiofrequency electromagnetic fields were recorded frequency-selectively by a broadband spectral analyser.|
Pooled data analysis did not exhibit statistically significant electromagnetic field-dependent sleep parameters, neither on total radiofrequency electromagnetic field immissions nor on base station signals. Volunteer-specific analysis mostly did not show any significant effect on sleep parameters.