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Medical/biological Study (experimental study)

Effects of pulsed high-frequency electromagnetic fields on the neuroendocrine system. med./biol.

By: Mann K, Wagner P, Brunn G, Hassan F, Hiemke C, Roeschke J
Published in: Neuroendocrinology 1998; 67 (2): 139 - 144 ( open external web page PubMed Entry , open external web page Journal web site )

Aim of study (according to author)
To investigate the influence of pulsed high-frequency electromagnetic fields in the lower microwave frequency range generated by a digital mobile telephone on the neuroendocrine system (hormone secretion) in healthy humans.

Endpoint

Exposure
General category: digital mobile phone, GSM

Field characteristicsParameters
900 MHz
pulsed (PW)
exposure duration: continuous for 8 h		power flux density: 0.02 mW/cm² mean value (at 40 cm)

FIELD View further expo parameters

Exposed system:
human
partial body exposure: head

Methods
Endpoint/Measurement parameters/Methodology

investigated material: isolated bio./chem. substance (in vitro)
investigation on living organism
investigated organ systems: sense organs, muscular/skeletal system, cardiovascular system, neuroendocrine system

time of investigation: during exposure

Main outcome of study (according to author)
The only significant effect found was an interaction between field exposure and time for cortisol concentration. This indicates an alterated temporal secretion pattern of cortisol under exposure. A transient elevation in the cortisol serum level immediately after onset of field exposure was found which persisted for 1h. For growth hormone, luteinizing hormone, and melatonin, no significant effects were found under radiation compared to the placebo condition, regarding both total hormone production during the night and dynamic characteristics of the secretion pattern. The evaluation of the sleep EEG data revealed no significant effects under radiation compared to the placebo condition. However, an indication of an REM sleep suppressive effect could be found. The data indicate that weak high-frequency electromagnetic fields have no effects on nocturnal hormone secretion except for a slight elevation in cortisol production which is transient (pointing to an adaption of the organism to the stimulus).

(Study character: medical/biological study, experimental study, pilot/exploratory/preliminary study)

Study funded by

  • Deutsche Telekom/T-Systems, Germany

Related articles i
Glossary: adaption, assay, biological, cardiovascular system, cortisol, digital, ECG, EEG, electromagnetic fields, EMG, endocrine, endpoint, EOG, exposure, frequency, growth hormone, GSM, healthy, high-frequency, hormone, human, immunoradiometric assay, in vitro, luteinizing hormone, mean value, melatonin, microwave, mobile phone, muscular, neuroendocrine system, partial body exposure, pilot/exploratory/preliminary study, placebo, polysomnography, power flux density, pulsed, PW, radiation, REM sleep, secretion, sense organs, serum, significant, skeletal, sleep, stimulus, temporal, transient

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