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Medical/biological Study (experimental study)

Influence of electromagnetic fields emitted by GSM-900 cellular telephones on the circadian patterns of gonadal, adrenal and pituitary hormones in men. med./biol.

By: Djeridane Y, Touitou Y, de Seze R
Published in: Radiat Res 2008; 169 (3): 337 - 343 ( open external web page PubMed Entry , open external web page Journal web site )

Aim of study (according to author)
This study should examine whether the exposure to 900 MHz GSM electromagnetic fields induces changes in hormone levels in men.
Background/further details:
20 healthy male volunteers in the age of 20 to 32 years participated in this study. To account physiological circadian alterations in the hormone levels blood samples were collected hourly during the night and every 3 hours during the day. Each individual's hormone concentration before the exposure was used as his control.

Endpoint

Exposure
General category: digital mobile phone, GSM

Field characteristicsParameters
900 MHz
pulsed (PW)
exposure duration: repeated daily exposure, 2 h/day, 5 days/week, for 4 weeks		power: 2 W peak value
SAR: 0.3 W/kg average over time (10 g) (in the temporal brain)

FIELD View further expo parameters

Exposed system:
human
partial body exposure: consistent one side of the head

Methods
Endpoint/Measurement parameters/Methodology

investigated material: blood
investigation on living organism
investigated organ system: endocrine system

time of investigation: before, during and after exposure

Main outcome of study (according to author)
There were significant decreases in growth hormone and cortisol levels in the 2-week exposure period and for growth hormone additionally in the 4-week exposure period. However, these differences did not persist in the period after the exposure.
No changes were observed in other investigated hormones neither in hormone concentration nor in circadian pattern.

(Study character: medical/biological study, experimental study, full/main study)

Study funded by

  • Motorola

Related articles i
Glossary: adrenocorticotropic hormone, biological, blood, brain, circadian, cortisol, digital, electromagnetic fields, endocrine, endocrine system, endpoint, exposure, full/main study, growth hormone, GSM, healthy, hormone, human, immunofluorescence, MHz, mobile phone, partial body exposure, physiological, power, prolactin, pulsed, PW, SAR, significant, temporal, testosterone, thyroid stimulating hormone

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