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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.
|ばく露時間||repeated daily exposure, 2 h/day, 5 days/week, for 4 weeks|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
|チャンバの詳細||During the exposure sessions, the attention of the volunteers and a correct normal use position of the mobile phone were maintained by TV projection of movies. The audio signal from the TV set was distributed to four fixed telephones that could be called from the GSM handsets to hear the movie soundtrack.|
|ばく露装置の詳細||For each subject, exposure was on the same side of the head for all sessions.|
|Sham exposure||A sham exposure was conducted.|
|Additional information||A sham exposure was also performed on the days of the first and the last blood drawing sessions by switching the RF output to a 50-Ω dummy load instead of the antenna and presenting the movie sound directly on the TV speakers.|
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.