The study group consisted of 28 babies who had spent at least 48 h in incubators. 6-hydroxymelatoninsulfate (6-OHMS) urine excretion (normalized to creatinine) was measured at the end of their stay in the incubators and 48 h later when they have been in cribs where electromagnetic fields were below the detectable limit.
The control group consisted of 27 babies who were not exposed to electromagnetic fields. Two urine samples were collected (taken 48 h apart from each other).
|Exposure 1: 50 Hz||
|magnetic flux density||0.458 µT||-||measured||-||center of the matress (at minimum engine power)|
|magnetic flux density||0.45 µT||-||measured||-||periphery of the matress (at minimum engine power)|
|magnetic flux density||8.84 µT||-||measured||-||center of the matress (at maximum engine power)|
|magnetic flux density||0.97 µT||-||measured||-||periphery of the matress (at maximum engine power)|
Mean 6-hydroxymelatoninsulfate values were increased 48 h after the exposed babies were removed from the incubators and put into the cribs. In the control group, mean 6-hydroxymelatoninsulfate values were not significantly different in the first and in the second sample and similar to the first value of the exposed babies in the incubator.
The authors conclude that the transient increase in melatonin production after removing newborns from incubators demonstrates a possible influence of electromagnetic fields on melatonin production in newborns.