Abstract:
:The effects of geomagnetic disturbances on urinary excretion of the melatonin metabolite, 6-hydroxymelatonin sulfate (6-OHMS), were studied in conjunction with 60 Hz magnetic field (MF) and ambient light exposure in 132 electric utility workers. Geomagnetic activity was assessed using a local (equivalent amplitude or A(K), Boulder, CO) and global (average antipodal or aa) index. Personal exposures to 60 Hz MFs and light were obtained using data-logging meters. The relationship between geomagnetic activity and 6-OHMS was assessed with adjustment for age, light exposure, and month of participation. Mean overnight 6-OHMS excretion was lower on days when the 36-h A(K) or aa values exceeded 30 nT. A greater reduction in 6-OHMS excretion was observed when increased geomagnetic activity was combined with elevated 60 Hz MF or reduced ambient light exposures.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Burch JB,Reif JS,Yost MGdoi
10.1016/s0304-3940(99)00308-0keywords:
subject
Has Abstractpub_date
1999-05-14 00:00:00pages
209-12issue
3eissn
0304-3940issn
1872-7972pii
S0304394099003080journal_volume
266pub_type
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