Int J Health Geogr - A cross-sectional analysis of light at night, neighborhood sociodemographics and urinary 6-sulfatoxymelatonin concentrations: implications for the conduct of health studies.

Tópicos

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Resumo

CKGROUND: There is accumulating evidence that circadian disruption, mediated by alterations in melatonin levels, may play an etiologic role in a wide variety of diseases. The degree to which light-at-night (LAN) and other factors can alter melatonin levels is not well-documented. Our primary objective was to evaluate the degree to which estimates of outdoor environmental LAN predict 6-sulftoxymelatonin (aMT6s), the primary urinary metabolite of melatonin. We also evaluated other potential behavioral, sociodemographic, and anthropomorphic predictors of aMT6s.METHODS: Study participants consisted of 303 members of the California Teachers Study who provided a 24-hour urine specimen and completed a self-administered questionnaire in 2000. Urinary aMT6s was measured using the B?hlmann ELISA. Outdoor LAN levels were estimated from satellite imagery data obtained from the U.S. Defense Meteorological Satellite Program's (DMSP) Operational Linescan System and assigned to study participants' geocoded residential address. Information on other potential predictors of aMT6s was derived from self-administered surveys. Neighborhood socioeconomic status (SES) was based on U.S. Census block group data.RESULTS: Lower aMT6s levels were significantly associated with older age, shorter nights, and residential locations in lower SES neighborhoods. Outdoor sources of LAN estimated using low-dynamic range DMSP data had insufficient variability across urban neighborhoods to evaluate. While high-dynamic range DMSP offered much better variability, it was not significantly associated with urinary aMT6s.CONCLUSIONS: Future health studies should utilize the high-dynamic range DMSP data and should consider other potential sources of circadian disruption associated with living in lower SES neighborhoods.

Resumo Limpo

ckground accumul evid circadian disrupt mediat alter melatonin level may play etiolog role wide varieti diseas degre lightatnight lan factor can alter melatonin level welldocu primari object evalu degre estim outdoor environment lan predict sulftoxymelatonin amt primari urinari metabolit melatonin also evalu potenti behavior sociodemograph anthropomorph predictor amtsmethod studi particip consist member california teacher studi provid hour urin specimen complet selfadminist questionnair urinari amt measur use bhlmann elisa outdoor lan level estim satellit imageri data obtain us defens meteorolog satellit program dmsp oper linescan system assign studi particip geocod residenti address inform potenti predictor amt deriv selfadminist survey neighborhood socioeconom status ses base us census block group dataresult lower amt level signific associ older age shorter night residenti locat lower ses neighborhood outdoor sourc lan estim use lowdynam rang dmsp data insuffici variabl across urban neighborhood evalu highdynam rang dmsp offer much better variabl signific associ urinari amtsconclus futur health studi util highdynam rang dmsp data consid potenti sourc circadian disrupt associ live lower ses neighborhood

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