Seasonal and Regional Differences in Lighting Conditions and their Influence on Melatonin Secretion

Błażejczyk Krzysztof (), Morita Takeshi, Ueno-Towatari Tomoko, Błażejczyk Anna and Wieczorek Joanna
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Błażejczyk Krzysztof: Institute of Geography and Spatial Organization, Polish Academy of Sciences, Warsaw, Poland
Morita Takeshi: Tomoko Ueno-Towatari, Fukuoka Woman University, Fukuoka, Japan
Ueno-Towatari Tomoko: Tomoko Ueno-Towatari, Fukuoka Woman University, Fukuoka, Japan
Błażejczyk Anna: Bioklimatologia, Laboratory of Bioclimatology and Environmental Ergonomics, Warsaw, Poland
Wieczorek Joanna: Bioklimatologia, Laboratory of Bioclimatology and Environmental Ergonomics, Warsaw, Poland

Quaestiones Geographicae, 2014, vol. 33, issue 3, 17-25

Abstract: The paper presents essential results of multidisciplinary research dealing with differences in lighting conditions (natural and/or artificial) and their possible influence on melatonin secretion studied in Fukuoka (Japan) and in Warszawa (Poland). Several characteristics of lighting were considered (intensity of global 0.4-3.0 μm, visible 0.4 0.76 μm solar radiation, illuminance (lux), peak irradiance (μW∙cm−2∙nm−1), Color Corresponded Temperature (CCT, K) and peak wave length (nm)). Diurnal cycle of melatonin secretion was examined at volunteers (Poland - 15, Japan - 18), young male and female (21-33 years). Saliva samples were collected at 3h intervals, beginning at 10:00h on Thursday with subsequent sampling times at 13:00, 16:00, 19:00, 22:00 and at 01:00, 04:00 07:00h on Friday. Melatonin concentration (MC) was measured by commercials ELISA kit tests.

Keywords: visible radiation; lighting conditions; radiation climate of Poland and Japan; melatonin secretion; chronobiology (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:vrs:quageo:v:33:y:2014:i:3:p:17-25:n:12

DOI: 10.2478/quageo-2014-0026

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