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

Author

Listed:
  • Błażejczyk Krzysztof

    (Institute of Geography and Spatial Organization, Polish Academy of Sciences, Warsaw, Poland)

  • Morita Takeshi
  • Ueno-Towatari Tomoko

    (Tomoko Ueno-Towatari, Fukuoka Woman University, Fukuoka, Japan)

  • Błażejczyk Anna
  • Wieczorek Joanna

    (Bioklimatologia, Laboratory of Bioclimatology and Environmental Ergonomics, Warsaw, Poland)

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.

Suggested Citation

  • Błażejczyk Krzysztof & Morita Takeshi & Ueno-Towatari Tomoko & Błażejczyk Anna & Wieczorek Joanna, 2014. "Seasonal and Regional Differences in Lighting Conditions and their Influence on Melatonin Secretion," Quaestiones Geographicae, Sciendo, vol. 33(3), pages 17-25, September.
    • Handle: RePEc:vrs:quageo:v:33:y:2014:i:3:p:17-25:n:12
    DOI: 10.2478/quageo-2014-0026
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