PMID: 9429342Jan 16, 1998Paper

Exposure to bright light for several hours during the daytime lowers tympanic temperature

International Journal of Biometeorology
S Aizawa, H Tokura

Abstract

The present study investigates the effect on thympanic temperature of exposure to different light intensities for several hours during the daytime. Nine healthy young adult volunteers (two male, seven female) were exposed to bright light of 4000 lx or dim light of 100 lx during the daytime from 0930 to 1800 hours; the light condition was then kept at 100 lx for a further hour. Tympanic temperature was measured continuously at a neutral condition (28 degrees C, 60% relative humidity) from 1000 to 1800 hours. Urinary samples were collected from 1100 to 1900 hours every 2 h, and melatonin excretion rate was measured by enzyme immunoassay. Of nine subjects, six showed clearly lower tympanic temperatures in the bright compared with the dim condition from 1400 to 1800 hours. Average tympanic temperatures were significantly lower in the bright than in the dim condition from 1645 to 1800 hours. Melatonin excretion rate tended to be higher in the bright than in the dim condition. It was concluded that exposure to bright light of 4000 lx during the daytime for several hours could reduce tympanic temperature, compared with that measured in dim light of 100 lx.

Citations

Mar 3, 1999·Applied Human Science : Journal of Physiological Anthropology·S J Park, H Tokura
Sep 9, 2000·Journal of Physiological Anthropology and Applied Human Science·H E Kim, H Tokura
Feb 3, 2005·Journal of Physiological Anthropology and Applied Human Science·Hiromi Tokura, Hee-Eun Kim
May 9, 2006·Journal of Physiological Anthropology·Ki-Ja HyunHiromi Tokura
Jul 15, 2015·Acta Physiologica·M te KulveW D van Marken Lichtenbelt
Jul 25, 2003·Prehospital Emergency Care : Official Journal of the National Association of EMS Physicians and the National Association of State EMS Directors·Edward T DickinsonC Crawford Mechem

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