Combined Influences of Gradual Changes in Room Temperature and Light around Dusk and Dawn on Circadian Rhythms of Core Temperature, Urinary 6-Hydroxymelatonin Sulfate and Waking Sensation Just after RisingReport as inadecuate




Combined Influences of Gradual Changes in Room Temperature and Light around Dusk and Dawn on Circadian Rhythms of Core Temperature, Urinary 6-Hydroxymelatonin Sulfate and Waking Sensation Just after Rising - Download this document for free, or read online. Document in PDF available to download.

Collegium antropologicum, Vol.31 No.2 April 2007. -

The present experiment aimed at knowing how a gradual changes of room temperature Ta and light in the evening

and early morning could influence circadian rhythms of core temperature Tcore, skin temperatures, urinary 6-hydroxymelatonin

sulfate and waking sensation just after rising in humans. Two kinds of room environment were provided

for each participant: 1 Constant room temperature Ta of 27 °C over the 24 h and LD-rectangular light change with

abrupt decreasing from 3,000 lx to100 lx at 1800,abrupt increasing from 0 lx to 3,000 lx at 0700. 2 Cyclic changes of Ta

and with gradual decrease from 3,000 lx to 100 lx onset at 1700 twilight period about 2 h, with gradual increasing from

0 lx to 3,000 lx onset at 0500 about 2 h. Main results are summarized as follows: 1 Circadian rhythms of nadir in the

core temperature Tcore significantly advanced earlier under the influence of gradual changes of Ta and light than no

gradual changes of Ta and light. 2 Nocturnal fall of Tcore and morning rise of Tcore were greater and quicker, respectively,

under the influence of gradual changes of Ta and light than no gradual changes of Ta and light. 3 Urinary 6-hydroxymelatonin

sulfate during nocturnal sleep was significantly greater under the influence of gradual changes of Ta and

light. 4 Waking sensation just after rising was significantly better under the influence of gradual changes of Ta and

light. We discussed these findings in terms of circadian and thermoregulatory physiology.

circadian rhythms; core temperature; skin temperatures; urinary 6-hydroxymelatonin; waking sensation



Author: Masayuki Kondo - Hiromi Tokura - Tomoko Wakamura - Ki-Ja Hyun - Satoshi Tamotsu - Takeshi Morita - Tadashi Oishi -

Source: http://hrcak.srce.hr/



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