Abstract：
:Photoperiod influences the distribution of sleep and waking and electroencephalogram (EEG) power density in the Djungarian hamster. In an experimental procedure combining short photoperiod (SP) and low ambient temperature, the light-dark difference in the amount of sleep was decreased, and the changes in slow-wave activity (SWA) (mean EEG power density between 0.75 and 4.0 Hz) in nonrapid eye movement (NREM) sleep within 24 h were abolished. These findings, obtained in three different groups of animals, suggested that at the lower ambient temperature, the influence of the circadian clock on sleep-wake behavior was diminished. However, it remained unclear whether the changes were due to the photoperiod, ambient temperature, or both. Here, the authors show that EEG and electromyogram recordings in a single group of animals sequentially adapted to a short and long photoperiod (LP) at low ambient temperature (approximately 15 degrees C) confirm that EEG power is reduced in SP. Moreover, the nocturnal sleep-wake behavior and the changes in SWA in NREM sleep over 24 h were restored by returning the animals to LP and retaining ambient temperature at 15 degrees C. Therefore, the effects cannot be attributed to ambient temperature alone but are due to a combined effect of temperature and photoperiod. When the Djungarian hamster adapts to winter conditions, it appears to uncouple sleep regulation from the circadian clock.
journal_name
J Biol Rhythmsjournal_title
Journal of biological rhythmsauthors
Deboer T,Vyazovskiy VV,Tobler Idoi
10.1177/074873040001500508subject
Has Abstractpub_date
2000-10-01 00:00:00pages
429-36issue
5eissn
0748-7304issn
1552-4531journal_volume
15pub_type
杂志文章abstract：:Although pineal "synaptic" ribbons (SR) are frequently examined by means of quantitative electron microscopy, their functional significance remains unclear. The same is true for related structures--"synaptic" spherules (SPH). In the course of such studies, it has been noted that SR counts may differ from laboratory to...
journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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doi：10.1177/074873049801300504
更新日期：1998-10-01 00:00:00
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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更新日期：1995-09-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
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更新日期：2003-06-01 00:00:00
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pub_type： 杂志文章
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更新日期：2001-10-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：1989-07-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：2005-02-01 00:00:00
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pub_type： 杂志文章
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更新日期：2005-10-01 00:00:00
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journal_title：Journal of biological rhythms
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doi：10.1177/074873049501000104
更新日期：1995-03-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：2015-06-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：2006-12-01 00:00:00
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更新日期：2015-04-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：1993-04-01 00:00:00
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更新日期：2015-06-01 00:00:00
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更新日期：1995-06-01 00:00:00
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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更新日期：2016-04-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
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更新日期：1993-01-01 00:00:00
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更新日期：1999-06-01 00:00:00
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更新日期：2020-08-01 00:00:00
