The human circadian clock's seasonal adjustment is disrupted by daylight saving time
The human circadian clock's seasonal adjustment is disrupted by daylight saving time
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DOI：
10.1016/j.cub.2007.10.025
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发表时间：
2007-11-20
期刊：
影响因子：
9.2
通讯作者：
Roenneberg, Till
中科院分区：
文献类型：
--
作者：
Kantermann, Thomas;Juda, Myriam;Roenneberg, Till
世界上四分之一的人口每年两次受到1小时的时间变化（夏令时，DST）。这反映了社会时钟的变化，而不是环境时钟的变化（例如，黎明）。DST的影响知之甚少。昼夜节律钟利用日光来同步（携带）生物体的环境。卷吸是如此精确，以至于人类在给定的时区内适应了黎明的东西走向[1]。在一项大型调查（n = 55，000）中，我们发现，在标准时间下，自由日的睡眠时间遵循黎明的季节性进展，但在DST下则不然。在第二项研究中，我们分析了50名受试者在每次DST转换前后8周的睡眠和活动时间，这些受试者进行了时间分型（分析了他们的个别夹带阶段[2]）。这两个参数很容易调整到秋季从夏令时释放，但活动的时间不调整到夏令时实施在春季，特别是在晚chronotypes。我们的数据表明，人类的昼夜节律系统不适应夏令时，其季节性适应不断变化的光周期被破坏的引入夏令时。这种破坏可能会扩展到人类季节性生物学的其他方面。
A quarter of the world's population is subjected to a 1 hr time change twice a year (daylight saving time, DST). This reflects a change in social clocks, not environmental ones (e.g., dawn). The impact of DST is poorly understood. Circadian clocks use daylight to synchronize (entrain) to the organism's environment. Entrainment is so exact that humans adjust to the east-west progression of dawn within a given time zone [1]. In a large survey (n = 55,000), we show that the timing of sleep on free days follows the seasonal progression of dawn under standard time, but not under DST. In a second study, we analyzed the timing of sleep and activity for 8 weeks around each DST transition in 50 subjects who were chronotyped (analyzed for their individual phase of entrainment [2]). Both parameters readily adjust to the release from DST in autumn but the timing of activity does not adjust to the DST imposition in spring, especially in late chronotypes. Our data indicate that the human circadian system does not adjust to DST and that its seasonal adaptation to the changing photoperiods is disrupted by the introduction of summer time. This disruption may extend to other aspects of seasonal biology in humans.