Sleep fragmentation in mentally retarded people decreases with increasing daylength in spring
Sleep fragmentation in mentally retarded people decreases with increasing daylength in spring
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随着春季日照长度的增加，智障人士的睡眠碎片化程度降低
DOI：
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发表时间：
2002
影响因子：
2.8
通讯作者：
M. Laakso
中科院分区：
文献类型：
--
作者：
N. Lindblom;H. Heiskala;M. Kaski;L. Leinonen;M. Laakso
我们研究了60°N下冬末夏初弱智人群的睡眠-觉醒行为。在此期间，日长增加了8小时51分钟。数据是通过观察293名受试者在五个随机的24小时期间(=记录天数)以20分钟为间隔的睡眠-觉醒状态来收集的。同一顺序的单个录制天数(1、2等)的间隔都是进行的，被称为记录期。因此，有五个记录期，每个记录期包含293个单独的记录日。尽管记录时段之间存在重叠，但从一个时段到另一个时段的中位数日长增加了大约100分钟。在最初的统计分析中，发现觉醒-睡眠转换的次数在五个记录期之间有显著差异(弗里德曼检验，p<；0.001)。弗里德曼测验的平均等级表明，觉醒-睡眠转换的次数在第一个记录期最高，在第五个记录期最低。在使用混合效应回归分析程序(MIXOR 2.0)进行的进一步统计分析中，发现在研究期间白天长度的增加与整个研究人群中同时减少大约0.5%的觉醒-睡眠转变有关(p<；0.001)。只有在第一天和第五天之间日长变化超过350min的受试者亚组中，醒觉-睡眠转换次数的减少是显著的(Wilcoxon test，p<；0.005)。这表明，在自然光周期显著延长之后，睡眠周期的减少比白天长度的较小变化更有可能发生。结论是，居住在北纬康复中心的智力低下者，冬季的睡眠比初夏更为零碎，这种变化可能与自然光周期的同时增加有关。在较暗的季节，通过增加每天人工光照的强度和/或持续时间，可以改善居住在机构环境中的人的睡眠质量。
We studied the sleep–wake behavior of mentally retarded people from late winter to early summer at 60°N. During this time the daylength increased 8 h 51 min. The data were collected by observing the sleep–wake status of 293 subjects at 20-min intervals for five randomized 24h periods (=recording days). The intervals during which the individual recording days of the same order (1st, 2nd, etc.) were carried out, were called recording periods. Consequently, there were five recording periods, each containing 293 individual recording days. Even though there was overlap among the recording periods, the median daylength from one period to another increased approximately by 100 min. In the initial statistical analysis, the number of wake–sleep transitions was found to differ significantly among the five recording periods (Friedman test, p<0.001). The mean ranks in the Friedman test suggested that the number of wake–sleep transitions was highest during the 1st and lowest during the 5th recording period. In further statistical analyses using a program for mixed effects regression analysis (mixor 2.0) it was found that the increase in daylength during the study period was associated with a simultaneous decrease of approximately 0.5 wake–sleep transitions in the whole study population (p<0.001). The decrease in the number of wake–sleep transitions was significant only in the subgroups of subjects with a daylength change of more than 350 min between the 1st and 5th recording days (Wilcoxon tests, p<0.005). This suggests that after a marked prolongation of the natural photoperiod, the reduction in sleep episodes was more probable than after smaller changes in daylength. It is concluded that the sleep of mentally retarded people living in a rehabilitation center at a northern latitude is more fragmented in winter than in early summer and that the change is related probably to the simultaneous increase in the length of the natural photoperiod. The sleep quality of persons living in institutional settings might be improved by increasing the intensity and/or duration of daily artificial light exposure during the darker seasons.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
Terman, M;Terman, JS;Ross, DC
通讯作者：
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