School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.
Graduate Institute of Clinical Medicine, Collage of Medicine, Taipei Medical University, Taipei, Taiwan.
J Sleep Res. 2019 Oct;28(5):e12724. doi: 10.1111/jsr.12724. Epub 2018 Jul 9.
Circadian rhythms and napping habits have been associated with cognitive function; however, little is known about the interaction effects on cognitive function. The present study examined the moderating effects of napping habits on the relationship between chronotypes and cognitive function decline in elderly adults. This cross-sectional study analysed data from the 2009 Taiwan National Health Interview Survey. A total of 1,724 elderly adults (aged ≥65 years) were included. Cognitive function was determined by the Mini-Mental State Examination. Participants' chronotypes were assessed using the midpoint of sleep. Napping habits were assessed by self-report questions. Demographic data, health-related factors and sleep characteristics of the participants were also assessed as potential confounding factors. A hierarchical regression will be used to test the moderating role of napping habits in the relationship between chronotype and cognitive function level after adjustment for potential confounders. A significant interaction effect between chronotype and napping habits was observed with the MMSE score (b = -0.29, SE = 0.14, p = 0.03). Morning-type elderly patients with nap durations >60 min exhibited significantly higher MMSE scores than non-nappers (F = 7.48; p = 0.00). This nationwide survey confirms that in morning-type elderly adults, nap durations >60 min are associated with less cognitive decline; however, napping habits are not associated with cognitive function level in evening-type and intermediate-type elderly adults.
昼夜节律和午睡习惯与认知功能有关；然而，关于它们对认知功能的交互作用知之甚少。本研究探讨了午睡习惯对老年人中睡眠类型与认知功能下降之间关系的调节作用。本横断面研究分析了 2009 年台湾全国健康访谈调查的数据。共纳入 1724 名老年人（年龄≥65 岁）。认知功能通过简易精神状态检查确定。参与者的睡眠类型通过睡眠中点评估。午睡习惯通过自我报告问题评估。参与者的人口统计学数据、与健康相关的因素和睡眠特征也被评估为潜在的混杂因素。在调整潜在混杂因素后，将使用分层回归检验午睡习惯在睡眠类型与认知功能水平之间关系中的调节作用。观察到睡眠类型和午睡习惯与 MMSE 评分之间存在显著的交互作用（b=-0.29，SE=0.14，p=0.03）。午睡时间>60 分钟的晨型老年患者的 MMSE 评分明显高于非午睡者（F=7.48；p=0.00）。这项全国性调查证实，在晨型老年人中，午睡时间>60 分钟与认知下降程度较低有关；然而，午睡习惯与夜间型和中间型老年人的认知功能水平无关。
