Our study examined the association between chronotype, daily physical activity, and the estimated risk of dementia in 170 community-dwelling older adults. Chronotype was assessed with the Horne–Östberg Morningness–Eveningness Questionnaire (MEQ). Daily physical activity (of over 3 METs) was measured with a tri-axial accelerometer. The Korean version of the Mini-Mental State Examination (K-MMSE) was used to measure the estimated risk of dementia. The evening chronotype, low daily physical activity, and dementia were positively associated with each other. The participants with low physical activity alongside evening preference had 3.05 to 3.67 times higher estimated risk of developing dementia, and participants with low physical activity and morning preference had 1.95 to 2.26 times higher estimated risk than those with high physical activity and morning preference. Our study design does not infer causation. Nevertheless, our findings suggest that chronotype and daily physical activity are predictors of the risk of having dementia in older adults aged 70 years and above.

中文翻译：

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社区居民老年人的时间型，体育活动与痴呆估计风险之间的关系。

我们的研究检查了170位居住在社区中的老年人的表型，日常体育活动和痴呆症的估计风险之间的关联。用霍恩-奥斯伯格《早晨-傍晚调查表》（MEQ）评估表型。用三轴加速度计测量每日身体活动（超过3 METs）。韩国版的迷你精神状态检查（K-MMSE）用于测量估计的痴呆风险。晚上的表型，日常体育活动低和痴呆症之间呈正相关。身体活动量少且晚上偏爱的参与者罹患痴呆症的估计风险高3.05至3.67倍，身体活动量少和早上偏爱的参与者则有1.95至2。估计的危险度是高运动量和早晨偏好的人群的26倍。我们的研究设计不会推断因果关系。然而，我们的研究结果表明，表型和日常体育锻炼是70岁及以上老年人罹患痴呆症风险的预测指标。