Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
Geriatr Gerontol Int. 2013 Jul;13(3):798-806. doi: 10.1111/ggi.12021. Epub 2012 Dec 26.
To measure illuminance in the home lives of elderly people to clarify the current state of affairs and concurrently investigate quantification methods for this purpose.
Illuminance and the physical and mental health of 24 elderly people living, with some assistance, in their homes in a prefecture in the Hokuriku region were studied over 3 days. Illuminance was quantified in accordance with the rotation of the earth, with day and night defined according to times of sunrise/sunset. Daytime mean illuminance and mean time exposed to seven levels of illuminance between 50 and 1000 lx during the day were calculated. Physical and mental health were assessed through interviews using the Instrumental Activities of Daily Living Scale, the Short-Form 36-Item Health Survey version 2, the Philadelphia Geriatric Center Morale Scale and the Geriatric Depression Scale-Short Form. Analysis of the correlation between illuminance and scores on mental and physical health was carried out.
The mean score for daytime illuminance was 687 lx. The mean time for daytime exposure to light above 400 lx was 59 min. A significant positive correlation was found between daytime mean illuminance, time exposed to light over 400 lx and life satisfaction. A significant negative correlation was found between time exposed to light over 400 lx and depression scores.
Findings uncovered for the first time the actual illumination experienced by frail elderly individuals living at home in Japan. The quantification of illuminance is important, because research has shown a relationship between mental health and illuminance exposure.
测量老年人家庭生活中的照度，阐明当前的状况，并同时调查为此目的的量化方法。
研究了生活在本州北部地区一个县家中、需要一定帮助的 24 名老年人的照度和身心健康情况，为期 3 天。根据地球的自转来量化照度，根据日出/日落时间来定义白天和黑夜。计算白天的平均照度和白天暴露在 50 到 1000lx 之间的 7 个照度水平的平均时间。通过使用日常生活活动量表、36 项简短健康调查第二版、费城老年中心士气量表和老年抑郁量表简短版进行访谈来评估身心健康。分析了照度与心理健康和身体状况评分之间的相关性。
白天平均照度的平均值为 687lx。白天暴露在 400lx 以上光线的平均时间为 59 分钟。白天平均照度、暴露在 400lx 以上光线的时间与生活满意度呈显著正相关。暴露在 400lx 以上光线的时间与抑郁评分呈显著负相关。
首次揭示了日本生活在家中的体弱老年人的实际照度。照度的量化很重要，因为研究表明心理健康与照度暴露之间存在关系。
