| Author: | Tsang Lau, Kit Ping Alice |
| Title: | Relationship between lighting exposure and behaviours in activities of daily living in elders with dementia residing in old age homes in Hong Kong |
| Advisors: | Fong, Kenneth (RS) |
| Degree: | DHSc |
| Year: | 2024 |
| Subject: | Dementia -- Patients -- Care Circadian rhythms Lighting -- Health aspects Sleep -- Health aspects Hong Kong Polytechnic University -- Dissertations |
| Department: | Faculty of Health and Social Sciences |
| Pages: | viii, 75 pages : color illustrations |
| Language: | English |
| Abstract: | Background and purpose: Lighting is known to be a factor that contributes to disturbed circadian rhythm in people with dementia (PwD), while sleep quality was found to be a factor that could influence behavioural and psychological symptoms of dementia (BPSD). In this study, I examined the relationship between ambient light exposure in terms of light exposure, temperature, and colour, and sleep quality, with BPSD, including aggression, anxiety, agitation, irritability, etc., cognitive performance, and psychological well-being of PwD residing in homes for the elderly in Hong Kong. Sleep quality and activities are used to identify the status of their circadian rhythm. Methods: This was a cross-sectional study, with 41 participants recruited by convenience sampling from seven homes for the elderly in various districts in Hong Kong. Questionnaires were completed by both PwD and their carers to measure sleep quality and BPSD of PwD, respectively. Cognitive function was assessed using the Hong Kong version of the Montreal Cognitive Assessment (HK-MoCA). PwD’s light exposure was measured using wearable light sensors and monitored over a 24-hour period; measurements were stratified into four time sessions for Pearson correlation analysis. The significance level was set at p ≤ 0.01 according to the Bonferroni correction = α/n, where n is the number of variables. Further analysis by way of stepwise forward linear regression and logistic regression were used to find the predictive factors of light exposure, and others that contributed to sleep quality or BPSD of PwD. Results: The results showed that light exposure (Lux) of PwD in the afternoon (1200-1759 hrs) was a significant predictor of sleep problems with an odds ratio of 0.99 and of overall sleep quality as measured by The Pittsburgh Sleep Quality Index (PSQI) score with a B value of 8.313 and a negative coefficient of -0.009, which explains 36% of the total variance. Further, light exposure (Lux) at 1200-1759 hrs and BPSD, as measured using the NPI total score, were significant predictors of sleep score, with a B value of 7.398, and coefficients of -0.009 and 0.070, respectively, and explains 49.2% of the total variance. Light temperature and light colour were not related to sleep quality and psychological well-being. There is a significant positive moderate correlation between activity levels during or after bedtime, particularly physical aggression and verbal agitation of PwD. Conclusion: Sleep quality and light exposure are possible factors to consider when planning behavioural management for PwD residing at homes for the elderly in Hong Kong. Further design of ambient lighting at homes for the elderly is recommended to produce a beneficial effect on sleep quality for PwD as well as reducing stress for carers. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8006.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.21 MB | Adobe PDF | View/Open |
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