Sponsor: Jim H. McClung Lighting Research Foundation
Team: Nina Sharp (PI), Mohamed Boubekri (PI)
In this study, we examine the effectiveness of two whole-day lighting interventions on improving sleep quality, mood, and cognitive performance in community-dwelling older adults. We apply lighting interventions in older adults’ living rooms to provide a range of illuminance levels and spectrum (CCTs) that change throughout the day. The lighting interventions are designed based on the light/dark cycle to suit older adults’ specific circadian lighting needs. The study’s first aim is to explore the effectiveness of a whole-day lighting scheme with a range of illumination and constant spectrum on subjective and objective measures of sleep, mood, and cognition. The second aim is to determine whether adding color tuning quality to the whole-day lighting scheme with varying illuminance levels would provide any additional benefits to the dependent variables.
Study Design: Counterbalanced crossover
Tools: Actigraphy, PSQI, ESS, GDS, PANAS, DSST, TMT-A & B
Outcomes: Sleep duration, sleep efficiency, Depression, Mood, Cognitive Performance
Shishegar, N., and Boubekri, M. (2022). Lighting up living spaces to improve mood and cognitive performance in older adults. Journal of Environmental Psychology, 101845. https://doi.org/10.1016/j.jenvp.2022.101845
Shishegar, N. and Boubekri, M. (2022). An investigation of light spectrum and intensity on depression among Older Adults, International Journal of Advances in Science, Engineering and Technology (IJASEAT), 10 (1).
Shishegar, N. Boubekri, M., Rogers, W., and Stine-Morrow, E. (2021). Tuning Ambient Illumination Improve Objective and Subjective Sleep in Healthy Older Adults, Building and Environment, 204. https://doi.org/10.1016/j.buildenv.2021.108096