TY - JOUR
T1 - Lighting up living spaces to improve mood and cognitive performance in older adults
AU - Shishegar, Nastaran
AU - Boubekri, Mohamed
N1 - Funding Information:
This work was supported by the Jim H. McClung Lighting Research Foundation.
Funding Information:
The authors would like to thank the Jim H. McClung Lighting Research Foundation for financially supporting this work. The authors would like to acknowledge Dave Meglio and Jared Ruhl of Meglio & Associates, as well as Julie Blankenheim, Ryan Wurtz, and Brian Harrison of Chicago Light Works for their technical support and assistance with lighting setups. The authors would like to thank Dr. Wendy Rogers and Dr. Elizabeth Stine-Morrow of the University of Illinois at Urbana-Champaign for their technical advice on the research design and analysis of the results. The staff and residents of the independent living centers who participated in this study are gratefully acknowledged for making this work possible. Terry Christenson is acknowledged for his editorial and proofreading service.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/8
Y1 - 2022/8
N2 - Recent studies reported that bright light exposure can impact mood and cognitive functions in various age groups. However, these studies have not adequately addressed the effects of ambient lighting in living spaces on healthy older adults. In the present study, the effects of a whole-day lighting scheme were examined in residential units inhabited by older adults. The lighting condition (LT) was designed to create a direct/indirect ambient illumination that delivered bright, blue-enriched light (illuminance level: 500 lx, Correlated Color Temperature (CCT): 6500 K) in the morning, followed by gradually lower illuminance levels and CCT throughout the rest of the day, reaching 100 lx and 2700 K in the evening. To further examine the effects of spectrum, we also included another lighting condition (LP) with the same range of illuminance levels and constant CCT of 2700 K from morning to evening. Twenty-one healthy older adults (mean age = 76.81 years; 16 females) completed a counterbalanced crossover experiment, with two baseline measurements (before and after interventions) and eighteen days of interventions. Data were collected using standardized questionnaires and tests. Significant improvements were observed in mood and cognitive functions measured after exposure to both lighting conditions (LP and LT); there were significantly greater improvements for the LT as compared to the LP condition. This study found promising evidence that a whole-day lighting scheme that follows the natural light/dark cycle could be an effective design solution to create a healthy and healing living environment in living spaces and promote mood, cognitive functions, and hence the quality of life in senior residents.
AB - Recent studies reported that bright light exposure can impact mood and cognitive functions in various age groups. However, these studies have not adequately addressed the effects of ambient lighting in living spaces on healthy older adults. In the present study, the effects of a whole-day lighting scheme were examined in residential units inhabited by older adults. The lighting condition (LT) was designed to create a direct/indirect ambient illumination that delivered bright, blue-enriched light (illuminance level: 500 lx, Correlated Color Temperature (CCT): 6500 K) in the morning, followed by gradually lower illuminance levels and CCT throughout the rest of the day, reaching 100 lx and 2700 K in the evening. To further examine the effects of spectrum, we also included another lighting condition (LP) with the same range of illuminance levels and constant CCT of 2700 K from morning to evening. Twenty-one healthy older adults (mean age = 76.81 years; 16 females) completed a counterbalanced crossover experiment, with two baseline measurements (before and after interventions) and eighteen days of interventions. Data were collected using standardized questionnaires and tests. Significant improvements were observed in mood and cognitive functions measured after exposure to both lighting conditions (LP and LT); there were significantly greater improvements for the LT as compared to the LP condition. This study found promising evidence that a whole-day lighting scheme that follows the natural light/dark cycle could be an effective design solution to create a healthy and healing living environment in living spaces and promote mood, cognitive functions, and hence the quality of life in senior residents.
KW - Cognitive performance
KW - Lighting
KW - Mood
KW - Older adults
KW - Residential spaces
UR - http://www.scopus.com/inward/record.url?scp=85133782713&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85133782713&partnerID=8YFLogxK
U2 - 10.1016/j.jenvp.2022.101845
DO - 10.1016/j.jenvp.2022.101845
M3 - Article
AN - SCOPUS:85133782713
SN - 0272-4944
VL - 82
JO - Journal of Environmental Psychology
JF - Journal of Environmental Psychology
M1 - 101845
ER -