Effect of Personalized Blue-Enriched White Light Intervention on Rest–Activity and Light Exposure Rhythms in Mild and Moderate Alzheimer’s Disease
- Author:
Seong Jae KIM
1
;
Jung Hie LEE
;
Jae-Won JANG
;
Sun Hee LEE
;
In Bum SUH
;
Jin Hyeong JHOO
Author Information
- Publication Type:Original Article
- From:Psychiatry Investigation 2023;20(11):1007-1017
- CountryRepublic of Korea
- Language:English
-
Abstract:
Objective:We aimed to examine the effectiveness of personalized light intervention using a blue-enriched light-emitting-diodes device on rest–activity rhythm (RAR) and light exposure rhythm (LER) in patients with mild and moderate Alzheimer’s disease (AD).
Methods:AD patients with poor sleep quality and/or insomnia symptoms were assigned into either an experimental group (EG) or control group (CG) in a single-blind design. Personalized light intervention was given at 9–10 h after individual dim light melatonin onset, lasting for 1 h every day for two weeks in the EG (77.36±5.79 years, n=14) and CG (78.10±7.98 years, n=10). Each patient of CG wore blue-attenuating sunglasses during the intervention. Actigraphy recording at home for 5 days was done at baseline (T0), immediate postintervention (T1), and at four weeks after intervention (T2). The variables of RAR and LER were derived using nonparametric analysis.
Results:We found a significant time effect on the intradaily variability (IV) of RAR at T2 with respect to T0 (p=0.039), indicating reduced IV of RAR at four weeks after personalized light intervention regardless of blue-enriched light intervention. There was a time effect on the IV of LER at T1 with respect to T0 (p=0.052), indicating a reduced tendency in the IV of LER immediately after intervention.
Conclusion:Our personalized light intervention, regardless of blue-enriched light source, could be useful in alleviating fragmentation of RAR and LER in AD patients.
