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Bright Light Therapy and Circadian Cycles in Institutionalized Elders
José A Rubiño1, Antoni Gamundí1, Mourad Akaarir1
1Laboratori de Neurofisiologia del Son i Ritmes Biològics, Institut d'Investigació Sanitária Illes Balears (IDISBA), Universitat Illes Balears (UIB), Palma de Mallorca, Spain.
Frontiers in Neuroscience
|May 22, 2020
Summary
Bright light therapy (BLT) significantly improved circadian rhythms, sleep quality, and cognitive function in institutionalized elderly individuals. This short, five-day intervention offers an effective, non-pharmacological treatment for age-related health disturbances.
Area of Science:
- Gerontology
- Chronobiology
- Cognitive Neuroscience
Background:
- Institutionalized elders often experience reduced diurnal light exposure, negatively impacting circadian rhythms, cognition, and health.
- Disruptions in circadian rhythms are common in aging populations and can exacerbate cognitive decline.
Purpose of the Study:
- To investigate the impact of a brief, five-day morning bright light therapy (BLT) intervention on institutionalized elderly individuals with mild to moderate cognitive impairment.
- To assess changes in circadian variables, cognitive performance, and sleep quality following BLT.
Main Methods:
- A cohort of 37 institutionalized elderly subjects (aged 70-93) participated in a three-week study.
- During the second week, participants received daily 90-minute sessions of BLT (7000-10,000 lux).
- Cognition, attention, sleep quality, and circadian variables were measured using validated, non-invasive methods before and after the intervention.
Main Results:
- Significant improvements were observed in general cognitive capabilities and sleep quality after the BLT intervention.
- Key parameters of the subjects' circadian rhythms also showed significant positive changes.
- A short duration of BLT (90 minutes daily for five days) demonstrated a notable impact on multiple health and cognitive factors.
Conclusions:
- Bright light therapy presents an accessible, rapid, and effective treatment for age-related circadian rhythm disturbances.
- BLT offers advantages over pharmacological treatments for elderly individuals.
- The observed improvements are hypothesized to stem from the activation of the subjects' circadian system.
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