Shedding light on light exposure in elderly with intellectual disabilities.
M N Böhmer, M J Valstar, M P J Aarts and 4 others
PMID 33594722WHAT IT FOUND
Elderly people with intellectual disabilities in group homes spend their day in low light.
They rarely get the bright exposure linked to better sleep and mood, especially on weekends. This is a descriptive finding, not proof that lighting changes cause their health issues.
Key findings
01The average light exposure during the waking day was 155 lux, with participants spending a median of only 32 minutes in light above 1000 lux.
02Only about half of the participants met the light exposure thresholds associated with better sleep efficiency and mood on most days.
03Light exposure was significantly lower during weekends compared to weekdays, with far fewer days meeting the beneficial thresholds.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study is descriptive and cross-sectional. It cannot prove that low light exposure causes sleep or mood problems in this group. There was a large amount of missing data due to sensor issues, such as the light sensor being covered by clothing or worn incorrectly. The light exposure thresholds used for comparison were derived from general population studies, not from people with intellectual disabilities. Medical status and psychiatric diagnoses were not recorded, so the researchers could not control for conditions that might affect sleep or light sensitivity. The study did not measure the spectral quality of the light, only the intensity in lux.
Declared interests
The authors declared no conflicts of interest. The study was supported by non-US government funding.
The easy way to misread this
Do not conclude that increasing light exposure will definitely improve sleep or mood in these patients. This study only measured current exposure levels; it did not test whether changing them produces a clinical benefit.