To examine the change in balance that occurs in older individuals when exposed to different colored lights at night.
Study Type
INTERVENTIONAL
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
21
\~200 lux of broad spectrum white light
\~28 lux of broad spectrum white light
\<0.5 lux of broad spectrum white light
VA Palo Alto Health Care System, Palo Alto, CA
Palo Alto, California, United States
Change in Balance
Balance was assessed during a 13-minute nocturnal light exposure (4 different conditions) and differences between the conditions were assessed. To determine goodness of balance while walking, the variability in stride length (i.e., variance in stride-to-stride length) was calculated in each of the conditions. Increased variability in stride length is associated with increased risk of falling.
Time frame: 13 minutes
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\~28 lux of orange light