Summary
Artificial light at night exposure worsened pain sensitivity to cold and mechanical stimuli and reduced hippocampal vascular density in mice, with sex-dependent differences in both outcomes. These findings suggest that nighttime light exposure in healthcare and residential settings may exacerbate pain conditions and compromise cerebrovascular health, highlighting the importance of light-dark cycle management.
Key Findings
- ALAN exposure heightened responsiveness to noxious cold stimuli and innocuous mechanical touch (allodynia/hyperalgesia), with effects varying by sex and disease state
- ALAN exposure reduced hippocampal vascular density in mice, with notable regional sex differences in vascular network connectivity and structure
- Approximately 80% of humans are exposed to ALAN beyond natural nighttime lighting levels, making circadian disruption a widespread public health concern
- VesselVio, an open-source vasculature analysis application, was developed and used to quantify ALAN-induced cerebrovascular changes
Categories
Sleep & Circadian Health: Investigates how artificial light at night (ALAN) disrupts circadian rhythms, affecting pain behavior and cerebrovascular structure in mice.
The Science of Light: Examines the biological mechanisms by which ALAN exposure alters neurophysiology, including hippocampal vascular density and network connectivity.
Patient Recovery: ALAN-induced changes in pain sensitivity and cerebrovascular structure have direct implications for hospital lighting environments and patient outcomes.
Author(s)
JR Bumgarner
Publication Year
2023
Related Publications
Sleep & Circadian Health
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The Science of Light
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- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice
Patient Recovery
- Light during darkness and cancer: relationships in circadian photoreception and tumor biology
- An overview of the effects of light on human circadian rhythms: Implications for new light sources and lighting systems design
- Application of different circadian lighting metrics in a health residence
- Melatonin and cortisol in individuals with spinal cord injury
- Sustainable lighting for healthcare facilities: More than just lumens per watt