The association between sleep and cognitive function in people with spinal cord injury (SCI)

Area of Science:

• Neuroscience
• Sleep Science
• Rehabilitation Medicine

Background:

• Sleep disturbances are common in individuals with spinal cord injury (SCI).
• The impact of sleep problems on cognitive function is well-documented in other clinical populations.
• The relationship between sleep and cognition in SCI has not been previously investigated.

Purpose of the Study:

• To examine the association between sleep and cognitive function in individuals with SCI.
• To explore how subjective sleep ratings and autonomic nervous system (ANS) activity during sleep relate to cognitive performance in SCI.

Main Methods:

• 167 individuals with SCI participated in a 7-day study.
• Participants provided daily subjective sleep ratings and wore a wrist-worn device monitoring ANS activity (blood volume pulse [BVP] and electrodermal activity [EDA]).
• Cognitive function was assessed using subjective ratings and six objective tests.

Main Results:

• Subjective sleep quality, duration, and variability were not associated with cognitive performance.
• Lower BVP signal during sleep correlated with poorer performance in processing speed, working memory, and learning/long-term memory.
• EDA signals during sleep were associated with poorer executive function.

Conclusions:

• Sleep physiology, particularly ANS activity during sleep, may play a role in cognitive function for individuals with SCI.
• Further research is required to elucidate the specific mechanisms linking sleep and cognition in SCI.
• Findings may inform future interventions aimed at improving cognitive outcomes in SCI populations.