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Skin blood flow responses during sleep by laser Doppler flowmetry
Y Shiihara1, A Hirota, Y Kobayashi
1School of Health Sciences, Gunma University School of Medicine, Japan.
Psychiatry and Clinical Neurosciences
|August 25, 1999
Summary
Skin blood flow responses (SBFR) during sleep were measured. SBFR decreased with deeper non-rapid eye movement sleep, suggesting it reflects autonomic function during sleep.
Area of Science:
- Physiology
- Sleep Science
- Autonomic Nervous System Research
Background:
- Skin blood flow regulation is complex, influenced by autonomic nervous system activity.
- Skin blood flow responses (SBFR) are transient reductions in blood flow.
- Autonomic function during sleep is challenging to assess non-invasively.
Purpose of the Study:
- To investigate the relationship between skin blood flow responses (SBFR) and sleep stages.
- To evaluate SBFR as a potential indicator of autonomic function during sleep.
Main Methods:
- Laser Doppler flowmetry was used to measure fingertip skin surface blood flow in a 21-year-old woman during sleep.
- Skin potential responses (SPR) were recorded concurrently.
- The frequency and timing of SBFR in relation to SPR and sleep stages were analyzed.
Main Results:
- SBFR, characterized by a 25s reduction in skin blood flow, showed an 8-9s delay from the onset of SPR.
- SBFR occurred more consistently than SPR.
- The frequency of SBFR decreased during non-rapid eye movement (NREM) sleep, with a notable reduction in deeper sleep stages.
Conclusions:
- SBFR demonstrates a clear association with sleep depth and autonomic activity.
- SBFR is a valid and discrete index for assessing autonomic function during sleep.
- Further research can explore SBFR in diverse populations and sleep conditions.