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Relevance Between Reduction of SpO2 and Parasympathetic Nervous Activity During Sleep
Kentaro Taniguchi1,2, Akitoshi Seiyama3, Akito Shimouchi4
1Department of Bioscience, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan. ktaniguchi@kochi-gu.ac.jp.
Advances in Experimental Medicine and Biology
|October 14, 2024
Summary
Sleep apnea syndrome (SAS) is linked to reduced parasympathetic nervous system activity (PSNA). Lower SpO2 during sleep, indicated by a high oxygen desaturation index (ODI), correlates with decreased PSNA in young adults.
Area of Science:
- Cardiopulmonary and sleep medicine
- Autonomic nervous system function
Background:
- Sleep apnea syndrome (SAS) is associated with various health issues.
- Blood oxygen saturation (SpO2) monitoring via pulse oximetry is key for SAS screening.
- The oxygen desaturation index (ODI) quantifies SAS severity based on SpO2 drops.
Purpose of the Study:
- To investigate the relationship between reduced SpO2 and parasympathetic nervous system activity (PSNA) during sleep in young adults.
- To explore how SpO2 desaturation events impact autonomic function overnight.
Main Methods:
- Simultaneous monitoring of SpO2 using pulse oximetry and PSNA via accelerometer-based measurements over 24 hours in 63 young adults (20-32 years).
- Analysis of PSNA changes in relation to SpO2 fluctuations and calculation of the ODI.
Main Results:
- Participants exhibited significantly lower PSNA during SpO2 decreases (≥3%) compared to periods with normal SpO2.
- No significant PSNA difference was found at an ODI cutoff of 5 events/h.
- However, individuals with ODI >5 events/h showed significantly lower PSNA during normal SpO2 compared to those with ODI <5 events/h.
Conclusions:
- A high ODI may indicate reduced PSNA during sleep, potentially impacting sleep quality in young adults.
- Findings suggest an association between SpO2 desaturation and PSNA decline during sleep.
- Interventions targeting ODI reduction could improve sleep quality by supporting autonomic function.
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