Sleep Med Psychophysiol.  2017 Jun;24(1):32-37. 10.14401/KASMED.2017.24.1.32.

Correlational Analysis of Supine Position Time and Sleep-related Variables in Obstructive Sleep Apnea Syndrome

• Kim SY
• Park DH
• Yu J
• Ryu SH
• Ha JH

• KMID: 2387301
• DOI: http://doi.org/10.14401/KASMED.2017.24.1.32

Abstract

OBJECTIVES
A supine sleep position increases sleep apneas compared to non-supine positions in obstructive sleep apnea syndrome (OSAS). However, supine position time (SPT) is not highly associated with apnea-hypopnea index (AHI) in OSAS. We evaluated the correlation among sleep-related variables and SPT in OSAS.
METHODS
A total of 365 men with OSAS were enrolled in this study. We analyzed how SPT was correlated with demographic data, sleep structure-related variables, OSAS-related variables and heart rate variability (HRV). Multiple linear regression analysis was conducted to investigate the factors that affected SPT.
RESULTS
SPT had the most significant correlation with total sleep time (TST ; r = 0.443, p < 0.001), followed by sleep efficiency (SE ; r = 0.300, p < 0.001). Snoring time (r = 0.238, p < 0.001), time at < 90% SpO2 (r = 0.188, p < 0.001), apnea-hypopnea index (AHI ; r = 0.180, p = 0.001) and oxygen desaturation index (ODI ; r = 0.149, p = 0.004) were significantly correlated with SPT. Multiple regression analysis revealed that TST (t = 7.781, p < 0.001), snoring time (t = 3.794, p < 0.001), AHI (t = 3.768, p < 0.001) and NN50 count (t = 1.993, p = 0.047) were associated with SPT.
CONCLUSION
SPT was more highly associated with sleep structure-related parameters than OSAS-related variables. SPT was correlated with TST, SE, AHI, snoring time and NN50 count. This suggests that SPT is likely to be determined by sleep structure, HRV and the severity of OSAS.

Keyword

Heart rate variability; Obstructive sleep apnea syndrome; Sleep structure; Supine position time

MeSH Terms

Heart Rate
Humans
Linear Models
Male
Oxygen
Sleep Apnea Syndromes
Sleep Apnea, Obstructive*
Snoring
Supine Position*
Oxygen