Abstract
Purpose
To examine whether or not associations between sleep-disordered breathing (SDB) and impaired fasting glucose and type 2 diabetes are mediated by obesity.
Methods
We used cross-sectional data including participants from the Multi-Ethnic Study of Atherosclerosis (MESA). SDB, including obstructive sleep apnea (OSA), hypoxia and sleep fragmentation, was evaluated by polysomnography. Further, five obesity measures related to overall obesity and central obesity were assessed. Mediation analysis was conducted to explore the mediating effect of obesity on these relationships between SDB and impaired fasting glucose and type 2 diabetes.
Results
Among 1615 participants, OSA and hypoxia, including apnea hypopnea index (AHI) ≥ 15, percent of total sleep time (TST) with SaO2 < 90% (TST90), oxygen desaturation index (ODI), and lowest oxygen saturation (SaO2), were significantly associated with impaired fasting glucose and type 2 diabetes. In addition, mean SaO2 was also associated with impaired fasting glucose. Mediation analysis showed that these relationships were significantly mediated by all five obesity measures, where central obesity had greater mediating effect than overall obesity. Proportion of mediation of obesity ranged from 21.5 to 62.5% for impaired fasting glucose and 25.85 to 71.6% for type 2 diabetes, with substantial differences found in the subgroup analysis by gender or race/ethnicity. The consistency of the mediating effect was demonstrated across multiple measures of SDB, obesity, and glucose metabolism.
Conclusion
Obesity, especially central obesity, may play a critical role in the pathway where SDB, including OSA and hypoxia, increases the occurrence of impaired fasting glucose and type 2 diabetes. Weight management is important for patients with SDB to prevent type 2 diabetes.
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Data availability
The data that support the findings of this study are available from the National Heart, Lung, and Blood Institute (NHLBI) but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of NHLBI.
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Acknowledgements
This manuscript was prepared using MESA Research Material obtained from the National Heart, Lung, and Blood Institute (NHLBI). The authors appreciate the contributions of the investigators, staff, and participants of the MESA study and NHLBI.
Funding
This project was supported by the National Natural Science Foundation of China (Grant numbers: 82073674 and 81872715).
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Tong Wang designed the study, provided statistical advice, and contributed to the data management, manuscript reviewing, and editing. Shuting Chen designed the study and contributed to the data analysis and interpretation, figures creation, and drafting, reviewing, and editing of the manuscript. Jiale Wang contributed to the data analysis, reviewing, and editing of the manuscript. Juping Wang and Qian Gao contributed to the critically reviewing and editing of the manuscript. Xiaotian Zhao contributed to the figures creation and manuscript reviewing. Hongwei Guan contributed to the manuscript polishing and reviewing. All authors have read and approved the final manuscript.
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Chen, S., Wang, J., Wang, J. et al. Obesity as a mediator linking sleep-disordered breathing to both impaired fasting glucose and type 2 diabetes. Sleep Breath 27, 1067–1080 (2023). https://doi.org/10.1007/s11325-022-02705-z
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DOI: https://doi.org/10.1007/s11325-022-02705-z