Abstract
Study objectives
Current evidence in adults suggests that, independent of obesity, obstructive sleep apnea (OSA) can lead to autonomic dysfunction and impaired glucose metabolism, but these relationships are less clear in children. The purpose of this study was to investigate the associations among OSA, glucose metabolism, and daytime autonomic function in obese pediatric subjects.
Methods
Twenty-three obese boys participated in: overnight polysomnography; a frequently sampled intravenous glucose tolerance test; and recordings of spontaneous cardiorespiratory data in both the supine (baseline) and standing (sympathetic stimulus) postures.
Results
Baseline systolic blood pressure and reactivity of low-frequency heart rate variability to postural stress correlated with insulin resistance, increased fasting glucose, and reduced beta-cell function, but not OSA severity. Baroreflex sensitivity reactivity was reduced with sleep fragmentation, but only for subjects with low insulin sensitivity and/or low first-phase insulin response to glucose.
Conclusions
These findings suggest that vascular sympathetic activity impairment is more strongly affected by metabolic dysfunction than by OSA severity, while blunted vagal autonomic function associated with sleep fragmentation in OSA is enhanced when metabolic dysfunction is also present.
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Funding
This work was supported in part by NIH Grants HL105210, HL090451, EB001978, RR00047, and the USC Center for Transdisciplinary Research on Energetics and Cancer (TREC U54 CA 116848). F.M.S. Oliveira also thanks the Fulbright/CAPES program.
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Oliveira, F.M.S., Tran, W.H., Lesser, D.J. et al. Abnormalities in autonomic function in obese boys at-risk for insulin resistance and obstructive sleep apnea. Pediatr Res 85, 790–798 (2019). https://doi.org/10.1038/s41390-018-0226-2
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DOI: https://doi.org/10.1038/s41390-018-0226-2
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