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|Title:||Mechanisms of the deep, slow-wave, sleep-related increase of upper airway muscle tone in healthy humans|
|Citation:||Journal of Applied Physiology, 2017; 122(5):1304-1312|
|Publisher:||American Physiological Society|
|Amelia Hicks, Jennifer M. Cori, Amy S. Jordan, Christian L. Nicholas, Leszek Kubin, John G. Semmler, Atul Malhotra, David G. P. McSharry, and John A. Trinder|
|Abstract:||Upper airway muscle activity is reportedly elevated during slow-wave sleep (SWS) when compared with lighter sleep stages. To uncover the possible mechanisms underlying this elevation, we explored the correlation between different indices of central and reflex inspiratory drive, such as the changes in airway pressure and end-expiratory CO2 and the changes in the genioglossus (GG) and tensor palatini (TP) muscle activity accompanying transitions from the lighter N2 to the deeper N3 stage of non-rapid eye movement (NREM) sleep in healthy young adult men. Forty-six GG and 38 TP continuous electromyographic recordings were obtained from 16 men [age: 20 ± 2.5 (SD) yr; body mass index: 22.5 ± 1.8 kg/m2] during 32 transitions from NREM stages N2 to N3. GG but not TP activity increased following transition into N3 sleep, and the increase was positively correlated with more negative airway pressure, increased end-tidal CO2, increased peak inspiratory flow, and increased minute ventilation. None of these correlations was statistically significant for TP. Complementary GG and TP single motor unit analysis revealed a mild recruitment of GG units and derecruitment of TP units during the N2 to N3 transitions. These findings suggest that, in healthy individuals, the increased GG activity during SWS is driven primarily by reflex stimulation of airway mechanoreceptors and central chemoreceptors.NEW & NOTEWORTHY The characteristic increase in the activity of the upper airway dilator muscle genioglossus during slow-wave sleep (SWS) in young healthy individuals was found to be related to increased stimulation of airway mechanoreceptors and central chemoreceptors. No evidence was found for the presence of a central SWS-specific drive stimulating genioglossus activity in young healthy individuals. However, it remains to be determined whether a central drive exists in obstructive sleep apnea patients.|
|Keywords:||slow-wave sleep; upper airway muscles; genioglossus; tensor palatini; non-rapid eye movement sleep|
|Description:||First published March 2, 2017|
|Rights:||Copyright © 2017 the American Physiological Society|
|Appears in Collections:||Physiology publications|
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