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- W2408889946 abstract "Upper airway muscle motoneurons, as assessed at the level of the motor unit, have a range of different discharge patterns, varying as to whether their activity is modulated in phase with the respiratory cycle, are predominantly inspiratory or expiratory, or are phasic as opposed to tonic. Two fundamental questions raised by this observation are: how are synaptic inputs from premotor neurons distributed over motoneurons to achieve these different discharge patterns; and how do different discharge patterns contribute to muscle function? We and others have studied the behavior of genioglossus (GG) and tensor palatini (TP) single motor units at transitions from wakefulness to sleep (sleep onset), from sleep to wakefulness (arousal from sleep), and during hypercapnia. Results indicate that decreases or increases in GG and TP muscle activity occur as a consequence of derecruitment or recruitment, respectively, of phasic and tonic inspiratory-modulated motoneurons, with only minor changes in rate coding. Further, sleep–wake state and chemical inputs to this “inspiratory system” appear to be mediated through the respiratory pattern generator. In contrast, phasic and tonic expiratory units and units with a purely tonic pattern, the “tonic system,” are largely unaffected by sleep–wake state, and are only weakly influenced by chemical stimuli and the respiratory cycle. We speculate that the “inspiratory system” produces gross changes in upper airway muscle activity in response to changes in respiratory drive, while the “tonic system” fine tunes airway configuration with activity in this system being determined by local mechanical conditions." @default.
- W2408889946 created "2016-06-24" @default.
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- W2408889946 date "2014-01-01" @default.
- W2408889946 modified "2023-10-03" @default.
- W2408889946 title "Discharge properties of upper airway motor units during wakefulness and sleep" @default.
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- W2408889946 doi "https://doi.org/10.1016/b978-0-444-63488-7.00004-5" @default.
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