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Recruitment (%) of deglutition and secondary peristaltic reflex responses upon midesophageal provocation during awake and sleep states and also at time 1 and time 2 maturational phases. At time 2, note the greater proportion (%) of secondary peristalsis in sleep state compared with awake state. Furthermore, during sleep, the proportion of secondary peristalsis at time 2 is also greater than that at time 1.
