Duration of apnea on mastication and swallowing

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To clarify the respiratory kinetics associated with swallowing, we measured and analyzed the respiratory flow rates of eight healthy adult males during masticatory swallowing, including the points at which respiratory arrest and resumption occurred. We measured nasal respiratory kinetics using a differential pressure pneumotachograph. Laryngeal movement was determined using an acceleration pickup. We tested subjects during free masticatory swallowing of 12g and 24g portions of cooked rice. Subjects were seated in a vertical position. Waveforms of respiratory kinetics and of laryngeal movement were simultaneously recorded on a data recorder and analyzed. The food volume was not directly proportional to the number of swallows. The mean duration of apnea during swallowing in subjects eating 24g of rice was longer than in those eating 12g, although this difference was not significant. There was no significant difference in the duration of apnea between interposed swallows and terminal swallows. The respiratory pattern during masticatory swallowing was expiration-swallowing-expiration in 81.2% of the subjects. The results of this experiment suggest that swallowing volume does not influence the duration of apnea during masticatory swallowing.