Relationship between stage II transport and number of chewing strokes as mastication progresses

Shuichiro Yamashita, Daisuke Sugita, Koichiro Matsuo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

As mastication progresses, little is known about the occurrence of the stage II transport (oro-pharyngeal bolus transport). This study aimed to investigate the relationship between stage II transport and bolus aggregation in the pharynx and the number of chewing strokes. Twenty-five clinical residents with natural dentitions were recruited. The subjects were asked to chew gummy jelly with their preferred rhythm and to swallow the bolus at their preferred timing. To investigate stage II transport and bolus aggregation in the pharynx, a transnasal endoscope was used. The number of chewing strokes was measured by electromyographic activity from the masseter muscle. The mean numbers of chewing strokes of pre-stage II transport and post-stage II transport were 29.8 and 8.1, respectively; the difference was significant (p. <. 0.01). The ratio of the number of chewing strokes of pre-stage II transport to that of post-stage II transport was 4.0 to 1.0.This study showed that stage II transport started at four-fifths of the way along the progress of mastication, and that stage II transport and bolus aggregation in the pharynx are related to the number of chewing strokes. •Stage II transport and bolus aggregation in the pharynx are investigated using a transnasal endoscope.•Gummy jelly is used as a test food.•The number of chewing strokes is measured by electromyographic activity.•Stage II transport and bolus aggregation in the pharynx are related to the number of chewing strokes.

Original languageEnglish
Pages (from-to)100-103
Number of pages4
JournalPhysiology and Behavior
Volume122
DOIs
Publication statusPublished - 02-10-2013

Fingerprint

Mastication
Stroke
Pharynx
Endoscopes
Masseter Muscle
Dentition
Deglutition
Food

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience

Cite this

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Relationship between stage II transport and number of chewing strokes as mastication progresses. / Yamashita, Shuichiro; Sugita, Daisuke; Matsuo, Koichiro.

In: Physiology and Behavior, Vol. 122, 02.10.2013, p. 100-103.

Research output: Contribution to journalArticle

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