Journal
DYSPHAGIA
Volume 36, Issue 5, Pages 936-943Publisher
SPRINGER
DOI: 10.1007/s00455-020-10217-9
Keywords
Tongue-hold swallow; Superior pharyngeal constrictor; High-resolution manometry; Deglutition; Deglutition disorder
Categories
Funding
- Japanese Ministry of Education, Science, Culture, Sports, Science, and Technology [16K01477, 19K11429]
- Grants-in-Aid for Scientific Research [16K01477, 19K11429] Funding Source: KAKEN
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The study found that performing tongue-hold swallow (THS) can enhance pharyngeal contractile vigor, prolong some contraction duration, and result in significant biomechanical changes in pharyngeal swallowing muscles.
Tongue-hold swallow (THS) is a swallow exercise in which an individual swallows saliva while holding the anterior portion of the tongue between the front teeth. The effect of THS on pharyngeal contractile vigor is still unclear. The purpose of this study was to quantify THS using high-resolution manometry with a contractile integral analysis. Twenty-two healthy participants performed three different saliva swallow tasks: normal swallow, weak THS (in which the tongue was protruded 1 cm outside the upper incisors), and strong THS (in which the tongue was protruded 2 cm outside the upper incisors). The participants repeated each task twice randomly. Pharyngeal and upper esophageal sphincter metrics, including the pharyngeal contractile integral, were analyzed. Both weak and strong THS enhanced the velopharyngeal contractile integral and peak pressure compared with normal swallow (P < 0.01). THS also prolonged mesopharyngeal contraction (P < 0.01). Holding the tongue anteriorly during swallow requires significant biomechanical changes to pharyngeal contractile properties at the superior and middle pharyngeal constrictor levels; thus, it may serve as a resistance exercise for the muscles that are involved in bolus propulsion.
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