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Chewing and Food Consistency: Effects on Bolus Transport and Swallow Initiation

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Abstract

Preswallow bolus formation usually occurs in the mouth for liquids and in the oropharynx for solid foods. We examined the effect of chewing on the relationship between bolus transport and swallow initiation. Fifteen healthy subjects were imaged with lateral projection videofluorography while eating liquids, solid foods, and a mixture of liquid and solid foods in upright and facedown postures. Videotapes were reviewed to measure the location of the leading edge of the barium at swallow initiation. Chewing and initial consistency each altered the relationship between food transport and swallow initiation. In particular, when chewing liquid (or consuming foods with both liquid and solid phases), a portion of the food commonly reached the hypopharynx well before swallow onset. This transport to the hypopharynx was highly dependent on gravity, but transport to the valleculae for chewed solid food was active, depending primarily on tongue-palate contact. Chewing appeared to reduce the effectiveness of the posterior tongue-palate seal, allowing oral contents to spill into the pharynx. Consuming two-phase foods with both solid and liquid phases may increase the risk of aspiration in dysphagic individuals with impaired airway protective reflexes.

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References

  1. Dantas RO, Dodds WJ, Massey BT, Shaker R, Cook IJ: Manometric characteristics of glossopalatal sphincter. Dig Dis Sci 35:161–166, 1990

    Article  PubMed  CAS  Google Scholar 

  2. Bosma JF: Deglutition: pharyngeal stage. Physiol Rev 37:275–300, 1957

    Google Scholar 

  3. Dodds WJ, Stewart ET, Logemann JA: Physiology and radiology of the normal oral and pharyngeal phases of swallowing [see comments]. AJR Am J Roentgenol 154:953–963, 1990

    PubMed  CAS  Google Scholar 

  4. Palmer JB, Rudin NJ, Lara G, Crompton AW: Coordination of mastication and swallowing. Dysphagia 7:187–200, 1992

    Article  PubMed  CAS  Google Scholar 

  5. Hiiemae KM, Palmer JB: Food transport and bolus formation during complete feeding sequences on foods of different initial consistency [see comments]. Dysphagia 14:31–42, 1999

    Article  PubMed  CAS  Google Scholar 

  6. Linden P, Tippett D, Johnston J, Siebens A, French J: Bolus position at swallow onset in normal adults: preliminary observations. Dysphagia 4:146–150, 1989

    Article  PubMed  CAS  Google Scholar 

  7. Robbins J, Hamilton JW, Lof GL, Kempster GB: Oropharyngeal swallowing in normal adults of different ages. Gastroenterology 103:823–829, 1992

    PubMed  CAS  Google Scholar 

  8. Palmer JB: Bolus aggregation in the oropharynx does not depend on gravity. Arch Phys Med Rehabil 79:691–696, 1998

    Article  PubMed  CAS  Google Scholar 

  9. Dua KS, Ren J, Bardan E, Xie P, Shaker R: Coordination of deglutitive glottal function and pharyngeal bolus transit during normal eating. Gastroenterology 112:73–83, 1997

    Article  PubMed  CAS  Google Scholar 

  10. Lamkadem M, Zoungrana OR, Amri M, Car A, Roman C: Stimulation of the chewing area of the cerebral cortex induces inhibitory effects upon swallowing in sheep. Brain Res 832:97–111, 1999

    Article  PubMed  CAS  Google Scholar 

  11. Zoungrana OR, Lamkadem M, Amri M, Car A, Roman C: Effects of lingual nerve afferents on swallowing in sheep. Exp Brain Res 132:500–509, 2000

    Article  PubMed  CAS  Google Scholar 

  12. Palmer JB, Hiiemae KM, Liu J: Tongue-jaw linkages in human feeding: a preliminary videofluorographic study. Arch Oral Biol 42:429–441, 1997

    Article  PubMed  CAS  Google Scholar 

  13. Prinz JF, Lucas PW: An optimization model for mastication and swallowing in mammals. Proc R Soc Lond B Biol Sci 264:1715–1721, 1997

    Article  CAS  Google Scholar 

  14. Logemann JA: Evaluation and treatment of swallowing disorders. Austin, TX: Pro-Ed, 1998

    Google Scholar 

Download references

Acknowledgments

This study was supported in part by a Health Sciences Research Grant, Comprehensive Research on Aging and Health (H-11-Choju-035) from the Ministry of Health, Labour and Welfare, Japan (to ES) and by USPHS Award R0l DC02123 from the National Institute on Deafness and Other Communication Disorders (to JBP).

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Correspondence to Eiichi Saitoh MD, DMSc.

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Saitoh, E., Shibata, S., Matsuo, K. et al. Chewing and Food Consistency: Effects on Bolus Transport and Swallow Initiation. Dysphagia 22, 100–107 (2007). https://doi.org/10.1007/s00455-006-9060-5

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  • DOI: https://doi.org/10.1007/s00455-006-9060-5

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