Evaluation of the Sites Where Swallowing Sound Produces and the Acoustic Characteristic of Swallowing Sound in Healthy Adults

DOI 1 Citations 23 References
  • NAKAYAMA Hiroshi
    Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry
  • TAKAHASHI Koji
    Department of Oral Rehabilitation, Showa University School of Dentistry
  • UYAMA Risa
    Department of Oral Rehabilitation, Showa University School of Dentistry
  • HIRANO Kaoru
    Department of Oral Rehabilitation, Showa University School of Dentistry
  • FUKASAWA Miki
    Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry
  • NAGUMO Masao
    Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry

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Other Title
  • 嚥下音の産生部位と音響特性の検討
  • 健常成人を対象として

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Site where the swallowing sound is produced and acoustic characteristics of the swallowing sound in each site are unknown, although the swallowing sound is an important clue to diagnose acoustically dysphagia. Synchronized analyses of swallowing sound signals and VF images of swallowing events were done using new sound-image analyzing system to verify sites where the swallowing sounds are produced and acoustic characteristics of the swallowing sound in each site. Twelve healthy volunteers served as subjects. Ninety six swallows (8 swallows per each subject) were analyzed to measure bolus passing time, to identify bolus passing sound, to confirm the frequency of appeared passing sound, and to assess the maximum peak frequency.<BR>Epiglottis passing time (121.7±92.4 msec) was the shortest, tongue base passing time (184.8±70.6 msec) was second, and upper esophageal sphincter (UES) passing time (342.9±61.1 msec) was the longest. Tongue base passing sound, epiglottis passing sound, initial UES passing sound, middle UES passing sound and final UES passing sound were identified. Frequency of epiglottis passing sound was the highest (94/96). Patterns of the appearance of passing sounds in each swallow were investigated. The appearance of four passing sounds (base of tongue passing sound, epiglottis passing sound, initial UES passing sound, and middle UES passing sound) in a swallow was the most dominant (22/96).<BR>In assessing the averaged maximum peak frequency, initial UES passing sound (370.7±222.2 Hz) was the highest, middle UES passing sound (349.1±205.4 Hz) was second, tongue base passing sound (341.2±191.3 Hz) was third, v epiglottis passing sound (258.6 ± 208.2 Hz) forth, final UES passing sound (231.2±149.8 Hz) was fifth respectively. This study revealed site where the swallowing sound is produced and acoustic characteristics of the swallowing sound in each site.

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