Journal of oral rehabilitation · 2025
Influence of Liquid Viscosity on Swallowing Dynamics in Healthy Adults: A Study Using a New Noninvasive Laryngeal Motion Evaluation Instrument.
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Nakao Yuta, Haji Tomoyuki
Аннотация
BACKGROUND: A noninvasive laryngeal motion evaluation device using photoelectric distance sensors (Nodomiru) has been newly developed and reported to be useful in evaluating swallowing dynamics. This device can easily obtain a laryngeal movement velocity curve and a laryngeal movement position curve. In this study, we aimed to examine how liquid viscosity affects the swallowing dynamics after verifying the usefulness of data smoothing in this measurement.
METHODS: This study included 33 healthy adults (mean age: 28.8 ± 9.7 years). They were instructed to swallow saliva and 3 mL of thin and medium-thickened liquids three times each in a sitting position. Laryngeal movements during these trials were evaluated using Nodomiru. The comma-separated value data output, which included laryngeal position and time information obtained from Nodomiru, were used to calculate the following parameters: laryngeal elevation time, elevation distance, velocity and laryngeal elevation persistence time with and without smoothing.
RESULTS: The intraclass correlation coefficient values of elevation peak velocity for the three swallowing trials of liquids were higher with smoothing (0.77) than without smoothing (0.54). Elevation peak velocities were 128.9 ± 56.8, 149.8 ± 47.2, and 173.5 ± 62.7 mm/s for saliva, thin liquid (water), and moderately thick liquid, respectively, demonstrating significant differences.
CONCLUSIONS: Using a smoothing procedure is beneficial for analysing the swallowing dynamics with Nodomiru. Furthermore, increasing liquid thickness promoted increased laryngeal movement velocity in healthy adults.
METHODS: This study included 33 healthy adults (mean age: 28.8 ± 9.7 years). They were instructed to swallow saliva and 3 mL of thin and medium-thickened liquids three times each in a sitting position. Laryngeal movements during these trials were evaluated using Nodomiru. The comma-separated value data output, which included laryngeal position and time information obtained from Nodomiru, were used to calculate the following parameters: laryngeal elevation time, elevation distance, velocity and laryngeal elevation persistence time with and without smoothing.
RESULTS: The intraclass correlation coefficient values of elevation peak velocity for the three swallowing trials of liquids were higher with smoothing (0.77) than without smoothing (0.54). Elevation peak velocities were 128.9 ± 56.8, 149.8 ± 47.2, and 173.5 ± 62.7 mm/s for saliva, thin liquid (water), and moderately thick liquid, respectively, demonstrating significant differences.
CONCLUSIONS: Using a smoothing procedure is beneficial for analysing the swallowing dynamics with Nodomiru. Furthermore, increasing liquid thickness promoted increased laryngeal movement velocity in healthy adults.