Coordinative Organization of Lingual Propulsion during the Normal Adult Swallow |
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Authors: | Erin M Wilson PhD CF-SLP Jordan R Green PhD CCC-SLP |
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Institution: | (1) Waisman Center & Department of Communicative Disorders, University of Wisconsin-Madison, Madison, WI, USA;(2) Department of Special Education and Communication Disorders, University of Nebraska-Lincoln, Lincoln, NE, USA;(3) University of Wisconsin-Madison, Waisman Center 531 A, 1500 Highland Avenue, Madison, WI 53705-2280, USA |
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Abstract: | Lingual propulsion during swallowing is characterized by the sequential elevation of the anterior, middle, and dorsal regions
of the tongue. Although lingual discoordination underlies many swallowing disorders, the coordinative organization of lingual
propulsion during the typical and disordered swallow is poorly understood. The purpose of this investigation was to quantitatively
describe the coordinative organization of lingual propulsion during the normal adult swallow. Tongue movement data were obtained
from the X-Ray Microbeam Database at the University of Wisconsin. Movement of four pellets placed on specific tongue regions
were tracked in 36 healthy adult participants while they swallowed 10 cc of water across five discrete trials. The propulsive
action of the tongue during bolus transport was quantified using a cross-correlation analysis. Lingual transit time (LTT),
which was defined as the interval (lag time) between the movements of the anterior- and posterior-most tongue regions, was
determined to be approximately 168 ms. The average time interval (lag) between the movements of the posterior tongue regions
was significantly shorter than the intervals between more anterior tongue regions. The results also suggest that during bolus
transport movement patterns of the anterior tongue regions are distinct from those of the posterior tongue regions. Future
work is needed to determine if the absence of the observed coordinative organization of lingual propulsion is indicative of
oral stage dysphagia. |
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Keywords: | Tongue Swallowing Coordination Kinematics Dysphagia Deglutition Deglutition disorders |
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