Steele Catriona M, Van Lieshout Pascal H H M
Toronto Rehabilitation Institute, 550 University Avenue, #12030, Toronto, Ontario, M5G 2A2, Canada.
Dysphagia. 2008 Mar;23(1):33-46. doi: 10.1007/s00455-007-9093-4. Epub 2007 Aug 15.
Previous literature on tongue-jaw relationships during swallowing has focused on behaviors observed with chewable solid foods. The present investigation was undertaken to evaluate both the nature and stability of coordinative relationships between the jaw and three points located along the midsagittal groove of the tongue--anterior (blade), middle (body), and posterior (dorsum)--during swallowing of thin and honey-thick liquids. A reiterative swallowing paradigm was used, with two task conditions (discrete and sequential), to explore the stability of tongue-jaw coordination across different frequencies of swallowing. Eight healthy participants in two age groups (young, older) performed sets of repeated swallows. Tongue and jaw movements were measured using electromagnetic midsagittal articulography. The data were analyzed in terms of variability in the spatiotemporal movement pattern for each fleshpoint of interest, and the temporal coupling (frequency entrainment) and relative phasing of movement for each tongue segment compared to the mandible. The results illustrate a stereotypical but not invariant sequence of movement phasing in the tongue-jaw complex during liquid swallowing and task-related reductions in variability at higher frequencies of swallowing in tongue dorsum movements. This evidence supports the idea that different segments of the tongue couple with the jaw as a synergy for swallowing, but can modify their coupling relationship to accommodate task demands.
以往关于吞咽过程中舌颌关系的文献主要关注咀嚼固体食物时观察到的行为。本研究旨在评估在吞咽稀薄和蜂蜜浓稠液体时，下颌与沿舌中矢状沟定位的三个点（前部（舌尖）、中部（舌体）和后部（舌背））之间协调关系的性质和稳定性。采用重复吞咽范式，设置两种任务条件（离散和连续），以探究不同吞咽频率下舌颌协调的稳定性。两个年龄组（年轻组、老年组）的八名健康参与者进行了多次重复吞咽。使用电磁中矢状面关节造影术测量舌和下颌的运动。根据每个感兴趣的肌点的时空运动模式的变异性，以及每个舌段与下颌相比的运动时间耦合（频率夹带）和相对相位来分析数据。结果表明，在液体吞咽过程中，舌颌复合体的运动相位序列具有刻板性但并非一成不变，并且在较高吞咽频率下，舌背运动的变异性会因任务而降低。这一证据支持了这样一种观点，即舌的不同节段与下颌协同作用以进行吞咽，但可以改变它们之间的耦合关系以适应任务需求。
