Properties of hyoid muscle contraction during tongue lift measurement
Properties of hyoid muscle contraction during tongue lift measurement
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DOI：
10.1111/joor.12894
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发表时间：
2019-12-04
影响因子：
2.9
通讯作者：
Inoue, Makoto
中科院分区：
文献类型：
--
作者：
Koshi, Naomi;Magara, Jin;Inoue, Makoto
背景舌提升运动（TLM）任务被认为是吞咽困难患者的一种治疗策略。然而，没有证据表明持续的舌头运动对相关肌肉收缩的影响。目的研究舌骨上肌在TLM中的肌电特性及其随时间的变化。方法20名健康青年志愿者，分别在舌前或舌后位以最大努力进行TLM，测量舌压7s。记录舌骨上（S-hyo）和舌骨下（I-hyo）肌电图。比较不同条件下的肌电图爆发面积和功率频率以及舌压曲线下面积：试验（第1、第2和第3次试验）;前与后TLM;每个试验的早与晚3s。结果舌压在试验间及3s前后无差异。前舌压力显著高于后舌压力（P <0.001）。与前TLM相比，后TLM期间I-hyo EMG爆发的面积显著更大（P = .044），I-hyo EMG爆发的功率频率显著更小（P = .042）。在前（P <0.05）和后（P <0.01）TLM的早期和晚期，两种EMG爆发的功率频率存在显著差异。结论舌骨肌在舌压产生过程中可能通过改变其活动模式来补偿舌肌的快速疲劳以维持舌压。
Background Tongue lift movement (TLM) task is considered a treatment strategy in dysphagic patients. However, there is no evidence of effect of sustained tongue movements on the related muscle contraction. Objectives The present study aimed to characterise the properties and time-dependent changes of the electromyographic (EMG) features of suprahyoid muscles during TLM. Methods Twenty young healthy volunteers were instructed to perform TLM at maximum effort in either the anterior or the posterior position, during measurement of tongue pressure for 7 s. Supra- (S-hyo) and infra-hyoid (I-hyo) EMGs were recorded. The area and power frequency of EMG burst and the area under the curve of tongue pressure were compared among the conditions: trials (1st, 2nd vs 3rd trials); anterior vs posterior TLM; and early vs late 3 s of each trial. Results There was no difference in the tongue pressure among trials or between the early and late 3 s. Anterior tongue pressure was significantly higher than posterior tongue pressure (P < .001). The area of I-hyo EMG burst was significantly larger (P = .044), and the power frequency of I-hyo EMG burst was significantly smaller (P = .042) during posterior TLM than anterior TLM. A significant difference in the power frequency of both EMG bursts was observed between early and late stages during both anterior (P < .05) and posterior (P < .01) TLM. Conclusion Hyoid muscles may compensate for rapid fatigue of the tongue muscle to maintain tongue pressure by changing their activity pattern during tongue pressure generation.