Division of Oral and Facial Disorders, Osaka University Dental Hospital, Osaka, Japan.
J Oral Rehabil. 2013 Sep;40(9):657-63. doi: 10.1111/joor.12071. Epub 2013 May 22.
This study examined the aspect of the regulation of velum movement in the transition from the oral to pharyngeal phases of swallowing in relation to changes in the swallowing volume and viscosity by means of measurment of levator veli palatini muscle activity. The subjects were nine normal adults, ranging in age from 24 to 30 years. The swallowing volume was set at 1/4, 1/2 and 1 volume of the optimum volume of green tea for swallowing determined in each subject, and the viscosity was adjusted to 0, 2·0 and 4·6 Pa·s by mixing with thickener. Nine test foods were prepared in total. The electromyographic activity of the levator veli palatini muscle was monitored using bipolar hooked wire electrodes. The levator veli palatini muscle activity was defined as the integrated electromyographic wave. The mean in swallowing each test food was determined in each subject. The levator veli palatini muscle activity increased with the swallowing volume for all subjects (P < 0·05) and decreased inversely with the viscosity for six subjects (P < 0·05), but no change with the increase in the viscosity was noted for three subjects. This study clarified the aspect of the regulation of velar movement with regard to the involvement of the levator veli palatini muscle in swallowing activity with changes in the swallowing volume and viscosity.
本研究通过测量腭帆提肌的肌电活动，研究了在吞咽从口腔期向咽期过渡时软腭运动的调节与吞咽量和粘度变化的关系。研究对象为 9 名年龄在 24 至 30 岁之间的正常成年人。吞咽量设定为每个受试者确定的最佳绿茶吞咽量的 1/4、1/2 和 1 倍，通过与增稠剂混合将粘度调整为 0、2.0 和 4.6 Pa·s。总共准备了 9 种测试食品。使用双极钩状线电极监测腭帆提肌的肌电活动。腭帆提肌活动定义为整合肌电波。在每个受试者中确定了吞咽每种测试食品的平均值。对于所有受试者，腭帆提肌活动随吞咽量增加而增加（P < 0.05），对于 6 名受试者，腭帆提肌活动随粘度降低而降低（P < 0.05），但对于 3 名受试者，随着粘度的增加，没有观察到变化。本研究阐明了在吞咽量和粘度变化时，腭帆提肌在吞咽活动中对软腭运动调节的方面。
