Department of Oral Functional Science, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan.
Department of Oral Functional Science, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan.
Am J Orthod Dentofacial Orthop. 2018 Dec;154(6):797-802. doi: 10.1016/j.ajodo.2018.02.009.
The aims of this study were to determine the difference in electromyography (EMG) of the orbicularis oris muscles between subjects with lip incompetence and lip competence and to elucidate the effectiveness of hypoxic lip training with EMG.
Twenty-five subjects (14 men, 11 women; mean age, 24.5 ± 2.6 years) were divided into 2 groups by sealed lip ratio: 13 subjects with lip incompetence (LI) and 12 subjects with lip competence (LC). Integral values of EMG for the orbicularis oris muscle during lip closing were estimated (baseline, T1). Then the subjects in the LI group performed the hypoxic lip training every day for 4 weeks. The EMG recordings were repeated during the training (T2), immediately after the training (T3), 4 weeks after the training (T4), and 8 weeks after the training (T5).
In the LI group, the EMG values during lip closing were significantly higher than those of the LC group, and the values of EMG during lip closing at T3 were significantly lower than those at T1. In the posttraining period, the values of EMG at T4 and T5 were significantly lower than those at T1. The results suggested that subjects with lip incompetence need greater orbicularis oris muscle activity to keep their lips closed.
The suggested standardized lip training could be used as a training method for patients with lip incompetence.
本研究旨在确定唇闭合无力者和唇闭合有力者的口轮匝肌肌电图（EMG）的差异，并阐明 EMG 指导下的低氧口唇训练的效果。
25 名受试者（14 名男性，11 名女性；平均年龄 24.5±2.6 岁）按唇闭合比分为两组：唇闭合无力组（LI）13 名，唇闭合有力组（LC）12 名。口轮匝肌在唇闭合过程中的 EMG 积分值进行评估（基线，T1）。然后，LI 组受试者每天进行低氧口唇训练，持续 4 周。在训练期间（T2）、训练后即刻（T3）、训练后 4 周（T4）和训练后 8 周（T5）重复 EMG 记录。
LI 组在唇闭合过程中的 EMG 值明显高于 LC 组，T3 时的 EMG 值明显低于 T1。在训练后的时期，T4 和 T5 的 EMG 值明显低于 T1。结果表明，唇闭合无力者需要更大的口轮匝肌活动来保持嘴唇闭合。
建议的标准化口唇训练可作为唇闭合无力患者的训练方法。
