Cioffi Iacopo, Sobhani Mona, Tenenbaum Howard C, Howard Alicia, Freeman Bruce V, Thaut Michael
J Oral Facial Pain Headache. 2018 Spring;32(2):167–177. doi: 10.11607/ofph.1960. Epub 2018 Feb 28.
To evaluate the effects of Guided Music Listening (GML) on masticatory muscles and on the amplitude of wake-time tooth clenching in individuals with higher vs lower frequency of clenching episodes.
The electromyographic (EMG) activity of the right masseter was recorded during three 20-minute music (relaxing, stress/tension, and favorite) tasks and a control no-music task in 10 (mean age ± standard deviation [SD] = 21.4 ± 3.0 years) and 11 (22.6 ± 2.9 years) healthy volunteers with higher (HP) vs lower (LP) frequency of tooth-clenching episodes, respectively. EMG episodes greater than 10% of the maximum voluntary contraction (EMG activity of the masseter during tooth clenching) and below 10% (EMG activity during rest) were analyzed. Nonparametric tests were used to assess between-group and within-group (between-task) differences in primary outcome measures.
In both groups, EMG activity during rest was the greatest during the stress/tension task, and it was the lowest during the favorite task in the LP group and the relaxing task in the HP group (all P < .001). In the HP group, the amplitude of clenching episodes was significantly lower during the favorite and stress/tension tasks than during the relaxing task (all P < .05), while in the LP group, it was significantly lower during the stress/tension task than during the control task (P = .001). The experiment did not affect the frequency or duration of clenching episodes.
GML modulates masticatory muscle activity. The response to GML depends on the frequency of clenching and the type of music.
评估引导式音乐聆听（GML）对咬肌以及对紧咬发作频率较高和较低的个体清醒时牙齿紧咬幅度的影响。
分别在10名（平均年龄±标准差[SD]=21.4±3.0岁）和11名（22.6±2.9岁）牙齿紧咬发作频率较高（HP）和较低（LP）的健康志愿者中，在三项20分钟的音乐（放松、压力/紧张和喜爱的音乐）任务以及一项无音乐对照任务期间，记录右侧咬肌的肌电图（EMG）活动。分析大于最大自主收缩10%（紧咬牙齿时咬肌的EMG活动）和低于10%（休息时的EMG活动）的EMG发作。使用非参数检验评估主要结局指标的组间和组内（任务间）差异。
在两组中，休息时的EMG活动在压力/紧张任务期间最大，在LP组的喜爱音乐任务期间以及HP组的放松任务期间最低（所有P<.001）。在HP组中，喜爱音乐和压力/紧张任务期间紧咬发作的幅度显著低于放松任务期间（所有P<.05），而在LP组中，压力/紧张任务期间的紧咬幅度显著低于对照任务期间（P=.001）。该实验未影响紧咬发作的频率或持续时间。
GML可调节咬肌活动。对GML的反应取决于紧咬频率和音乐类型。
