Arima T, Svensson P, Arendt-Nielsen L
Orofacial Pain Laboratory, Aalborg University, Denmark.
J Orofac Pain. 1999 Spring;13(2):104-14.
Pain in some bruxers has been suggested to represent a state of postexercise muscle soreness. This study examined the effect of voluntary, controlled grinding movements on the development of pain and soreness in the masticatory system.
Twelve healthy men (21 to 42 years old) without signs or symptoms of temporomandibular disorders (TMD) participated. Nine trials of 5 minutes of repeated grinding from the intercuspal position to the right canine-canine position (0.5 Hz) were performed on the first day. During the lateral excursions, the electromyographic (EMG) activity of the right masseter muscle was kept above 50% of maximal voluntary occlusal force (MVOF) with the use of visual feedback. The subjects rated pain intensity, unpleasantness, and soreness on 100-mm visual analogue scales (VAS); other pain measures, including the McGill Pain Questionnaire, were also used. Before and after the exercise trials, the MVOF was determined, and pain detection thresholds (PDT) to pressure stimuli were measured at 9 different sites on the masseter muscles. The subjects returned to the laboratory the 3 following days, where VAS, PDT, and MVOF were measured.
Immediately following the last grinding trial, there was a significant increase in VAS and MPQ scores of pain intensity, unpleasantness, and soreness, as compared to baseline values (analysis of variance, P < 0.001). There was still a significant effect from grinding on the VAS score of muscle soreness on the following days, with a peak the first day after the exercise (Tukey test, P < 0.023). Pain was frequently (in 7 of 12 subjects) reported in or around the temporomandibular joint. There was a significant effect from grinding on PDT at both masseter muscles (analysis of variance, P < 0.043), with significantly lower PDT the first day after the grinding exercise (Tukey test, P < 0.046). There were no effects from grinding on MVOF.
These findings suggest that significant but low levels of postexercise muscle soreness can be elicited by standardized grinding movements in the masticatory system of healthy subjects.
有研究表明，一些磨牙症患者的疼痛表现为运动后肌肉酸痛状态。本研究探讨了自主控制的磨牙运动对咀嚼系统疼痛和酸痛发展的影响。
12名无颞下颌关节紊乱症（TMD）体征或症状的健康男性（21至42岁）参与研究。第一天进行9次试验，每次从牙尖交错位重复磨向右侧尖牙-尖牙位（0.5赫兹），持续5分钟。在侧方运动过程中，利用视觉反馈使右侧咬肌的肌电图（EMG）活动保持在最大自主咬合力（MVOF）的50%以上。受试者在100毫米视觉模拟量表（VAS）上对疼痛强度、不适感和酸痛程度进行评分；还使用了包括麦吉尔疼痛问卷在内的其他疼痛测量方法。在运动试验前后，测定MVOF，并在咬肌的9个不同部位测量对压力刺激的疼痛检测阈值（PDT）。受试者在接下来的3天返回实验室，测量VAS、PDT和MVOF。
与基线值相比，在最后一次磨牙试验后立即发现，VAS以及疼痛强度、不适感和酸痛程度的麦吉尔疼痛问卷（MPQ）评分显著增加（方差分析，P < 0.001）。在接下来的几天里，磨牙对肌肉酸痛的VAS评分仍有显著影响，运动后第一天达到峰值（Tukey检验，P < 0.023）。颞下颌关节内或其周围经常出现疼痛（12名受试者中有7名）。磨牙对双侧咬肌的PDT有显著影响（方差分析，P < 0.043），在磨牙运动后第一天PDT显著降低（Tukey检验，P < 0.046）。磨牙对MVOF没有影响。
这些研究结果表明，健康受试者咀嚼系统中的标准化磨牙运动可引发显著但程度较低的运动后肌肉酸痛。
