CHARACTERISTICS OF MUSCLE FATIGUE IN PATIENTS WITH MYOFASCIAL PAIN-DYSFUNCTION SYNDROME
CHARACTERISTICS OF MUSCLE FATIGUE IN PATIENTS WITH MYOFASCIAL PAIN-DYSFUNCTION SYNDROME
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DOI：
10.1016/0003-9969(94)90016-7
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发表时间：
1994-10-01
影响因子：
3
通讯作者：
MAJOURAU, A
中科院分区：
文献类型：
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作者：
GAY, T;MATON, B;MAJOURAU, A
本研究旨在比较正常人和肌筋膜疼痛功能障碍综合征（MPD）患者咬肌和颞肌的肌肉疲劳特性。MPD肌肉被认为具有与其健康对应物不同的疲劳特征;这些特征可以使用标准肌电图（EMG）信号处理技术来量化。共18名被诊断为患有MPD的患者组成实验组，15名无颞下颌关节疼痛和功能障碍病史或症状的成年人作为对照组。表面肌电图记录咬肌和颞肌前肌，而受试者举行的切牙咬合力水平为10 N尽可能长的时间。将EMG数据传输到微型计算机中，在微型计算机中以10 s的间隔计算2 s样本的信号的功率密度谱。平均功率频率（MPF）和功率（均方根，r.m.s.）的信号从功率密度谱计算。结果显示：（1）MPD患者的耐力时间明显缩短;（2）17名MPD患者中有3名患者的咬肌不活动;（3）MPD患者的MPF随时间的下降明显大于正常受试者;（4）MPD患者的r.m.s.随着时间的推移，MPD患者的功率显著更大;（5）两组的功率密度谱的带宽相似。这些结果的含义是MPD肌肉并不像目前认为的那样处于持续疲劳状态，而是表现出加速疲劳。
The purpose of this study was to compare the properties of muscle fatigue in the masseter and temporalis muscles of normal individuals and those with myofascial pain-dysfunction syndrome (MPD). The MPD muscle is presumed to have different characteristics of fatigue than its healthy counterpart; these characteristics can be quantitated using standard electromyogram (EMG) signal-processing techniques. A total of 18 patients diagnosed as having MPD comprised the experimental group and 15 adults with no history or present symptoms of temporomandibular joint pain and dysfunction served as controls. Surface EMG recordings were made for both the masseter and anterior temporalis muscles while the subject held an incisal bite force level of 10N for as long as possible. The EMG data were transferred to a microcomputer where the power-density spectrum of the signals were calculated for 2-s samples at 10-s intervals. The mean power frequency (MPF) and power (root mean square, r.m.s.) of the signals were calculated from the power-density spectra. Results showed: (1) the endurance times were significantly shorter for the MPD patients; (2) the masseter was not active in three of 17 MPD patients; (3) decreases in MPF over time were significantly greater for the MPD patients than normal subjects; (4) increases in r.m.s. power were significantly greater over time for the MPD patients; (5) bandwidths of the power-density spectra were similar for the two groups. The implication of these results is the MPD muscle is not in a state of constant fatigue, as is currently believed, but rather demonstrates accelerated fatigue.