Spectral analysis of EMG using intramuscular electrodes reveals non-linear fatigability characteristics in persons with chronic low back pain
Spectral analysis of EMG using intramuscular electrodes reveals non-linear fatigability characteristics in persons with chronic low back pain
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DOI：
10.1016/j.jelekin.2012.07.001
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发表时间：
2013-02-01
影响因子：
2.5
通讯作者：
Kulig, Kornelia
中科院分区：
文献类型：
--
作者：
Beneck, George J.;Baker, Lucinda L.;Kulig, Kornelia
据报道，慢性腰痛 (LBP) 患者腰椎伸肌易疲劳，但伸肌萎缩往往发生在疼痛部位。因此，在两个仔细匹配的队列中，在等距水平躯干保持期间进行了特定的超声引导的局部和远程肌内肌电图记录；患有和不患有腰痛的人。测试以自行确定的最大保持时间进行，对照组保持水平位置的时间更长（P < 0.001）。由于保持时间的组间差异，进行功率谱分析以计算疲劳测试的前 30 秒和最后 30 秒的归一化中频 (NMF) 斜率。在测试的前 30 秒，NMF 斜率没有显着的组间差异 (P = 0.650)。健康受试者中前 30 秒和后 30 秒的 NMF 斜率没有差异 (P = 0.688)，但 LBP 患者中的 NMF 斜率有所不同，如测试最后 30 秒斜率变浅所示 (P = 0.008)。 LBP 组的肌肉比较显示，与 T10 胸最长肌（非疼痛区域）相比，深部多裂肌（疼痛区域）具有更大的非线性行为（P = 0.013）。讨论了这些发现的可能解释。 (C) 2012 Elsevier Ltd. 保留所有权利。
Greater fatigability across lumbar extensors has been reported in persons with chronic low back pain (LBP), however, extensor atrophy tends to be local to the site of pain. Therefore, specific ultrasound guided local and remote intramuscular electromyographic recordings were undertaken during an isometric horizontal trunk hold in two carefully matched cohorts; persons with and without LBP. The test was performed to self-determined maximal hold time, and the control group held the horizontal position longer (P < 0.001). A power spectral analysis was performed to calculate the normalized median frequency (NMF) slope for both the first and last 30 s of the fatigue test due to the group difference in hold times. There were no significant group differences in NMF slope at the first 30 s of testing (P = 0.650). The NMF slope for the first and last 30 s was not different in healthy subjects (P = 0.688), but was different in persons with LBP, illustrated by shallowing of the slope at the last 30 s of the test (P = 0.008). A between muscle comparison in the LBP group showed greater non-linear behavior in the deep multifidus (painful region) in contrast to T10 longissimus thoracis (nonpainful region) (P = 0.013). Possible explanations for these findings are discussed. (C) 2012 Elsevier Ltd. All rights reserved.