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An Electromyography Study of Acute Low Back Pain

机译：急性下腰痛的肌电图研究

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This paper presents the results of a laboratory investigation to determine the effect of acute low back pain on electromyography amplitude and frequency parameters. Ten (10) subjects, 5 normal and 5 acute low back pain patients,participated in the study. The test protocol involved (a) determination of maximum voluntary contraction (MVC) (b) after a short rest period of 2 minutes, subjects were asked to perform randomised back muscle contractions at 20,40,60 and 80 percent of MVC values for 30 seconds. EMG was recorded from 6 lumbar muscle sites (L1, L2 and L5, both Right and Left). EMG signals were processed and analysed for RMS and median frequency (MF). Two sets of parameters: (a) contralateral ratios (right/left) of RMS and MF values (b) ipsilateral ratios of RMS and MF values for sites L1,L2 and L5 were determined. The results of the study showed that there were differences in EMG signal characteristics between acute LBP (ALBP) and normal subjects. With respect to contralateral ratio parameters, it was found that the average RMS values were higher at L1 for ALBP patients as compared to pain-free subjects. At muscle site L5, the average RMS (rL5/lL5) values,where 'r' and ' 1' represent right and left sides, did not show much difference. Median frequency (right/left) at L1 was found to be lower for ALBP patients compared to pain free subjects. The results of ipsilateral ratio parameters were found to be more consistent than contralateral ratios. In general, ALBP subjects had higher MF ratio values for both right and left sides. The results also showed that the ipsilateral RMS ratio values were higher in ALBP subjects than in normal subjects.
机译：本文介绍了实验室研究的结果，以确定急性下腰痛对肌电图振幅和频率参数的影响。十（10）名受试者，5名正常人和5名急性下腰痛患者参加了研究。测试方案涉及（a）在短时间休息2分钟后确定最大自愿收缩（MVC）（b），要求受试者以30、20、40、60和80％的MVC值进行随机的背部肌肉收缩秒。从6个腰肌部位（左，右和左L5，L2和L5）记录EMG。对EMG信号进行处理并分析RMS和中频（MF）。两组参数：（a）RMS和MF值的对侧比率（右/左）（b）确定站点L1，L2和L5的RMS和MF值的同侧比率。研究结果表明，急性LBP（ALBP）与正常受试者的EMG信号特征存在差异。关于对侧比率参数，发现与无痛受试者相比，ALBP患者在L1时的平均RMS值更高。在肌肉部位L5，平均RMS（rL5 / lL5）值（“ r”和“ 1”分别代表左右两侧）没有太大差异。与无痛受试者相比，ALBP患者的L1频率中位数（右/左）更低。发现同侧比率参数的结果比对侧比率更一致。通常，ALBP受试者左右两侧的MF比值较高。结果还显示，ALBP受试者的同侧RMS比值高于正常受试者。

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