不同体位下指压不同穴位对脑卒中患者胫前肌和腓骨长、短肌的表面肌电影响

摘要 目的：优化指压穴位刺激法在脑卒中偏瘫治疗中的应用。 方法：30例偏瘫患者,分别在仰卧伸膝0°位和屈膝90°位下指压偏瘫侧足三里、足临泣穴,对比刺激即刻3s、停止刺激后第一个3s、第二个3s、第三个3s的胫前肌和腓骨长、短肌最大等长收缩的积分肌电值（iEMG）。 结果：①刺激前后比较：两种体位下,指压两个穴位,刺激即刻的iEMG明显高于刺激前（P<0.05）,停止刺激后的三个3s的iEMG呈逐渐下降趋势。②穴位间比较：两种体位下,均表现为指压足三里穴,胫前肌刺激即刻的iEMG、停止刺激后的三个3s的iEMG均明显高于足临泣穴（P<0.05）;指压足临泣穴,腓骨长、短肌刺激即刻的iEMG、停止刺激后的三个3s的iEMG均明显高于足三里穴（P<0.05）。③体位间比较：仰卧屈膝90°位指压两个穴位,胫前肌刺激即刻、停止刺激后第一个3s的iEMG明显高于伸膝0°位（P<0.05）;腓骨长、短肌刺激即刻的iEMG明显高于伸膝0°位（P<0.05）。 结论：①指压刺激偏瘫侧足三里、足临泣穴均可诱发偏瘫侧胫前肌和腓骨长、短肌收缩,且即刻效应和延续效应良好。②指压足三里穴对诱发胫前肌收缩的即刻效应和延续效应优于足临泣穴;指压足临泣穴对诱发腓骨长、短肌收缩的即刻效应和延续效应优于足三里穴。③仰卧屈膝90°位,指压刺激足三里、足临泣穴对诱发胫前肌和腓骨长、短肌收缩的即刻效应明显优于伸膝0°位,延续效应无明显差异。     

Prolonged marital stress is associated with short‐lived responses to positive stimuli

Marital stress is associated with a higher incidence of psychiatric disorders, in particular major depression. One pathway through which marital stress may impact emotional health is by compromising emotion‐responding processes. We examined a longitudinal sample of adults (N = 116; 59 males; 39–84 years) to verify how marital stress predicts reactivity to, and recovery from, emotional provocation. Individuals watched positive, neutral, and negative pictures while an objective measure of affective state, corrugator supercilii muscle activity, was recorded continuously. Our results indicate that marital stress is associated with short‐lived responses to positive pictures, indexed by a less persistent decrease in corrugator activity after picture offset. Extending beyond the prior focus on negative emotional processes, these results suggest that social stress may impact health by influencing the time course of responding to positive events.     

Anterior and posterior neck muscle activation during a variety of biting tasks

Bruxism may be involved in the aetiology of myofascial neck pain. The objective of this study was to test the hypothesis that anterior and posterior neck muscles co-contract during jaw clenching. Ten test subjects developed different feedback-controlled submaximum bite forces in a variety of bite-force directions by means of bite-force transducers. The electromyographic activity of the sternocleidomastoid and supra/infrahyoidal muscles, and of the semispinalis capitis, semispinalis cervicis, and multifidi muscles was recorded by use of surface electrodes and intramuscular wire electrodes, respectively. For normalization of electromyography data, maximum voluntary contraction tasks of the neck muscles were conducted in eight different loading directions. The results confirmed co-contraction of the neck muscles in the range of 2-14% of the maximum voluntary contraction at a bite force ranging from 50 to 300 N. Significant activity differences were observed as a result of the different force levels and force directions exerted by the jaw muscles. Long-lasting tonic activation of specific neck muscles triggered by the jaw-clenching tasks was also detected. These findings support the assumption of a relationship between jaw clenching and the activity of the neck muscles investigated. The low level of co-contraction activity, however, requires further study to elucidate possible pathophysiological interactions at the level of single motor units.     

Prominent fatigue in spinal muscular atrophy and spinal and bulbar muscular atrophy: Evidence of activity-dependent conduction block

ObjectivesTo clarify whether patients with spinal muscular atrophy (SMA) or spinal and bulbar muscular atrophy (SBMA) suffer disabling muscle fatigue, and whether activity-dependent conduction block (ADCB) contributes to their fatigue. ADCB is usually caused by reduced safety factor for impulse transmission in demyelinating diseases, whereas markedly increased axonal branching associated with collateral sprouting may reduce the safety factor in chronic lower motor neuron disorders.MethodsWe assessed the fatigue severity scale (FSS) in 22 patients with SMA/SBMA, and in 100 disease controls (multiple sclerosis, myasthenia gravis, chronic inflammatory demyelinating polyneuropathy (CIDP), and axonal neuropathy). We then performed stimulated-single fibre electromyography (s-SFEMG) in the extensor digitorum communis (EDC) muscle of 21 SMA/SBMA patients, 6 CIDP patients, and 10 normal subjects.ResultsThe FSS score was the highest in SMA/SBMA patients [4.9 ± 1.1 (mean ± SD)], with 81% of them complaining of disabling fatigue, compared with normal controls (3.5 ± 1.0), whereas patients with multiple sclerosis (4.3 ± 1.6), myasthenia gravis (4.0 ± 1.6) or CIDP (4.3 ± 1.4) also showed higher FSS score. When 2000 stimuli were delivered at 20 Hz in s-SFEMG, conduction block of single motor axons developed in 46% of patients with SMA/SBMA, and 40% of CIDP patients, but in none of the normal controls.ConclusionSMA/SBMA patients frequently suffer from disabling fatigue presumably caused by ADCB induced by voluntary activity.SignificanceADCB could be the mechanism for muscle fatigue in chronic lower motor neuron diseases.     

Correlation of splint therapy outcome with the electromyography of masticatory muscles in temporomandibular disorder with myofascial pain

Abstract

Objectives. The aim of this study was to assess the effect of occlusal splint therapy on the electromyographic amplitude records (μV) of masticatory muscles in temporomandibular disorder (TMD) with myofascial pain and to detect a possible existence of a relationship between this effect and the treatment outcome. Materials and methods. Forty patients (23 females and 17 males) having TMD with myofascial pain were included in this study. They were randomly divided into two equal groups (20 of each). The first group (A) was treated by occlusal splints for 6 months while the second group (B) acted as a control. A clinical assessment and surface electromyography (EMG) for the masticatory muscles were performed at the beginning of the study, then 6 months later. The collected data were statistically analyzed using paired t-test. The differences were considered significant at p < 0.05. Results. The results showed that 85% of group A either completely recovered (35%) or clinically improved (50%) while only 20% of group B had a spontaneous improvement. In group A, the means of the electromyographic amplitude records (μV) of the monitored muscles have decreased after 6 months. However, the decrease was statistically insignificant (p > 0.05) in the patients (15%) who had no clinical changes. In group B, the means of the muscles' records (μV) in the left side slightly increased while those of the right side slightly decreased. These changes were statistically insignificant (p > 0.05). Conclusions. Occlusal splint could eliminate or improve the signs and symptoms of TMD patients with myofascial pain. It reduces the electromyographic amplitude records (μV) of the masticatory muscles. The splint therapy outcome has a correlation with the electromyographic amplitude changes of the masticatory muscles.     

咬合支持丧失患者修复前后咀嚼肌表面肌电分析

目的：探讨咬合支持丧失患者修复前后咀嚼肌肌电的变化。方法：对24例咬合支持丧失患者进行常规修复,记录不同时期双侧咬肌和颞肌前束在下颌姿势位及牙尖交错紧咬位时的肌电活动,分析肌电幅值、不对称指数及咬肌/颞肌活动指数的变化。结果：（1）修复前后下颌姿势位肌电变化,咬肌肌电幅值和不对称指数在不同时期无明显变化（P〉0.05）;颞肌肌电幅值和不对称指数在义齿戴用3个月以上后显著小于义齿早期（P〈0.05）;咬肌/颞肌前束活动指数在各时期均小于0。（2）修复后牙尖交错位紧咬时肌电变化,咬肌及颞肌前束肌电幅值在戴牙3个月后显著高于戴牙早期（P〈0.05）;不对称指数与初戴牙时接近（P〉0.05）,较戴牙1周及1个月显著减小（P〈0.05）。咬肌/颞肌前束活动指数值在各时期均接近0。结论：咬合支持丧失患者进行咬合重建过程中,咀嚼肌肌电活动在不同时期有所变化。肌电测量可为咬合重建效果的评价提供参考。     

咬合检测材料对咀嚼肌表面肌电的影响

目的探讨不同咬合检测材料在牙尖交错位（ICP）紧咬状态下对咀嚼肌肌电水平的影响。方法筛选30名大学生志愿者,分别在空白对照、口内放入咬合纸、口内放入T-Scan咬合片、口内放人T-Scan咬合架及咬合片（加架咬合片）等四种状况下作ICP最大紧咬,使用Bio-pak肌电图仪分别记录每组双侧颞肌前份（TA）及咬肌（MM）的肌电水平,并对四组数据进行比较分析。结果（1）与对照组相比．咬合纸组、咬合片组、加架咬合片组的TA、MM肌电幅值均升高;除加架咬合片组右侧TA（P〉0．05）外,其他差异均有统计学意义（P〈0．05）。（2）咬合纸组、咬合片组、加架咬合片组两两间比较差异无统计学意义（P〉0．05）。（3）与对照组TA不对称指数相比,咬合纸组、加架咬合片组差异有统计学意义（P〈0．05）,而咬合片组则无统计学意义（P〉0．05）;与对照组的MM不对称指数相比,加架咬合片组不对称指数差异有统计学意义（P〈0．05）,咬合纸组、咬合片组则差异无统计学意义（P〉0．05）。（4）与咬合片组TA不对称指数相比,咬合纸组、加架咬合片组差异有统计学意义（P〈0．05）。结论（1）不同咬合检测材料对所检测咀嚼肌肌电均有影响;（2）与加架咬合片相比．单纯咬合片对所检MM的肌电影响更小,因此对咬合检测结果的干扰更小。     

肛门和尿道括约肌肌电图对多系统萎缩的诊断和鉴别诊断价值

肛门和尿道括约肌肌电图对多系统萎缩（MSA）具有诊断和鉴别诊断价值。本文综述了两种检查方法的解剖及病理生理基础、方法学、正常和异常表现以及在神经系统疾病中的诊断及鉴别诊断价值。目前,两种检查方法对多系统萎缩诊断及鉴别诊断价值仍存在争议,对MSA诊断的特异性及敏感性,二者差异与临床特点的相关性,以及是否可以互相弥补尚未见报道。肛门和尿道括约肌肌电图在MSA时表现为神经源性损害的改变,在怀疑MSA时该项检查可作为常规的电生理检测手段,对于鉴别诊断以及两者之间的相互关系尚有进一步研究的空间。