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Consensus for experimental design in electromyography (CEDE) project: Application of EMG to estimate muscle force 肌电图实验设计共识(CEDE)项目:应用肌电图估算肌肉力量
IF 2 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-06-14 DOI: 10.1016/j.jelekin.2024.102910
Taylor J. M. Dick , Kylie Tucker , François Hug , Manuela Besomi , Jaap H. van Dieën , Roger M. Enoka , Thor Besier , Richard G. Carson , Edward A. Clancy , Catherine Disselhorst-Klug , Deborah Falla , Dario Farina , Simon Gandevia , Aleš Holobar , Matthew C. Kiernan , Madeleine Lowery , Kevin McGill , Roberto Merletti , Eric Perreault , John C. Rothwell , Paul W. Hodges
Skeletal muscles power movement. Deriving the forces produced by individual muscles has applications across various fields including biomechanics, robotics, and rehabilitation. Since direct in vivo measurement of muscle force in humans is invasive and challenging, its estimation through non-invasive methods such as electromyography (EMG) holds considerable appeal. This matrix, developed by the Consensus for Experimental Design in Electromyography (CEDE) project, summarizes recommendations on the use of EMG to estimate muscle force. The matrix encompasses the use of bipolar surface EMG, high density surface EMG, and intra-muscular EMG (1) to identify the onset of muscle force during isometric contractions, (2) to identify the offset of muscle force during isometric contractions, (3) to identify force fluctuations during isometric contractions, (4) to estimate force during dynamic contractions, and (5) in combination with musculoskeletal models to estimate force during dynamic contractions. For each application, recommendations on the appropriateness of using EMG to estimate force and justification for each recommendation are provided. The achieved consensus makes clear that there are limited scenarios in which EMG can be used to accurately estimate muscle forces. In most cases, it remains important to consider the activation as well as the muscle state and other biomechanical and physiological factors— such as in the context of a formal mechanical model. This matrix is intended to encourage interdisciplinary discussions regarding the integration of EMG with other experimental techniques and to promote advances in the application of EMG towards developing muscle models and musculoskeletal simulations that can accurately predict muscle forces in healthy and clinical populations.
骨骼肌为运动提供动力。推导单块肌肉产生的力可应用于生物力学、机器人学和康复等多个领域。由于对人体肌肉力量的直接活体测量具有侵入性和挑战性,因此通过肌电图(EMG)等非侵入性方法估算肌肉力量具有相当大的吸引力。本矩阵由肌电图实验设计共识(CEDE)项目开发,总结了使用 EMG 估算肌力的建议。该矩阵包括使用双极表面肌电图、高密度表面肌电图和肌内肌电图(1)确定等长收缩时肌肉力量的开始,(2)确定等长收缩时肌肉力量的偏移,(3)确定等长收缩时力量的波动,(4)估算动态收缩时的力量,以及(5)结合肌肉骨骼模型估算动态收缩时的力量。对于每种应用,都提供了使用肌电图估算力的适当性建议以及每项建议的理由。已达成的共识表明,在有限的情况下,EMG 可用于准确估算肌肉力量。在大多数情况下,仍需考虑激活、肌肉状态和其他生物力学和生理学因素,如在正式机械模型的背景下。本矩阵旨在鼓励就 EMG 与其他实验技术的整合进行跨学科讨论,并促进 EMG 在开发肌肉模型和肌肉骨骼模拟方面的应用,从而准确预测健康和临床人群的肌肉力量。
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引用次数: 0
Persistent inward currents in tibialis anterior motoneurons can be reliably estimated within the same session 胫骨前运动神经元的持续性内向电流可在同一疗程内可靠估计
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-06-09 DOI: 10.1016/j.jelekin.2024.102911
Thomas Lapole , Ricardo N.O. Mesquita , Stéphane Baudry , Robin Souron , Eleanor K. O’Brien , Callum G. Brownstein , Vianney Rozand

The response of spinal motoneurons to synaptic input greatly depends on the activation of persistent inward currents (PICs), the contribution of which can be estimated through the paired motor unit technique. Yet, the intra-session test–retest reliability of this measurement remains to be fully established. Twenty males performed isometric triangular dorsiflexion contractions to 20 and 50 % of maximal torque at baseline and after a 15-min resting period. High-density electromyographic signals (HD-EMG) of the tibialis anterior were recorded with a 64-electrode matrix. HD-EMG signals were decomposed, and motor units tracked across time points to estimate the contribution of PICs to motoneuron firing through quantification of motor unit recruitment-derecruitment hysteresis (ΔF). A good intraclass correlation coefficient (ICC = 0.75 [0.63, 0.83]) and a large repeated measures correlation coefficient (rrm = 0.65 [0.49, 0.77]; p < 0.001) were found between ΔF values obtained at both time points for 20 % MVC ramps. For 50 % MVC ramps, a good ICC (0.77 [0.65, 0.85]) and a very large repeated measures correlation coefficient (rrm = 0.73 [0.63, 0.80]; p < 0.001) were observed. Our data suggest that ΔF scores can be reliably investigated in tibialis anterior motor units during both low- and moderate-intensity contractions within a single experimental session.

脊髓运动神经元对突触输入的反应在很大程度上取决于持续性内向电流(PIC)的激活,其贡献可通过配对运动单元技术进行估算。然而,这种测量方法的会内测试-重复可靠性仍有待充分确定。20 名男性在基线和休息 15 分钟后分别以最大扭矩的 20% 和 50% 进行等长三角背伸收缩。使用 64 个电极矩阵记录了胫骨前肌的高密度肌电信号(HD-EMG)。对 HD-EMG 信号进行分解,并跟踪各时间点的运动单位,通过量化运动单位募集-去募集滞后(ΔF)来估计 PIC 对运动神经元发射的贡献。对于 20% MVC 坡道,在两个时间点获得的 ΔF 值之间存在良好的类内相关系数 (ICC = 0.75 [0.63, 0.83])和较大的重复测量相关系数 (rrm = 0.65 [0.49, 0.77]; p < 0.001)。对于 50 % MVC 坡道,观察到了良好的 ICC(0.77 [0.65, 0.85])和非常大的重复测量相关系数(rrm = 0.73 [0.63, 0.80];p < 0.001)。我们的数据表明,在一次实验过程中,可以可靠地调查胫骨前肌运动单元在低强度和中等强度收缩时的ΔF评分。
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引用次数: 0
Hamstrings-quadriceps strength ratio could be related to falls in community-living older adults 腘绳肌-股四头肌力量比可能与社区生活的老年人跌倒有关
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-24 DOI: 10.1016/j.jelekin.2024.102900
Feng Yang , Caroline Simpkins , Antoine R Trammell , Aline S Pagnussat

A prior study reported that the concentric strength imbalance between hamstrings and quadriceps is associated with falls in older adults. Given that the concentric strength may not be measured as conveniently as the isometric strength, it is meaningful to test whether the isometric hamstring-quadricep strength imbalance is related to falls among older adults. This study sought to explore whether the hamstrings-quadriceps ratio could differentiate fallers from non-fallers in community-dwelling older adults. One hundred and eleven older adults were included in this cross-sectional study. Their isometric knee joint strength capacity (extensors and flexors) was measured. Based on their fall history in the past year, they were classified as fallers (at least one fall) or non-fallers (no fall). The hamstrings-quadriceps ratio was compared between the faller and non-faller groups. The receiver operating characteristic analysis was used to determine the cutoff value of the hamstrings-quadriceps ratio able to best classify fallers and non-fallers. Fallers showed a significantly lower hamstrings-quadriceps ratio than non-fallers (p = 0.008). The receiver operating characteristic analysis identified 0.733 as the best ratio to differentiate fallers from non-fallers with an accuracy of 64.0 %. A 0.1-unit reduction in the hamstrings-quadriceps ratio increases the probability of falling by a factor of 1.30. The hamstrings-quadriceps ratio could be used as an additional fall risk factor when assessing the risk of falls among older adults. A smaller than 0.733 hamstring-quadriceps ratio may indicate a high risk of falls.

之前的一项研究报告指出,腘绳肌和股四头肌之间的同心力量失衡与老年人跌倒有关。鉴于同心力量的测量可能不如等长力量方便,因此测试等长腘绳肌-股四头肌力量失衡是否与老年人跌倒有关很有意义。本研究试图探讨腘绳肌-股四头肌比率是否能区分社区老年人中的跌倒者和非跌倒者。这项横断面研究共纳入了 111 名老年人。研究人员测量了他们的等长膝关节力量(伸肌和屈肌)。根据过去一年的跌倒史,他们被分为跌倒者(至少跌倒过一次)和非跌倒者(没有跌倒过)。比较了跌倒组和非跌倒组的腘绳肌-股四头肌比率。接受者操作特征分析用于确定腘绳肌-股四头肌比率的临界值,该值能够对跌倒者和非跌倒者进行最佳分类。跌倒者的腘绳肌-股四头肌比率明显低于非跌倒者(p = 0.008)。接受者操作特征分析表明,0.733 是区分跌倒者和非跌倒者的最佳比率,准确率为 64.0%。腘绳肌-股四头肌比率每降低 0.1 个单位,跌倒的概率就会增加 1.30 倍。在评估老年人跌倒风险时,腘绳肌-股四头肌比率可作为额外的跌倒风险因素。小于 0.733 的腘绳肌-股四头肌比率可能表明跌倒风险较高。
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引用次数: 0
Strength and activity of the protractor and retractor muscles of the asymptomatic dyskinetic scapula 无症状运动障碍肩胛骨的牵引肌和牵开肌的强度和活动度
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-24 DOI: 10.1016/j.jelekin.2024.102899
Cédric Schwartz , Camille Tooth , Amandine Gofflot , Géraldine Martens , Jean-Louis Croisier , Vincent Denoël , Olivier Brüls , Bénédicte Forthomme

The role of scapular dyskinesis as a risk factor of shoulder injury has been largely discussed. However, most studies have focused on symptomatic patients and less is known on the asymptomatic dyskinetic scapula. Removing the confounding effects of the pathologies could contribute to better characterize the scapula dyskinesis. As muscle properties (strength, fatigue, nerve injury …) have been identified as causative factors of scapular dyskinesis, this study focuses specifically on characterizing the protractor and retractor muscles of the dyskinetic scapula. Thirteen asymptomatic dyskinetic volunteers were compared to eleven asymptomatic non-dyskinetic control volunteers. Muscle characteristics were evaluated in terms of maximal strength, fatigue resistance and electromyographic activity during a functional closed-chained task. The results did not identify kinematic or muscle activity significant differences between the dyskinetic and the control group even in fatigue conditions. However, the results demonstrated that protractors vs. retractors fatigue resistance ratios were imbalanced (<0.8) in the dyskinetic group and significantly lower than in the non-dyskinetic one. Our study suggests that that strength imbalances are not necessarily related to the presence of pain at the shoulder joint. These results demonstrated the importance to complete the clinical assessments of the scapula with strength evaluations even for asymptomatic sport practitioners.

肩胛运动障碍作为肩部损伤的一个危险因素,其作用已被广泛讨论。然而,大多数研究都集中在有症状的患者身上,对无症状的肩胛运动障碍了解较少。排除病理因素的干扰有助于更好地描述肩胛运动障碍的特征。由于肌肉特性(力量、疲劳、神经损伤......)已被确定为肩胛运动障碍的致病因素,本研究特别关注运动障碍肩胛骨的牵引肌和牵开肌的特征。13 名无症状的运动障碍志愿者与 11 名无症状的非运动障碍对照志愿者进行了比较。从最大力量、抗疲劳性和功能性闭链任务中的肌电活动等方面对肌肉特征进行了评估。结果发现,即使在疲劳条件下,运动障碍组和对照组之间的运动学或肌肉活动也没有明显差异。然而,研究结果表明,在运动障碍组中,伸缩器与牵引器的疲劳阻力比是不平衡的(0.8),明显低于非运动障碍组。我们的研究表明,力量失衡与肩关节疼痛没有必然联系。这些结果表明,即使是无症状的体育从业人员,在进行肩胛骨临床评估时,也必须同时进行力量评估。
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引用次数: 0
Impact of acute hypoxic exposure on neuromuscular and hemodynamic responses during step intensity dynamic constant external resistance leg extension exercise 急性缺氧对阶梯强度动态恒定外阻力伸腿运动中神经肌肉和血液动力学反应的影响。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-15 DOI: 10.1016/j.jelekin.2024.102887
Cierra B. Ugale, Owen F. Salmon, Matt D. Segovia, Cory M. Smith

Objectives

This study examined the effects of acute normoxic and hypoxic exposure on neuromuscular and hemodynamic physiological responses performed during dynamic step muscle actions.

Methods

Thirteen recreationally active men (mean ± SD age: 21.2 ± 2.9 yrs) performed dynamic leg extensions unilaterally under Normoxic (FiO2 = 21 %) and Hypoxic (FiO2 = 13 %) conditions in a randomized order at 20 %, 40 %, 60 %, 80 %, and 100 % of their maximal strength. Electromyographic (EMG) amplitude, EMG frequency, (Oxygenated and Deoxygenated hemoglobin; OxyHb, DeoxyHb), Total hemoglobin (TotalHb), and skeletal muscle tissue oxygenation status (StO2) were measured from the vastus lateralis during all contractions.

Results

There were no detectable differences in the neuromuscular responses between normoxia and hypoxia for EMG amplitude (p = 0.37–0.74) and frequency (p = 0.17–0.83). For EMG amplitude there were general increases with intensity (p < 0.01–0.03). EMG frequency remained similar from 20% to 80% and then increased at 100 % effort (p = 0.02). There was no significant difference in patterns of responses for OxyHb (p = 0.870) and TotalHb (p = 0.200) between normoxia and hypoxia. StO2 (p = 0.028) decreased and DeoxyHb (p = 0.006) increased under hypoxia compared to normoxia during dynamic step muscle actions performed in a randomized order.

Conclusion

Unlike fatigue, acute hypoxemia in an unfatigued state does not impact the localized neuromuscular responses, but minimally impacts the hemodynamic responses.

研究目的本研究探讨了急性常氧和低氧暴露对动态迈步肌肉动作过程中神经肌肉和血液动力学生理反应的影响:13 名从事娱乐活动的男性(平均 ± SD 年龄:21.2 ± 2.9 岁)在常氧(FiO2 = 21 %)和缺氧(FiO2 = 13 %)条件下,以最大力量的 20 %、40 %、60 %、80 % 和 100 % 的随机顺序单侧进行动态腿部伸展。在所有收缩过程中,测量了阔筋膜肌的肌电图(EMG)振幅、EMG频率、(氧合血红蛋白和脱氧血红蛋白;OxyHb、DeoxyHb)、总血红蛋白(TotalHb)和骨骼肌组织氧合状态(StO2):在肌电图振幅(p = 0.37-0.74)和频率(p = 0.17-0.83)方面,常氧和缺氧状态下的神经肌肉反应没有发现差异。就肌电图振幅而言,常氧和缺氧状态下的肌电图振幅普遍随着强度的增加而增加(p 血红蛋白(p = 0.870)和总血红蛋白(p = 0.200)。在以随机顺序进行的动态台阶肌肉动作中,与常氧状态相比,缺氧状态下的血氧饱和度(p = 0.028)降低,脱氧血红蛋白(p = 0.006)升高:与疲劳不同,未疲劳状态下的急性低氧血症不会影响局部神经肌肉反应,但对血液动力学反应的影响很小。
{"title":"Impact of acute hypoxic exposure on neuromuscular and hemodynamic responses during step intensity dynamic constant external resistance leg extension exercise","authors":"Cierra B. Ugale,&nbsp;Owen F. Salmon,&nbsp;Matt D. Segovia,&nbsp;Cory M. Smith","doi":"10.1016/j.jelekin.2024.102887","DOIUrl":"10.1016/j.jelekin.2024.102887","url":null,"abstract":"<div><h3>Objectives</h3><p>This study examined the effects of acute normoxic and hypoxic exposure on neuromuscular and hemodynamic physiological responses performed during dynamic step muscle actions.</p></div><div><h3>Methods</h3><p>Thirteen recreationally active men (mean ± SD age: 21.2 ± 2.9 yrs) performed dynamic leg extensions unilaterally under Normoxic (FiO<sub>2</sub> = 21 %) and Hypoxic (FiO<sub>2</sub> = 13 %) conditions in a randomized order at 20 %, 40 %, 60 %, 80 %, and 100 % of their maximal strength. Electromyographic (EMG) amplitude, EMG frequency, (Oxygenated and Deoxygenated hemoglobin; Oxy<sub>Hb</sub>, Deoxy<sub>Hb)</sub>, Total hemoglobin (Total<sub>Hb</sub>), and skeletal muscle tissue oxygenation status (StO<sub>2</sub>) were measured from the vastus lateralis during all contractions.</p></div><div><h3>Results</h3><p>There were no detectable differences in the neuromuscular responses between normoxia and hypoxia for EMG amplitude (<em>p</em> = 0.37–0.74) and frequency (<em>p</em> = 0.17–0.83). For EMG amplitude there were general increases with intensity (<em>p</em> &lt; 0.01–0.03). EMG frequency remained similar from 20% to 80% and then increased at 100 % effort (<em>p</em> = 0.02). There was no significant difference in patterns of responses for Oxy<sub>Hb</sub> (<em>p</em> = 0.870) and Total<sub>Hb</sub> (<em>p</em> = 0.200) between normoxia and hypoxia. StO<sub>2</sub> (<em>p</em> = 0.028) decreased and Deoxy<sub>Hb</sub> (<em>p</em> = 0.006) increased under hypoxia compared to normoxia during dynamic step muscle actions performed in a randomized order.</p></div><div><h3>Conclusion</h3><p>Unlike fatigue, acute hypoxemia in an unfatigued state does not impact the localized neuromuscular responses, but minimally impacts the hemodynamic responses.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"77 ","pages":"Article 102887"},"PeriodicalIF":2.5,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140961213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Older age is associated with decreased overall shoulder strength but not direction-specific differences in the three-dimensional feasible torque space 年龄越大,肩部整体力量越小,但三维可行扭矩空间中特定方向的差异却越小
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-15 DOI: 10.1016/j.jelekin.2024.102889
Emma M. Baillargeon , Amee L. Seitz , Daniel Ludvig , Constantine P. Nicolozakes , Swati D. Deshmukh , Eric J. Perreault

Shoulder strength is reduced in older adults but has only been assessed in planar motions that do not reflect the diverse requirements of daily tasks. We quantified the impact of age on strength spanning the three degrees of freedom relevant to shoulder function, referred to as the feasible torque space. We hypothesized that the feasible torque space would differ with age and expected this age-effect to reflect direction-specific deficits. We measured strength in 32 directions to characterize the feasible torque space of the shoulder in participants without shoulder pain or tendinous pathology (n = 39, 19–86 years). We modeled the feasible torque space for each participant as an ellipsoid, computed the ellipsoid size and direction-specific metrics (ellipsoid position, orientation, and shape), and then tested the effect of age on each metric. Age was negatively associated with ellipsoid size (a measure of overall strength magnitude; −0.0033 ± 0.0007 (Nm/kg)/year, p < 0.0001). Contrary to our expectation, the effect of age on the direction-specific metrics did not reach statistical significance. The effect of age did not differ significantly between male and female participants. Three-dimensional strength measurements allowed us to constrain the direction of participants’ maximum torque production and characterize the entire feasible torque space. Our findings support a generalized shoulder strengthening program to address age-related shoulder weakness in those without pain or pathology. Clinical exam findings of imbalanced weakness may suggest underlying pathology beyond an effect of age. Longitudinal studies are needed to determine the positive or negative impact of our results.

老年人的肩部力量会减弱,但只在平面运动中进行过评估,无法反映日常任务的各种要求。我们量化了年龄对与肩关节功能相关的三个自由度(称为可行扭矩空间)强度的影响。我们假设可行扭矩空间会随着年龄的增长而变化,并预期这种年龄效应会反映出特定方向的缺陷。我们测量了没有肩痛或肌腱病变的参与者(39 人,19-86 岁)在 32 个方向上的力量,以确定肩部可行扭矩空间的特征。我们将每位参与者的可行扭矩空间建模为一个椭圆体,计算了椭圆体的大小和特定方向的指标(椭圆体的位置、方向和形状),然后测试了年龄对每个指标的影响。年龄与椭圆体大小呈负相关(衡量整体力量大小的指标;-0.0033 ± 0.0007 (牛米/公斤)/年,p < 0.0001)。与我们的预期相反,年龄对特定方向指标的影响没有达到统计学意义。年龄对男性和女性参与者的影响也没有显著差异。三维力量测量使我们能够限制参与者产生最大扭矩的方向,并确定整个可行扭矩空间的特征。我们的研究结果表明,在没有疼痛或病变的情况下,我们可以通过普及肩部力量训练计划来解决与年龄有关的肩部无力问题。不平衡无力的临床检查结果可能表明,除了年龄的影响外,还有潜在的病理因素。我们还需要进行纵向研究,以确定我们的研究结果会产生积极还是消极的影响。
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引用次数: 0
Acute neuromuscular responses to whole-body vibration in healthy individuals: A systematic review 健康人对全身振动的急性神经肌肉反应:系统综述
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-14 DOI: 10.1016/j.jelekin.2024.102888
Saleh AlBaiti , Ashokan Arumugam , Naser Nawayseh

Whole-body vibration (WBV) training has been employed alongside conventional exercise like resistance training to enhance skeletal muscle strength and performance. This systematic review examines the evidence regarding the effect of WBV on muscle activity, strength, and performance in healthy individuals. The Academic Search Ultimate, CINAHL, Cochrane CENTRAL, PubMed, ProQuest One Academic and SCOPUS databases were searched from 1990 to April 2023 to retrieve relevant studies. Methodological quality was assessed using the Modified Downs and Black checklist, while the level of evidence was evaluated through the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) tool. Even though the quality of the included studies was moderate to high, the level of evidence was very low owing to serious concerns with three or more GRADE domains (risk of bias, inconsistency, indirectness, imprecision, and publication bias) for each outcome of interest across studies. The review suggests that in WBV training, using moderate to high vibration frequencies (25–40 Hz) and high magnitudes (3–6 mm) can enhance muscle activation and strength in pelvis and lower limb muscles. However, findings regarding WBV effect on muscle performance measures were inconsistent. Future research with robust methodology is necessary in this area to validate and support these findings.

全身振动(WBV)训练已与阻力训练等传统运动一起被用于增强骨骼肌的力量和表现。本系统综述研究了有关全身振动对健康人肌肉活动、力量和表现的影响的证据。从 1990 年到 2023 年 4 月,在 Academic Search Ultimate、CINAHL、Cochrane CENTRAL、PubMed、ProQuest One Academic 和 SCOPUS 数据库中检索了相关研究。方法学质量采用改良的唐斯和布莱克核对表进行评估,证据水平则采用建议、评估、发展和评价分级(GRADE)工具进行评估。尽管所纳入研究的质量为中高水平,但证据水平却很低,原因是各项研究的每个结果都存在三个或更多 GRADE 领域(偏倚风险、不一致性、间接性、不精确性和发表偏倚)的严重问题。综述表明,在 WBV 训练中,使用中高振动频率(25-40 Hz)和高振幅(3-6 mm)可增强骨盆和下肢肌肉的激活和力量。然而,有关 WBV 对肌肉性能测量影响的研究结果并不一致。未来有必要在这一领域开展采用可靠方法的研究,以验证和支持这些发现。
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引用次数: 0
Tutorial on MUedit: An open-source software for identifying and analysing the discharge timing of motor units from electromyographic signals MUedit 教程:从肌电信号中识别和分析运动单元放电时间的开源软件。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-05-13 DOI: 10.1016/j.jelekin.2024.102886
Simon Avrillon , François Hug , Stuart N Baker , Ciara Gibbs , Dario Farina

We introduce the open-source software MUedit and we describe its use for identifying the discharge timing of motor units from all types of electromyographic (EMG) signals recorded with multi-channel systems. MUedit performs EMG decomposition using a blind-source separation approach. Following this, users can display the estimated motor unit pulse trains and inspect the accuracy of the automatic detection of discharge times. When necessary, users can correct the automatic detection of discharge times and recalculate the motor unit pulse train with an updated separation vector. Here, we provide an open-source software and a tutorial that guides the user through (i) the parameters and steps of the decomposition algorithm, and (ii) the manual editing of motor unit pulse trains. Further, we provide simulated and experimental EMG signals recorded with grids of surface electrodes and intramuscular electrode arrays to benchmark the performance of MUedit. Finally, we discuss advantages and limitations of the blind-source separation approach for the study of motor unit behaviour during tonic muscle contractions.

我们介绍了开源软件 MUedit,并介绍了该软件用于从多通道系统记录的各类肌电图(EMG)信号中识别运动单元的放电时间。MUedit 采用盲源分离方法进行 EMG 分解。随后,用户可以显示估计的运动单元脉冲串,并检查自动检测放电时间的准确性。必要时,用户可以纠正放电时间的自动检测,并使用更新的分离向量重新计算运动单元脉冲串。在此,我们提供了一个开源软件和教程,指导用户 (i) 分解算法的参数和步骤,以及 (ii) 手动编辑运动单元脉冲串。此外,我们还提供了通过表面电极网格和肌肉内电极阵列记录的模拟和实验肌电信号,以对 MUedit 的性能进行基准测试。最后,我们讨论了盲源分离法在研究肌肉强直收缩时运动单元行为方面的优势和局限性。
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引用次数: 0
Clustering index analysis on EMG-Torque relation-based representation of complex neuromuscular changes after spinal cord injury 基于肌电图-力矩关系的脊髓损伤后复杂神经肌肉变化表征的聚类指数分析
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-04-26 DOI: 10.1016/j.jelekin.2024.102885
Xiang Wang , Le Li , Yongli Wei , Ping Zhou

Spinal cord injury (SCI) resulting in complex neuromuscular pathology is not sufficiently well understood. To better quantify neuromuscular changes after SCI, this study uses a clustering index (CI) method for surface electromyography (sEMG) clustering representation to investigate the relation between sEMG and torque in SCI survivors. The sEMG signals were recorded from 13 subjects with SCI and 13 gender-age matched able-bodied subjects during isometric contraction of the biceps brachii muscle at different torque levels using a linear electrode array. Two torque representations, maximum voluntary contraction (MVC%) and absolute torque, were used. CI values were calculated for sEMG. Regression analyses were performed on CI values and torque levels of elbow flexion, revealing a strong linear relationship. The slopes of regressions between SCI survivors and control subjects were compared. The findings indicated that the range of distribution of CI values and slopes was greater in subjects with SCI than in control subjects (p < 0.05). The increase or decrease in slope was also observed at the individual level. This suggests that the CI and its sEMG clustering-torque relation may serve as valuable quantitative indicators for determining neuromuscular lesions after SCI, contributing to the development of effective rehabilitation strategies for improving motor performance.

人们对脊髓损伤(SCI)导致的复杂神经肌肉病理变化了解不够。为了更好地量化 SCI 后的神经肌肉变化,本研究采用聚类指数(CI)方法对表面肌电图(sEMG)进行聚类表示,以研究 SCI 幸存者的 sEMG 与扭矩之间的关系。使用线性电极阵列记录了 13 名 SCI 受试者和 13 名性别年龄匹配的健全受试者在肱二头肌等长收缩时不同扭矩水平的 sEMG 信号。采用了最大自主收缩(MVC%)和绝对扭矩两种扭矩表示方法。计算 sEMG 的 CI 值。对 CI 值和肘关节屈曲的扭矩水平进行回归分析,结果显示两者之间存在很强的线性关系。对 SCI 幸存者和对照组之间的回归斜率进行了比较。结果表明,与对照组相比,SCI 受试者的 CI 值和斜率的分布范围更大(p < 0.05)。在个体水平上也观察到斜率的增减。这表明,CI 及其 sEMG 聚类-力矩关系可作为确定 SCI 后神经肌肉病变的有价值的定量指标,有助于制定有效的康复策略以改善运动表现。
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引用次数: 0
Effects of triceps surae exercise-induced delayed onset muscle soreness on control of body stability in different postures 肱三头肌运动诱发的迟发性肌肉酸痛对不同姿势下身体稳定性控制的影响
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2024-04-04 DOI: 10.1016/j.jelekin.2024.102882
Milena A. dos Santos , Andressa L. Lemos , Mathias S. Machado , Laura de O.C. Lazaro , Marieli M. Paz , Andre Gustavo P. de Andrade , Felipe P. Carpes

This research aimed to determine whether triceps surae delayed onset muscle soreness (DOMS) affects stability while performing different postural control tasks requiring upright and landing stabilization. Twenty-four participants who self-reported as healthy were recruited. Pre and 48 h after a protocol to induce DOMS in the triceps surae, participants were evaluated for DOMS perception, pressure pain threshold, and postural control (assessed by the center of pressure, CoP) during different standing and landing stabilization tasks. We found higher DOMS perception and lower pressure pain threshold 48 h after the exercise. Mediolateral CoP displacement was more sensitive to DOMS across different postural tasks, but no effects were found for bilateral standing. The landing time to stabilization elicited high individual variability in the presence of DOMS. Effects of DOMS in the performance of less challenging tasks, such as bipedal standing, were not found. We conclude that DOMS in the triceps surae impairs mediolateral postural control during challenging tasks such as unilateral standing and body forward lean. It highlights the need for caution and individualized approaches when incorporating movements requiring frontal plane control in training and rehabilitation sessions under the presence of DOMS.

本研究旨在确定肱三头肌延迟性肌肉酸痛(DOMS)是否会影响完成需要直立和着地稳定的不同姿势控制任务时的稳定性。研究招募了 24 名自称身体健康的参与者。在诱导肱三头肌出现 DOMS 的方案实施前和实施后 48 小时,我们对参与者的 DOMS 感知、压痛阈值以及在完成不同的站立和着地稳定任务时的姿势控制(通过压力中心 CoP 评估)进行了评估。我们发现,运动后 48 小时,DOMS 感知较高,压痛阈值较低。在不同的姿势任务中,内外侧 CoP 位移对 DOMS 更敏感,但对双侧站立没有影响。在存在 DOMS 的情况下,着地稳定时间的个体差异性很大。在挑战性较低的任务(如双足站立)中,未发现 DOMS 的影响。我们的结论是,在单侧站立和身体前倾等具有挑战性的任务中,肱三头肌的肌张力障碍会损害内外侧姿势控制。这强调了在存在肌肉萎缩综合症的情况下,在训练和康复课程中加入需要额平面控制的动作时,需要谨慎并采取个性化的方法。
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Journal of Electromyography and Kinesiology
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