Journal of Electromyography and Kinesiology最新文献_第6页

Comparing motor unit number estimation techniques 比较运动单元数估计技术

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-29 DOI: 10.1016/j.jelekin.2025.103030

M.I.B. Debenham , O. Roussel , C.J. McNeil , M.J. Berger , B.H. Dalton

It is unclear how comparable motor unit number estimates (MUNEs) are when derived from a non-invasive technique involving repetitive peripheral nerve stimulation vs. one involving volitional contractions and intramuscular recordings of single motor units (MUs). Therefore, this study examined MUNEs from MScanFit (MScan) and Decomposition-Enhanced Spike-Triggered Averaging (DE-STA). Eighteen participants (8 females, 10 males; 29.7 ± 7.1 years) sat with their right leg positioned in an isometric myograph while surface electromyography (EMG) was recorded from the tibialis anterior (TA). The MScan protocol isolated and derived the size of single MUs by repeatedly stimulating the common fibular nerve at progressively weaker currents to model a compound muscle action potential (CMAP) stimulus–response curve. For DE-STA, a concentric needle electrode was inserted into the TA, and participants performed 30-s isometric dorsiflexion contractions at 25 % of maximal voluntary torque to obtain ≥20 individual surface MU potentials (S-MUPs; i.e., single MUs extracted from the surface EMG signal based on needle-detected spikes). Both techniques used the same maximal CMAP to calculate a MUNE, yet MScan used a mathematical model to simulate the recorded CMAP stimulus–response, which was compared to the recorded scan to minimize disagreement; whereas DE-STA compared the size of the maximal CMAP to the average S-MUP. There was no difference between the MUNE calculated via DE-STA (132 ± 26 MUs) and MScan (142 ± 22 MUs; p = 0.11), and the bias (10.0 MUs) and limits of agreement (67.6 vs −47.6 MU difference) suggests that either technique may independently offer a reasonable MU estimate for the TA of young adults.

目前尚不清楚，重复性周围神经刺激的非侵入性技术与意志收缩和单个运动单位（MUs）的肌肉内记录的技术相比，可比性运动单位数估计（MUNEs）的效果如何。因此，本研究检查了MScanFit （MScan）和分解增强峰值触发平均（DE-STA）的MUNEs。18名参与者(女性8人，男性10人；29.7±7.1岁)坐下，右腿定位于等长肌图，记录胫骨前肌（TA）的肌表电图（EMG）。MScan方案通过以逐渐变弱的电流反复刺激腓骨总神经来模拟复合肌肉动作电位（CMAP）刺激-反应曲线，从而分离并推导出单个MUs的大小。对于DE-STA，将一个同心针电极插入TA，参与者以最大自主扭矩的25%进行30秒的等长背屈收缩，以获得≥20个个体表面MU电位（S-MUPs）；即，根据针检测到的尖峰从表面肌电信号中提取单个mu)。两种技术都使用相同的最大CMAP来计算MUNE，但MScan使用数学模型来模拟记录的CMAP刺激反应，并将其与记录的扫描进行比较，以尽量减少差异；而DE-STA将最大CMAP的大小与平均S-MUP进行比较。通过DE-STA计算的MUNE（132±26 MUs）与MScan计算的MUNE（142±22 MUs）无差异；p = 0.11)，偏差（10.0 MU）和一致性限制（67.6 vs - 47.6 MU差异）表明，这两种技术都可以独立地为年轻人的TA提供合理的MU估计。

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引用次数: 0

Shoulder load during wheelchair-related activities of daily life 日常生活中与轮椅有关的活动中的肩部负荷

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-20 DOI: 10.1016/j.jelekin.2025.103027

Ursina Arnet , Dirkjan (H. E. J.) Veeger , Wiebe H.K. de Vries

Manual wheelchair users experience significant upper extremity strain, leading to a high prevalence of shoulder pain. Identifying modifiable risk factors for shoulder complaints is crucial for developing effective interventions. Consequently, it’s important to quantify shoulder load (magnitude, frequency and duration) experienced by manual wheelchair users throughout the day.

This study aims to quantify the magnitude of shoulder load during various daily activities, including wheelchair propulsion at different speeds and inclines, ascending and descending ramps, weight relief lift, material handling and desk work. Ten able-bodied participants performed these activities while their upper extremity kinematics and exerted forces were measured. The analysis focused on glenohumeral contact force and rotator cuff muscle forces using the Delft Shoulder and Elbow Model.

Highest mean glenohumeral contact forces were found during weight relief lift (1363 ± 1204 N), followed by descending a ramp (997 ± 1043 N) and fast propulsion (802 ± 742 N). The supraspinatus muscle generated the greatest force during weight relief lift (327 ± 490 N) and fast propulsion (184 ± 205 N). These findings provide a first reference for estimating joint load in daily activities. By combining these data with the individual activity frequency and duration, personalized shoulder load exposure can be assessed, informing the development of targeted interventions to reduce shoulder pain in manual wheelchair users.

手动轮椅使用者会经历明显的上肢劳损，导致肩部疼痛的高发。确定可改变的肩部疾病风险因素对于制定有效的干预措施至关重要。因此，量化手动轮椅使用者全天所经历的肩部负荷（强度、频率和持续时间）是很重要的。本研究旨在量化各种日常活动中肩负荷的大小，包括轮椅在不同速度和倾斜度下的推进，上升和下降的斜坡，减轻重量的升降机，物料搬运和案头工作。10名身体健全的参与者在进行这些活动的同时，测量了他们的上肢运动学和施加的力。使用Delft肩肘模型分析肩关节接触力和肩袖肌肉力。平均肩关节接触力在卸重提升（1363±1204 N）时最高，其次是下降坡道（997±1043 N）和快速推进（802±742 N）。在负重提升（327±490 N）和快速推进（184±205 N）时冈上肌产生的力最大。这些发现为估计日常活动中的关节负荷提供了第一个参考。通过将这些数据与个人活动频率和持续时间相结合，可以评估个性化的肩部负荷暴露，为制定有针对性的干预措施提供信息，以减少手动轮椅使用者的肩部疼痛。

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引用次数: 0

The Probability Density Function (PDF) of surface EMG with increasing force: a comparison between the tibialis anterior and the vastus lateralis 增加力的表面肌电的概率密度函数：胫骨前肌和股外侧肌的比较

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-20 DOI: 10.1016/j.jelekin.2025.103029

Silvia Recalde-Villamayor , Javier Navallas , Cristina Mariscal , Armando Malanda , Javier Rodriguez-Falces

Objectives

The process by which the surface EMG signal is progressively filled up with motor unit potentials has so far been investigated only in the quadriceps muscles. However, the sEMG filling process is influenced by anatomical, physiological, and neural factors, and thus may be different for each muscle. Here, we sought to characterize the sEMG filling process of the tibialis anterior (TA) and compare it to that of the vastus lateralis (VL).

Methods

Surface EMG signals were recorded from the TA and VL muscles of healthy subjects as force was gradually increased from 0 to 80% MVC. The sEMG filling process was analyzed by measuring the EMG filling factor (FF), an index determined by the shape of the probability density function (PDF) of the sEMG signal.

Results

(1) The sEMG filling process showed significant differences between the TA and VL muscles (p < 0.05).

(2) In the TA, the degree of sEMG filling at the onset of the contraction was low (FF < 0.45) for 72 % of male subjects and 53 % of female subjects, whereas, in the VL, the degree of initial sEMG filling was low for 89 % of male subjects, but only in 12 % of female subjects.

(3) In the TA, the sEMG at high forces (>40 % MVC) contained spikes with largely different amplitudes (FF ∼ 0.5), whereas, in the VL, the sEMG contained spikes with comparable amplitudes (FF ∼ 0.63).

Conclusions

(1) At high forces, the TA PDF was close to Laplacian, whilst the VL PDF was nearly Gaussian; (2) The sEMG filling curves are more informative in the TA than in the VL; (3) The sEMG filling process is muscle and gender specific.

目的：表面肌电信号逐渐充满运动单位电位的过程迄今为止仅在股四头肌中进行了研究。然而，肌电信号填充过程受解剖、生理和神经因素的影响，因此每块肌肉的肌电信号填充过程可能是不同的。在这里，我们试图描述胫骨前肌（TA）的肌电信号填充过程，并将其与股外侧肌（VL）的肌电信号填充过程进行比较。方法记录健康受试者从0 ~ 80% MVC逐渐增加时TA肌和VL肌的表面肌电信号。通过测量表面肌电信号概率密度函数（PDF）的形状决定的表面肌电信号填充因子（FF）来分析表面肌电信号填充过程。结果(1)表面肌和VL肌的表面肌电信号填充过程存在显著差异(p <；(2)在TA区，收缩开始时肌表肌电信号充盈程度较低(FF <；0.45), 72%的男性和53%的女性主题,然而,六世,初始表填写很低程度的男性受试者的89%,但只有12%的女性主题。(3)在助教,面肌电信号在高力量(MVC)在40%包含峰值很大程度上不同的振幅(FF∼0.5),然而,六世,面肌电信号包含峰值与可比振幅(FF∼0.63).Conclusions(1)在高力量,助教PDF接近拉普拉斯算子,而六世PDF近高斯分布;(2)表面肌电信号填充曲线在TA区比在VL区更具信息量；(3)表面肌电信号填充过程具有肌肉和性别特异性。

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引用次数: 0

A standard operating procedure for the evaluation of vertical jumps performance through surface electromyography assessment: A scoping review 通过表面肌电图评估评估垂直跳跃性能的标准操作程序：范围审查

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-20 DOI: 10.1016/j.jelekin.2025.103028

Luca Petrigna , Alessandra Amato , Giorgia Longo , Alessandro Castorina , Simona Pajaujiene , Giuseppe Musumeci

Introduction

The Countermovement Jump (CMJ) and the Squat Jump (SJ) are widely adopted tests to assess muscle strength and power. Neuromuscular data of the jump performance could be provided by surface Electromyography (EMG). While from a biomechanical and technical point of view, there are articles that support the two vertical jumps, less is published regarding surface EMG and the jumps. The objective of the present study was to review the literature to better understand the protocols adopted for a surface EMG evaluation during the CMJ and the SJ and eventually to propose a Standard Operating Procedure (SOP). A SOP could be a useful tool to better understand, compare, and interpret the findings.

Methods

A scoping review was performed. Data were collected on PubMed, Web of Science, and Scopus till 20^th December 2024. The articles were screened against the eligibility criteria and narratively discussed.

Results

A total of 54 articles met the eligibility criteria. The articles present important differences in the methodology and the procedures followed. Differences were also detected in the hardware and the data analysis. From the common information of the articles, a SOP was proposed.

Conclusions

Different methodologies were adopted to evaluate neuromuscular function during the CMJ and the SJ tests. This makes difficult to compare the data. A SOP was proposed with information and guidelines related to muscles, hardware, and data processing. In this way, future studies could follow similar protocols increasing the possibility to compare the findings.

反向起跳（CMJ）和深蹲起跳（SJ）是被广泛采用的评估肌肉力量和力量的测试。表面肌电图（EMG）可以提供跳跃性能的神经肌肉数据。虽然从生物力学和技术的角度来看，有文章支持两种垂直跳跃，但关于表面肌电图和跳跃的文章较少。本研究的目的是回顾文献，以更好地了解在CMJ和SJ期间采用的表面肌电评估方案，并最终提出标准操作程序（SOP）。SOP可以成为更好地理解、比较和解释调查结果的有用工具。方法进行范围综述。数据收集于PubMed、Web of Science和Scopus，截止到2024年12月20日。根据资格标准对文章进行筛选并进行叙述讨论。结果54篇文章符合入选标准。这两篇文章在方法和所遵循的程序方面存在重要差异。在硬件和数据分析方面也发现了差异。根据文章的共同信息，提出了SOP。结论在CMJ和SJ试验中采用不同的方法评价神经肌肉功能。这使得比较数据变得困难。我们提出了一个SOP，其中包含与肌肉、硬件和数据处理相关的信息和指南。通过这种方式，未来的研究可以遵循类似的协议，增加比较研究结果的可能性。

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引用次数: 0

The relationship between voluntary and electrically evoked muscle contractile properties in young women 年轻女性随意肌和电诱发肌收缩特性之间的关系

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-10 DOI: 10.1016/j.jelekin.2025.103024

Madison J. Fry, William S. Zoughaib, Richard L. Hoffman, Andrew R. Coggan

Isokinetic dynamometry and neuromuscular electrical stimulation [NMES] are commonly used to assess muscle contractile function, but few studies have investigated the relationship between the two, particularly in women. Thirty young women (age 23 ± 5 y) therefore performed maximal knee extensions on an isokinetic dynamometer at angular velocities of 0.00–6.28 rad/s, after which NMES of the quadriceps was used to determine unpotentiated and potentiated twitch contractile properties as well as the torque-frequency relationship. Voluntary isometric peak torque was correlated with peak torque, absolute rate of torque development, and the absolute rate of relaxation during potentiated twitches (ie, r = 0.557, 0.585, and −0.650, P = 0.00786, 0.00411, and 0.000779, respectively). Voluntary isokinetic peak torques at 1.57 and 3.14 rad/s were also correlated with the potentiated absolute rate of torque development (ie, r = 0.597, P = 0.00309 and r = 0.551, P = 0.00849, respectively). No other significant correlations were found between voluntary and electrically evoked muscle contractile properties, including various measures of the torque-frequency relationship. Although there is some relationship between voluntary and NMES indices of muscle contractility, such results are only moderately well-correlated at best. The two techniques should therefore be considered complementary rather than interchangeable.

等速动力学测量和神经肌肉电刺激[NMES]通常用于评估肌肉收缩功能，但很少有研究调查两者之间的关系，特别是在女性中。因此，30名年轻女性（年龄23±5岁）在角速度为0.00-6.28 rad/s的等速测力仪上进行了最大膝关节伸展，之后使用股四头肌的NMES来确定未增强和增强的抽搐收缩特性以及扭矩-频率关系。自主等长峰值扭矩与峰值扭矩、绝对扭矩发展速率和增强抽搐期间绝对弛豫速率相关（r = 0.557、0.585和- 0.650，P分别= 0.00786、0.00411和0.000779）。自主等速峰值扭矩在1.57和3.14 rad/s时也与增强的绝对扭矩发展速率相关（分别为r = 0.597, P = 0.00309和r = 0.551, P = 0.00849）。在自愿和电诱发的肌肉收缩特性之间没有发现其他显著的相关性，包括扭矩-频率关系的各种测量。尽管自发性和NMES肌肉收缩指数之间存在一定的关系，但这些结果充其量只是适度的良好相关。因此，这两种技术应被认为是互补的，而不是可互换的。

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引用次数: 0

Neural control of human inspiratory muscles. What have we learnt from the study of single motor units? 人体吸气肌的神经控制。我们从单个运动单元的研究中学到了什么？

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-10 DOI: 10.1016/j.jelekin.2025.103026

Jane E. Butler , Simon C. Gandevia , Anna L. Hudson

This review covers the knowledge gains made about human respiratory neural drive resulting from ∼30 years of single motor unit recordings from human inspiratory muscles. Section 2 illustrates the non-uniformity of output across the various inspiratory motoneurone pools innervating diaphragm, scalene, intercostal, and genioglossus muscle activity during quiet breathing and during voluntary breathing. Section 3 describes the rostrocaudal graded timing and magnitude of respiratory neural drive across the parasternal intercostal and external intercostal muscles, which identified a principle of motoneurone recruitment termed the principle of neuromechanical matching that has been since identified as a principle of motor control more generally. Section 4 focuses on the changes in diaphragm motor unit discharge and morphology in ageing, chronic obstructive pulmonary disease and cervical spinal cord injury, linking increased drive to breathe to the changes in respiratory mechanics, with the intriguing findings that this is not always associated with a cortical contribution to breathing (i.e. change in the central control of breathing). Our studies have revealed an elaborate organisation of respiratory neural drive to the motoneurones to match the anatomical and functional complexity of the muscles themselves.

这篇综述涵盖了关于人类呼吸神经驱动的知识收获，这些知识来自于30年来对人类吸气肌单个运动单元的记录。第2节说明了在安静呼吸和自主呼吸时，支配横膈膜、斜角肌、肋间肌和颏舌肌活动的各种吸气运动神经元池输出的不均匀性。第3节描述了横过胸骨旁肋间肌和外肋间肌的呼吸神经驱动的背侧分级时间和大小，其中确定了运动神经元招募的原则，称为神经机械匹配原则，该原则已被确定为更普遍的运动控制原则。第4节着重于衰老、慢性阻塞性肺疾病和颈脊髓损伤中膈肌运动单元放电和形态学的变化，将呼吸驱动的增加与呼吸力学的变化联系起来，并发现这并不总是与皮层对呼吸的贡献（即呼吸中枢控制的变化）相关。我们的研究揭示了呼吸神经驱动到运动神经元的复杂组织，以匹配肌肉本身的解剖和功能复杂性。

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引用次数: 0

Impact of different ranges of motion in the prone barbell row on muscle excitation 俯卧杠铃排不同运动范围对肌肉兴奋的影响

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-06-09 DOI: 10.1016/j.jelekin.2025.103025

Josef Fischer , Christian Burger , Josefina Manieu Seguel , Coşkun Rodoplu , Florian Kurt Paternoster , Markus Tilp , Andreas Konrad

This study investigated muscle excitation via surface electromyography (sEMG) during different ranges of motion (ROMs) in the prone barbell row. Sixteen resistance-trained males performed a 10-repetition maximum (10RM) across three ROMs: full, upper half, and lower half. Time under tension was standardized at 2 s for both the concentric and eccentric phases. SEMG measurements were taken for the trapezius transversus (TT), rear deltoid (RD), latissimus dorsi (LD) and biceps brachii (BB). Mean sEMG amplitude and peak sEMG amplitude were analyzed. The LD showed significantly higher mean muscle excitation in the upper-half ROM compared to both the lower-half ROM (p < 0.001, d = − 0.59) and full ROM (p < 0.001, d = − 0.58). The TT exhibited significantly lower peak excitation in the upper-half ROM compared to the lower-half ROM (p = 0.042, d = 0.42) and full ROM (p = 0.013, d = 0.54). For the other muscles, no significant difference between the ROMs was found. The effect of ROM during the prone barbell row exercise on muscle excitation was of a medium magnitude only, as well as inconsistent, suggesting that ROM adjustments with standardized time under tension have limited impact on overall muscle activation.

本研究通过表面肌电图（sEMG）研究了俯卧杠铃行不同运动范围（ROMs）时的肌肉兴奋情况。16名受过阻力训练的男性在三个rom中进行了10次最大重复（10RM）：完整，上半部分和下半部分。在拉力下，同心相和偏心相的时间都标准化为2s。肌电图测量斜方肌横肌（TT）、后三角肌（RD）、背阔肌（LD）和肱二头肌（BB）。分析表面肌电信号平均振幅和峰值振幅。LD显示上半部分ROM的平均肌肉兴奋程度明显高于下半部分ROM (p <；0.001, d = - 0.59)和全ROM (p <；0.001, d =−0.58)。与下半部分ROM （p = 0.042, d = 0.42）和全ROM （p = 0.013, d = 0.54）相比，TT在上半部分ROM中表现出明显较低的峰值兴奋。对于其他肌肉，rom之间没有发现显著差异。俯卧杠铃排运动中ROM对肌肉兴奋的影响仅为中等程度，且不一致，这表明在紧张状态下以标准化时间调整ROM对整体肌肉激活的影响有限。

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引用次数: 0

Hamstring muscle shortens actively during the late swing phase of high-speed running 在高速跑的后期摇摆阶段，腘绳肌主动缩短

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-05-30 DOI: 10.1016/j.jelekin.2025.103022

Jun Hee Yoon , Iseul Jo , Yoon Hyung Cho , Kyeongtak Song , Hae-Dong Lee

The purpose of this study was to investigate the muscle–tendon unit (MTU) and fascicle behavior of the biceps femoris long head (BFlh) along with the activation during the swing phase of high-speed running. Nine active males ran on a treadmill at 70, 80, and 90 % of their maximum running speed. Kinematics of the hip and knee joints were collected during running. The fascicle length of the BFlh was monitored using a B-mode real-time ultrasound imaging system. Muscle activation of the BFlh was simultaneously recorded using surface electromyography. During the swing phase of running, the changes in the MTU length for 80 % and 90 % of the maximum running speed was greater than 70 % (p < 0.05). The fascicle was actively lengthened with weak activation during the early to the middle swing phase but actively shortened with strong activation during the late swing phase. Despite the different changes in the MTU length with increasing running speeds (p < 0.05), the fascicle length change was not different. During the late swing phase of high-speed running, the BFlh fascicle was actively shortened, suggesting further investigation explaining the cause of high-speed running-related muscle strain injury while considering the functional characteristics of the muscle–tendon interaction.

本研究的目的是研究高速跑步摇摆阶段股骨二头肌（BFlh）的肌肉-肌腱单元（MTU）和肌束行为。9只活跃的雄性在跑步机上以最大跑步速度的70%、80%和90%跑步。在跑步过程中收集髋关节和膝关节的运动学数据。采用b型实时超声成像系统监测BFlh束束长度。同时用表面肌电图记录BFlh的肌肉激活情况。在运行的摇摆阶段，最大运行速度的80%和90%时MTU长度的变化大于70% (p <；0.05)。在摇摆前期至中期，神经束呈弱激活的主动延长，而在摇摆后期，神经束呈强激活的主动缩短。尽管MTU长度随着运行速度的增加而变化(p <；0.05)，但束长变化无显著性差异。在高速跑的摇摆后期，BFlh束主动缩短，提示在考虑肌肉-肌腱相互作用的功能特征的同时，进一步研究解释高速跑相关肌肉劳损损伤的原因。

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引用次数: 0

Performance fatigability on a constant-load dynamic task is greater in females with moderate-severity Parkinson’s disease than healthy-aging controls 在恒定负荷动态任务中，表现疲劳在中度帕金森病的女性比健康衰老的对照组更大

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-05-26 DOI: 10.1016/j.jelekin.2025.103023

Avery Hinks , Pardeep Khangura , Elira Leake , Taylor Beedie , Muhammad M. Kathia , Sergiu-Gabriel Duplea , Leslie A. Witton , Barbara S. Connolly , Jamie F. Burr , Philip J. Millar , Geoffrey A. Power

Parkinson’s disease (PD) is a neurodegenerative disorder associated with self-reported fatigue. While fatigue is a disabling symptom, performance fatigability, a decline in strength or power during sustained tasks, remains poorly understood, particularly during isotonic (constant-load) contractions, which are encountered in everyday activities. We assessed performance fatigability and recovery in people with PD compared to healthy-aging controls. Fifteen females with PD and 14 healthy-aging controls underwent neuromuscular testing of knee extensors using dynamometry. Participants then performed repeated maximal-effort isotonic knee extensions at a 20 % maximum voluntary contraction (MVC) load until peak power declined 40 %. Performance fatigability was assessed by repetitions to task failure, with recovery tracked for 10 min afterwards. Despite no baseline differences in neuromuscular performance, PD achieved ∼58 % fewer repetitions to failure. Immediately post-task failure, compared to controls, PD exhibited less fatigue-induced impairments in MVC torque, voluntary activation, and quadriceps electromyographic (EMG) activity, but similar impairment of twitch torque. For power and twitch torque, PD and controls recovered similarly, whereas PD recovered sooner for MVC torque and quadriceps EMG. Isotonic performance fatigability differs subtly between PD and healthy controls, providing novel insights into the physical manifestations of fatigue in PD and potential implications for understanding disease progression and management.

帕金森病（PD）是一种与自我报告疲劳相关的神经退行性疾病。虽然疲劳是一种致残症状，但人们对运动疲劳，即在持续任务中力量或力量的下降，特别是在日常活动中遇到的等压（恒定负荷）收缩期间，仍然知之甚少。我们评估了PD患者的表现、疲劳和恢复情况，并将其与健康衰老对照组进行了比较。15名女性PD患者和14名健康的老年对照者采用测力法对膝关节伸肌进行神经肌肉测试。然后，参与者在20%的最大自愿收缩负荷（MVC）下重复进行最大努力等张力膝关节伸展，直到峰值功率下降40%。通过重复到任务失败来评估性能疲劳，并在10分钟后追踪恢复情况。尽管神经肌肉表现没有基线差异，但PD的失败重复次数减少了58%。任务失败后，与对照组相比，PD在MVC扭矩、自主激活和股四头肌肌电（EMG）活动方面表现出较少的疲劳引起的损伤，但在抽搐扭矩方面表现出类似的损伤。对于动力和抽搐扭矩，PD和控制恢复相似，而对于MVC扭矩和股四头肌肌电，PD恢复得更快。PD和健康对照之间的等渗性能疲劳有微妙的差异，为PD患者疲劳的生理表现提供了新的见解，并为理解疾病进展和管理提供了潜在的意义。

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引用次数: 0

The validity of surface electrodes to record latissimus dorsi activity during submaximal trunk movement and stability tasks 表面电极记录次极大躯干运动和稳定性任务时背阔肌活动的有效性

IF 2 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-05-10 DOI: 10.1016/j.jelekin.2025.103013

Declan Price , Karen A. Ginn , Mark Halaki , Victor Kwasi , Darren Reed

Introduction

The latissimus dorsi, a large superficial muscle connecting the pelvis, trunk and humerus, has the potential to contribute to trunk movement and stability. Surface electrodes are most typically used to record latissimus dorsi muscle activity during trunk tasks. However, there is the risk of crosstalk from nearby muscles, potentially leading to inaccurate muscle activity estimations. Therefore, this study aimed to determine the validity of using surface electrodes to record latissimus dorsi activity levels during submaximal trunk tasks by comparing the readings to indwelling electrodes simultaneously recorded at the same location.

Methods

Thirteen asymptomatic participants had indwelling electrodes inserted below the inferior angle of the scapula and surface electrodes placed over the same location. The participants completed submaximal trunk movements and stability tasks in various positions.

Results

There were no significant differences in latissimus dorsi activity recorded between surface and indwelling electrodes in all submaximal trunk movement tasks. However, during the trunk stability tasks the surface electrodes recorded significantly higher activity than the indwelling electrodes.

Conclusion

Surface electrodes are recommended as a valid option to record latissimus dorsi activity during submaximal trunk movement tasks. For tasks that challenge trunk stability, indwelling electrodes are recommended to avoid crosstalk from underlying muscles.

背阔肌是连接骨盆、躯干和肱骨的一块大的浅表肌肉，对躯干的运动和稳定性有潜在的帮助。表面电极最典型地用于记录躯干任务时背阔肌的活动。然而，有来自附近肌肉的串扰的风险，可能导致不准确的肌肉活动估计。因此，本研究旨在通过比较在同一位置同时记录的留置电极的读数，来确定在次极大躯干任务中使用表面电极记录背阔肌活动水平的有效性。方法13例无症状患者在肩胛骨下角下方置入留置电极，在同一位置置入表面电极。参与者完成了不同体位的躯干次极限运动和稳定性任务。结果在所有次大躯干运动任务中，表面电极和留置电极记录的背阔肌活动无显著差异。然而，在主干稳定任务中，表面电极记录的活性明显高于留置电极。结论体表电极是记录躯干次大运动任务时背阔肌活动的有效方法。对于挑战躯干稳定性的任务，建议留置电极以避免来自底层肌肉的串扰。

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