Journal of Electromyography and Kinesiology最新文献_第4页

Muscle coactivation during knee joint-position sense assessments: the effect of muscle fatigue and implications for the magnitude of errors and directional bias 膝关节位置感评估中的肌肉协同激活：肌肉疲劳的影响和误差和方向偏差的大小的含义

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-09-23 DOI: 10.1016/j.jelekin.2025.103072

Joana Azevedo , Pedro Fonseca , Adérito Seixas , José Oliveira , João Paulo Vilas-Boas

Purpose

This study aimed to describe muscle coactivation during knee joint-position sense (KJPS) assessments in healthy individuals, before and after muscle fatigue, and to analyse the implications for the magnitude of errors and directional bias.

Methods

The KJPS of 21 healthy males was assessed in the sitting position through concentric (SIT_CC) and eccentric repositionings (SIT_ECC) to 45° of knee flexion. Two fatigue protocols were tested, consisting of concentric contractions of the knee extensors or flexors. Muscle coactivation indices were calculated based on the normalized mean activation of the vastus lateralis and biceps femoris muscles. Absolute and relative errors were calculated to group participants by magnitude of errors (lower vs. higher errors) and directional bias (extension vs. flexion).

Results

Coactivation indices ranged between 74.92 % - 98.43 %. Significant overall decrease in coactivation indices after both fatigue protocols (p < 0.05). No significant differences in coactivation were found between magnitude of errors groups (p > 0.05), but significant higher coactivation were observed in participants failing the target position into flexion, only in the SIT_CC test (0.001 < p < 0.042).

Conclusion

Muscle coactivation between knee extensors and flexors was high in the assessed JPS tests, and decreased after fatigue. Muscle coactivation does not appear to explain the magnitude of errors, while it seems to influence directional bias.

目的本研究旨在描述健康个体在肌肉疲劳前后膝关节位置感（KJPS）评估过程中的肌肉协同激活，并分析误差大小和方向偏差的影响。方法21例健康男性，采用同心式（SIT_CC）和偏心式（SIT_ECC）膝关节屈曲45°的坐姿，评估KJPS。测试了两种疲劳方案，包括膝关节伸肌或屈肌的同心收缩。根据股外侧肌和股二头肌的归一化平均激活值计算肌肉共激活指数。计算绝对误差和相对误差，根据误差的大小（低误差vs高误差）和方向偏差（伸展vs屈曲）对参与者进行分组。结果活化指数在74.92% ~ 98.43%之间。两种疲劳方案后共活化指数总体显著下降（p < 0.05）。误差大小组之间的共激活没有显著差异（p > 0.05），但在未能完成目标体位屈曲的参与者中观察到显著更高的共激活，只有在SIT_CC测试中（0.001 < p < 0.042）。结论在JPS试验中，膝关节伸屈肌之间的肌肉协同激活程度较高，疲劳后肌肉协同激活程度降低。肌肉共激活似乎不能解释误差的大小，但它似乎影响方向偏差。

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引用次数: 0

The angle-based dynamic control ratio in isokinetic fatiguing knee flexion–extension effort: A study of healthy subjects 基于角度的等运动疲劳膝关节屈伸力动态控制率：健康受试者的研究。

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-09-11 DOI: 10.1016/j.jelekin.2025.103068

Kodai Suzuki , Takashi Okada , Takayoshi Hakkaku , Shohei Shimowada , Michal Katz-Leurer , Zeevi Dvir

This study examined the angle-based variations in the dynamic control ratio (DCRab), defined as the peak concentric moment of the quadriceps (Qcon) divided by its hamstring counterpart (Hecc) when calculated calculated at 1° intervals, during isokinetic fatiguing conditions. Sixteen men performed 30 maximal concentric knee extensions and eccentric flexions of the right and left knees at speeds of 120°/s and 180°/s. Data were analyzed using ratio values extracted from three repetition segments (4–6, 14–16, and 27–29) and presented graphically. All DCRab curves followed asymmetric second-order patterns, with the values near end-RoM (full extension: 5–7°) significantly higher than at RoM onset (95° of flexion), reflecting increased hamstring moment output. Fatigue reduced the Q and H moment at the equilibrium point [DCRe(M); Hecc = Qcon] and shifted the angle at which the DCRe occurred [DCRe(∠)] rightward, indicating altered muscle balance. DCRe(M) correlated with DCRe(∠): r = 0.84–0.90, while the DCRe(∠) correlated with angle of peak moment (r = 0.63–0.88), especially at 180°/s. Notably, the DCRe(∠) occurred at 20–30° of knee extension and correlated with the angle of peak moment of Hecc at 180°/s, indicating enhanced joint protection. No significant inter-limb differences were found in either Qcon or Hecc strength (p = 0.520). The use of the DCRab and its derivatives, the DCRe(M) and DCRe(∠) indicates that fatigue may affect Q-H balance. Thus, these parameters may aid in assessing the risk of knee injury and design of rehabilitation protocols.

本研究检查了动态控制比（DCRab）的角度变化，DCRab定义为四头肌（Qcon）的峰值同心力矩除以腿筋（Hecc），在等速疲劳条件下以1°间隔计算。16名男性以120°/s和180°/s的速度进行30次最大同心膝关节伸展和左右膝关节偏心屈曲。使用从3个重复片段（4-6、14-16和27-29）中提取的比率值对数据进行分析，并以图表形式呈现。所有DCRab曲线均呈非对称的二阶模式，近踝关节末端（完全伸展：5-7°）的值明显高于踝关节起始（屈曲95°），反映出腘绳肌力矩输出增加。疲劳降低了平衡点处的Q矩和H矩[DCRe(M)]；Hecc = Qcon]并将DCRe发生的角度[DCRe(∠)]向右移动，表明肌肉平衡发生了改变。DCRe(M)与DCRe（∠）的相关系数r = 0.84 ~ 0.90，而DCRe（∠）与峰值弯矩角的相关系数r = 0.63 ~ 0.88，尤其在180°/s处。值得注意的是，DCRe（∠）出现在膝关节伸展20 ~ 30°处，且与Hecc在180°/s处的峰值弯矩角度相关，说明关节保护作用增强。两组间Qcon和Hecc强度均无显著差异（p = 0.520）。DCRab及其衍生物dre (M)和dre（∠）的使用表明，疲劳可能会影响Q-H平衡。因此，这些参数可能有助于评估膝关节损伤的风险和设计康复方案。

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引用次数: 0

Methodological influences on tensor fascia latae EMG during dynamic tasks: Electrode- and normalisation-dependent variability 动态任务期间对阔筋膜张肌电图的方法学影响：电极和归一化依赖性变异性

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-10-24 DOI: 10.1016/j.jelekin.2025.103079

Manuela Besomi, Wolbert van den Hoorn, Bill Vicenzino, Paul W. Hodges

Electromyographic (EMG) recordings of the tensor fascia latae (TFL) muscle are commonly used to assess muscle activation, yet electrode type and amplitude normalisation method can influence data interpretation. This study compared surface and fine-wire EMG recordings of the TFL during dynamic step-up and step-down tasks, and examined the effect of three amplitude normalisation methods on the TFL EMG patterns: maximum voluntary isometric contraction (MVIC), peak of the mean from average across task trials, and peak of the individual trial peaks. Eight physically active participants (5 females, 3 males) performed five trials of each task with EMG recorded from the dominant leg. Two participants were excluded due to artefact contamination or absent fine-wire signals. Surface EMG demonstrated higher early activation during the step-up task compared to fine-wire EMG (p = 0.013); a difference likely attributable to crosstalk from adjacent muscles. Normalisation methods also altered the timing (time of onset) of ensemble waveforms and between-participant variability, with MVIC introducing greater variability but preserving physiological meaning, while task-based methods reduced variability but removed amplitude information. These findings highlight the contradictory results and limitations of both surface and fine-wire EMG when applied in isolation to the TFL. Rather than endorsing one technique as superior, this study provides a tutorial regarding how methodological choices can shape interpretation and potentially lead to misleading conclusions. Future studies incorporating intra-subject variability testing and high-density surface EMG are needed to optimise electrode placement and improve methodological reliability when studying small, anatomically complex muscles such as the TFL.

阔筋膜张肌（TFL）的肌电图（EMG）记录通常用于评估肌肉激活，但电极类型和振幅归一化方法会影响数据解释。本研究比较了动态升压和降压任务时TFL的表面肌电和细线肌电记录，并检查了三种振幅标准化方法对TFL肌电模式的影响：最大自主等长收缩（MVIC）、跨任务试验的平均峰值和单个试验峰值。8名身体活跃的参与者（5名女性，3名男性）对每项任务进行了5次试验，并记录了主腿的肌电图。由于人工污染或缺少细线信号，两名参与者被排除在外。与细丝肌电图相比，表面肌电图在加速任务中表现出更高的早期激活（p = 0.013）；一种可能归因于相邻肌肉的相互作用的差异。归一化方法也改变了集合波形的时间（开始时间）和参与者之间的可变性，其中MVIC引入了更大的可变性，但保留了生理意义，而基于任务的方法减少了可变性，但去除了幅度信息。这些发现强调了表面肌电和细线肌电在单独应用于TFL时的矛盾结果和局限性。本研究并没有认可一种技术是优越的，而是提供了一个关于方法选择如何影响解释并可能导致误导性结论的教程。未来的研究需要结合受试者内部变异性测试和高密度表面肌电图来优化电极放置，并在研究小的、解剖复杂的肌肉（如TFL）时提高方法的可靠性。

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引用次数: 0

Bilateral activation failure of ankle dorsiflexors in patients with hip osteoarthritis undergoing total hip arthroplasty 全髋关节置换术中髋关节骨性关节炎患者双侧踝关节背屈肌激活失败。

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.jelekin.2025.103084

Federico Temporiti , Paola Adamo , Francesco Baldracco , Andrea Tarasconi , Davide De Leo , Arianna Colpani , Nicola Maffiuletti , Roberto Gatti

The study aimed at investigating voluntary activation of ankle dorsiflexors in patients with hip osteoarthritis before and after total hip arthroplasty (THA). Twenty-six subjects with unilateral end-stage hip osteoarthritis were assessed for voluntary activation level (VAL) of ankle dorsiflexors of operative and non-operative sides using twitch interpolation technique. Maximal isometric force (MVIC), intrinsic electrically-evoked force (EF) and rate of force development (RFD) at 50 ms, 100 ms and 200 ms during voluntary contractions were also collected. Patients were assessed on the preoperative and third postoperative days and data were compared to 26 age-matched healthy subjects. Patients revealed lower VAL (before surgery: MD 7.7 %, CI₉₅ 0.4, 14.9; after surgery: MD 12.4 %; CI₉₅ 5.5, 19.2), MVIC, EF and RFD than healthy subjects on the operative side. On the nonoperative side, patients revealed lower postoperative VAL than healthy subjects (MD 9.0 %, CI₉₅ 2.4, 15.6) as well as lower evoked force and RFD before and after surgery. Bilateral activation failure of ankle dorsiflexors was found in patients undergoing THA. Such impairments were accompanied by deficits in maximal, evoked and explosive force. These findings confirmed impairments in neuromuscular function of muscles that do not surround the affected joint and may depend on supraspinal pathophysiological mechanisms and learned non-use.

该研究旨在调查髋关节骨性关节炎患者在全髋关节置换术（THA）前后踝关节背屈肌的自主激活。采用抽动插值法对26例单侧终末期髋关节骨性关节炎患者手术侧和非手术侧踝关节背屈肌的自主激活水平（VAL）进行评估。采集自发性收缩时50 ms、100 ms和200 ms时的最大等距力（MVIC）、内在电诱发力（EF）和力发展率（RFD）。术前和术后第三天对患者进行评估，并将数据与26名年龄匹配的健康受试者进行比较。患者术侧VAL（术前：MD 7.7%, CI95 0.4, 14.9；术后：MD 12.4%, CI95 5.5, 19.2）、MVIC、EF、RFD均低于健康者。在非手术侧，患者术后VAL低于健康者（MD为9.0%，CI95为2.4,15.6%），且术前和术后诱发力和RFD均较低。在THA患者中发现双侧踝关节背屈肌激活失败。这些损伤伴随着最大、诱发力和爆发力的缺陷。这些发现证实了不围绕受影响关节的肌肉的神经肌肉功能受损，可能取决于椎上病理生理机制和习得性不使用。

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引用次数: 0

Automatic detection of swallowing events based on surface electromyography 基于表面肌电图的吞咽事件自动检测

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.jelekin.2025.103081

Juan Salvador Mercado-Villegas , Juan Rafael Orozco-Arroyave , Andres Orozco-Duque , Sebastian Roldan-Vasco

Clinical evaluation of dysphagia requires modeling different phases of swallowing. This process is expensive, invasive, subjective, and typically based on Videofluoroscopic Swallowing Study (VFSS) studies. This work evaluates the use of surface electromyography (sEMG) signals for detecting bolus passage through the mandible line (ManL) and upper esophageal sphincter (UES) in patients with oropharyngeal dysphagia. The paper introduces a novel method where GRU networks are fed with spectrograms resulting from processing sEMG signals. Using VFSS as the gold standard, our results yielded F1 scores up to 96% for binary, and 80% for tri-class classifications, outperforming state-of-the-art methods. The detection was more accurate with larger volumes and thinner consistencies. These results indicate that sEMG is a promising biosignal especially because of its non-invasiveness nature, making it an ideal complement to VFSS for dysphagia diagnosis and monitoring.

吞咽困难的临床评估需要模拟吞咽的不同阶段。这个过程是昂贵的，侵入性的，主观的，通常是基于视频透视吞咽研究（VFSS）的研究。本研究评估了表面肌电图（sEMG）信号在口咽吞咽困难患者中检测药物通过下颌骨线（ManL）和上食管括约肌（UES）的应用。本文介绍了一种将表面肌电信号处理后的频谱图馈入GRU网络的新方法。使用VFSS作为金标准，我们的结果在二元分类中获得了高达96%的F1分数，在三类分类中获得了80%的F1分数，优于最先进的方法。体积越大，浓度越薄，检测越准确。这些结果表明，肌电图是一种很有前途的生物信号，特别是因为它的非侵入性，使它成为VFSS诊断和监测吞咽困难的理想补充。

引用次数: 0

Shoulder muscle activity magnitude and timing in individuals with specific scapular movement patterns 特定肩胛骨运动模式个体的肩部肌肉活动幅度和时间

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1016/j.jelekin.2025.103054

Gaura Saini , Madeline Goodson , Paula M. Ludewig

Relationships between specific muscle activity alterations and specific scapular motion patterns have not been well established. The purpose of this study was to identify muscle activation magnitude and timing in two specific scapular movement groups (excessive scapular anterior tilt, scapular lateralization). Surface electromyography (EMG) was captured simultaneously with biplane video radiography and optical motion capture during two repetitions each of shoulder flexion, abduction, and unrestricted overhead reaching in 45 adults with shoulder pain. The following muscle activation magnitudes measured with EMG were assessed individually and in ratios: lower trapezius (LT), serratus anterior (SA), upper trapezius (UT), anterior deltoid (AD), and middle deltoid (MD). The timing of each muscle’s initiation was calculated as a percent of humerothoracic range of motion. For EMG magnitude, significant interactions including group were found for AD, LT/SA, and LT/AD. Findings suggest a relative reduction of SA in both groups in the constrained motions compared to the self-selected motion and a reduction in LT in the lateralization group in early motion. For EMG timing, no group effects were significant, however findings suggest delays in SA and LT activation in both groups. The findings provide evidence that individuals with different scapular movement patterns may have distinct muscle activity patterns which can inform patient-specific rehabilitation interventions.

特定肌肉活动改变与特定肩胛骨运动模式之间的关系尚未得到很好的确立。本研究的目的是确定两种特定肩胛骨运动组（肩胛骨过度前倾和肩胛骨偏侧）的肌肉激活程度和时间。对45例肩关节疼痛的成年人进行两次重复的肩部屈曲、外展和不受限制的头顶伸展运动，同时用双翼视频x线摄影和光学运动捕捉捕捉体表肌电图（EMG）。以下肌电图测量的肌肉激活幅度分别按比例进行评估：下斜方肌（LT）、前锯肌（SA）、上斜方肌（UT）、前三角肌（AD）和中三角肌（MD）。每块肌肉开始运动的时间是用胸骨活动度的百分比来计算的。对于肌电图，AD、LT/SA和LT/AD的显著相互作用包括组。研究结果表明，与自我选择运动相比，两组在受限运动中SA相对减少，而侧化组在早期运动中LT减少。对于肌电时间，没有明显的组效应，但研究结果表明两组的SA和LT激活延迟。研究结果表明，不同肩胛骨运动模式的个体可能有不同的肌肉活动模式，这可以为患者特定的康复干预提供信息。

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引用次数: 0

Three-dimensional markerless pose estimation for anatomical landmarks of the shoulder and upper limb 肩部和上肢解剖标志的三维无标记姿态估计

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-09-10 DOI: 10.1016/j.jelekin.2025.103067

F. Lefebvre , I. Rogowski , N. Long , Y. Blache

This study aimed to develop and validate a 3D markerless pose estimation algorithm for anatomical landmarks of the shoulder and upper limb. Twenty-six healthy participants were asked to hold 21 static positions, while both markerless and marker-based (applied after palpation) images were recorded using eight video cameras. A pre-trained convolutional neural network based on ResNet-50 was fine-tuned on 2612 markerless images to estimate the poses of 20 anatomical landmarks. The model was tested on 1 680 images by calculating the 3D Euclidean distances between predicted coordinates and those labeled from marker-based images. Across all positions, median and 90th percentile Euclidean distances were below 15 mm and 30 mm, respectively for all anatomical landmarks, except for the 8th thoracic vertebra, inferior angle of the scapula and medial epicondyle, which presented the highest Euclidean distances. For most of the anatomical landmarks, loss rates inferior to 6 % were observed for predicted coordinates. The neural network accuracy was similar between movements tested and not influenced by the degree of arm elevation. To conclude, a neural network was developed and validated for estimating shoulder and upper-limb anatomical landmarks poses, demonstrating promising accuracy for future clinical applications.

本研究旨在开发和验证一种用于肩部和上肢解剖标志的三维无标记姿态估计算法。26名健康参与者被要求保持21个静态姿势，同时使用8台摄像机记录无标记和基于标记（触诊后应用）的图像。基于ResNet-50的预训练卷积神经网络对2612张无标记图像进行微调，估计出20个解剖标志的姿态。通过计算预测坐标与基于标记的图像标记坐标之间的三维欧氏距离，在1680幅图像上对该模型进行了测试。在所有体位中，除第8胸椎、肩胛骨下角和内上髁的欧氏距离最大外，所有解剖标志的中位数和第90百分位欧氏距离分别小于15 mm和30 mm。对于大多数解剖标志，预测坐标的损失率低于6%。神经网络的准确性在测试的运动之间是相似的，并且不受手臂抬高程度的影响。综上所述，我们开发并验证了一个神经网络用于估计肩部和上肢解剖标志姿势，为未来的临床应用展示了良好的准确性。

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引用次数: 0

Relationship between changes in neuromuscular factors and disability outcomes following a resistance exercise intervention in rotator cuff tendinopathy 肩袖肌腱病抗阻运动干预后神经肌肉因子变化与残疾结局的关系

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-10-18 DOI: 10.1016/j.jelekin.2025.103075

Oscar Vila-Dieguez , Daniel McPherson , George Salem , Clark R. Dickerson , Andrew R. Karduna , Lori A. Michener

Background

Exercise is a first-line treatment for rotator cuff (RC) tendinopathy, but responses are variable. Defining mechanisms underlying patient improvement is necessary. This study investigated the relationship between neuromuscular factors—specifically peak force, rate of force development (RFD), and muscle activation onset—and patient-reported disability outcomes during an 8-week resistance exercise program.

Methods

51 participants with RC tendinopathy underwent assessments of peak force, RFD, and EMG muscle activation onset at baseline, 2, 4, and 8 weeks. Penn Shoulder Score measured patient-reported disability. Linear mixed-effects models assessed changes over time and the association between variables.

Results

Penn scores improved from baseline through weeks 2, 4, and 8. RFD increased in external rotation and abduction and peak force in external rotation and earlier EMG onset of deltoid and RC muscles. Baseline Penn score, increase in isometric abduction peak force from week 0 to week 2 and from week 2 to week 4 were associated with improved disability outcomes after controlling for pain during the task.

Conclusion

Several force and muscle activation variables changed after the exercise intervention, but only abduction peak force was related to patient-reported disability outcomes. This may offer added insight into individual recovery mechanisms beyond patient-reported outcomes alone.

背景：运动是肩袖（RC）肌腱病变的一线治疗方法，但疗效不一。确定患者改善的机制是必要的。本研究调查了在为期8周的阻力运动项目中，神经肌肉因素——特别是峰值力、力发展率（RFD）和肌肉激活发作——与患者报告的残疾结果之间的关系。方法：51名患有RC肌腱病变的参与者在基线、2周、4周和8周时接受了峰值力、RFD和肌电图肌肉激活发作的评估。Penn肩部评分测量患者报告的残疾。线性混合效应模型评估了随时间的变化和变量之间的关联。结果：Penn评分从基线到第2、4和8周均有所改善。RFD增加了外旋和外展，增加了外旋的峰值力，三角肌和RC肌的肌电图开始时间提前。基线Penn评分，从第0周到第2周以及从第2周到第4周的等长外展峰值力的增加与任务期间疼痛控制后残疾结果的改善有关。结论：运动干预后，一些力量和肌肉激活变量发生了变化，但只有外展峰值力与患者报告的残疾结局有关。这可能为个体恢复机制提供更多的见解，而不仅仅是患者报告的结果。

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引用次数: 0

Motor performance and aging in males and females 男性和女性的运动表现和衰老

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-09-18 DOI: 10.1016/j.jelekin.2025.103066

Sandra K. Hunter

Advanced aging is accompanied by marked declines in motor performance in males and females including reductions in strength, speed and power of limb muscles that begin as early as midlife (∼>40 years) and accelerate from ∼65 years of age. Low muscle power and strength is exacerbated by increased fatigability with aging of limb muscles during dynamic contraction tasks and larger performance variability (between and within older adults), especially in older females. Starting in midlife, females exhibit earlier and larger age-related reductions in muscle strength and power and athletic performance than males of the same age and this is paralleled by increased prevalence of poor health, frailty, and loss of independence. This review presents evidence of key neural and muscular mechanisms affecting the motor unit, the age-related reductions in motor performance and the increased variability in healthy old and very old males and females. Muscular atrophy, particularly of fast-twitch (Type II) fibers, contractile slowing, degradation of neuromuscular junctions, and impairments in motor unit activation collectively underpin sarcopenia and impaired motor and functional performance among older adults. This review also briefly highlights approaches to understanding the protective effects of physical activity and high-resistance training on the age-related changes in muscle and neural function, even in the oldest adults. Such interventions delay functional declines and emphasize the adaptability of the aging neuromuscular system. Opportunities abound for future research to focus on understanding the specific mechanisms driving neural and muscular degeneration and optimizing exercise strategies to improve neuromuscular health of old males and females.

老年化伴随着男性和女性运动能力的显著下降，包括肢体肌肉的力量、速度和力量的下降，这种下降早在中年（40岁）就开始了，从65岁开始加速。在动态收缩任务中，肢体肌肉的老化和更大的表现变异性（老年人之间和老年人内部），特别是老年女性，会增加疲劳，从而加剧肌肉力量和力量的低下。从中年开始，与同龄男性相比，女性在肌肉力量、力量和运动表现方面表现出更早、更大的与年龄相关的下降，与此同时，健康状况不佳、身体虚弱和丧失独立性的情况也越来越普遍。这篇综述提供了影响运动单元的关键神经和肌肉机制的证据，在健康的老年和高龄男性和女性中，与年龄相关的运动性能下降和变异性增加。肌肉萎缩，特别是快速抽搐（II型）纤维，收缩减慢，神经肌肉连接退化和运动单元激活损伤共同构成老年人肌肉减少症和运动和功能表现受损的基础。这篇综述还简要地强调了理解体育活动和高阻力训练对肌肉和神经功能的年龄相关变化的保护作用的方法，即使在老年人中也是如此。这样的干预延缓功能衰退，并强调老化的神经肌肉系统的适应性。未来研究的重点是了解驱动神经和肌肉退化的具体机制，优化运动策略，以改善老年男性和女性的神经肌肉健康。

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引用次数: 0

Effects of peripheral fatigue of ankle evertors on force sense and electromyographic activity in healthy subjects 踝关节外周疲劳对健康受试者力感和肌电活动的影响。

IF 2.3 4区医学 Q3 NEUROSCIENCES

Journal of Electromyography and Kinesiology

Pub Date : 2025-12-01 Epub Date: 2025-11-05 DOI: 10.1016/j.jelekin.2025.103083

Tjaž BREZOVAR , Maja VENE , Taja TUČEN , Anika JAGARINEC , Urška PUH , Alan KACIN

Background

Ankle proprioception is essential for dynamic stability, but fatigue may impair force sense and neuromuscular control, increasing injury risk. Their relationship remains unclear. Objective: To examine the effects of ankle evertor fatigue on force sense accuracy and variability, along with associated changes in muscle activation. Methods: Twenty-four healthy participants completed a force-matching task in ankle eversion at 25% and 50% of MVIC before and after a fatigue protocol. Force sense was assessed by constant, absolute, and variable error and coefficient of variation. RMS amplitude was calculated for the peroneus longus, tibialis anterior, soleus, and gastrocnemius medialis, and median frequency only for the peroneus longus. Results: With fatigue, there was a 34.7% reduction in MVIC torque (p < 0.05). During force-matching tasks, variable error at 50% MVIC and coefficient of variation without visual feedback at 25% and 50% MVIC increased (p < 0.01), EMG amplitude of all muscles substantially increased (p < 0.05), and median frequency of the peroneus longus decreased (p < 0.001). Conclusion: Peripheral fatigue of ankle evertors increases variability in muscle force output, which is accompanied by compensatory motor unit recruitment during force matching, resulting in elevated variability.

背景：踝关节本体感觉对动态稳定性至关重要，但疲劳可能损害力感和神经肌肉控制，增加损伤风险。他们的关系尚不清楚。目的：探讨踝关节旋转疲劳对力感准确性和变异性的影响，以及与之相关的肌肉激活变化。方法：24名健康参与者在疲劳方案前后分别以25%和50%的MVIC完成踝关节外翻力匹配任务。力感通过恒定、绝对和可变误差和变异系数进行评估。计算腓骨长肌、胫骨前肌、比目鱼肌和腓肠肌内侧肌的均方根振幅，仅计算腓骨长肌的中位数频率。结果：在疲劳状态下，MVIC扭矩降低34.7% (p)。结论：踝关节外周性疲劳增加了肌肉力量输出的变异性，这伴随着力量匹配过程中代偿运动单位的补充，导致变异性升高。

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引用次数: 0