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Tutorial: Analysis of central and peripheral motor unit properties from decomposed High-Density surface EMG signals with openhdemg 教程:从高密度表面肌电信号分解中分析中央和外周运动单元的特性
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-30 DOI: 10.1016/j.jelekin.2023.102850
Giacomo Valli , Paul Ritsche , Andrea Casolo , Francesco Negro , Giuseppe De Vito

High-Density surface Electromyography (HD-sEMG) is the most established technique for the non-invasive analysis of single motor unit (MU) activity in humans. It provides the possibility to study the central properties (e.g., discharge rate) of large populations of MUs by analysis of their firing pattern. Additionally, by spike-triggered averaging, peripheral properties such as MUs conduction velocity can be estimated over adjacent regions of the muscles and single MUs can be tracked across different recording sessions. In this tutorial, we guide the reader through the investigation of MUs properties from decomposed HD-sEMG recordings by providing both the theoretical knowledge and practical tools necessary to perform the analyses. The practical application of this tutorial is based on openhdemg, a free and open-source community-based framework for the automated analysis of MUs properties built on Python 3 and composed of different modules for HD-sEMG data handling, visualisation, editing, and analysis. openhdemg is interfaceable with most of the available recording software, equipment or decomposition techniques, and all the built-in functions are easily adaptable to different experimental needs. The framework also includes a graphical user interface which enables users with limited coding skills to perform a robust and reliable analysis of MUs properties without coding.

高密度表面肌电图(HD-sEMG)是最成熟的无创分析人类单运动单元(MU)活动的技术。它提供了一种可能性,通过分析它们的放电模式来研究大量微原子的中心特性(例如放电速率)。此外,通过峰值触发平均,可以估计相邻肌肉区域的微动电位传导速度等周边特性,并且可以在不同的记录过程中跟踪单个微动电位。在本教程中,我们通过提供执行分析所需的理论知识和实用工具,指导读者从分解的HD-sEMG记录中调查MUs属性。本教程的实际应用基于opendemg,这是一个基于Python 3的免费开源社区框架,用于自动分析MUs属性,并由用于HD-sEMG数据处理,可视化,编辑和分析的不同模块组成。Openhdemg可与大多数可用的记录软件,设备或分解技术接口,所有内置功能都很容易适应不同的实验需求。该框架还包括一个图形用户界面,使编码技能有限的用户能够在不编码的情况下对mu属性进行稳健可靠的分析。
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引用次数: 0
Falling decreased anterior cruciate ligament loading variables during single-leg landings after mid-flight external trunk perturbation 飞行中躯干外部扰动后单腿着陆时,坠落减少前十字韧带负荷变量
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-30 DOI: 10.1016/j.jelekin.2023.102849
Yu Song , Ling Li , Jacob Layer , Gerwyn Hughes , Derek Smith , Margaret Wilson , Qin Zhu , Boyi Dai

Mid-flight external upper-trunk perturbation is associated with increased anterior cruciate ligament (ACL) injury risk during landing. This study aimed to assess the effect of natural, soft, and falling landing techniques on knee mechanics and vertical ground reaction forces (VGRF) during single-leg landings with/without mid-flight medial–lateral external upper-trunk pushing perturbation. Twenty-eight participants performed single-leg landings using the three landing techniques with/without mid-flight pushing perturbation. The perturbation was created by a customized apparatus releasing a slam ball and pushing the participants near the peak jump height at the upper trunk. Perturbation resulted in significantly greater lateral trunk bending angles, knee flexion angles at initial contact, peak knee abduction angles, and peak knee adduction moments compared to no perturbation. The falling condition significantly demonstrated the greatest lateral trunk bending angles, knee flexion angles, and peak knee external rotation moments and the smallest peak knee abduction angles, peak VGRF, and peak knee extension moments compared to natural/soft landings regardless of perturbation conditions. Mid-flight external perturbation resulted in variables associated with greater ACL loading during single-leg landings. Falling demonstrated variables associated with smaller ACL loading, particularly for perturbation conditions. Incorporating falling techniques into jump-landing training programs may guide players to safely fall on the ground when perturbation occurs. Falling provides an alternative strategy to potentially decrease indirect contact ACL injury risk when the sports environment allows.

飞行中上躯干外摄动与着陆时前交叉韧带(ACL)风险增加有关。本研究旨在评估自然、柔软和下落着地技术对膝关节力学和垂直地面反作用力(VGRF)的影响,在单腿着地时,有/没有飞行中内侧-外侧外上肢推力扰动。28名参与者使用三种着陆技术进行单腿着陆,有/没有飞行中推力扰动。扰动是由一个定制的装置产生的,该装置释放一个扣球,并将参与者推到上躯干的最高跳高附近。与无扰动相比,扰动导致躯干外侧弯曲角、初始接触时膝关节屈曲角、膝关节外展角峰值和膝关节内收力矩峰值显著增大。与自然/软着陆相比,无论在何种扰动条件下,下降状态下的躯干外侧弯曲角、膝关节屈曲角和膝关节外旋力矩峰值最大,膝关节外展角、VGRF峰值和膝关节伸展力矩峰值最小。在单腿着陆时,飞行中的外部扰动导致与更大的ACL负荷相关的变量。下降表明变量与较小的ACL负载相关,特别是在扰动条件下。将落地技术纳入起跳落地训练计划中,可以指导运动员在发生扰动时安全落地。当运动环境允许时,摔倒提供了一种潜在的降低间接接触性ACL损伤风险的替代策略。
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引用次数: 0
High-density surface electromyography allows to identify risk conditions and people with and without low back pain during fatiguing frequency-dependent lifting activities 高密度表面肌电图可以识别疲劳频率相关的举重活动中的风险状况以及有或没有腰痛的人。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-04 DOI: 10.1016/j.jelekin.2023.102839
Tiwana Varrecchia , Alberto Ranavolo , Giorgia Chini , Alessandro Marco De Nunzio , Francesco Draicchio , Eduardo Martinez-Valdes , Deborah Falla , Silvia Conforto

Low back pain (LBP) is a leading cause of disability in the workplace, often caused by manually lifting of heavy loads. Instrumental-based assessment tools are used to quantitatively assess the biomechanical risk of lifting activities. This study aims to verify that, during the execution of fatiguing frequency-dependent lifting, high-density surface electromyography (HDsEMG) allows the discrimination of healthy controls (HC) versus people with LBP and biomechanical risk levels. Fifteen HC and eight people with LBP performed three lifting tasks with a progressively increasing lifting index, each lasting 15 min. Erector spinae (ES) activity was recorded using HDsEMG and amplitude parameters were calculated to characterize the spatial distribution of muscle activity. LBP group showed a less ES activity than HC (lower root mean square across the grid and of the activation region) and an involvement of the same muscular area across the task (lower coefficient of variation of the center of gravity of muscle activity). The results indicate the usefulness of HDsEMG parameters to classify risk levels for both HC and LBP groups and to determine differences between them. The findings suggest that the use of HDsEMG could expand the capabilities of existing instrumental-based tools for biomechanical risk classification during lifting activities.

腰痛(LBP)是工作场所残疾的主要原因,通常由手动举起重物引起。基于仪器的评估工具用于定量评估举重活动的生物力学风险。本研究旨在验证,在执行疲劳频率依赖性举重过程中,高密度表面肌电图(HDsEMG)可以区分健康对照组(HC)与患有LBP和生物力学风险水平的人。15名HC和8名LBP患者执行了三项提升任务,提升指数逐渐增加,每次持续15分钟。使用HDsEMG记录勃起棘(ES)活动,并计算振幅参数来表征肌肉活动的空间分布。LBP组的ES活性低于HC(整个网格和激活区域的均方根较低),并且在整个任务中涉及相同的肌肉区域(肌肉活动重心的变化系数较低)。结果表明,HDsEMG参数对HC和LBP组的风险水平进行分类并确定它们之间的差异是有用的。研究结果表明,HDsEMG的使用可以扩展现有基于工具的工具在举重活动中进行生物力学风险分类的能力。
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引用次数: 0
Fatigue task-dependent effect on spatial distribution of lumbar muscles activity 疲劳任务依赖性对腰肌活动空间分布的影响。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-04 DOI: 10.1016/j.jelekin.2023.102837
Emile Marineau-Bélanger , Martin Vaurs , Justin Roy , Julie O'Shaughnessy , Martin Descarreaux , Jacques Abboud

This study aims to identify how spatial distribution of lumbar muscle activity is modulated by different fatigue tasks. Twenty healthy adults performed two different isometric trunk extension endurance tasks (the modified Sorensen test and the inverted modified Sorensen test) until exhaustion. During these tasks, bilateral superficial lumbar muscle activity was recorded using high-density electromyography. The spatial distribution of activation within these muscles was obtained using the centroid coordinates in the medio-lateral and cranio-caudal directions. The effects of task and endurance time (left and right sides) were investigated using repeated measures ANOVA. Results revealed a significant lateral shift of the centroid throughout the fatigue tasks on both sides and no difference between tasks. Significant task × time interaction effects were found for the cranio-caudal direction on both sides showing a significantly more caudal location of the centroid in the modified Sorensen test compared to the inverted test at the beginning of the tasks. Our findings suggest that spatial distribution of lumbar muscle activity is task-dependent in a pre-fatigue stage while an alternative but similar muscle recruitment strategy is used in both tasks to maintain performance in the later stages of muscle fatigue.

本研究旨在确定不同的疲劳任务如何调节腰肌活动的空间分布。20名健康成人进行两种不同的躯干伸展耐力任务(改良Sorensen试验和倒置改良Sorensen试验),直到筋疲力尽。在这些任务中,用高密度肌电图记录双侧浅表腰肌活动。利用中外侧和颅尾方向的质心坐标获得了这些肌肉内激活的空间分布。使用重复测量方差分析(repeated measures ANOVA)研究任务时间和耐力时间(左右两侧)的影响。结果显示,在整个疲劳任务中,两侧的质心有显著的横向移动,任务之间没有差异。在双侧颅尾方向上发现了显著的任务×时间交互效应,在任务开始时,改进Sorensen测试的质心在尾侧的位置明显高于反向测试。我们的研究结果表明,在疲劳前阶段,腰肌活动的空间分布是任务依赖的,而在肌肉疲劳的后期阶段,两种任务都使用了另一种相似的肌肉招募策略来维持表现。
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引用次数: 0
Fatigability of the thenar muscles using electrical nerve stimulation with fixed stimuli count, while varying the frequency and duty cycle 使用固定刺激次数的神经电刺激,同时改变频率和占空比,研究大鱼际肌肉的疲劳
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-04 DOI: 10.1016/j.jelekin.2023.102838
A. Gkesou , A. Papavasileiou , S. Karagiaridis , T. Kannas , I.G. Amiridis , V. Hatzitaki , D.A. Patikas

Our aim was to compare three electrical stimulation protocols (P20, P30 and P40), with the same number of stimuli, but different stimulation frequencies (20, 30 and 40 Hz, respectively) and duty cycles [1.2:1.2 s (continuous), 0.8:1.2 s (intermittent) and 0.6:1.2 s (intermittent), respectively). Twitch force and the peak-to-peak M-wave amplitude of the thenar muscles were measured before, during and after each protocol at 1–40 Hz in random order. Twelve healthy adults (23–41 years old) were examined for each protocol in random order and in separate sessions. P20 elicited the highest mean force, and P40 the lowest decrease in percent force at the end of the protocol. Force evoked at 1 and 10 Hz decreased less after P40, compared with P20 and P30. The M-wave amplitude was significantly reduced throughout all protocols, with the largest decrease observed during P30. Although an increase in frequency typically induced earlier and greater decrement in force, this was compensated or even reversed by increasing the interval between each stimulation train, while keeping the number of pulses per stimulation cycle constant. The lesser decrease in M-wave amplitude during P40 compared with P20 indicates that longer between-train intervals may help maintaining the integrity of neuromuscular propagation.

我们的目的是比较三种电刺激方案(P20、P30和P40),它们具有相同的刺激次数,但刺激频率(分别为20、30和40 Hz)和占空比[分别为1.2:1.2 s(连续)、0.8:1.2 s(间歇)和0.6:1.2 s(间歇)]不同。在1-40 Hz的频率下,按随机顺序测量每次治疗前、治疗中和治疗后大鱼际肌肉的抽动力和m波峰对峰振幅。12名健康成人(23-41岁)按随机顺序在单独的会议中对每个方案进行检查。实验结束时,P20的平均力最大,P40的平均力百分比下降最小。与P20和P30相比,P40后1和10 Hz诱发的力减少较少。在所有方案中,m波振幅都显著降低,在P30期间观察到最大的下降。虽然频率的增加通常会导致更早和更大的力衰减,但通过增加每个刺激序列之间的间隔,同时保持每个刺激周期的脉冲数不变,可以补偿甚至逆转这种衰减。与P20相比,P40期间m波振幅的下降幅度较小,这表明较长的训练间隔可能有助于维持神经肌肉传播的完整性。
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引用次数: 0
The effect of prolonged walking on leg muscle activity patterns and vulnerability to perturbations 长时间步行对腿部肌肉活动模式和对扰动的脆弱性的影响
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-11-04 DOI: 10.1016/j.jelekin.2023.102836
Yujin Kwon , Lillian K. Chilton , Hoon Kim , Jason R. Franz

Understanding the consequences and ecological relevance of muscle fatigue is important to guide the development of strategies to preserve independence. However, few studies have examined walking-related fatigue and the effects on walking instability. Our purpose was to investigate the effects of prolonged walking on leg muscle activity and vulnerability to balance perturbations. Eighteen healthy young adults completed a 30-min walking trial at their preferred walking speed while leg muscle activities were recorded. Before and after the 30-min walk, participants responded to five 5% body weight lateral force perturbations. Time-frequency analysis with wavelet transformation and principal component analyses assessed neuromuscular adaptations of muscles to prolonged walking. Following prolonged walking, we observed a time-dependent increase in EMG intensities at slower frequencies for the soleus and tibialis anterior and a decrease in mean amplitudes for the soleus, lateral gastrocnemius, and semitendinosus. Mean mediolateral CoM displacement following perturbations averaged 21% larger after the 30-min walk. Our results suggest that walking for 30 min at a comfortable speed elicits complex neuromuscular adaptations indicative of local muscle fatigue and an increased vulnerability to walking balance perturbations. These findings could inform fatigue monitoring systems or walking assistive devices aimed at reducing walking-related fatigue and maintaining independent mobility.

了解肌肉疲劳的后果和生态相关性对于指导保持独立性的策略的发展是重要的。然而,很少有研究调查步行相关的疲劳和对步行不稳定的影响。我们的目的是研究长时间步行对腿部肌肉活动和对平衡紊乱的脆弱性的影响。18名健康的年轻人以他们喜欢的步行速度完成了30分钟的步行试验,同时记录了腿部肌肉的活动。在30分钟步行之前和之后,参与者对5个5%体重的侧向力扰动做出反应。用小波变换和主成分分析的时频分析评估了肌肉对长时间行走的神经肌肉适应性。在长时间行走后,我们观察到比目鱼肌和胫骨前肌在较慢频率下的肌电图强度随时间增加,而比目鱼肌、腓肠肌外侧和半腱肌的平均振幅下降。步行30分钟后,扰动后的平均中外侧CoM位移平均增加21%。我们的研究结果表明,以舒适的速度步行30分钟会引起复杂的神经肌肉适应,表明局部肌肉疲劳和对行走平衡扰动的脆弱性增加。这些发现可以为疲劳监测系统或步行辅助设备提供信息,旨在减少步行相关的疲劳并保持独立的行动能力。
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引用次数: 0
Automatic selection of IMFs to denoise the sEMG signals using EMD 使用EMD自动选择IMF以对sEMG信号进行去噪。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-10-20 DOI: 10.1016/j.jelekin.2023.102834
Pratap Kumar Koppolu, Krishnan Chemmangat

Surface Electromyography (sEMG) signals are muscle activation signals, which has applications in muscle diagnosis, rehabilitation, prosthetics, and speech etc. However, they are known to be affected by noises such as Power Line Interference (PLI), motion artifacts etc. Currently, Empirical Mode Decomposition (EMD) and its modifications such as Ensemble EMD (EEMD), and Complementary EEMD (CEEMD) are used to decompose EMG into a series of Intrinsic Mode Functions (IMFs). The denoised EMG can be obtained from the selected IMFs. Statistical methods are used to select the signal dominant IMFs to reconstruct the denoised signal. In this work, a novel procedure is proposed to automatically separate noisy IMFs from the original sEMG signal. For this purpose, Permutation Entropy (PE) is employed in EEMD sifting process called Partly EEMD (PEEMD), to separate the noisy IMFs from the original sEMG signal according to the preset PE threshold. PEEMD decomposes the original signal into various modes according to a preset PE threshold and the denoised signal is reconstructed from resultant IMFs. The PEEMD denoising procedure is applied on the experimental sEMG data collected from eight subjects, that include six various upper limb movement classes. The proposed denoising procedure achieved an improved denoising performance in comparison with EMD, EEMD, and CEEMD. An alternate measure called Sample Entropy (SE) is also used in place of PE, for the automated sifting process as a comparison. Signal to Noise Ratio (SNR), Root Mean Square Error (RMSE), and Reconstruction Error (RE) parameters are used to evaluate the denoising performance. The results, averaged across eight subjects, demonstrate that the proposed denoising procedure outperforms the state-of-the-art EMD techniques in terms of these performance measures on the experimentally collected sEMG data samples.

表面肌电图(sEMG)信号是肌肉激活信号,在肌肉诊断、康复、假肢和语音等方面有应用。然而,已知它们会受到诸如电力线干扰(PLI)、运动伪像等噪声的影响,和互补EEMD(CEEMD)用于将EMG分解为一系列固有模式函数(IMF)。可以从所选择的IMF中获得去噪的EMG。使用统计方法来选择信号主导的IMF以重构去噪信号。在这项工作中,提出了一种从原始sEMG信号中自动分离噪声IMF的新方法。为此,在被称为部分EEMD(PEEMD)的EEMD筛选过程中,采用排列熵(PE),根据预设的PE阈值将噪声IMF从原始sEMG信号中分离出来。PEEMD根据预设的PE阈值将原始信号分解成各种模式,并且从所得的IMF重建去噪信号。PEEMD去噪程序应用于从八名受试者收集的实验sEMG数据,这些受试者包括六种不同的上肢运动类别。与EMD、EEMD和CEEMD相比,所提出的去噪程序实现了改进的去噪性能。另一种称为样本熵(SE)的测量方法也用于代替PE,用于自动筛选过程作为比较。信噪比(SNR)、均方根误差(RMSE)和重建误差(RE)参数用于评估去噪性能。八个受试者的平均结果表明,在实验收集的sEMG数据样本上,所提出的去噪程序在这些性能指标方面优于最先进的EMD技术。
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引用次数: 0
Mechanical characteristic of supraspinatus muscle changes independent of its size and intramuscular fat in patient with rotator cuff repair 肩袖修复患者冈上肌的力学特性变化与肌内脂肪和肌内脂肪无关。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-10-14 DOI: 10.1016/j.jelekin.2023.102831
Jun Umehara , Yasuyuki Ueda , Masahide Yagi , Shusuke Nojiri , Takashi Tachibana , Katsuya Nobuhara , Noriaki Ichihashi

Purpose

This study aimed i) to investigate the mechanical, morphological, and compositional characteristics of the supraspinatus muscle after rotator cuff repair by using ultrasound shear wave elastography (SWE) and B-mode imaging, and ii) to determine whether the morphological or compositional characteristics are associated with the mechanical characteristic of the supraspinatus during contraction.

Methods

Using SWE and B-mode imaging, active and passive shear moduli, muscle thickness, and echo intensity of the supraspinatus were measured from the repaired and contralateral control shoulders of 22 patients with rotator cuff repair. The shear modulus, muscle thickness, and echo intensity were compared between the repaired and control shoulders. The association between the active shear modulus and the other variables was determined.

Results

While the active and passive shear moduli were lower in the repaired shoulder compared to the control, the muscle thickness and echo intensity did not vary between them. Interestingly, the passive shear modulus was positively correlated with the active shear modulus only in the control shoulder.

Conclusion

The mechanical characteristic of supraspinatus remains impaired, even without degenerative changes in the morphological and compositional characteristics after rotator cuff repair. Furthermore, the association between contractile and elastic characteristics in the supraspinatus was deteriorated in control shoulder.

目的:本研究旨在通过超声剪切波弹性成像(SWE)和B模式成像研究肩袖修复后冈上肌的力学、形态和成分特征,和ii)确定形态或组成特征是否与冈上肌在收缩过程中的机械特征相关。方法:采用SWE和B模式成像,对22例肩袖修复患者的修复肩和对侧对照肩测量冈上肌的主动和被动剪切模量、肌肉厚度和回声强度。比较修复肩和对照肩的剪切模量、肌肉厚度和回声强度。确定了主动剪切模量和其他变量之间的关系。结果:与对照组相比,修复后的肩部的主动和被动剪切模量较低,但两者之间的肌肉厚度和回声强度没有变化。有趣的是,只有在对照肩部,被动剪切模量与主动剪切模量呈正相关。结论:肩袖修复术后,冈上肌的力学特性仍然受损,甚至在形态和组成特征上没有退行性变化。此外,在对照肩中,冈上肌的收缩和弹性特征之间的关系恶化。
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引用次数: 0
Spinal kinematic variability is increased in people with chronic low back pain during a repetitive lifting task 慢性腰痛患者在重复性举重任务中脊柱运动变异性增加。
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-10-14 DOI: 10.1016/j.jelekin.2023.102832
Amal M. Alsubaie , Andy Sanderson , Hélio V. Cabral , Eduardo Martinez-Valdes , Deborah Falla

Changes in spinal kinematic variability have been observed in people with chronic non-specific LBP (CNSLBP) during the performance of various repetitive functional tasks. However, the direction of these changes (i.e., less or more kinematic variability) is not consistent. This study aimed to assess differences in kinematic variability of the 3D angular displacement of thoracic and lumbar spinal segments in people with CNSLBP compared to asymptomatic individuals during a repetitive lifting task. Eleven people with CNSLBP and 11 asymptomatic volunteers performed 10 cycles of multi-planar lifting movements while spinal kinematics were recorded. For the three planes of motion, point-by-point standard deviations (SDs) were computed across all cycles of lifting and the average was calculated as a measure of kinematic variability for both segments. People with CNSLBP displayed higher thoracic (F = 8.00, p = 0.010, ηp2 = 0.286) and lumbar kinematic variability (F = 5.48, p = 0.030, ηp2 = 0.215) in the sagittal plane. Moreover, group differences were observed in the transversal plane for thoracic (F = 7.62, p = 0.012, ηp2 = 0.276) and lumbar kinematic variability (F = 5.402, p = 0.031, ηp2 = 0.213), as well as in the frontal plane for thoracic (F = 7.27, p = 0.014, ηp2 = 0.267) and lumbar kinematic variability (F = 6.11, p = 0.022, ηp2 = 0.234), all showing higher variability in those with CNSLBP. A significant main effect of group was not detected (p > 0.05) for spinal range of motion (ROM). Thus, people with CNSLBP completed the lifting task with the same ROM in all three planes of motion as observed for asymptomatic individuals, yet they performed the lifting task with higher spinal kinematic cycle-to-cycle variation.

在慢性非特异性LBP(CNSLBP)患者执行各种重复功能任务期间,已观察到脊柱运动变异性的变化。然而,这些变化的方向(即更少或更多的运动学变化)并不一致。本研究旨在评估CNSLBP患者与无症状患者在重复举重任务中胸腰椎节段三维角位移的运动变异性差异。11名CNSLBP患者和11名无症状志愿者进行了10个周期的多平面提升运动,同时记录了脊柱运动学。对于三个运动平面,在所有提升循环中计算逐点标准偏差(SD),并计算平均值作为两个节段运动可变性的测量值。CNSLBP患者在矢状面上表现出较高的胸部(F=8.00,p=0.010,ηp2=0.286)和腰部运动变异性(F=5.48,p=0.030,ηp2=0.0215)。此外,在胸部(F=7.62,p=0.012,ηp2=0.276)和腰部运动变异性(F=5.402,p=0.031,ηp2=0.0213)的横向平面上,以及在胸部(F=7.27,p=0.014,ηp20.267)和腰部运动学变异性(F=6.11,p=0.022,ηp20.234)的额叶平面上,观察到了组间差异,在CNSLBP患者中均显示出较高的变异性。该组对脊柱活动范围(ROM)没有显著的主要影响(p>0.05)。因此,CNSLBP患者在所有三个运动平面上都以与无症状个体相同的ROM完成了提升任务,但他们在执行提升任务时脊柱运动周期与周期之间的变化更高。
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引用次数: 0
Does cross-education minimize the loss of muscle force and power and sEMG amplitude during short-term detraining in older women who are recreationally engaged in resistance training? 在娱乐性进行阻力训练的老年女性的短期去训练中,交叉教育是否能最大限度地减少肌肉力量和sEMG振幅的损失?
IF 2.5 4区 医学 Q3 NEUROSCIENCES Pub Date : 2023-10-14 DOI: 10.1016/j.jelekin.2023.102835
Daniel de Souza Teixeira , Marcelo A.S. Carneiro , Augusto Corrêa de Queiroz Freitas , Anderson Diogo de Souza Lino , Danyelle Cristina Silva Pelet , Cláudio O. Assumpção , Markus Vinicius Campos Souza , Fábio Lera Orsatti

This study aimed to investigate whether 4 weeks of unilateral resistance training (RT) could attenuate the decline in muscle function in the contralateral limb of older women recreationally engaged in RT compared to control group (CTL). Twenty-four participants completed a 10-week RT before the cross-education (CR-Edu) phase and subsequent detraining. Afterward, participants were randomized into two groups: CTL (n = 8 women, n = 16 legs) who underwent 4 weeks of detraining without any training, and CR-Edu (n = 16 women, n = 16 legs) who performed 4 weeks of unilateral RT. Muscle force, power, and surface electromyography were measured unilaterally before and after the 4-week period, using five repetitions conducted at 40% and 60% of the 1RM. The results showed a reduction in muscle force at both 40% and 60% of 1RM, as well as a decrease in power at 60% of 1RM (P-time < 0.05) without significant differences between the two groups (P interaction > 0.05). There was a decline in power at 60% of 1RM (P-time < 0.05) but no significant change at 40% of 1RM (P-time > 0.05), and again, no significant differences were observed between the groups (P-interaction > 0.05). The surface electromyography of vastus lateralis decreased only in the CTL group (P-interaction < 0.05). Older women recreationally engaged in RT who perform in unilateral leg extension compared to a brief period of detraining seem not to retain muscle force and power, and sEMG amplitude of their homologous and contralateral limb.

本研究旨在研究与对照组(CTL)相比,4周的单侧阻力训练(RT)是否可以减轻娱乐性参与RT的老年女性对侧肢体肌肉功能的下降。24名参与者在交叉教育(CR Edu)阶段和随后的退训之前完成了为期10周的RT。之后,参与者被随机分为两组:CTL(n=8名女性,n=16条腿)和CR Edu(n=16名女性,n=16条腿),她们在没有任何训练的情况下进行了4周的单侧RT。在4周前后单侧测量肌肉力量、力量和表面肌电图,使用在1RM的40%和60%下进行的五次重复。结果显示,在1RM的40%和60%时,肌肉力量都减少了,在1RM的60%时,力量也减少了(P时间0.05
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Journal of Electromyography and Kinesiology
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