Journal of Electromyography and Kinesiology最新文献_第3页

A U-Net based partial convolutional time-domain separation model to identify motor units from surface electromyographic signals in real time 基于U-Net的局部卷积时域分离模型，从肌电信号中实时识别运动单元。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102971

Ziwei Cui, Chuang Lin

{"title":"A U-Net based partial convolutional time-domain separation model to identify motor units from surface electromyographic signals in real time","authors":"Ziwei Cui, Chuang Lin","doi":"10.1016/j.jelekin.2024.102971","DOIUrl":"10.1016/j.jelekin.2024.102971","url":null,"abstract":"<div><div>This study proposed a U-Net based partial convolutional time-domain model for a real-time high-density surface electromyography (HD-sEMG) decomposition. The model combines U-Net and a separation block containing partial convolution, aiming to efficiently identify motor units (MUs) without preprocessing. The proposed U-Net based network was trained by the HD-sEMG signals with innervation pulse trains (IPTs) labels, and the results are compared between different step sizes, noises, and model structures under the sliding time window with 120 sampling points. The U-Net based model got an accuracy greater than 94 % under simulated signals and 85 % under experimental signals, and identified more MUs than the structures based on convolutional neural network (CNN) and temporal convolutional network (TCN). The average latency of the U-Net based model is only 64 ms (a window duration time plus the prediction time) under the step size 20 data in both types of signals, and can be generalized to new data at different signal-to-noise (SNR). The efficiency of the proposed model is significantly higher than traditional methods such as gCKC. Meanwhile, the accuracy of the proposed model was not significantly different from the gCKC. In addition, the performance of the network under different step sizes of the sliding time window was verified. The experimental results indicate that the U-Net based model provides an efficient framework for blind source separation (BSS) of EMG signals, expanding the application of EMG signals in neural interaction.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102971"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142900923","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

Person-specific characteristics of people with low back pain moderate the movement pattern within motor skill training and strength and flexibility exercise: Secondary analysis of a randomized clinical trial 腰痛患者在运动技能训练、力量和柔韧性锻炼中调节运动模式的个体特征：一项随机临床试验的二次分析。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102960

Quenten L. Hooker , Vanessa M. Lanier , Linda R. van Dillen

{"title":"Person-specific characteristics of people with low back pain moderate the movement pattern within motor skill training and strength and flexibility exercise: Secondary analysis of a randomized clinical trial","authors":"Quenten L. Hooker , Vanessa M. Lanier , Linda R. van Dillen","doi":"10.1016/j.jelekin.2024.102960","DOIUrl":"10.1016/j.jelekin.2024.102960","url":null,"abstract":"<div><div>People with low back pain (LBP) display an altered movement pattern during functional activities. Exercise-based treatments improve the altered pattern, but there is individual variability in the response to treatment. This study investigates the moderating effect of person-specific characteristics on a movement pattern at baseline and change over time in the pattern in people with chronic LBP who received motor skill training (MST) or strength and flexibility exercise (SFE). Kinematic data were collected at baseline, immediately post-treatment, and 6 months post-treatment. Lumbar contribution (LC) to total movement was used to quantify the magnitude of the altered movement pattern. Hierarchical linear modeling was used to explore the moderating effects of treatment group, age, sex, duration of LBP, and baseline LC on 1) baseline LC and 2) the change in LC over time. We found that person-specific characteristics moderated the change over time in LC within MST. Older people had a smaller change over time in LC and did not retain the improved pattern as well as younger people (β = 0.01, SE = 0.004, p < 0.01). People with greater baseline LC had a greater improvement in LC compared to people with less baseline LC (β = -0.07, SE = 0.01, p < 0.01).</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102960"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873611","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

Wavelet-based time-frequency intermuscular beta-band coherence decreases with age but increases after mental fatigue in ankle muscles during gait independent of age 基于小波的时频肌间β带相干性随年龄的增长而下降，但在独立于年龄的步态中踝关节肌肉精神疲劳后增加。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102957

Paulo Cezar Rocha dos Santos , Fabio Augusto Barbieri , Claudine Lamoth , Tibor Hortobágyi

{"title":"Wavelet-based time-frequency intermuscular beta-band coherence decreases with age but increases after mental fatigue in ankle muscles during gait independent of age","authors":"Paulo Cezar Rocha dos Santos , Fabio Augusto Barbieri , Claudine Lamoth , Tibor Hortobágyi","doi":"10.1016/j.jelekin.2024.102957","DOIUrl":"10.1016/j.jelekin.2024.102957","url":null,"abstract":"<div><div>Mental fatigue can affect cognitive function and interfere with motor performance. We examined if mental fatigue affected gait through age-specific modulation of wavelet-based time–frequency intermuscular beta-band coherence in muscles while walking on a treadmill at 1.2 m·s-1. The Psychomotor Vigilance Task, and the AX-Continuous Performance and the Stroop tests were used to induce mental fatigue in groups of healthy young and older participants. Mental fatigue reduced stance time, stride length, and marginally step width and increased cadence, stride length and stance time variability. In older compared with young participants before the induction of mental fatigue, wavelet-based time–frequency intermuscular beta-band coherence measured during walking was lower in the tibialis-peroneus and tibialis-gastrocnemius muscle pairs in specific phases of the gait cycle. In both age groups, after induction of mental fatigue, selected clusters of wavelet-based time–frequency intermuscular beta-band coherence measured during walking increased in the biceps-semitendinosus, rectus-vastus, tibialis-peroneus, gastrocnemius-soleus, and tibialis-gastrocnemius muscle pairs. In conclusion, we observed that while old age might weaken oscillatory coupling between selected ankle muscle pairs during gait, reflecting a certain level of impairment in the descending drive to these muscles, wavelet-based time–frequency intermuscular beta-band coherence measured during gait after mental fatigue migth increase independent of age.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102957"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792474","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

Inter-session Reliability of Magnetic Nerve Stimulation and Within-Session comparison to Electrical Nerve Stimulation in Evaluating Neuromuscular Function of Knee Extensor Muscles 在评估膝伸肌神经肌肉功能时，磁神经刺激的间歇可靠性和间歇内与电神经刺激的比较。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102964

Romina Ledergerber, Martin Keller

{"title":"Inter-session Reliability of Magnetic Nerve Stimulation and Within-Session comparison to Electrical Nerve Stimulation in Evaluating Neuromuscular Function of Knee Extensor Muscles","authors":"Romina Ledergerber, Martin Keller","doi":"10.1016/j.jelekin.2024.102964","DOIUrl":"10.1016/j.jelekin.2024.102964","url":null,"abstract":"<div><div>The Interpolated Twitch Technique with electrical nerve stimulation (ENS) is the considered gold-standard to assess voluntary activation (VA) but causes discomfort. Magnetic nerve stimulation (MNS) offers a painless alternative, though its validity and reliability remain underexplored. This study validates MNS to ENS and evaluates inter-session reliability in 16 healthy young adults (11 females). Data on resting single twitches (RS), superimposed doublets (ST) during maximal voluntary contractions, and resting double twitches (RT) were assessed using both MNS and ENS, alongside discomfort ratings (VAS). Intraclass correlation (ICC), coefficient of variation (CV) and mean absolute percentage error (MAPE) were used to quantify agreement between stimulations and/or inter-session reliability. Strong agreement between MNS and ENS was found for RS, RT, and VA (ICC = 0.77–0.88), with MAPE values of 4.4 % (VA) and 9.5 % (RT). Discomfort was lower for MNS (VAS = 1.0 ± 0.9) than ENS (VAS = 1.9 ± 1.1). Intersession–reliability for MNS was good (ICC = 0.78–0.95) with low CV for VA (4.9 %) but high for RS, RT and ST (61.7 %, 28.9 %, 82.0 %). Based on these results, MNS provides a valid, reliable, and painless alternative to ENS for assessing VA in knee extensor muscles. However, individual evoked twitches varied across methods and sessions, warranting caution when interpreting absolute values.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102964"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of surface electromyography normalisation methods over gait muscle synergies 表面肌电归一化方法对步态肌肉协同作用的影响。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102968

Pablo Ortega-Auriol , Thor Besier , Angus J.C. McMorland

引用次数: 0

The effect of physical activity lifestyle on in-vivo passive stiffness of the lumbar spine 运动生活方式对腰椎体内被动僵硬的影响。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102965

Joshua S.M. Lowery, Chelsea M. Dumasal, Kayla M. Fewster

{"title":"The effect of physical activity lifestyle on in-vivo passive stiffness of the lumbar spine","authors":"Joshua S.M. Lowery, Chelsea M. Dumasal, Kayla M. Fewster","doi":"10.1016/j.jelekin.2024.102965","DOIUrl":"10.1016/j.jelekin.2024.102965","url":null,"abstract":"<div><div>The passive stiffness of the lumbar spine has direct implications on one’s risk of injury and spinal instability. Therefore, the effects that physical activity lifestyle may have on the lumbar spine’s passive stiffness was assessed. Participants were classified as active (n = 20) or inactive (n = 21) after completing a physical activity questionnaire. Passive lumbar flexion and extension trials were completed on a custom passive jig. The participant’s moment–angle curves were determined, and their lumbar spine passive stiffness was analyzed by partitioning the curve into three linear stiffness regions of increasing stiffness. Stiffness in the low stiffness zone of the moment–angle curve was significantly lower in the inactive group (<em>p</em> = 0.014). Furthermore, time spent sitting in an office chair significantly predicted the stiffness in their low stiffness zones across all participants (<em>p</em> = 0.011). These findings suggest that physical activity lifestyle may be a potential avenue through which one’s lumbar spine passive stiffness may increase, improving spinal health and stability in the population.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102965"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142878006","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

Lower limb joint reaction forces during sit-to-stand and stand-to-sit movements in stroke patients with spastic hemiplegia 痉挛偏瘫患者坐-站和站-坐运动时下肢关节反作用力。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102969

Meijin Hou , Jian He , Dongwei Liu , Chenyi Guo , Ye Ma

{"title":"Lower limb joint reaction forces during sit-to-stand and stand-to-sit movements in stroke patients with spastic hemiplegia","authors":"Meijin Hou , Jian He , Dongwei Liu , Chenyi Guo , Ye Ma","doi":"10.1016/j.jelekin.2024.102969","DOIUrl":"10.1016/j.jelekin.2024.102969","url":null,"abstract":"<div><h3>Objective:</h3><div>We investigated the characteristics of hip, knee, and ankle joint reaction forces (JRFs) in stroke patients with spastic hemiplegia during sit-to-stand (Si-St) and stand-to-sit (St-Si) movements and explored the relationship between JRFs and joint moments.</div></div><div><h3>Methods:</h3><div>Thirteen stroke patients with spastic hemiplegia and thirteen age-matched healthy subjects were recruited in this study. Three-dimensional motion capture system and force plates were employed to collect kinematic data and ground reaction forces during Si-St and St-Si tasks. Musculoskeletal modeling was used to calculate JRFs and joint moments of the hip, knee and ankle joints during these movements.</div></div><div><h3>Results:</h3><div>Those stroke patients exhibited higher JRFs (ranging from 13.49 N/kg to 43.18 N/kg) compared to the healthy group (ranging from 15.81 N/kg to 23.00 N/kg) in hip and knee joints. Furthermore, hip and ankle JRFs exhibited positive correlations with their joint moment in stroke patients during Si-St and St-Si movements.</div></div><div><h3>Conclusion:</h3><div>Early rehabilitation strategies should focus on correcting weight distribution and enhancing symmetry in joint loading. Interventions focused on reducing joint moment, particularly for hip and ankle joints, may prove effective in mitigating lower extremity JRFs in stroke patients with spastic hemiplegia during Si-St and St-Si movements.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102969"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142928792","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

Electrical impedance myography in healthy adults: Reliability, sex differences, and regional variations in the anterior thigh muscles 健康成人的电阻抗肌图：可靠性、性别差异和大腿前肌的区域差异

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102972

Stefano Longo, Emiliano Cè, Giovanni Michielon, Susanna Rampichini, Giuseppe Coratella, Fabio Esposito

{"title":"Electrical impedance myography in healthy adults: Reliability, sex differences, and regional variations in the anterior thigh muscles","authors":"Stefano Longo, Emiliano Cè, Giovanni Michielon, Susanna Rampichini, Giuseppe Coratella, Fabio Esposito","doi":"10.1016/j.jelekin.2024.102972","DOIUrl":"10.1016/j.jelekin.2024.102972","url":null,"abstract":"<div><div>This study investigated the intra-day and inter-day reliability of electrical impedance myography (EIM) components and explored sex and regional differences in healthy adults’ anterior thigh muscles. Using a multifrequency device, impedance values across various frequencies, alongside 50-kHz resistance (R), reactance (Xc), and phase angle (PhA) were assessed in both sexes and at whole anterior thigh, proximal and distal regions. Findings revealed excellent reliability (ICC > 0.90) and low standard error of measurement (<5.0 %) for impedance at all frequencies, 50-kHz R, Xc, and PhA regardless of sex or measurement region during both intra-day and inter-day assessments. Moreover, differences were observed between women and men across most parameters, except for Xc, indicating the sensitivity of EIM in detecting established disparities in tissue composition between sexes. Notably, whole anterior thigh impedance at all frequencies and 50-kHz R, Xc, and PhA displayed dissimilarities compared to proximal or distal regions in both sexes. Additionally, women exhibited differences between proximal and distal regions in the 100-kHz impedance and 50-kHz impedance, R, Xc, and PhA highlighting possible variations in tissue composition along the muscle length compared to men. These findings underscore the relevance of electrode placement and emphasize sex-specific differences in EIM assessments within anterior thigh muscle regions.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102972"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142928823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of tasks on intramuscular regional differences in rectus femoris elasticity during isometric contraction: An ultrasound shear wave elastography study 在等距收缩过程中，任务对股直肌弹性的肌肉内区域差异的影响：超声剪切波弹性成像研究。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-02-01 DOI: 10.1016/j.jelekin.2024.102967

Taiki Kodesho , Kazuma Yamagata , Gakuto Nakao , Masaki Katayose , Keigo Taniguchi

{"title":"Effect of tasks on intramuscular regional differences in rectus femoris elasticity during isometric contraction: An ultrasound shear wave elastography study","authors":"Taiki Kodesho , Kazuma Yamagata , Gakuto Nakao , Masaki Katayose , Keigo Taniguchi","doi":"10.1016/j.jelekin.2024.102967","DOIUrl":"10.1016/j.jelekin.2024.102967","url":null,"abstract":"<div><h3>Purpose</h3><div>This study aimed to investigate intramuscular regional differences and task specificity of rectus femoris (RF) elasticity during isometric contraction.</div></div><div><h3>Methods</h3><div>Sixteen healthy males (aged 24.3 ± 4.1 years) participated in this study. The tasks included isometric hip flexion (HF) and knee extension (KE). The contractions were maintained at 0%, 30%, and 60% of their respective maximum voluntary isometric contraction (MVC) forces for 5 s each at 50˚ hip flexion and 90˚ knee flexion. RF elasticity was measured in two regions, proximal (33%) and distal (67%). The shear modulus (kPa), measured by shear wave elastography, was used to determine RF elasticity.</div></div><div><h3>Results</h3><div>A significant interaction effect was observed (intensity × region × task) (P = 0.01). Regarding regional differences during contraction, the proximal region exhibited a greater shear modulus than the distal region at 60% MVC in the hip flexion task (P = 0.001). Conversely, no regional differences were observed at either 30% MVC (P = 0.625) or 60% MVC (P = 0.568) in the knee extension task.</div></div><div><h3>Discussion</h3><div>Muscle shear modulus during contraction reflects active force, suggesting that mechanical stress can be applied primarily to the proximal region of the RF during the HF task.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102967"},"PeriodicalIF":2.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840357","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

JEK-ISEK tutorials on electromyography and kinesiology: A summary and a call for the next series of tutorials

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-01-23 DOI: 10.1016/j.jelekin.2025.102986

Alessandro Del Vecchio, François Hug, Roberto Merletti, Dario Farina

引用次数: 0