Journal of Electromyography and Kinesiology最新文献

Algorithm for jitter measurement in neuromuscular junction disease 神经肌肉交界处疾病的抖动测量算法

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-07-17 DOI: 10.1016/j.jelekin.2025.103042

Armando Malanda , Daniel Stashuk , César Valle , Javier Rodríguez-Falces , Javier Navallas , Mamede de Carvalho , José Castro , Oscar Garnés-Camarena

{"title":"Algorithm for jitter measurement in neuromuscular junction disease","authors":"Armando Malanda , Daniel Stashuk , César Valle , Javier Rodríguez-Falces , Javier Navallas , Mamede de Carvalho , José Castro , Oscar Garnés-Camarena","doi":"10.1016/j.jelekin.2025.103042","DOIUrl":"10.1016/j.jelekin.2025.103042","url":null,"abstract":"<div><div>The objective of this work was to extend the evaluation of a recently proposed method for estimating neuromuscular jitter within motor unit potential (MUP) trains extracted from muscles suffering neuromuscular junction disease. The method detects, within the MUP duration, “single-fiber” intervals that have likely been produced by single muscle fibers. Jitter is then estimated between pairs of these “single-fiber” intervals using an algorithm which incorporates the traditional mean consecutive difference (MCD) parameter.</div><div>Electromyographic (EMG) recordings from facial muscles of 15 patients with symptoms related to myasthenia gravis were obtained. MUP trains were extracted using DQEMG software and manual jitter measures were obtained using an ad-hoc graphical interface, which emulates single fiber EMG protocols. Automatic measures for two different values of an internal threshold parameter were obtained and compared to manual measures. 5 %, 25 %, 75 % and 95 % percentiles for the differences between the automatic and manual jitter measurements were [−3.74, −1.47, 1.24, 3.47 μs] and [−6.45, −2.07, 1.65, 7.16 μs], for the two threshold values, respectively. Therefore, very small statistical and clinical differences were found between the automatic and manual jitter measures, supporting the method as an accurate tool for jitter assessment or as a guiding aid for manual procedures.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"84 ","pages":"Article 103042"},"PeriodicalIF":2.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696864","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

An articulated ankle foot orthosis with plantarflexion resistance decreased soleus and tibialis anterior muscle activity, and plantarflexion moment of the paretic lower limb of persons with stroke 关节踝关节足矫形器，抗跖屈，降低比目鱼肌和胫骨前肌活动，减少中风患者下肢的跖屈力矩

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2025-07-14 DOI: 10.1016/j.jelekin.2025.103041

Oluwaseye P. Odanye , Emily A. Steffensen , Aaron D. Likens , Elisa S. Arch , Brian A. Knarr

{"title":"An articulated ankle foot orthosis with plantarflexion resistance decreased soleus and tibialis anterior muscle activity, and plantarflexion moment of the paretic lower limb of persons with stroke","authors":"Oluwaseye P. Odanye , Emily A. Steffensen , Aaron D. Likens , Elisa S. Arch , Brian A. Knarr","doi":"10.1016/j.jelekin.2025.103041","DOIUrl":"10.1016/j.jelekin.2025.103041","url":null,"abstract":"<div><div>Ankle foot orthoses (AFOs) are important devices for assisting persons with stroke during walking, especially in mediating dorsiflexor weakness. The plantarflexion (PF) resistances of AFOs have been shown to augment dorsiflexor muscle function during the stance and swing phases of gait. However, it is not clear how this translates to the muscle activities of their paretic lower limbs. To further explore this question in stroke rehabilitation, 3D technology was used in designing and fabricating an individual-specific articulated AFO, which we assembled with a mechanical joint that enabled the application of PF resistances. We investigated the impact of regulating two PF resistances (PF1, PF2) on their paretic lower limb muscle activity. At PF2, there was significantly lower mean muscle activity for the Soleus in LR and the Tibialis anterior in the second rocker, pre-swing, and swing phases. The device only impacted the activity of the medial gastrocnemius muscle at the second rocker. The findings corroborated evidence regarding how AFOs with PF resistance impact the muscle activity of stroke survivors following a single session use; however, longitudinal studies are necessary to establish the impacts with long-term use, as most stroke survivors use AFOs long-term.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"84 ","pages":"Article 103041"},"PeriodicalIF":2.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656287","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

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

IF 2 4区医学

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

{"title":"Comparing motor unit number estimation techniques","authors":"M.I.B. Debenham , O. Roussel , C.J. McNeil , M.J. Berger , B.H. Dalton","doi":"10.1016/j.jelekin.2025.103030","DOIUrl":"10.1016/j.jelekin.2025.103030","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"84 ","pages":"Article 103030"},"PeriodicalIF":2.0,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632856","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

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

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

{"title":"Shoulder load during wheelchair-related activities of daily life","authors":"Ursina Arnet , Dirkjan (H. E. J.) Veeger , Wiebe H.K. de Vries","doi":"10.1016/j.jelekin.2025.103027","DOIUrl":"10.1016/j.jelekin.2025.103027","url":null,"abstract":"<div><div>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.</div><div>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.</div><div>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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"84 ","pages":"Article 103027"},"PeriodicalIF":2.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517828","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

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

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

{"title":"The Probability Density Function (PDF) of surface EMG with increasing force: a comparison between the tibialis anterior and the vastus lateralis","authors":"Silvia Recalde-Villamayor , Javier Navallas , Cristina Mariscal , Armando Malanda , Javier Rodriguez-Falces","doi":"10.1016/j.jelekin.2025.103029","DOIUrl":"10.1016/j.jelekin.2025.103029","url":null,"abstract":"<div><h3>Objectives</h3><div>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 <em>tibialis anterior</em> (TA) and compare it to that of the <em>vastus lateralis</em> (VL).</div></div><div><h3>Methods</h3><div>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.</div></div><div><h3>Results</h3><div>(1) The sEMG filling process showed significant differences between the TA and VL muscles (p < 0.05).</div><div>(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.</div><div>(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).</div></div><div><h3>Conclusions</h3><div>(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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"84 ","pages":"Article 103029"},"PeriodicalIF":2.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548708","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

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

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

{"title":"A standard operating procedure for the evaluation of vertical jumps performance through surface electromyography assessment: A scoping review","authors":"Luca Petrigna , Alessandra Amato , Giorgia Longo , Alessandro Castorina , Simona Pajaujiene , Giuseppe Musumeci","doi":"10.1016/j.jelekin.2025.103028","DOIUrl":"10.1016/j.jelekin.2025.103028","url":null,"abstract":"<div><h3>Introduction</h3><div>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.</div></div><div><h3>Methods</h3><div>A scoping review was performed. Data were collected on PubMed, Web of Science, and Scopus till 20<sup>th</sup> December 2024. The articles were screened against the eligibility criteria and narratively discussed.</div></div><div><h3>Results</h3><div>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.</div></div><div><h3>Conclusions</h3><div>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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"83 ","pages":"Article 103028"},"PeriodicalIF":2.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366253","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

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

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

{"title":"The relationship between voluntary and electrically evoked muscle contractile properties in young women","authors":"Madison J. Fry, William S. Zoughaib, Richard L. Hoffman, Andrew R. Coggan","doi":"10.1016/j.jelekin.2025.103024","DOIUrl":"10.1016/j.jelekin.2025.103024","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"83 ","pages":"Article 103024"},"PeriodicalIF":2.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289131","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

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

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

{"title":"Neural control of human inspiratory muscles. What have we learnt from the study of single motor units?","authors":"Jane E. Butler , Simon C. Gandevia , Anna L. Hudson","doi":"10.1016/j.jelekin.2025.103026","DOIUrl":"10.1016/j.jelekin.2025.103026","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"83 ","pages":"Article 103026"},"PeriodicalIF":2.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472106","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

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

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

{"title":"Impact of different ranges of motion in the prone barbell row on muscle excitation","authors":"Josef Fischer , Christian Burger , Josefina Manieu Seguel , Coşkun Rodoplu , Florian Kurt Paternoster , Markus Tilp , Andreas Konrad","doi":"10.1016/j.jelekin.2025.103025","DOIUrl":"10.1016/j.jelekin.2025.103025","url":null,"abstract":"<div><div>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 (<em>p</em> < 0.001, <em>d</em> = − 0.59) and full ROM (<em>p</em> < 0.001, <em>d</em> = − 0.58). The TT exhibited significantly lower peak excitation in the upper-half ROM compared to the lower-half ROM (<em>p</em> = 0.042, <em>d</em> = 0.42) and full ROM (<em>p</em> = 0.013, <em>d</em> = 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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"83 ","pages":"Article 103025"},"PeriodicalIF":2.0,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271364","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

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

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

{"title":"Hamstring muscle shortens actively during the late swing phase of high-speed running","authors":"Jun Hee Yoon , Iseul Jo , Yoon Hyung Cho , Kyeongtak Song , Hae-Dong Lee","doi":"10.1016/j.jelekin.2025.103022","DOIUrl":"10.1016/j.jelekin.2025.103022","url":null,"abstract":"<div><div>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 % (<em>p</em> < 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 (<em>p</em> < 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.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"83 ","pages":"Article 103022"},"PeriodicalIF":2.0,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204992","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