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

Effects of repetition of a car-driving pedal maneuver and neural output in older adults 重复汽车驾驶踏板动作对老年人神经输出的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-31 DOI: 10.1016/j.jelekin.2024.102883

Shun Kunugi , Aleš Holobar , Akira Nakagoshi , Kyosuke Kawabe , Kohei Watanabe

{"title":"Effects of repetition of a car-driving pedal maneuver and neural output in older adults","authors":"Shun Kunugi , Aleš Holobar , Akira Nakagoshi , Kyosuke Kawabe , Kohei Watanabe","doi":"10.1016/j.jelekin.2024.102883","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102883","url":null,"abstract":"<div><p>Understanding the ability of older adults to control pedal position angle and investigating whether this ability can be enhanced through practice may contribute to the prevention of traffic accidents. This study aimed to investigate repetitive effects on variability of the pedal position and neural drive during car-pedal operation in older adults. Thirteen older and 11 young adults performed 105 (21 sets × 5 repetitions) pedal angle control tasks with plantar flexor contraction. High-density surface electromyograms were recorded of triceps surae muscles. A cumulative spike train as a neural drive was calculated using continuously active motor unit activities. The coefficient of variation of the angle was higher in older (1.47 ± 1.06 %) than young (0.41 ± 0.21 %) adults in the first sets, and improved to 0.67 ± 0.51 % in the final sets in older adults only. There was no significant difference in neural drive variability between older and young adults. Our results suggest that repetition improves angular steadiness in older adults. However, this effect could not be explained by neural output which is estimated from lower threshold motor units that are continuously active.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140342524","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

Added load increases the peak frequency of intermuscular coherence 增加负荷可提高肌间连贯性的峰值频率

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-31 DOI: 10.1016/j.jelekin.2024.102881

Nicholas W. Baumgartner, Jacquelyn P. Hill, Shail Bhatnagar, Raymond Roos, Betty Soliven, Kourosh Rezania, Naoum P. Issa

{"title":"Added load increases the peak frequency of intermuscular coherence","authors":"Nicholas W. Baumgartner, Jacquelyn P. Hill, Shail Bhatnagar, Raymond Roos, Betty Soliven, Kourosh Rezania, Naoum P. Issa","doi":"10.1016/j.jelekin.2024.102881","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102881","url":null,"abstract":"<div><p>Cortical motor neuron activity appears to drive lower motor neurons through two distinct frequency bands: the β range (15–30 Hz) during weak muscle contractions and γ range (30–50 Hz) during strong contractions. It is unknown whether the frequency of cortical drive shifts continuously or abruptly between the β and γ frequency bands as contraction strength changes. Intermuscular coherence (IMC) between synergistic arm muscles was used to assess how the frequency of common neuronal drive shifts with increasing contraction strength. Muscle activity was recorded by surface electromyography (EMG) from the biceps and brachioradialis in nine healthy adults performing 30-second isometric holds with added loads. IMC was calculated across the two muscle groups during the isometric contraction. Significant IMC was present in the 20 to 50 Hz range with all loads. Repeated measures ANOVA show the peak frequency of IMC increased significantly when load was added, from a peak of 32.7 Hz with no added load, to 35.3 Hz, 35.7 Hz, and 36.3 Hz with three-, five-, and ten-pound loads respectively. An increase in IMC frequency occurs in response to added load, suggesting that cortical drive functions over a range of frequencies as a function of an isometric contraction against load.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140345331","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

Consensus for experimental design in electromyography (CEDE) project: Checklist for reporting and critically appraising studies using EMG (CEDE-Check) 肌电图实验设计共识（CEDE）项目：肌电图研究报告和批判性评估核对表（CEDE-Check）

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-13 DOI: 10.1016/j.jelekin.2024.102874

Manuela Besomi , Valter Devecchi , Deborah Falla , Kevin McGill , Matthew C. Kiernan , Roberto Merletti , Jaap H. van Dieën , Kylie Tucker , Edward A. Clancy , Karen Søgaard , François Hug , Richard G. Carson , Eric Perreault , Simon Gandevia , Thor Besier , John C. Rothwell , Roger M. Enoka , Aleš Holobar , Catherine Disselhorst-Klug , Tim Wrigley , Paul W. Hodges

{"title":"Consensus for experimental design in electromyography (CEDE) project: Checklist for reporting and critically appraising studies using EMG (CEDE-Check)","authors":"Manuela Besomi , Valter Devecchi , Deborah Falla , Kevin McGill , Matthew C. Kiernan , Roberto Merletti , Jaap H. van Dieën , Kylie Tucker , Edward A. Clancy , Karen Søgaard , François Hug , Richard G. Carson , Eric Perreault , Simon Gandevia , Thor Besier , John C. Rothwell , Roger M. Enoka , Aleš Holobar , Catherine Disselhorst-Klug , Tim Wrigley , Paul W. Hodges","doi":"10.1016/j.jelekin.2024.102874","DOIUrl":"10.1016/j.jelekin.2024.102874","url":null,"abstract":"<div><p>The diversity in electromyography (EMG) techniques and their reporting present significant challenges across multiple disciplines in research and clinical practice, where EMG is commonly used. To address these challenges and augment the reproducibility and interpretation of studies using EMG, the Consensus for Experimental Design in Electromyography (CEDE) project has developed a checklist (CEDE-Check) to assist researchers to thoroughly report their EMG methodologies. Development involved a multi-stage Delphi process with seventeen EMG experts from various disciplines. After two rounds, consensus was achieved. The final CEDE-Check consists of forty items that address four critical areas that demand precise reporting when EMG is employed: the task investigated, electrode placement, recording electrode characteristics, and acquisition and pre-processing of EMG signals. This checklist aims to guide researchers to accurately report and critically appraise EMG studies, thereby promoting a standardised critical evaluation, and greater scientific rigor in research that uses EMG signals. This approach not only aims to facilitate interpretation of study results and comparisons between studies, but it is also expected to contribute to advancing research quality and facilitate clinical and other practical applications of knowledge generated through the use of EMG.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S105064112400018X/pdfft?md5=3e5431d33515cacb4c25ca98b897dc84&pid=1-s2.0-S105064112400018X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140156480","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

NeuroMechanics: Electrophysiological and computational methods to accurately estimate the neural drive to muscles in humans in vivo 神经力学：电生理学和计算方法，用于准确估算体内神经对人体肌肉的驱动力

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-07 DOI: 10.1016/j.jelekin.2024.102873

Arnault H. Caillet , Andrew T.M. Phillips , Luca Modenese , Dario Farina

{"title":"NeuroMechanics: Electrophysiological and computational methods to accurately estimate the neural drive to muscles in humans in vivo","authors":"Arnault H. Caillet , Andrew T.M. Phillips , Luca Modenese , Dario Farina","doi":"10.1016/j.jelekin.2024.102873","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102873","url":null,"abstract":"<div><p>The ultimate neural signal for muscle control is the neural drive sent from the spinal cord to muscles. This neural signal comprises the ensemble of action potentials discharged by the active spinal motoneurons, which is transmitted to the innervated muscle fibres to generate forces. Accurately estimating the neural drive to muscles in humans <em>in vivo</em> is challenging since it requires the identification of the activity of a sample of motor units (MUs) that is representative of the active MU population. Current electrophysiological recordings usually fail in this task by identifying small MU samples with over-representation of higher-threshold with respect to lower-threshold MUs. Here, we describe recent advances in electrophysiological methods that allow the identification of more representative samples of greater numbers of MUs than previously possible. This is obtained with large and very dense arrays of electromyographic electrodes. Moreover, recently developed computational methods of data augmentation further extend experimental MU samples to infer the activity of the full MU pool. In conclusion, the combination of new electrode technologies and computational modelling allows for an accurate estimate of the neural drive to muscles and opens new perspectives in the study of the neural control of movement and in neural interfacing.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140187793","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

Whole-body kinematics of squats two decades following anterior cruciate ligament injury 前十字韧带损伤二十年后深蹲的全身运动学特性

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-07 DOI: 10.1016/j.jelekin.2024.102870

Ann-Katrin Stensdotter , Lina Schelin , Charlotte K. Häger

{"title":"Whole-body kinematics of squats two decades following anterior cruciate ligament injury","authors":"Ann-Katrin Stensdotter , Lina Schelin , Charlotte K. Häger","doi":"10.1016/j.jelekin.2024.102870","DOIUrl":"10.1016/j.jelekin.2024.102870","url":null,"abstract":"<div><h3>Background</h3><p>Kinematic studies suggest that injury of the anterior cruciate ligament (ACL) leads to long-lasting movement deficits or compensations to unload the injured knee. This study evaluated lower body kinematics during squats in individuals who suffered unilateral ACL-injury more than 20 years ago. Method: Using motion capture, we compared maximum squat depth, time to complete the squat task, detailed kinematics, estimated kinetic-chain joint moments 0- 80° knee flexion, and weight distribution between legs across three groups with (ACL<sub>R</sub>, n = 27) and without ACL-reconstructive surgery (ACL<sub>PT</sub>, physiotherapy only, n = 28), and age-matched non-injured asymptomatic Controls (n = 31, average age across groups 47 years). Results: ACL<sub>PT</sub> demonstrated significantly reduced squat depth compared to Controls (p = 0.004), whereas ACL<sub>R</sub> performed similarly to Controls (p = 1.000). Other outcome variables were comparable between groups. All participants nevertheless demonstrated asymmetric weight distribution between legs but without systematic unloading of the injured side in the ACLgroups. Conclusion: Expected compensatory strategies were not found in the ACL-groups, while poorer squat performance in the ACL-deficient group may depend on pure knee-joint mechanics, or lifestyle factors attributed to a less stable knee decades after ACL-injury.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000142/pdfft?md5=45d55b51960284406e313c17c18f1c36&pid=1-s2.0-S1050641124000142-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140091039","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

A fast gradient convolution kernel compensation method for surface electromyogram decomposition 用于表面肌电图分解的快速梯度卷积核补偿方法

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-04 DOI: 10.1016/j.jelekin.2024.102869

Chuang Lin , Ziwei Cui , Chen Chen , Yanhong Liu , Chen Chen , Ning Jiang

{"title":"A fast gradient convolution kernel compensation method for surface electromyogram decomposition","authors":"Chuang Lin , Ziwei Cui , Chen Chen , Yanhong Liu , Chen Chen , Ning Jiang","doi":"10.1016/j.jelekin.2024.102869","DOIUrl":"10.1016/j.jelekin.2024.102869","url":null,"abstract":"<div><p>Decomposition of EMG signals provides the decoding of motor unit (MU) discharge timings. In this study, we propose a fast gradient convolution kernel compensation (fgCKC) decomposition algorithm for high-density surface EMG decomposition and apply it to an offline and real-time estimation of MU spike trains. We modified the calculation of the cross-correlation vectors to improve the calculation efficiency of the gradient convolution kernel compensation (gCKC) algorithm. Specifically, the new fgCKC algorithm considers the past gradient in addition to the current gradient. Furthermore, the EMG signals are divided by sliding windows to simulate real-time decomposition, and the proposed algorithm was validated on simulated and experimental signals. In the offline decomposition, fgCKC has the same robustness as gCKC, with sensitivity differences of 2.6 ± 1.3 % averaged across all trials and subjects. Nevertheless, depending on the number of MUs and the signal-to-noise ratio of signals, fgCKC is approximately 3 times faster than gCKC. In the real-time part, the processing only needed 240 <em>ms</em> average per window of EMG signals on a regular personal computer (IIntel(R) Core(TM) i5-12490F 3 GHz, 16 GB memory). These results indicate that fgCKC achieves real-time decomposition by significantly reducing processing time, providing more possibilities for non-invasive neuronal behavior research.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140076459","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 combined lumbar spine fusion and total hip arthroplasty on spine, pelvis, and hip kinematics during a sit to stand task 联合腰椎融合术和全髋关节置换术对从坐到站任务中脊柱、骨盆和髋关节运动学的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-03 DOI: 10.1016/j.jelekin.2024.102871

Shawn M. Robbins , Evangelos Tyrpenou , Soomin Lee , Patrick Ippersiel , John Antoniou

{"title":"Impact of combined lumbar spine fusion and total hip arthroplasty on spine, pelvis, and hip kinematics during a sit to stand task","authors":"Shawn M. Robbins , Evangelos Tyrpenou , Soomin Lee , Patrick Ippersiel , John Antoniou","doi":"10.1016/j.jelekin.2024.102871","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102871","url":null,"abstract":"<div><p>Lumbar fusion is a risk factor for hip dislocation following total hip arthroplasty (THA). The objective was to compare joint/segment angles during sit-stand-sit in participants that had a THA with and without a lumbar fusion. The secondary objective was to compare pain, physical function, disability, and quality of life. This cross-sectional study includes participants that had THA and lumbar fusion (THA-fusion; n = 12) or THA only (THA-only; n = 12). Participants completed sit-stand-sit trials. Joint/segment angles were measured using electromagnetic motion capture. Angle characteristics were determined using principal component analysis. Hierarchical linear models examined relationships between angle characteristics and groups. Pain, physical function, and disability were compared using Mann-Whitney U tests. Upper lumbar spine was more extended during sit-stand-sit in the THA-fusion group (b = 42.41, <em>P</em> = 0.04). The pelvis was more posteriorly and anteriorly tilted during down and end sit-stand-sit phases, respectively, in the THA-fusion group (b = 12.21, <em>P</em> = 0.03). There were no significant associations between group and other angles. THA-fusion group had worse pain, physical function, disability, and quality of life. Although differences in spine joint, pelvis segment, and hip joint angles existed, these findings are unlikely to account for the increased incidence of hip dislocation after total hip arthroplasty in patients that had spine fusion.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000154/pdfft?md5=3635de969fdb0d3358adace0cc3b4254&pid=1-s2.0-S1050641124000154-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140062115","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

How many motor units is enough? An assessment of the influence of the number of motor units on firing rate calculations 多少个运动单位才足够？评估运动单元数量对点火率计算的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-03-03 DOI: 10.1016/j.jelekin.2024.102872

Michael J. Marsala , David A. Gabriel , J. Greig Inglis , Anita D. Christie

{"title":"How many motor units is enough? An assessment of the influence of the number of motor units on firing rate calculations","authors":"Michael J. Marsala , David A. Gabriel , J. Greig Inglis , Anita D. Christie","doi":"10.1016/j.jelekin.2024.102872","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102872","url":null,"abstract":"<div><p>The number of motor units included in calculations of mean firing rates varies widely in the literature. It is unknown how the number of decomposed motor units included in the calculation of firing rate per participant compares to the total number of active motor units in the muscle, and if this is different for males and females. Bootstrapped distributions and confidence intervals (CI) of mean motor unit firing rates decomposed from the tibialis anterior were used to represent the total number of active motor units for individual participants in trials from 20 to 100 % of maximal voluntary contraction. Bootstrapped distributions of mean firing rates were constructed using different numbers of motor units, from one to the maximum number for each participant, and compared to the CIs. A probability measure for each number of motor units involved in firing rate was calculated and then averaged across all individuals. Motor unit numbers required for similar levels of probability increased as contraction intensity increased (<em>p</em> < 0.001). Increased levels of probability also required higher numbers of motor units (<em>p</em> < 0.001). There was no effect of sex (<em>p</em> ≥ 0.97) for any comparison. This methodology should be repeated in other muscles, and aged populations.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140052584","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

Spatiotemporal lower-limb asymmetries during stair descent in athletes following anterior cruciate ligament reconstruction 前十字韧带重建后运动员下楼梯时的下肢时空不对称现象

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-02-10 DOI: 10.1016/j.jelekin.2024.102868

Dario G. Liebermann , Jonas L. Markström , Jonas Selling , Charlotte K. Häger

{"title":"Spatiotemporal lower-limb asymmetries during stair descent in athletes following anterior cruciate ligament reconstruction","authors":"Dario G. Liebermann , Jonas L. Markström , Jonas Selling , Charlotte K. Häger","doi":"10.1016/j.jelekin.2024.102868","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102868","url":null,"abstract":"<div><h3>Purpose</h3><p>This study evaluated motor control recovery at different times following anterior cruciate ligament reconstruction (ACLR) by investigating lower-limb spatiotemporal symmetry during stair descent performances.</p></div><div><h3>Methods</h3><p>We used a cross-sectional design to compare asymptomatic athletes (Controls, n = 18) with a group of people with ACLR (n = 49) divided into three time-from-ACLR subgroups (Early: <6 months, n = 17; Mid: 6–18 months, n = 16; Late: ≥18 months, n = 16). We evaluated: “temporal symmetry” during the stance subphases (single-support, first and second double-support) and “spatial symmetry” for hip-knee-ankle intra-joint angular displacements during the stance phase using a dissimilarity index applied on superimposed 3D phase plots.</p></div><div><h3>Results</h3><p>We found significant between-group differences in temporal variables (p ≤ 0.001). Compared to Controls, both Early and Mid (p ≤ 0.05) showed asymmetry in the first double-support time (longer for their injured vs. non-injured leg), while Early generally also showed longer durations in all other phases, regardless of stepping leg. No statistically significant differences were found for spatial intra-joint symmetry between groups.</p></div><div><h3>Conclusion</h3><p>Temporal but not spatial asymmetry in stair descent is often present early after ACLR; it may remain for up to 18 months and may underlie subtle intra- and inter-joint compensations. Spatial asymmetry may need further exploration.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000129/pdfft?md5=ec5d40beed2a2b4129c4d5b6f79451e2&pid=1-s2.0-S1050641124000129-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139738375","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

Excitation distribution of the trapezius changes in response to increasing contraction intensity, but not repeated contractions 斜方肌的兴奋分布随收缩强度的增加而变化，但不随重复收缩而变化

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-02-02 DOI: 10.1016/j.jelekin.2024.102866

Kara-Lyn Harrison, Zachariah Henderson, Josée Rochon, Sarah Bohunicky, Trisha Scribbans

{"title":"Excitation distribution of the trapezius changes in response to increasing contraction intensity, but not repeated contractions","authors":"Kara-Lyn Harrison, Zachariah Henderson, Josée Rochon, Sarah Bohunicky, Trisha Scribbans","doi":"10.1016/j.jelekin.2024.102866","DOIUrl":"10.1016/j.jelekin.2024.102866","url":null,"abstract":"<div><p>Upper trapezius (UT) excitation redistributes with experimentally-induced muscle pain, fatigue, and repeated contractions. Excitation distribution variability is proposed to reduce the likelihood of shoulder pain and pathology by reducing cumulative stress on musculoskeletal structures. While the middle (MT) and lower (LT) trapezius are pivotal in scapular stabilization, it remains unclear whether they display similar excitation distribution variability with repeated or increasing contraction intensity. We determined if excitation distribution of the UT, MT, and LT differ: 1) during isometric contractions at different intensities (30 % and 60 % of maximum voluntary isometric contraction (MVIC)); and 2) with repeated contractions at 60 % MVIC. Nineteen individuals completed MVICs and submaximal contractions for the UT, MT, and LT while high-density electromyography was collected. Statistical parametric mapping t-tests were performed between intensities and the 1st and 5th repetition at 60 % MVIC. UT, MT, and LT excitation distribution changed with increasing contraction intensity in 358 (∼92 % of the map), 54 (∼14 %), and 270 pixels (∼70 %), respectively. No pixels exceeded significance with repeated contractions for any muscle. Barycentre analyses revealed no significant results. These results suggest that regions of the trapezius muscle use different neuromuscular strategies in response to changes in contraction intensity and repeated contractions.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000105/pdfft?md5=106f59e2a854fcadd97b8504c8f23399&pid=1-s2.0-S1050641124000105-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139669513","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