Journal of Electromyography and Kinesiology最新文献_第10页

Evaluation of generic EMG-Torque models across two Upper-Limb joints 评估两个上肢关节的通用 EMG 扭矩模型

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-02-01 DOI: 10.1016/j.jelekin.2024.102864

Haopeng Wang , Berj Bardizbanian , Ziling Zhu , He Wang , Chenyun Dai , Edward A. Clancy

{"title":"Evaluation of generic EMG-Torque models across two Upper-Limb joints","authors":"Haopeng Wang , Berj Bardizbanian , Ziling Zhu , He Wang , Chenyun Dai , Edward A. Clancy","doi":"10.1016/j.jelekin.2024.102864","DOIUrl":"10.1016/j.jelekin.2024.102864","url":null,"abstract":"<div><p>Advanced single-use dynamic EMG-torque models require burdensome subject-specific calibration contractions and have historically been <em>assumed</em> to produce lower error than generic models (i.e., models that are identical across subjects and muscles). To investigate this assumption, we studied generic one degree of freedom (DoF) models derived from the ensemble median of subject-specific models, evaluated across subject, DoF and joint. We used elbow (<em>N</em> = 64) and hand-wrist (<em>N</em> = 9) datasets. Subject-specific elbow models performed statistically better [5.79 ± 1.89 %MVT (maximum voluntary torque) error] than generic elbow models (6.21 ± 1.85 %MVT error). However, there were no statistical differences between subject-specific vs. generic models <em>within</em><span> each hand-wrist DoF. Next, we evaluated generic models across joints. The best hand-wrist generic model had errors of 6.29 ± 1.85 %MVT when applied to the elbow. The elbow generic model had errors of 7.04 ± 2.29 %MVT when applied to the hand-wrist. The generic elbow model was statistically better in both joints, compared to the generic hand-wrist model. Finally, we tested Butterworth filter models (a simpler generic model), finding no statistical differences between optimum Butterworth and subject-specific models. Overall, generic models simplified EMG-torque training without substantive performance degradation and provided the possibility of transfer learning between joints.</span></p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"75 ","pages":"Article 102864"},"PeriodicalIF":2.5,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139669110","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

Treadmill induced belt-accelerations may not accurately evoke the muscle responses to obstacle trips in older people 跑步机诱导的腰带加速可能无法准确唤起老年人肌肉对障碍行程的反应

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-01-23 DOI: 10.1016/j.jelekin.2024.102857

Steven Phu , Daina L. Sturnieks , Patrick Y.H. Song , Stephen R. Lord , Yoshiro Okubo

{"title":"Treadmill induced belt-accelerations may not accurately evoke the muscle responses to obstacle trips in older people","authors":"Steven Phu , Daina L. Sturnieks , Patrick Y.H. Song , Stephen R. Lord , Yoshiro Okubo","doi":"10.1016/j.jelekin.2024.102857","DOIUrl":"10.1016/j.jelekin.2024.102857","url":null,"abstract":"<div><h3>Background</h3><p>Treadmill belt-accelerations are a commonly utilised surrogate for tripping, but their physiological validity is unknown. This study examined if a treadmill belt-acceleration induces lower limb muscle activation responses similar to a trip on a walkway.</p></div><div><h3>Methods</h3><p>38 older people (65+ years) experienced one treadmill belt-acceleration and one walkway obstacle trip in random order. Muscle responses were assessed bilaterally using surface electromyography on the rectus femoris (RF), tibialis anterior (TA), semitendinosus (ST) and gastrocnemius medial head (GM). Unperturbed muscle activity, post-perturbation onset latency, peak magnitude, time to peak and co-contraction index (CCI) were examined.</p></div><div><h3>Results</h3><p>Muscle activity in the right ST was greater during unperturbed walking on the treadmill compared to walkway (<em>P</em>=0.011). Compared to a treadmill belt-acceleration, a walkway trip elicited faster onset latencies in all muscles; greater peak magnitudes in the left RF, TA, GM and right GM; faster time to peaks in the left TA and right GM; and lower knee and ankle muscle CCI (<em>P</em><0.05).</p></div><div><h3>Conclusions</h3><p>Walkway trips and treadmill belt-accelerations elicit distinct muscle activation patterns. While walkway trips induced faster and larger muscle responses, treadmill belt-accelerations involved greater co-contraction. Therefore, treadmill belt-accelerations may not accurately simulate the muscle responses to trips.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"75 ","pages":"Article 102857"},"PeriodicalIF":2.5,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139554717","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

Exercise combined with electrical stimulation for the treatment of chronic ankle instability – A randomized controlled trial 运动结合电刺激治疗慢性踝关节不稳定--随机对照试验

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-12-30 DOI: 10.1016/j.jelekin.2023.102856

Uri Gottlieb, Roee Hayek, Jay R. Hoffman, Shmuel Springer

{"title":"Exercise combined with electrical stimulation for the treatment of chronic ankle instability – A randomized controlled trial","authors":"Uri Gottlieb, Roee Hayek, Jay R. Hoffman, Shmuel Springer","doi":"10.1016/j.jelekin.2023.102856","DOIUrl":"10.1016/j.jelekin.2023.102856","url":null,"abstract":"<div><h3>Purpose</h3><p><span>To compare the short, medium, and long-term effects of balance exercises combined with either peroneal neuromuscular electrical stimulation (NMES) or peroneal </span>transcutaneous electrical nerve stimulation<span> (TENS) on dynamic postural control and patient reported outcome measures (PROMs) in patients with chronic ankle instability (CAI).</span></p></div><div><h3>Methods</h3><p>Thirty-four participants with CAI were randomly assigned to a 12-session home based exercise program combined with NMES (Ex-NMES) or TENS (Ex- TENS). Baseline postural control was tested with the modified Star Excursion Balance Test (mSEBT) and time to stabilization (TTS) after a single-leg drop-jump. The self-reported function was measured using the Cumberland Ankle Instability Tool (CAIT), the Identification of Functional Ankle Instability (IdFAI), and the Sports subscale of the Foot and Ankle Ability Measure (FAAM<sub>Sport</sub>).</p></div><div><h3>Results</h3><p>Both groups showed significant improvements in all self-reported outcome measures at the 12-month follow-up. Subjects in the Ex-NMES group had significantly better IdFAI (-4.2 [95% CI −8.1, −0.2]) and FAAM<sub>Sport</sub> (13.7 [95% CI 2.2, 25.2]) scores at 6- and 12-month follow-up, respectively, compared to the Ex-TENS group. Medium to large between-group effect sizes were observed in self-reported functional outcomes and the mSEBT.</p></div><div><h3>Conclusion</h3><p>The consistent trend of improvement in self-reported functional outcomes when training is combined with NMES compared with training with TENS may indicate a potential benefit that should be further investigated as a treatment for patients with CAI.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102856"},"PeriodicalIF":2.5,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139069355","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

Postural stability assessment in expert versus amateur basketball players during optic flow stimulation 专家与业余篮球运动员在接受光流刺激时的姿势稳定性评估

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-12-27 DOI: 10.1016/j.jelekin.2023.102855

Alessandro Piras , Matteo Bertucco , Francesco Del Santo , Andrea Meoni , Milena Raffi

{"title":"Postural stability assessment in expert versus amateur basketball players during optic flow stimulation","authors":"Alessandro Piras , Matteo Bertucco , Francesco Del Santo , Andrea Meoni , Milena Raffi","doi":"10.1016/j.jelekin.2023.102855","DOIUrl":"10.1016/j.jelekin.2023.102855","url":null,"abstract":"<div><p>We evaluated the role of visual stimulation<span> on postural muscles and the changes in the center of pressure (CoP) during standing posture in expert and amateur basketball players. Participants were instructed to look at a fixation point presented on a screen during foveal, peripheral, and full field optic flow stimuli. Postural mechanisms and motor strategies were assessed by simultaneous recordings of stabilometric, oculomotor, and electromyographic data during visual stimulation. We found significant differences between experts and amateurs in the orientation of visual attention. Experts oriented attention to the right of their visual field, while amateurs to the bottom-right. The displacement in the CoP mediolateral direction showed that experts had a greater postural sway of the right leg, while amateurs on the left leg. The entropy-based data analysis of the CoP mediolateral direction exhibited a greater value in amateurs than in experts. The root-mean-square and the coactivation index analysis showed that experts activated mainly the right leg while amateurs the left leg. In conclusion, playing sports for years seems to have induced some strong differences in the standing posture between the right and left sides. Even during non-ecological visual stimulation, athletes maintain postural adaptations to counteract the body oscillation.</span></p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102855"},"PeriodicalIF":2.5,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139069289","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

Understanding the Biering-Sørensen test: Contributors to extensor endurance in young adults with and without a history of low back pain 了解比林-索伦森测试：有腰痛病史和无腰痛病史的年轻人伸展肌耐力的影响因素

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-12-27 DOI: 10.1016/j.jelekin.2023.102854

Jonathan Shaw , Jesse V. Jacobs , Linda R. Van Dillen , George J. Beneck , Jo Armour Smith

{"title":"Understanding the Biering-Sørensen test: Contributors to extensor endurance in young adults with and without a history of low back pain","authors":"Jonathan Shaw , Jesse V. Jacobs , Linda R. Van Dillen , George J. Beneck , Jo Armour Smith","doi":"10.1016/j.jelekin.2023.102854","DOIUrl":"10.1016/j.jelekin.2023.102854","url":null,"abstract":"<div><p>The Biering-Sørensen test is commonly used to assess paraspinal muscle<span> endurance. Research using a single repetition of the test has provided conflicting evidence for the contribution of impaired paraspinal muscle endurance to low back pain (LBP). This study investigated how Sørensen test duration, muscle activation, and muscle fatigability are affected by multiple repetitions of the test and determined predictors of Sørensen test duration in young adults with and without a history of LBP. Sixty-four young individuals performed three repetitions of the Sørensen test. Amplitude of activation and median frequency slope (fatigability) were calculated for the lumbar and thoracic paraspinals and hamstrings. Duration of the test was significantly less for the 3rd repetition in individuals with LBP. In individuals without LBP, test duration was predicted by fatigability of the lumbar paraspinals. In individuals with LBP, Sørensen test duration was predicted by fatigability of the hamstrings and amplitude of activation of the thoracic and lumbar paraspinals. Our findings demonstrate that it is necessary to amplify the difficulty of the Sørensen test to reveal impairments in young, active adults with LBP. Training programs aiming to improve lumbar paraspinal performance should monitor performance of other synergist muscles during endurance exercise.</span></p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102854"},"PeriodicalIF":2.5,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139069350","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

Effect of Exhaustive Exercise on Lumbopelvic-Hip Complex Stability, Muscle Activity, and Movement Patterns 力竭运动对腰骨盆-髋关节复合体稳定性、肌肉活动和运动模式的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-12-02 DOI: 10.1016/j.jelekin.2023.102852

Erika Zambarano , Neal Glaviano , Lucinda Bouillon , Grant Norte , Amanda Murray

{"title":"Effect of Exhaustive Exercise on Lumbopelvic-Hip Complex Stability, Muscle Activity, and Movement Patterns","authors":"Erika Zambarano , Neal Glaviano , Lucinda Bouillon , Grant Norte , Amanda Murray","doi":"10.1016/j.jelekin.2023.102852","DOIUrl":"10.1016/j.jelekin.2023.102852","url":null,"abstract":"<div><p><span>This study aimed to evaluate the effect of exhaustive exercise on lumbopelvic-hip complex (LPHC) muscle activity, stability, and single-leg squat kinematics. Twenty-two healthy participants (12 females, 23.5 ± 3.1 years) were recruited. LPHC stability was measured by number of errors committed during a seated trunk control test (STCT). Surface electromyography recorded muscle activity of rectus abdominis (RA), external oblique, internal oblique (IO), erector spinae, and gluteus medius during the STCT and single-leg squat, and was normalized to peak activity during the task. Two-dimensional motion analysis quantified frontal and sagittal plane kinematics of the trunk, hip, and knee. Following exhaustive exercise, STCT performance worsened (number of errors: pre: 5.5 (interquartile range (IQR) = 1.4–9.0), post: 8.0 (IQR = 3.6–11.3), </span><em>p</em> = 0.026.), RA activity increased during the single-leg squat (pre: 42.1 (IQR = 33.6–48.5)%, post: 61.1 (IQR = 39.4–156.7 %, <em>p</em> =.004), and participants displayed less hip and knee flexion (hip: pre: 72.4 ± 22.1°; post: 66.2 ± 22.5°, <em>p</em> =.049; knee: pre: 72.4 ± 15.4°; post: 67.4 ± 18.2°, <em>p</em> =.005). Full-body exhaustive exercise negatively affected isolated LPHC stability and resulted in greater RA activity during the single-leg squat. Hip and knee flexion decreased during a single-leg squat after exhaustive exercise which could indicate decreased athletic performance, but changes in the quality of movement during other tasks should be further investigated.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102852"},"PeriodicalIF":2.5,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138503857","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

Using force or EMG envelope as feedback signal for motor control system 采用力或肌电包络作为电机控制系统的反馈信号

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-11-30 DOI: 10.1016/j.jelekin.2023.102851

M. Cogliati, A. Cudicio, C. Orizio

{"title":"Using force or EMG envelope as feedback signal for motor control system","authors":"M. Cogliati, A. Cudicio, C. Orizio","doi":"10.1016/j.jelekin.2023.102851","DOIUrl":"https://doi.org/10.1016/j.jelekin.2023.102851","url":null,"abstract":"<div><h3>Purpose</h3><p>This work studied muscle neuro-mechanics during symmetrical up-going ramp (UGR) and down-going ramp (DGR). Aim: to evaluate during the modulation of muscular action the outcome of force feedback (FF) or neural feedback (NF) on the behavior of the trailing signals - i.e. the EMG envelope (eEMG) for FF or force signal for NF.</p></div><div><h3>Method</h3><p>Subjects: 20. Investigated muscles: dorsal interosseous (FDI) and tibialis anterior (TA). Detected signals: force and EMG. Visual feedback: force (FF), eEMG (NF). Effort triangles: ramps duration 7.5 s, vertex at 50 and 100 % of the maximal voluntary action. Eventually, each subject performed FF50%, FF100%, NF50% and NF100% per each muscle. In each condition the areas beneath the force and eEMG signals were computed to calculate the ratios between the DGR and UGR values during the different tasks (force area DGR / force area UGR; eEMG area DGR / eEMG area UGR). Electro-mechanical coupling efficiency (EMCE) was estimated through the eEMG area / force area ratio for both UGR and DGR in each condition.</p></div><div><h3>Results</h3><p>a) FF. FDI: eEMG area ratio was 0.84 ± 0.15 and 0.73 ± 0.17 for FF50% and FF100%, respectively. TA: eEMG area ratio was 0.88 ± 0.11 and 0.91 ± 0.17 for FF50% and FF100%, respectively. b) NF: FDI: force area ratio was 1.18 ± 0.13 and 1.17 ± 0.13 for NF50% and NF100%, respectively. TA: force area ratio was 1.17 ± 0.21 and 1.07 ± 0.19 for NF50% and NF100%, respectively. c) DGR EMCE was greater than UGR EMCE in all four tasks.</p></div><div><h3>Conclusion</h3><p>The influence of UGR on deployed EMCE in the following force decrement phase underpins the changes of trailing signals area during DGR. This underlines the necessity of a careful evaluation of the features of FF or NF for experimental studies or rehabilitation purposes involving the motor control system.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102851"},"PeriodicalIF":2.5,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641123001104/pdfft?md5=d3a864c933c65fbcad5e5f2b22f33c18&pid=1-s2.0-S1050641123001104-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138480128","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

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

Journal of Electromyography and Kinesiology Pub Date : 2023-11-30 DOI: 10.1016/j.jelekin.2023.102850

Giacomo Valli , Paul Ritsche , Andrea Casolo , Francesco Negro , Giuseppe De Vito

{"title":"Tutorial: Analysis of central and peripheral motor unit properties from decomposed High-Density surface EMG signals with openhdemg","authors":"Giacomo Valli , Paul Ritsche , Andrea Casolo , Francesco Negro , Giuseppe De Vito","doi":"10.1016/j.jelekin.2023.102850","DOIUrl":"10.1016/j.jelekin.2023.102850","url":null,"abstract":"<div><p>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 <em>openhdemg</em>, 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. <em>openhdemg</em> 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.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102850"},"PeriodicalIF":2.5,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641123001098/pdfft?md5=d6ba05604165bdb8fd88e04527b14cf1&pid=1-s2.0-S1050641123001098-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138503856","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

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

Journal of Electromyography and Kinesiology 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

{"title":"Falling decreased anterior cruciate ligament loading variables during single-leg landings after mid-flight external trunk perturbation","authors":"Yu Song , Ling Li , Jacob Layer , Gerwyn Hughes , Derek Smith , Margaret Wilson , Qin Zhu , Boyi Dai","doi":"10.1016/j.jelekin.2023.102849","DOIUrl":"10.1016/j.jelekin.2023.102849","url":null,"abstract":"<div><p>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<span> 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.</span></p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"74 ","pages":"Article 102849"},"PeriodicalIF":2.5,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138503858","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

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

Journal of Electromyography and Kinesiology 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

{"title":"High-density surface electromyography allows to identify risk conditions and people with and without low back pain during fatiguing frequency-dependent lifting activities","authors":"Tiwana Varrecchia , Alberto Ranavolo , Giorgia Chini , Alessandro Marco De Nunzio , Francesco Draicchio , Eduardo Martinez-Valdes , Deborah Falla , Silvia Conforto","doi":"10.1016/j.jelekin.2023.102839","DOIUrl":"10.1016/j.jelekin.2023.102839","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"73 ","pages":"Article 102839"},"PeriodicalIF":2.5,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72212075","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}

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