Journal of Electromyography and Kinesiology最新文献

The effect of tongue-to-palate on deep neck flexor activity 舌对腭对颈深屈肌活动的影响

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-10-10 DOI: 10.1016/j.jelekin.2024.102938

{"title":"The effect of tongue-to-palate on deep neck flexor activity","authors":"","doi":"10.1016/j.jelekin.2024.102938","DOIUrl":"10.1016/j.jelekin.2024.102938","url":null,"abstract":"<div><div>Deep neck flexor (DNF) muscles contribute to cervical stability and proprioception. Reduced muscle strength and endurance lead to faulty movement patterns, muscle imbalances, and dysfunction. Potentially, the orofacial muscles contribute to cervical strength by providing stability through muscular connections. This study examined effects of tongue muscle activity on cervical spine muscular stiffness. Twenty-three healthy subjects assumed three supine positions [at rest (AR), chin tuck (CT), and head lift (HL)] with and without tongue-to-palate pressure. The DNF stiffness was measured using shear wave elastography. Without tongue-to-palate, stiffness increased with CT and HL compared to AR (<em>p</em> <0.001) but not between CT and HL (<em>p</em> = 0.22). Tongue-to-palate increased stiffness AR (<em>p</em> <0.001) but not during CT (<em>p</em> = 0.95) or HL (<em>p</em> = 0.67). Stiffness levels between the AR and HL conditions during tongue-to-palate performance did not differ (<em>p</em> = 0.734), but CT stiffness was significantly greater than AR (<em>p</em> = 0.029) with tongue-to-palate. Tongue-to-palate AR increases DNF stiffness to a similar level as HL with or without tongue-to-palate, while CT with or without tongue-to-palate resulted in the highest stiffness levels. Tongue-to-palate pressure AR or with CT performance may be alternatives to HL strengthening in healthy necks. This may be a useful strategy to increase cervical stability during loads on the cervical spine.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442063","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

Upper extremity neuromuscular function can distinguish between individuals with and without glenohumeral labral repair 上肢神经肌肉功能可区分盂唇修复和未修复的个体

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-09-24 DOI: 10.1016/j.jelekin.2024.102935

{"title":"Upper extremity neuromuscular function can distinguish between individuals with and without glenohumeral labral repair","authors":"","doi":"10.1016/j.jelekin.2024.102935","DOIUrl":"10.1016/j.jelekin.2024.102935","url":null,"abstract":"<div><div>The purpose of this study was to determine whether common measures of neuromuscular function could distinguish injury status indicated by group membership (glenohumeral labral repair, uninjured controls). 16 individuals with glenohumeral labral repair (24.1 ± 5.0 years, 36.7 ± 33.3 months after surgery) and 14 uninjured controls (23.8 ± 2.7 years) volunteered. We measured mass-normalized shoulder abduction and wrist flexion maximal voluntary isometric contraction torque (Nm/kg), motoneuron pool excitability of the flexor carpi radialis (Hoffmann reflex), corticospinal excitability of the upper trapezius, middle deltoid, and flexor carpi radialis (active motor threshold [%]) bilaterally. Receiver operator characteristic curve analyses were performed to determine if each outcome could distinguish injury status along with their outcome thresholds. Binary logistic regression was used to determine the accuracy of classification for each outcome. Our results suggest shoulder abduction torque symmetry (≤95.5 %) and corticospinal excitability for the upper trapezius (≥41.0 %) demonstrated excellent diagnostic utility. Shoulder abduction torque (≤0.71 Nm/kg) and motoneuron pool excitability (≤0.23) demonstrated acceptable diagnostic utility. Shoulder abduction torque symmetry alone was the strongest indicator, and classified injury status with 90.0 % accuracy (<em>p</em> < 0.01). Overall, symmetric shoulder abduction strength most accurately distinguished individuals’ injury status, suggesting the utility of bilateral assessment in this population.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357645","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

Do maximal isometric trunk tasks produce maximum activity in latissimus dorsi? 最大等距躯干任务是否会产生背阔肌的最大活动量？

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-09-24 DOI: 10.1016/j.jelekin.2024.102933

{"title":"Do maximal isometric trunk tasks produce maximum activity in latissimus dorsi?","authors":"","doi":"10.1016/j.jelekin.2024.102933","DOIUrl":"10.1016/j.jelekin.2024.102933","url":null,"abstract":"<div><h3>Introduction</h3><div>Electromyography (EMG) studies investigating latissimus dorsi activity during trunk tasks have reported high activation levels and described latissimus dorsi as an important contributor to trunk movement and stability. However, the normalisation of EMG data in these studies is inconsistent with some normalising to shoulder tasks and a majority normalising to trunk tasks. Therefore, this study aimed to compare commonly used shoulder and trunk normalisation tasks to determine if trunk tasks produce maximum activity in latissimus dorsi.</div></div><div><h3>Methods</h3><div>Ten asymptomatic participants completed maximal isometric trunk (extension, ipsilateral rotation and ipsilateral lateral flexion) and shoulder (extension and internal rotation) tasks while recording EMG signals from right latissimus dorsi using surface and indwelling electrodes. The signals were high-pass filtered, rectified then low-pass filtered to obtain an EMG linear envelope to represent muscle activity levels. The maximum activity levels across tasks were compared for each electrode type.</div></div><div><h3>Results</h3><div>Shoulder extension elicited significantly higher (>1.5 times) latissimus dorsi activity levels when recorded using both surface and indwelling electrodes compared to other shoulder and trunk tasks.</div></div><div><h3>Conclusion</h3><div>Maximal isometric trunk tasks do not produce maximal latissimus dorsi activity and therefore when used for normalisation purposes potentially overestimate the contribution of latissimus dorsi to trunk tasks.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333177","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

High-density EMG reveals atypical spatial activation of the gastrocnemius during walking in adolescents with Cerebral Palsy 高密度肌电图显示脑瘫青少年行走时腓肠肌的非典型空间激活。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-09-20 DOI: 10.1016/j.jelekin.2024.102934

{"title":"High-density EMG reveals atypical spatial activation of the gastrocnemius during walking in adolescents with Cerebral Palsy","authors":"","doi":"10.1016/j.jelekin.2024.102934","DOIUrl":"10.1016/j.jelekin.2024.102934","url":null,"abstract":"<div><div>Children with Cerebral Palsy (CP) exhibit less-selective, simplified muscle activation during gait due to injury of the developing brain. Abnormal motor unit recruitment, altered excitation-inhibition balance, and muscle morphological changes all affect the CP electromyogram. High-density surface electromyography (HDsEMG) has potential to reveal novel manifestations of CP neuromuscular pathology and functional deficits by assessing spatiotemporal details of myoelectric activity. We used HDsEMG to investigate spatial-EMG distribution and temporal-EMG complexity of gastrocnemius medialis (GM) muscle during treadmill walking in 11 adolescents with CP and 11 typically developed (TD) adolescents.</div><div>Our results reveal more-uniform spatial-EMG amplitude distribution across the GM in adolescents with CP, compared to distal emphasis in TD adolescents. More-uniform spatial-EMG was associated with stronger ankle co-contraction and spasticity. CP adolescents exhibited a non-significant trend towards elevated EMG-temporal complexity. Homogenous spatial distribution and disordered temporal evolution of myoelectric activity in CP suggests less-structured and desynchronized recruitment of GM motor units, in combination with muscle morphological changes. Using HDsEMG, we uncovered novel evidence of atypical spatiotemporal activation during gait in CP, opening paths towards deeper understanding of motor control deficits and better characterization of changes in muscular activation from interventions.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142395570","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

Effects of biofeedback and strength training interventions on neck-shoulder sensory-motor responses among visual display unit users. A narrative review 生物反馈和力量训练干预对视觉显示器使用者颈肩感觉运动反应的影响。叙述性综述

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-09-20 DOI: 10.1016/j.jelekin.2024.102936

{"title":"Effects of biofeedback and strength training interventions on neck-shoulder sensory-motor responses among visual display unit users. A narrative review","authors":"","doi":"10.1016/j.jelekin.2024.102936","DOIUrl":"10.1016/j.jelekin.2024.102936","url":null,"abstract":"<div><div>Workplace biofeedback and strength training interventions have been conducted to treat neck-shoulder pain among visual display unit users. Biofeedback has been given using surface electromyography, mechanomyography, oculometrics, and spinal posture to promote either muscle relaxation, muscle activation or change in posture. Strength training has been performed mostly using basic exercise equipment according to various progression principles. These two types of interventions would thus result in increased ability to cope with physical workload or improved individual resources. In this narrative review, we analyzed the design, methods, and results of the retrieved studies on neck-shoulder sensory-motor responses among visual display unit users. A few studies have reported both an immediate decrease in neck-shoulder pain and an improvement after the end of the intervention following biofeedback, often based on surface electromyography, and strength training interventions targeting the shoulder girdle. Biofeedback and strength training interventions can respectively modify ability to cope with physical workload and individual resources resulting in increased physical capacity among visual display unit users. The long-term effects and the applicability of these approaches remain to be demonstrated at workplace settings. Future studies could combine both modalities to increase versatility of the interventions.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000804/pdfft?md5=c196347042d617b471f7f355c688e591&pid=1-s2.0-S1050641124000804-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315935","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

Less Pain, but no changes in maximal inclination angles during an overhead reach task following local anesthetic in patients with ongoing shoulder pain 局部麻醉后，持续肩痛患者在高空伸手任务中的疼痛减轻，但最大倾斜角度没有变化

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-09-08 DOI: 10.1016/j.jelekin.2024.102932

{"title":"Less Pain, but no changes in maximal inclination angles during an overhead reach task following local anesthetic in patients with ongoing shoulder pain","authors":"","doi":"10.1016/j.jelekin.2024.102932","DOIUrl":"10.1016/j.jelekin.2024.102932","url":null,"abstract":"<div><p>This multicenter observational study aimed to assess how pain reduction, induced by local anesthesia, affects the relative angular contributions of the shoulder girdle and trunk to the maximal angular performance during a semi-constrained overhead reach task in patients with ongoing shoulder pain. Twenty-nine individuals (age 59.0 SD 12.8 years;16-male) with symptomatic shoulders were administered corticosteroid and lidocaine injections by their attending orthopedic surgeon. Immediately before and after the injections, participants reached for a target on the ceiling ten times as high as possible while their pain levels, shoulder, and trunk movements were recorded. The analysis revealed that there was a significant reduction in pain following the injections. However, there were no significant differences in maximum shoulder and trunk inclination angles between the pre- and post-injection conditions. Notably, there were slight but statistically significant alterations in humeroscapular kinematics during the initial phase of arm elevation following the injections. In conclusion, acute pain relief following local anesthetics is not associated with immediate alterations in maximum shoulder girdle and trunk inclination angles during a semi-constrained overhead reach task in patients with ongoing shoulder pain. However, there are signs of small alterations in humeroscapular kinematics during the initial phase of arm elevation.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229568","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

Upper arm muscle activity is influenced by both forearm posture and wrist exertion direction during isometric wrist flexion and extension 在手腕等长屈伸过程中，上臂肌肉活动受前臂姿势和手腕用力方向的影响。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-08-30 DOI: 10.1016/j.jelekin.2024.102919

{"title":"Upper arm muscle activity is influenced by both forearm posture and wrist exertion direction during isometric wrist flexion and extension","authors":"","doi":"10.1016/j.jelekin.2024.102919","DOIUrl":"10.1016/j.jelekin.2024.102919","url":null,"abstract":"<div><p>The purpose of this study was to determine how wrist exertion direction and forearm posture independently influence upper arm muscle activity during isometric wrist contractions. Surface electromyography was recorded from three muscles of the upper-limb: biceps brachii, triceps brachii, and brachioradialis. Participants were seated with their forearm supported in one of three postures (supinated/neutral/pronated) with an adjustable force transducer that could be placed either above, below, or to the right/left of the participant’s hand. Participants performed randomized trials of isometric wrist flexion or extension at five relative intensities: 20, 40, 60, 80, or 100% of maximal force. Trials lasted 4.5 s and both wrist force and electromyography data were assessed. In general, the elbow flexors were more active during wrist flexion, while the triceps were more active in wrist extension, but this pattern reversed in certain forearm postures and wrist exertion directions. Both forearm posture and wrist exertion direction resulted in unique effects on upper arm muscle activity. These findings suggest that muscle activity of the upper arm muscles is influenced independently by both posture and force direction, which should be carefully considered by both motor control specialists and ergonomists.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000634/pdfft?md5=281e257b6711e720a86d2a28782992bf&pid=1-s2.0-S1050641124000634-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142147011","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

Altered muscle fibre activation in an antagonistic muscle pair due to perturbed afferent feedback caused by blood flow restriction 血流受限引起的传入反馈紊乱导致一对拮抗肌的肌纤维激活发生变化。

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-08-27 DOI: 10.1016/j.jelekin.2024.102922

{"title":"Altered muscle fibre activation in an antagonistic muscle pair due to perturbed afferent feedback caused by blood flow restriction","authors":"","doi":"10.1016/j.jelekin.2024.102922","DOIUrl":"10.1016/j.jelekin.2024.102922","url":null,"abstract":"<div><h3>Purpose</h3><p>This study aimed to better understand the coping strategy of the neuromuscular system under perturbed afferent feedback. To this end, the neuromechanical effects of transient blood flow restriction (BFR) compared to atmospheric pressure were investigated in an antagonistic muscle pair.</p></div><div><h3>Methods</h3><p>Perceived discomfort and neuromechanical parameters (torque and high-density electromyography) were recorded during submaximal isometric ankle dorsiflexion before, during and after BFR. The tibialis anterior and gastrocnemius lateralis muscles were studied in 14 healthy young adults.</p></div><div><h3>Results</h3><p>Discomfort increased during BFR and decreased to baseline level afterwards. The exerted torque and the co-activation index remained constant, whereas the EMG signal energy increased significantly during BFR. Coherence analysis of the delta band remained constant, whereas the alpha band shows an increase during BFR. Median frequency and muscle fibre conduction velocity showed a positive trend during the first minutes of BFR before significantly decreasing. Both parameters exceeded baseline values after cuff deflation.</p></div><div><h3>Conclusion</h3><p>Perturbed afferent feedback leads to altered neuromechanical parameters. We assume that increased central drive is required to maintain force output, resulting in changed muscle fibre activity. Glycolytic fast-switch fibres are only active for a short time due to oxygen deprivation and hyperacidity, but fatigue effects predominate in the long term.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S105064112400066X/pdfft?md5=e50dd5595527ab6c2865fb3878dd4efa&pid=1-s2.0-S105064112400066X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142156776","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

Relation between stretch and activation of the medial gastrocnemius muscle during gait in children with cerebral palsy compared to typically developing children 与发育正常的儿童相比，脑瘫儿童在步态过程中内侧腓肠肌的伸展和激活之间的关系

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-08-26 DOI: 10.1016/j.jelekin.2024.102921

{"title":"Relation between stretch and activation of the medial gastrocnemius muscle during gait in children with cerebral palsy compared to typically developing children","authors":"","doi":"10.1016/j.jelekin.2024.102921","DOIUrl":"10.1016/j.jelekin.2024.102921","url":null,"abstract":"<div><p>Stretch hyperreflexia is often a target for treatment to improve gait in children with spastic cerebral palsy (CP). However, the presence of stretch hyperreflexia during gait remains debated. Therefore, we assessed the relation between gastrocnemius medialis muscle-tendon stretch and muscle activation during gait in children with CP compared to typically developing (TD) children. 3D gait analysis including electromyography (EMG) and dynamic ultrasound was carried out to assess, respectively gastrocnemius medialis activation and fascicle, belly, and tendon stretch during treadmill walking. Musculotendon-unit stretch was also estimated using OpenSim. Ratios of EMG/peak lengthening velocities and accelerations were compared between CP and TD. Velocity and acceleration peaks prior to EMG peaks were qualitatively assessed. EMG/velocity and EMG/acceleration ratios were up to 500% higher for CP (n = 14) than TD (n = 15) for most structures. Increased late swing muscle activation in CP was often preceded by fascicle and musculotendon-unit peak lengthening velocity, and early stance muscle activation by peaks in multiple structures. Increased muscle activation in CP is associated with muscle-tendon stretch during gait. Concluding, late swing muscle activation in CP appears velocity-dependent, whereas early stance activation can be velocity- and acceleration-dependent. These insights into stretch reflex mechanisms during gait can assist development of targeted interventions.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000658/pdfft?md5=0e745d82ae07b2978ab58f295932f24c&pid=1-s2.0-S1050641124000658-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274715","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

Effects of unilateral and bilateral lower extremity fatigue on static stance and postural adjustments response to the externally initiated perturbation 单侧和双侧下肢疲劳对静态姿态和姿势调整对外部启动扰动的反应的影响

IF 2 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2024-08-26 DOI: 10.1016/j.jelekin.2024.102918

{"title":"Effects of unilateral and bilateral lower extremity fatigue on static stance and postural adjustments response to the externally initiated perturbation","authors":"","doi":"10.1016/j.jelekin.2024.102918","DOIUrl":"10.1016/j.jelekin.2024.102918","url":null,"abstract":"<div><p>The study investigated the effects of unilateral and bilateral lower extremity fatigue on both postural stability and postural adjustments. Fourteen young male subjects performed unilateral and bilateral dynamic lower extremity pedaling exercises with 5 sets of 20 times at 50 % maximum voluntary contraction. Center of pressure (COP) signals were recorded before and after the fatigue exercise. Electromyography activities of six trunk and leg muscles were recorded and analyzed during the anticipatory (APAs) and compensatory (CPAs) postural adjustments. The results showed that both fatiguing exercises caused an increase in COP and larger APAs and CPAs in the rectus femoris and tibialis anterior during externally initiated perturbation. However, the observed indicators showed no clear difference between unilateral and bilateral fatigue. These results validated that when enlarged APAs were not sufficient to resist the external perturbation, the central nervous system increased the strength of CPAs to maintain the stability of the body. These findings provided a perspective on the association between APAs and CPAs, which may apply to the athletic training or rehabilitation on postural control.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1050641124000622/pdfft?md5=a5db515609f85a04676616bc67d95cb7&pid=1-s2.0-S1050641124000622-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075804","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