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

Motor point heatmap guide for neuromuscular electrical stimulation of the quadriceps muscle 用于股四头肌神经肌肉电刺激的运动点热图指南

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102771

J. Flodin , R. Juthberg , PW. Ackermann

{"title":"Motor point heatmap guide for neuromuscular electrical stimulation of the quadriceps muscle","authors":"J. Flodin , R. Juthberg , PW. Ackermann","doi":"10.1016/j.jelekin.2023.102771","DOIUrl":"10.1016/j.jelekin.2023.102771","url":null,"abstract":"<div><h3>Purpose</h3><p>To create an anatomical chart that indicates the probability of finding a motor point (MP) in different areas of the quadriceps muscle.</p></div><div><h3>Methods</h3><p>On 31 healthy adults, the individual anatomy of the vastus medialis (VM), rectus femoris (RF) and vastus lateralis (VL) was determined using ultrasound. Thereafter, a 3 Hz neuromuscular electrical stimulation (NMES) MP-search with a MP-pen was performed. The thigh anatomy was normalized and divided into 112 (8x14) 3x3cm areas, and the probability of finding a MP in the different areas was calculated to create a MP heat-map.</p></div><div><h3>Results</h3><p>The heat-map displayed the two best 3x3cm areas, over VL and VM respectively, each with a probability greater than 50% of finding a MP and a higher probability compared to all other areas (p <.05). RF exhibited two areas with a 29% probability of finding a MP. A higher number of MPs on the quadriceps, mean (±SD) 9.4 ± 1, was in regression analysis found to be significantly associated with two independent factors higher physical activity level and lower body fat (R<sup>2</sup> = 0.42, p=<.0001).</p></div><div><h3>Conclusion</h3><p>Large inter-individual variations in location, and number of MPs were found, but the heat-map displayed areas with higher probability of finding a MP and can be used to facilitate NMES-application.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9571156","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 effect of EMG biofeedback training on muscle activation in an impingement population 肌电生物反馈训练对撞击人群肌肉激活的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102772

Eliot J. Mackay, Nathan J. Robey, David N. Suprak, Harsh H. Buddhadev, Jun G. San Juan

{"title":"The effect of EMG biofeedback training on muscle activation in an impingement population","authors":"Eliot J. Mackay, Nathan J. Robey, David N. Suprak, Harsh H. Buddhadev, Jun G. San Juan","doi":"10.1016/j.jelekin.2023.102772","DOIUrl":"10.1016/j.jelekin.2023.102772","url":null,"abstract":"<div><p><span>Subacromial impingement syndrome<span> (SAIS) is one of the most diagnosed causes of pain in the upper extremity. The purpose of this study was to investigate muscle activity between asymptomatic and SAIS shoulders on the same subject while understanding the effectiveness of EMG </span></span>biofeedback training (EBFB) on bilateral overhead movements. Ten participants (7 male), that tested positive for 2/3 SAIS clinical tests, volunteered for the study. Bilateral muscle activity was measured via electrodes on the upper trapezius (UT), lower trapezius (LT), serratus anterior (SA), and lumbar paraspinals (LP). Participants performed bilateral scapular plane overhead movements before and after EBFB. EBFB consisted of 10 bilateral repetitions of I, W, T, and Y exercises focused on reducing UT and increasing LT and SA activity. Prior to EBFB, no significant difference in muscle activity was present between sides. A significant main effect of time indicated that after EBFB both sides exhibited reduced UT activity at 60° (p = 0.003) and 90° (p = 0.036), LT activity was increased at all measured humeral angles (p < 0.0005), and SA muscle activity was increased at 110° (p = 0.001). EBFB in conjunction with scapular based exercise effectively alters muscle activity of asymptomatic and symptomatic scapular musculature.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9574979","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: 2

Comparison of EMG activity in shank muscles between individuals with and without chronic ankle instability when running on a treadmill 有和没有慢性踝关节不稳定的人在跑步机上跑步时小腿肌肉肌电活动的比较

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102773

Abdulkerim Darendeli , Hayri Ertan , Mutlu Cuğ , Erik Wikstrom , Roger Maro Enoka

{"title":"Comparison of EMG activity in shank muscles between individuals with and without chronic ankle instability when running on a treadmill","authors":"Abdulkerim Darendeli , Hayri Ertan , Mutlu Cuğ , Erik Wikstrom , Roger Maro Enoka","doi":"10.1016/j.jelekin.2023.102773","DOIUrl":"10.1016/j.jelekin.2023.102773","url":null,"abstract":"<div><p>Changes in movement capabilities after an injury to the ankle may impose adaptations in the peripheral and central nervous system<span><span>. The purpose of our study was to compare the electromyogram (EMG) profile of ankle stabilizer muscles and stride-time variation during treadmill running in individuals with and without chronic ankle instability (CAI). Recreationally active individuals with (n = 12) and without (n = 15) CAI ran on a treadmill at two speeds. EMG activity of four shank muscles as well as tibial acceleration data were recorded during the running trials. EMG amplitude, timing of EMG peaks, and variation in stride-time were analyzed from 30 consecutive stride cycles. EMG data were time-normalized to stride duration and amplitude was normalized relative to the appropriate maximal voluntary contraction (MVC) task. Individuals with CAI had similar EMG amplitudes and peak timing, but an altered order of peak EMG activity in ankle stabilizer muscles, a significantly greater EMG amplitude for PL with an increase in speed, and a greater stride-time variability during treadmill running compared with individuals who had no history of </span>ankle sprains. The results of our study indicate that individuals with CAI exhibit altered activation strategies for ankle stabilizer muscles when running on a treadmill.</span></p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9571978","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: 3

A reliability study on the cumulative averaging method for estimating effective stimulus time in vibration studies 振动研究中估算有效激励时间的累积平均法的可靠性研究

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102768

Aysegül Kilic , Gülsah Soytürk , Ayse Karaoglu , Betilay Topkara Arslan , Ilhan Karacan , Kemal S. Türker

{"title":"A reliability study on the cumulative averaging method for estimating effective stimulus time in vibration studies","authors":"Aysegül Kilic , Gülsah Soytürk , Ayse Karaoglu , Betilay Topkara Arslan , Ilhan Karacan , Kemal S. Türker","doi":"10.1016/j.jelekin.2023.102768","DOIUrl":"10.1016/j.jelekin.2023.102768","url":null,"abstract":"<div><p>Finding the reflex circuitry responsible for high-frequency vibration-induced muscle contraction takes work. The main challenge is to determine the effective stimulus time (EST) point at which continuous (sinusoidal) stimulation (i.e., vibration) triggers the reflex response. A novel “cumulated averaging method” has been previously proposed for estimating the EST point. In the current study, we aimed to test the reliability of the cumulated average method. We used five different whole-body vibration (WBV) frequencies in two experiments. The consistency between the EST points estimated from the first and second experiments was analysed with the intraclass correlation (ICC) and technical error of measurement (TEM). The ICC coefficient with 95% CI for the EST point estimation was 0.988 (0.950–0.997). The relative TEM was 1.3%. We concluded that the cumulated average method is highly reliable in estimating the effective stimulus time point for high-frequency continuous sinusoidal signals.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9570677","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

Variation of muscle recruitment during exercises performed below horizontal arm elevation that target the lower trapezius: A repeated measures cross-sectional study on asymptomatic individuals 针对下斜方肌的水平臂抬高以下运动中肌肉募集的变化：一项针对无症状个体的重复测量横断面研究

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102777

Jonathan F. Garcia , Cristina Herrera , Jacquelyn M. Maciukiewicz , Reagan E. Anderson , Daniel C. Ribeiro , Clark R. Dickerson

{"title":"Variation of muscle recruitment during exercises performed below horizontal arm elevation that target the lower trapezius: A repeated measures cross-sectional study on asymptomatic individuals","authors":"Jonathan F. Garcia , Cristina Herrera , Jacquelyn M. Maciukiewicz , Reagan E. Anderson , Daniel C. Ribeiro , Clark R. Dickerson","doi":"10.1016/j.jelekin.2023.102777","DOIUrl":"10.1016/j.jelekin.2023.102777","url":null,"abstract":"<div><p><span><span>The gold standard exercise for recruitment of the lower trapezius is the Y prone exercise which is performed above 90° of shoulder elevation. However, clinicians often prescribe exercises that avoid high elevation postures during early stages of rehabilitation. Comparatively little data exists on relative muscle recruitment during lower arm elevation exercises. This study examined the EMG activity of four </span>shoulder girdle muscles during four exercises accomplished below 90° of shoulder elevation and compared them to the Y prone while considering sex effects. Variance across exercises of the ratio between upper trapezius and lower trapezius was also explored. 32 healthy participants completed standardized muscle-specific MVCs and two repetitions of each exercise. The side lying external rotation and the wall slide exercises produced the highest peak EMG for the lower trapezius, both 33 and 29% lower than the Y Prone. For the upper trapezius to lower trapezius ratio, the side lying external rotation elicited the lowest value, followed by the Y prone and wall slide (53 and 59% respectively higher). Sex influenced some EMG values, typically interacting with exercise type. Thus, side lying external rotation and the wall slide are recommended for targeting the lower </span>trapezius muscle during early rehabilitation.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9572190","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

Skeletal muscle models composed of motor units: A review 由运动单元组成的骨骼肌模型：综述

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102774

Rositsa Raikova , Piotr Krutki , Jan Celichowski

{"title":"Skeletal muscle models composed of motor units: A review","authors":"Rositsa Raikova , Piotr Krutki , Jan Celichowski","doi":"10.1016/j.jelekin.2023.102774","DOIUrl":"10.1016/j.jelekin.2023.102774","url":null,"abstract":"<div><p>The mathematical muscle models should include several aspects of muscle structure and physiology. First, muscle force is the sum of forces of multiple motor units (MUs), which have different contractile properties and play different roles in generating muscle force. Second, whole muscle activity is an effect of net excitatory inputs to a pool of motoneurons innervating the muscle, which have different excitability, influencing MU recruitment. In this review, we compare various methods for modeling MU twitch and tetanic forces and then discuss muscle models composed of different MU types and number. We first present four different analytical functions used for twitch modeling and show limitations related to the number of twitch describing parameters. We also show that a nonlinear summation of twitches should be considered in modeling tetanic contractions. We then compare different muscle models, most of which are variations of Fuglevand’s model, adopting a common drive hypothesis and the size principle. We pay attention to integrating previously developed models into a consensus model based on physiological data from <em>in vivo</em> experiments on the rat medial gastrocnemius muscle and its respective motoneurons. Finally, we discuss the shortcomings of existing models and potential applications for studying MU synchronization, potentiation, and fatigue.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9572476","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: 3

Association between force fluctuation during isometric ankle abduction and variability of neural drive in peroneus muscles 等长踝关节外展过程中的力波动与腓骨肌神经驱动变化的关系

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102780

Shun Kunugi , Tetsuya Hirono , Akane Yoshimura , Aleš Holobar , Kohei Watanabe

{"title":"Association between force fluctuation during isometric ankle abduction and variability of neural drive in peroneus muscles","authors":"Shun Kunugi , Tetsuya Hirono , Akane Yoshimura , Aleš Holobar , Kohei Watanabe","doi":"10.1016/j.jelekin.2023.102780","DOIUrl":"10.1016/j.jelekin.2023.102780","url":null,"abstract":"<div><p><span>Analyzing motor unit<span> (MU) activities of peroneus muscles<span> may reveal the causes of force control deficits of ankle eversion. This study aimed to examine peroneus muscles’ MU discharge characteristics and associations between force fluctuation and variability of the neural drive in healthy participants. Thirty-one healthy males participated in this study. MU activities were identified from high-density surface electromyography of peroneus muscles during ankle eversion at 15 and 30% of maximal voluntary contraction (MVC). Participants increased the contraction level until reaching the target and held it for 15 s. The central 10 s of the hold phase were used for analysis. A cumulative spike train (CST) was calculated using MU firings. Variabilities of the force and CST are represented by the coefficient of variation (CoV). Spearman’s rank correlation coefficient was used to assess the association between CoV of force and CoV of CST. For 15 and 30 % MVC trials, CoV of force was 1.86 ± 1.59 and 1.57 ± 1.26%, and CoV of CST was 5.01 ± 3.24 and 4.51 ± 2.78%, respectively. The correlation was significant at 15% (rho = 0.27, </span></span></span><em>p</em> < 0.001) and 30% (rho = 0.32, <em>p</em> < 0.001) MVC. Our findings suggest that in peroneus muscles, force fluctuation weakly to moderately correlates with neural drive variability.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9563273","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

Walking slope and heavy backpack loads affect torso muscle activity and kinematics 行走斜坡和沉重的背包负荷会影响躯干肌肉活动和运动学

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102769

Jordan T. Sturdy , Hedaya N. Rizeq , Amy Silder , Pinata H. Sessoms , Anne K. Silverman

{"title":"Walking slope and heavy backpack loads affect torso muscle activity and kinematics","authors":"Jordan T. Sturdy , Hedaya N. Rizeq , Amy Silder , Pinata H. Sessoms , Anne K. Silverman","doi":"10.1016/j.jelekin.2023.102769","DOIUrl":"10.1016/j.jelekin.2023.102769","url":null,"abstract":"<div><p>The independent effects of sloped walking or carrying a heavy backpack on posture and torso muscle activations have been reported. While the combined effects of sloped walking and backpack loads are known to be physically demanding, how back and abdominal muscles adapt to walking on slopes with heavy load is unclear. This study quantified three-dimensional pelvis and torso kinematics and muscle activity from longissimus, iliocostalis, rectus abdominis, and external oblique during walking on 0° and ± 10° degree slopes with and without backpack loads using two different backpack configurations (hip-belt assisted and shoulder-borne). Iliocostalis activity was greater during downhill and uphill compared to level walking, but longissimus was only greater during uphill. Rectus abdominis activity was greater during downhill and uphill compared to level, while external oblique activity decreased as slopes progressed from down to up. Longissimus, but not iliocostalis, activity was reduced during both backpack configurations compared to walking with no pack. Hip-belt assisted load carriage required less rectus abdominis activity compared to using shoulder-borne only backpacks; however, external oblique was not influenced by backpack condition. Our results revealed different responses between iliocostalis and longissimus, and between rectus abdominis and external obliques, suggesting different motor control strategies between anatomical planes.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9624329","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

Supervised exercise with or without laser-guided feedback for people with non-specific chronic low back pain. A randomized controlled clinical trial 针对非特异性慢性腰痛患者进行有或无激光引导反馈的监督性运动。一项随机对照临床试验

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102776

A. Caña-Pino , M.D. Apolo-Arenas , D. Falla , E. Lluch-Girbés , L. Espejo-Antúnez

{"title":"Supervised exercise with or without laser-guided feedback for people with non-specific chronic low back pain. A randomized controlled clinical trial","authors":"A. Caña-Pino , M.D. Apolo-Arenas , D. Falla , E. Lluch-Girbés , L. Espejo-Antúnez","doi":"10.1016/j.jelekin.2023.102776","DOIUrl":"10.1016/j.jelekin.2023.102776","url":null,"abstract":"<div><h3>Background</h3><p>Among the most effective therapeutic interventions in non-specific chronic low back pain (NSCLBP), clinical practice guidelines highlight exercise therapy and patient education; However, regarding the combined intervention of exercise and Pain Neuroscience Education (PNE), there is no consensus on the most effective form of exercise.</p></div><div><h3>Objetive</h3><p>To find out what changes occurred after the application of two exercise modalities [Supervised Exercise (SE) and Laser-Guided Exercise (LGE)] and PNE on pain, pain pressure thresholds, disability, catastrophizing, kinesiophobia and lumbar proprioception in subjects with NSCLBP.</p></div><div><h3>Methods</h3><p>Single-blind randomized clinical controlled trial. 60 subjects with NSCLBP. Both groups performed a a total of 16 therapeutic exercise sessions and 8 Pain Neuroscience Education sessions. With the Laser-Guided Exercise Therapy group performing laser-guided exercises.</p></div><div><h3>Results</h3><p>A significant decrease was observed for pain intensity for both groups between baseline and post-intervention and the 3 month follow-up (p < 0.001). There was a significant between-group difference between baseline and post-intervention scores in terms of pain intensity and kinesiophobia in favour of the LGE group.</p></div><div><h3>Conclusion</h3><p>Supervised exercise with or without laser feedback, when combined with PNE, reduces pain intensity, disability, pain catastrophizing, kinesiophobia and improves proprioception and PPTs in patients with NSCLBP. At a 3-month follow-up, the combination of LGE plus PNE is most effective for reducing pain intensity.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9570319","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: 1

Effects of gender and fatigue on strength and activity of gluteus medius muscle during a controlled cutting maneuver in preadolescent athletes 性别和疲劳对青春期前运动员控制切割动作中臀中肌力量和活动的影响

IF 2.5 4区医学

Journal of Electromyography and Kinesiology Pub Date : 2023-06-01 DOI: 10.1016/j.jelekin.2023.102779

G. Jonasson , M.H. Ghasemi , U.S. Jonsdottir , K. Briem , P. Sveinsson

{"title":"Effects of gender and fatigue on strength and activity of gluteus medius muscle during a controlled cutting maneuver in preadolescent athletes","authors":"G. Jonasson , M.H. Ghasemi , U.S. Jonsdottir , K. Briem , P. Sveinsson","doi":"10.1016/j.jelekin.2023.102779","DOIUrl":"10.1016/j.jelekin.2023.102779","url":null,"abstract":"<div><p>The present study aimed to investigate the effects of gender on hip muscle strength and activity during a controlled cutting maneuver in preadolescent athletes. Fifty-six football and handball preadolescent players participated (35 females and 21 males). Normalized mean activity of the gluteus medius (GM) muscle was measured using surface electromyography during cutting maneuvers in pre-activation and eccentric phases. The stance duration and the strength of hip abductors and external rotators were recorded with a force plate and a handheld dynamometer, respectively. Descriptive statistics and mixed model analysis were used to assess statistical difference (α = 0.05). The results showed that boys activate the GM muscle significantly more than girls during the pre-activation phase (P = 0.022). Boys also demonstrated greater normalized strength of hip external rotation than girls (P = 0.038), but not for hip abduction or duration of stance (P > 0.05). When adjusted for abduction strength, however, boys had significantly shorter stance duration than girls (P = 0.006). It seems that sex-dependent differences are present in preadolescent athletes as observed in the strength of hip external rotator muscles and neuromuscular activity of the GM muscle during a cutting maneuver. Future studies are needed to investigate whether these changes influence risk of lower limb/ACL injury during sport activities.</p></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9563281","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