共查询到19条相似文献，搜索用时 468 毫秒
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表面肌电图是从肌肉表面通过电极引导,记录下来的神经肌肉系统活动的一维时间序列信号。肌肉运动时会有很小的生物电变化,表面肌电图的振幅、频谱指标均会发生相应变化。但是表面肌电图变化情况与测试方法的选择和运动方式密切相关。表面肌电图作为一种无创伤检测方法,在运动性肌肉疲劳研究中将发挥重要作用。 相似文献
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自行车运动时股四头肌肌电图指标与功率输出的比较研究 总被引：2，自引：0，他引：2
为了揭示运动训练对股四头肌sEMG指标与输出功率的影响,对52人次健康受试者测试30 s全力蹬踏自行车过程中的功率输出和MegaWin记录运动过程中的肌电变化。结果提示前5 s的单谱肌电图指标和后5 s单谱和平均谱与相对最大功率相关程度可反映训练水平,后5 s的单谱肌电图指标反映疲劳程度。 相似文献
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张佑磊 《体育科技文献通报》2011,19(12):145-147
表面肌电图也称动态肌电图和运动肌电图,是用表面电极采集肌肉活动产生的电活动的图形。目前,表面肌电图应用已经深入临床康复、运动医学、生物工程和体育等诸多领域。在运动生物力学研究中,表面肌电图主要用于肌肉力量评定、肌肉疲劳的诊断和神经肌肉功能的评价上,用于运动技术服务,指导运动训练,防止运动损伤。本文对表面肌电图在运动生物力学研究中的应用做一综述。 相似文献
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肌肉疲劳通常是指肌肉运动系统最大作功能力或者最大收缩能力的暂时下降,表面肌电图信号可以在一定程度上反映肌肉收缩功能的变化,其检测具有非损伤性、实际性、多靶点测量等优点.通过文献综述法简要总结了运动导致肌肉疲劳的表面肌电图特征,介绍了表面肌电图主要测量指标及其影响因素. 相似文献
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篮球运动员疲劳时肌电图特征分析 总被引：1，自引：0，他引：1
对篮球运动员机能的定量评定在实施技术训练计划中非常重要。肌电图在篮球领域的应用还比较少．运用肌电图对运动员肌肉状态指标的评定可以对运动训练有指导作用。 相似文献
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罗亮 《武汉体育学院学报》2011,45(1):55-59
研究优秀武术运动员无氧运动强度时肌电信号特征及其与血乳酸指标之间的相关性。研究对象为12名一级武术运动员和12名二级武术运动员。研究方法:肌电指标测试:两组受试对象负重体重的7.5%,在功率自行车上持续运动60s后记录运动中和运动后30s内肌电指标MPF、MF和IEMG;血乳酸测试:采集运动中(20s一次)和运动后3min内的血乳酸浓度。结论:两组受试对象的MPF和MF均呈线性下降,但是对照组下降的斜率始终大于试验组,表明对照组比试验组更容易疲劳;IEMG呈线性上升,随着时间的延长,斜率加大,并且试验组斜率始终大于对照组,表明实验组肌纤维的募集能力要强于对照组;各肌电图指标与血乳酸之间存在着高度的负相关,但是血乳酸的积累并不是引起肌电图指标变化的直接原因。 相似文献
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肌电与肌力的相互关系 总被引：1，自引：0，他引：1
肌肉收缩与肌肉的动作电位有十分密切的偶联关系,记录肌收缩时相应的动作电位变化就是肌电图;就目前的研究水平和应用程度而言,肌电图在体育运动中应用比较广泛,用肌电图研究肌肉活动的不同状态、肌 相似文献
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搞清楚速滑滑行时肌肉的活动形式,对于提高滑行技术是很重要的。关于运动时肌肉的活动形式已进行过的研究有:丰田等关于击剑击中标的时肌肉变化的研究,白井用肌电图分析自行车骑行动作的研究,小野等有关举重训练法的研究,猪饲等关于游泳中肌电图的研究;卡尔索关于打高尔夫球的研究,卡蒙关于鞍马肌电图学的研究等。这些研究搞清了运动和肌肉的活动形式之间的关系。关于滑冰滑行技术的研究虽然有报导,但是肌电图学的分析还没有。因此,本实验描记了滑行时腿肌的肌电图,试以阐明滑行时肌肉的活动形式。实验方法 相似文献
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李树屏 《天津体育学院学报》1986,(4)
肌电图生物反馈(EMG biofeedback),是利用肌电图仪记录并显示人体肌肉活动的信息,使受试者可有意识地控制某些肌肉的生理活动过程,从而达到训练肌肉、提高身体协调能力和控制能力、治疗疾病、促进机能恢复的目的。本文从肌电图生物反馈法的基本理论和方法入手,结合体育界的实际,探讨肌电图生物反馈在体育运动中应用的前景,提出了几类可用于运动训练的肌电图生物反馈研究方案,并进一步分析了肌电图生物反馈的方法学意义。 相似文献
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几种心理训练方法的应用效果及其综合评价手段的研究 总被引：19，自引：2，他引：17
采用Procomp生物反馈计算机分析处理系统对受试运动员进行肌电、皮电、皮温、心率等6项生理指标的测试,并结合动党误差、运动表象清晰度和焦虑状态问卷等,互理指标的测量分析。研究结果表明,上述几项指标能够较客观地评价运动员的心理状态和验证心理训练的效果 相似文献
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The control of human limb movement has been the focus of research for more than a century. A major issue to emerge from this work is the manner in which the central nervous system regulates electromyographic (EMG) activity to produce movements that differ in distance, velocity, and movement time. However the different methods of analysis often used to analyze EMG data could result in different kinematic-EMG relationships. In this study, participants performed an elbow flexion task to one of five distance goals (between 5 degrees and 50 degrees) using three movement speeds. EMG data from the right elbow flexors were compared using a trial-by-trial analysis and one based on averaged data. Averaging across trials underestimated biceps EMG amplitude at all movement distances and speeds compared to a trial-by-trial analysis. Averaging overestimated EMG burst duration compared to the trial-by-trial analysis. Peak agonist EMG amplitude was positively related to distance and inversely related to movement time. Agonist EMG duration was constant for movement distances less than 30 degrees but increased in the 50 degrees condition. The results support the view that peak EMG amplitude and duration can be controlled independently, but EMG duration changes only for longer distance movements when additional force is required. 相似文献
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João R. Vaz Bjørn Harald Olstad Jan Cabri Per-Ludvik Kjendlie Pedro Pezarat-Correia François Hug 《Journal of sports sciences》2016,34(20):1941-1948
The present study aimed to compare muscle coordination strategies of the upper and lower limb muscles between beginners and elite breaststroke swimmers. Surface electromyography (EMG) of eight muscles was recorded in 16 swimmers (8 elite, 8 beginners) during a 25 m swimming breaststroke at 100% of maximal effort. A decomposition algorithm was used to identify the muscle synergies that represent the temporal and spatial organisation of muscle coordination. Between-groups indices of similarity and lag times were calculated. Individual muscle patterns were moderately to highly similar between groups (between-group indices range: 0.61 to 0.84). Significant differences were found in terms of lag time for pectoralis major (P < 0.05), biceps brachii, rectus femoris and tibialis anterior (P < 0.01), indicating an earlier activation for these muscles in beginners compared to elites (range: ?13.2 to ?3.8% of the swimming cycle). Three muscle synergies were identified for both beginners and elites. Although their composition was similar between populations, the third synergy exhibited a high within-group variability. Moderate to high indices of similarity were found for the shape of synergy activation coefficients (range: 0.63 to 0.88) but there was a significant backward shift (?8.4% of the swimming cycle) in synergy #2 for beginners compared to elites. This time shift suggested differences in the global arm-to-leg coordination. These results indicate that the synergistic organisation of muscle coordination during breaststroke swimming is not profoundly affected by expertise. However, specific timing adjustments were observed between lower and upper limbs. 相似文献
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利用表面肌电图仪,对虹口剑校3名优秀女子花剑运动员进行肌电测试,分析这3名运动员在完成刺剑技术动作时的肌电信号变化,探讨女子花剑运动员训练肌肉的肌电活动特点。通过肌电活动及肌肉用力状态,对花剑刺剑技术进行研究,为选择针对性更强的专项训练方法、手段提供建议和参考。 相似文献
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AbstractThe study investigated different electromyographic (EMG) normalisation methods for upper-limb muscles. This assessment aimed at comparing the EMG amplitude and the reliability of EMG values obtained with each method. Eighteen male tennis players completed isometric maximal voluntary contractions and dynamic strength exercises (push-ups and chin-ups) on three separate test sessions over at least 7 days. Surface EMG activity of nine upper body muscles was recorded. For each muscle, an analysis of variance for repeated measures was used to compare maximal EMG amplitudes between test conditions. The intra-class correlation coefficient, the coefficient of variation and the standard error of measurement were calculated to determine the EMG reliability of each condition. On the basis of a compromise between maximal EMG amplitude and high reliability, the chin-ups appeared to be the optimal normalisation method for M. latissimus dorsi, M. posterior deltoid, M. biceps brachii, M. flexor carpi radialis and M. extensor carpi radialis. The push-ups seemed relevant to normalise M. anterior deltoid and M. triceps brachii activity, while isometric maximal voluntary contraction remained the most appropriate method for M. pectoralis major and M. middle deltoid. Thus, original methods are proposed to normalise EMG signal of upper-limb muscles. 相似文献
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Timothy C. Mauntel Tyler R. Cram Barnett S. Frank Rebecca L. Begalle Marc F. Norcross J. Troy Blackburn 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(2):273-284
Lower extremity injuries have immediate and long-term consequences. Lower extremity movement assessments can assist with identifying individuals at greater injury risk and guide injury prevention interventions. Movement assessments identify similar movement characteristics and evidence suggests large magnitude kinematic relationships exist between movement patterns observed across assessments; however, the magnitude of the relationships for electromyographic (EMG) measures across movement assessments remains largely unknown. This study examined relationships between lower extremity kinematic and EMG measures during jump landings and single leg squats. Lower extremity three-dimensional kinematic and EMG data were sampled from healthy adults (males = 20, females = 20) during the movement assessments. Pearson correlations examined the relationships of the kinematic and EMG measures and paired samples t-tests compared mean kinematic and EMG measures between the assessments. Overall, significant moderate correlations were observed for lower extremity kinematic (ravg = 0.41, rrange = 0.10–0.61) and EMG (ravg = 0.47, rrange = 0.32–0.80) measures across assessments. Kinematic and EMG measures were greater during the jump landings. Jump landings and single leg squats place different demands on the body and necessitate different kinematic and EMG patterns, such that these measures are not highly correlated between assessments. Clinicians should, therefore, use multiple assessments to identify aberrant movement and neuromuscular control patterns so that comprehensive interventions can be implemented. 相似文献
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Jeffrey C. Ives Walter P. Kroll Linda L. Bultman 《Research quarterly for exercise and sport》2013,84(3):274-283
Abstract Maximally fast, self-terminated, elbow flexion movements were performed by 10 male and 10 female college-aged subjects to assess potential gender-related differences in kinematics and the triphasic electromyographic (EMG) pattern. The subjects were instructed to move their forearms as fast as possible through 90° of elbow flexion range of motion and stop as sharply as possible at the terminal point. An electromagnet, set to 0, 40, and 70% of each subject's maximal isometric torque, provided resistance to movement initiation and resulted in quick release movements. Surface EMG was collected from the biceps b. and triceps b. muscles. Results indicated that the males had faster movements and accelerations under all conditions. EMG records indicated that the males had faster rates of EMG rise, particularly in the triceps b., and more tightly coupled reciprocal activation. The quick release afforded faster accelerations for both groups, yet only the males moved faster throughout the full range of motion. Following the quick release, the males differed from the females by increasing the triceps b. EMG amplitude. Hence, the males were able to shorten movement time in quick release movements by increasing triceps b. activation and, thus, braking ability. These results suggest that the females were more neurally constrained than the males with respect to rapid EMG activation of the triceps b., resulting in limits in the braking process. 相似文献