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31.
肌电与足底压力同步测量在对我国优秀速滑运动员
蹬冰单步周期研究中的应用 总被引：14，自引：4，他引：10
目的:旨在建立肌电与足底压力同步模型,从身体内部工作状态的角度探讨速度滑冰的一般规律。方法:同步测量速滑运动肌电与足底压力以及视频信号,建立速度滑冰直道蹬冰单周期模型,揭示运动员身体内、外参数的变化规律。结果:建立了速滑蹬冰单周期模型,提出膝角120°位置处的爆发力为速滑的主要用力特征,将速滑蹬冰单周期细分为6个阶段。结论:肌电与足底压力同步测量、同步肌电分析方法的结合能有效地获取速滑运动身体信息和揭示运动规律,是一种有力的体育科学研究方法。 相似文献
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运用iEMG评价举重运动员力量素质的研究 总被引：1，自引：0，他引：1
通过采集湖南省举重队8名运动员在等动练习时的表面肌电信号和对实验的观察，研究应用积分肌电评价运动员力量素质的可行性。结果发现：平均积分肌电与平均峰值力矩和平均做功之间存在明显的相关关系。这提示应用积分肌电技术来评价力量素质并监控力量由训练大有可为。 相似文献
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极限负荷斜蹲过程中股外肌肌电信号变化及针刺和静力牵张对其恢复过程的影响 总被引：2，自引：0，他引：2
对极限负荷斜蹲过程中,股外肌肌电信号特征的变化及针刺和静力牵张对其恢复过程的影响进行了研究.结果表明,在一组斜蹲至力竭过程中,IEMG(积分肌电)随起蹲次数的增加面增加,MPF(平均功率频率)则没有明显的变化;在多组斜蹲至力竭过程中,等长段、克制段的MPF与工作能力达到70%～50%最大工作能力时,形成峰值,退让段则没有此变化;斜蹲时,股外肌IEMG在等长段最大,克制段次之,退让段最低;针刺和静力牵张腿在24及48h后的肌电各指标,同运动结束时相比显著降低,对照腿则不显著. 相似文献
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文章通过肌电测试优秀太极拳运动员做搂膝拗步动作时,用意识引导动作和无意识做动作时下肢肌肉产生的肌电变化,从肌电、运动学方面进行比较与分析。研究结果表明：在两种状态下做动作,肌肉被激活的时间、持续的时间及肌电值等肌肉活动特征发生了不同的变化,说明在练习太极拳时,通过意识引导动作对人体肌肉运动产生良好的调节效果。 相似文献
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设计了人体下肢轻型便携式假肢的肌电信号采集装置,主要包括4个模块：放大、滤波、MD转换以及USB接口通信模块;基于Labview虚拟仪器技术实现了信号的采集、分析及处理,取得了良好的实验效果。实验表明该装置具有较好的应用前景。 相似文献
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《European Journal of Sport Science》2013,13(2):89-96
Abstract This study examined the influence of holding a bag with one hand on the center of foot pressure (COP) and the electromyographic responses in lower leg muscles. Thirteen healthy male adults participated in this study to keep an upright posture while holding a load with the dominant hand with four bag weight conditions (0%, 15%, 30%, and 45% of maximal voluntary contraction (MVC) of the jerk strength). Integrated Electromyography (iEMG) and mean power frequency (MPF) of EMG were calculated to estimate the degree of muscle activity and fatigue in the tibialis anterior and soleus that are involved in ankle joint control. Body sway was evaluated by the mean position of left-right (X) and front-back (Y) axis sway and the following 4 body sway factors; unit time sway factor (F1), front-back sway factor (F2), left-right sway factor (F3), high frequency band power spectrum factor (F4). When holding a bag at 45% MVC or more of the jerk strength with a single hand for one minute, muscle activity in the lower leg on the side of the bag increased markedly, and muscle fatigue was induced in the antigravity muscles of both legs. As a result, anteroposterior sway increased to a short, quick sway. 相似文献
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Emiliano Cè Eloisa Limonta Martina A. Maggioni Susanna Rampichini Arsenio Veicsteinas 《Journal of sports sciences》2013,31(8):856-866
Abstract The study aimed to assess the role of deep and superficial massage and passive stretching recovery on blood lactate concentration ([La?]) kinetics after a fatiguing exercise compared to active and passive recovery. Nine participants (age 23 ± 1 years; stature 1.76 ± 0.02 m; body mass 74 ± 4 kg) performed on five occasions an 8-min fatiguing exercise at 90% of maximum oxygen uptake, followed by five different 10-min interventions in random order: passive and active recovery, deep and superficial massage and stretching. Interventions were followed by 1 hour of recovery. Throughout each session, maximum voluntary contraction (MVC) of the knee extensor muscles, [La?], cardiorespiratory and metabolic variables were determined. Electromyographic signal (EMG) from the quadriceps muscles was also recorded. At the end of the fatiguing exercise, [La?], MVC, EMG amplitude, and metabolic and cardiorespiratory parameters were similar among conditions. During intervention administration, [La?] was lower and metabolic and cardiorespiratory parameters were higher in active recovery compared to the other modalities (P < 0.05). Stretching and deep and superficial massage did not alter [La?] kinetics compared to passive recovery. These findings indicate that the pressure exerted during massage administration and stretching manoeuvres did not play a significant role on post-exercise blood La? levels. 相似文献
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Jeffrey C. Ives Lawrence Abraham Walter Kroll 《Research quarterly for exercise and sport》2013,84(4):335-348
Abstract Rapid, goal-directed elbow flexion movements were examined under interacting conditions of inertial loading and resistance to movement initiation. The resistance ceased when movement began, resulting in quick release movements. Inertial load slowed the movement and lengthened the agonist and antagonist electromyographic (EMG) burst durations. The quick release resulted in larger accelerations but only minimal changes in peak velocity. Most aspects of the triphasic EMG pattern were little affected by the quick release, but the build up of agonist EMG and the corresponding rate of static force development differed markedly between load and quick release conditions. These and other data suggest that the specific pattern of agonist muscle activation is set according to neuromuscular constraints of the antagonist muscle and the expectation of movement dynamics. 相似文献
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Charles S. Layne Ph.D. candidate Lawrence D. Abraham 《Research quarterly for exercise and sport》2013,84(1):36-40
Abstract Activity patterns of four major muscles were studied in the support leg during a standard one foot balance test. Electromyographic (EMG) activity of the tibialis anterior (TA), peroneus longus (PL), gluteus medius (GM), and adductor magnus (AM) was recorded from 10 boys (aged 7-9 yr) during 30 s balance trials. Rectified, low-pass filtered EMG data, converted to percentages of maximum contractions, were used to establish muscle activation patterns. The results showed that lateral shifts in balance were primarily mediated by the ankle musculature, while the hip muscles appeared to stabilize the pelvis. Immediately prior to lateral shifts of the center of pressure (COP), the activity of each ankle muscle was similar to the activity of the following pose. The hip muscles, however, were not consistently linked to ankle activity. Thus, the control of one-legged lateral balance does not rely on fixed hip-ankle synergies. 相似文献