共查询到20条相似文献，搜索用时 484 毫秒
1.
2.
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
3.
目的：分析正脚背踢球动作中下肢和腘绳肌生物力学特征参数,探讨踢球动作腘绳肌拉伤危险时相,同时探究腘绳肌和股四头肌力量素质与踢球动作下肢和腘绳肌生物力学特征的关系,进一步明确踢球动作中腘绳肌拉伤机制。方法：以15名足球专项国家一级运动员为受试者,采集180(°)/s动作角速度下的等速腘绳肌向心(Hcon)、腘绳肌离心(Hecc)、股四头肌向心峰值力矩(Qcon);采集受试者最大力正脚背踢球动作运动学和肌电数据,根据腘绳肌肌肉起止点和髋、膝关节中心的相对位置获得肌肉起止点坐标,从而获得腘绳肌3块双关节肌肌肉-肌腱复合体(muscle-tendon unit,MTU)长度,以MTU拉伸速度和标准化MTU长度为分析指标。采用样条插值法对各指标按踢球动作周期阶段进行3次归一化处理。结果：腘绳肌3块双关节肌在正脚背踢球动作小腿前摆阶段和触球随摆阶段处于激活状态并被拉长,进行离心收缩;触球随摆阶段3块双关节MTU拉伸速度、肌标准化MTU长度、肌肉激活程度均显著大于小腿前摆阶段(P<0.05),标准化MTU长度在触球随摆阶段中期达... 相似文献
4.
张家正 《天津体育学院学报》1986,(1)
一、前言对人体运动规律的探讨常需要对人体运动过程中的肌肉活动、力的作用和动作规律进行对应分析。为此很多生物力学学者,从不同方面探讨了上述参数的同步测定方法,并取得不少研究成果。但从目前已出现的同步测定方法看,大部分仍属于在一个信号下同时启动摄影机、肌电图机、测力系统的方法,如美国加州大学用在同一电信号开始记录肌肉收缩中肌电与力的瞬时对应关系;我国王云德用在同一信号下启动摄影机、测力系统记录举重运动过程 相似文献
5.
运用两台日本松下MD-9000数码摄像机对6名优秀散打运动员鞭腿动作进行同步拍摄,采用美国ARIEL系统进行三维图像解析,从运动学的角度揭示我国优秀男子散打运动员鞭腿动作支撑腿和进攻腿髋、膝关节速度和角度变化特征,以期为鞭腿技术动作的教学、训练提供科学依据. 相似文献
6.
设置靶模具和信号灯，运用两台CASIO-EXFH25摄像机对两名国际级散打和泰拳选手后横踢动作进行同步拍摄，采用APAS系统（美国）进行三维视频图像解析，用Megwin Me6000表面肌电同步肌肉活动信号，对中泰横踢技术各运动环节支撑腿和进攻腿髋、膝、踝关节速度和角度变化特征，肌肉动员顺序、肌电特征进行对比分析，寻找差距，揭示技术动作内在规律，以期为鞭腿技术动作的教学、训练提供科学依据。 相似文献
7.
通过对眭禄和张业琳子团身前空翻转体180度动作进行运动学分析,得到相关运动学数据。以研究平衡木团身前空翻转体180度动作的运动学特征,为平衡木运动员练习团身前空翻转体180度动作提供技术参考。结果显示:在腾空阶段,眭禄的转体速度稍慢;眭禄落木缓冲技术更好,但稳定性需进一步提高。结论:在腾空阶段,眭禄应加快转体速度;在落木阶段,眭禄应提高落木的稳定性。 相似文献
8.
运用三维运动学的研究方法,对参加2005年全国第十届体育运动会举重比赛的运动员石智勇的抓举技术进行运动学分析。结果表明,提铃过程中人杠重心间距控制合理,杠铃平均加速度超过2 m/s2,体现了优异的爆发力和出色的提铃技术;引膝阶段的技术与常规引膝技术已有了很大的改变,该阶段用时很短,膝关节角度也几乎没产生变化,通过对膝关节的制动充分发挥了腰背部肌肉力量,使抓举时杠铃最高加速度的值出现在引膝阶段而非发力阶段,这是最体现石智勇抓举技术特点的地方;抓举发力阶段,身体用力协调,各关节角度的把握也恰到好处;抓举下蹲支撑阶段技术动作堪称完美,人杠重心间距控制合理,杠铃回落距离仅为13.6 cm,人体重心向下的平均加速度为11.2 m/s2,两项均属于世界顶级选手的技术指标;在起立阶很好地利用了杠铃的弹性势能,与杠铃同步起立,同时人杠重心间距仅为0.002 m,确保了起立的稳定性。 相似文献
9.
国内、外优秀女子铁饼运动员掷铁饼技术的比较研究 总被引：1，自引：0，他引：1
对国内、外优秀女子铁饼运动员掷铁饼动作的运动学参数进行测量、比较与分析。结果显示:1)我国2名优秀女子运动员在出手速度上不存在劣势,然而,在出手速度、出手角度与出手高度三者组合的优化程度上不如国外优秀运动员;2)李艳凤在第1单支撑和第2单支撑阶段时间较短,谭建在第2双支撑阶段的时间较短;3)我国2名运动员在第2单支撑阶段铁饼增速较多,在第2双支撑阶段铁饼增速较少,这对出手速度有一定程度的影响;4)我国2名运动员在第2双支撑阶段人体重心速度下降较少,在一定程度上反映了"人-饼"系统内能量传递效率较低,这与第1双支撑阶段人体重心速度增量较少有一定关系;5)我国2名运动员在第1双支撑与腾空阶段中,铁饼移动距离较长,体现了大幅度摆饼的特点;6)国外优秀运动员在掷铁饼动作中,人体的平动范围较大,特别是在两个双支撑阶段,这有利于提高第1单支撑阶段的人体重心速度的增加,也有利于在第2双支撑阶段为最后用力动作做好充分的准备。 相似文献
10.
11.
12.
13.
14.
运用三维图像解析系统,采用三维摄像、三维测力台和表面肌电仪对两组不同级别男子武术套路运动员的仰身平衡和燕式平衡动作进行运动学、动力学和肌电学方面的研究,从生理学和运动生物力学角度分析仰身平衡和燕式平衡的技术特征和力学原理。 相似文献
15.
This study applied a vision-based tracking approach to the analysis of articulated, three-dimensional (3D) whole-body human
movements. A 3D computer graphics model of the human body was constructed from ellipsoid solids and customized to two gymnasts
for size and colour. The model was used in the generation of model images from multiple camera views with simulated environments
based on measurements taken on each of three synchronized video cameras and the lighting sources present in the original recording
environment. A hierarchical procedure was used whereby the torso was tracked initially to establish whole-body position and
orientation and subsequently body segments were added successively to the model to establish body configuration. An iterative
procedure was used at each stage to optimize each new set of variables using a score based on the RGB colour difference between
the model images and video images at each stage. Tracking experiments were carried out on movement sequences using both synthetic
and video image data. Promising qualitative results were obtained with consistent model matching in all sequences, including
sequences involving whole-body rotational movements. Accurate tracking results were obtained for the synthetic image sequences.
Automatic tracking results for the video images were also compared with kinematic estimates obtained via manual digitization
and favourable comparisons were obtained. It is concluded that with further development this model-based approach using colour
matching should provide the basis of a robust and accurate tracking system applicable to data collection for biomechanics
studies. 相似文献
16.
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
17.
三维摄像方法在排球技术研究中的应用 总被引：8，自引：2，他引：6
论述了三维高速摄像方法在排球技术研究中由现场拍摄技术动作、录像解析直至动作分析的具体方法 ,阐述了排球技术分析的主要指标及步骤 ,对排球技术的科学研究有着重要意义。 相似文献
18.
Sérgio Marta Luís Silva João Rocha Vaz Maria António Castro Gustavo Reinaldo Pedro Pezarat-Correia 《Journal of sports sciences》2016,34(8):713-720
The aim of this study was to describe and compare the EMG patterns of select lower limb muscles throughout the golf swing, performed with three different clubs, in non-elite middle-aged players. Fourteen golfers performed eight swings each using, in random order, a pitching wedge, 7-iron and 4-iron. Surface electromyography (EMG) was recorded bilaterally from lower limb muscles: tibialis anterior, peroneus longus, gastrocnemius medialis, gastrocnemius lateralis, biceps femoris, semitendinosus, gluteus maximus, vastus medialis, rectus femoris and vastus lateralis. Three-dimensional high-speed video analysis was used to determine the golf swing phases. Results showed that, in average handicap golfers, the highest muscle activation levels occurred during the Forward Swing Phase, with the right semitendinosus and the right biceps femoris muscles producing the highest mean activation levels relative to maximal electromyography (70–76% and 68–73% EMGMAX, respectively). Significant differences between the pitching wedge and the 4-iron club were found in the activation level of the left semitendinosus, right tibialis anterior, right peroneus longus, right vastus medialis, right rectus femuris and right gastrocnemius muscles. The lower limb muscles showed, in most cases and phases, higher mean values of activation on electromyography when golfers performed shots with a 4-iron club. 相似文献
19.
多点摄像与解析方法在跳台滑雪技术分析中的应用 总被引：1，自引：1，他引：0
在运动影像解析技术领域里,为了准确地获取运动目标的三维空间坐标位置,一般使用定点、定焦摄像方式。对于大范围运动的动作解析,需要多台摄像机在多点位置进行定点、定焦动作捕捉。跳台滑雪运动是一个比较典型的、在较大范围内动作复杂的运动项目。对于优秀跳台滑雪运动员的三维动作解析问题是我国冰雪体育科研领域的前沿研究项目,其中如何捕捉和获取大范围运动信息是分析过程的关键环节之一。通过研究多点摄像解析方法在跳台滑雪运动中的应用,为处理大范围运动的动作捕捉与解析研究提供理论参考。 相似文献
20.
Graeme G. Sorbie Fergal M. Grace Yaodong Gu Julien S. Baker 《Journal of sports sciences》2018,36(7):717-723
The purpose of this study was to compare the electromyography (EMG) patterns of the thoracic and lumbar regions of the erector spinae (ES) muscle during the golf swing whilst using four different golf clubs. Fifteen right-handed male golfers performed a total of twenty swings in random order using the driver, 4-iron, 7-iron and pitching-wedge. Surface EMG was recorded from the lead and trail sides of the thoracic and lumbar regions of the ES muscle (T8, L1 and L5 lateral to the spinous-process). Three-dimensional high-speed video analysis was used to identify the backswing, forward swing, acceleration, early and late follow-through phases of the golf swing. No significant differences in muscle-activation levels from the lead and trail sides of the thoracic and lumbar regions of the ES muscle were displayed between the driver, 4-iron, 7-iron and pitching-wedge (P > 0.05). The highest mean thoracic and lumbar ES muscle-activation levels were displayed in the forward swing (67–99% MVC) and acceleration (83–106% MVC) phases of the swing for all clubs tested. The findings from this study show that there were no significant statistical differences between the driver, 4-iron, 7-iron and pitching-wedge when examining muscle activity from the thoracic and lumbar regions of the ES muscle. 相似文献