新规则视角下男子跆拳道技战术发展趋势——以世界冠军李大勋为例     

何芸  庞俊鹏 《武汉体育学院学报》2019,53(12):82-87

文章采用文献资料法、专家访谈法、视频分析法和数理统计法，对李大勋在重大国际赛事中的交手回合、基本技术、组合技术的应用频数以及成功率等指标进行统计分析。根据2018-2019年度世界跆拳道联盟公布的最新奥运积分显示，李大勋拥有605.94个奥运积分且高于第二名将近300余分，目前世界排名第一，其技战术风格具有一定的代表性。结果显示：李大勋在比赛中习惯采用前腿侧踢与前腿横踢技术进行主动进攻、控制距离、防守破坏、封堵迎击；利用后腿横踢技术进行补充击打；灵活使用中变中、中变高等变线技术突破对手；新规则后近身贴靠时攻防转换技战术变化多样，"推+踢"技术运用巧妙，增加了其得分手段。分析认为，在实施新规则的比赛中李大勋结合判罚尺度与分值的变化，优化了进攻方式，增加了得分手段，提高了时局节奏，同时反映出现阶段跆拳道项目技战术发展趋势。  相似文献   

Effect of different loading conditions on running mechanics at different velocities     

Germán Carretero-Navarro  Doménico Cherubini  Wolfgang Taube 《European Journal of Sport Science》2019,19(5):595-602

Weighted vests are widely used to improve running economy and performance. However, it is not well-studied how running mechanics are adapted to counteract the higher peak vertical ground reaction forces (Fpeak) while running with such a device. Therefore, the present study aimed to investigate the effects of different loading conditions on running mechanics at different velocities. Thirteen subjects participated in two separate sessions one week apart. In the first session, maximal aerobic speed (MAS) was determined through a maximal incremental running test while in the second session, they were instructed to run during one minute under different loading (0%, +10% and +20% of body mass [BM]) and velocity (60%, 80% and 100% of MAS) conditions in a random order. Spatiotemporal data were recorded and then running mechanics modelled using the spring-mass model. The main results indicated that vertical and leg stiffness (Kvert and Kleg, respectively) were increased (P?P?>?.05) when load was changed. At the same time, alterations of the running kinematics were observed such as longer contact times, reduced flight times, stride frequencies and step lengths, as well as an increase of the centre of mass dynamics. Based on these results it is assumed that runners maintain a certain stiffness level for each velocity despite different loading conditions. As a consequence, Fpeak increases and this probably causes spatiotemporal adjustments in the movement kinematics.  相似文献   

Sex differences in elbow and wrist joint loading during the cartwheel and round off with different hand positions performed by young gymnasts     

Roman Farana  Gerda Strutzenberger  Timothy Exell  Jiri Skypala  Huw Wiltshire  Gareth Irwin 《Journal of sports sciences》2019,37(13):1449-1456

The aim of the study was to determine if sex differences exist in the key elbow and wrist joint injury risk factors during different cartwheel (CW) and round-off (RO) techniques performed by young male and female artistic gymnasts. Sixteen active young gymnasts (8 males and 8 females) performed 30 successful trials of CW and RO with three different hand positions (parallel (10), T-shape (10) and reverse (10)). Synchronised kinematic and kinetic data were collected for each trial. Two-way repeated measures ANOVA (3 × 2, technique × sex) and effect-sizes (ES) were used for statistical analysis. In conclusion, female gymnasts exhibited greater normalised peak vertical ground reaction forces (VGRF), elbow and wrist compression forces and elbow internal adduction moments during CW and RO skills compared with male gymnasts. In both sexes, the parallel and reverse techniques increased peak VGRF, elbow and wrist compression forces and the elbow internal adduction moment. Increased elbow flexion resulted in decreased peak VGRF, elbow compression forces and elbow internal adduction moment. Injury risk factors including elbow extension and internal adduction moment with axial compression force suggest that a CW and RO in reverse and parallel techniques can be hazardous especially for young female gymnasts.  相似文献   

赛艇技术诊断人机智能决策支持系统的研制与开发   总被引：2，自引：0，他引：2  

胡一平  孙传宁 《山东体育科技》2003,25(2):20-22

针对目前赛艇技术诊断专家系统(RTDS)中存在的过分强调计算机的智能和人机功能的不协调问题，指出专家的一部分智能(指与专家经验有关的能力)与认识主体是不可分的，计算机是不能够代替专家的。认为只有人机合理分工，相互协调，才能从根本上提高决策支持系统的智能。研制人机智能决策支持系统的目的，就是为我国赛艇项目的技术训练提供一种切实可行的诊断方法。  相似文献   

中长跑项目多课次训练模式   总被引：4，自引：0，他引：4  

毕红星 《山东体育科技》2003,25(4):3-4,9

对中长跑“多课次”训练的概念、必要性、生理学基础等进行较为详细的论述，并对“多课次”训练计划的安排及应注意的问题作了说明，旨在丰富中长跑训练的方法手段，保证训练的质量，尽快提高成绩。研究认为。中长跑采用“多课次”训练是可行的。也是必要的，是科学化运动训练的一大体现。建议：“多课次”训练时间的安排，应突破传统的条条框框。在全天24小时内合理安排。实践中逐步摸索出适合每位运动员最为科学的训练课次及运动负荷量。  相似文献   

孔令辉正手近台反冲前冲弧圈球技术的运动学分析     

柳天杨  王新  王家正 《体育学刊》2003,10(2):106-108

运用三维摄影与影片解析技术，对孔令辉正手近台反冲前冲弧圈球技术进行了定量分析与研究，第一次较完整地阐述了横拍反胶快攻结合弧圈选手正手近台反冲前冲弧圈球技术的特点与规律，结果显示，该项技术具有动作幅度较小，瞬间发力集中，回球速度快等特点。  相似文献   

对我国掷标枪后备人才最后用力投掷技术的探讨   总被引：2，自引：0，他引：2  

曲淑华  马树芝  曲言明 《北京体育大学学报》2003,26(5):692-693,696

对中国优秀青少年标枪运动员的技术进行分析,分析我国的青少年标枪运动员的掷标枪技术不十分理想。主要表现在:最后用力时的右脚着地发力不积极;左膝关节弯曲过大,并在出手时没有充分伸展;投掷手臂没有明显的延迟动作。  相似文献   

双杠支撑摆动“钟摆式”保护方法探讨     

陆跃琴  林小美  范启龙 《浙江体育科学》2003,25(4):58-59,64

运用常规保护法与“钟摆式”保护法等两种不同的方法，对双杠支撑摆动技术进行了研究和实践探索。实践表明：双杠支撑摆动的教学，教练员运用双手同时扶持运动员的躯干定点部位进行保护的方法(“钟摆式”保护法)，有助于运动员在短时间内掌握并提高双杠支撑摆动的技术。  相似文献   

我国优秀蹦床运动员网上非技术性位移的初步研究   总被引：4，自引：1，他引：3  

牛雪松  刘兴 《沈阳体育学院学报》2003,(3):89-91

采用文献资料、现场观察、专家访谈、数理统计等研究方法 ,对我国高水平蹦床运动员网上水平位移现象进行初步研究。认为位移过大是影响成套动作稳定性及动作质量的重要因素之一 ;位移过大与起跳技术和连接技术不合理有关 ,也与运动员原有项目技能的负迁移影响有关 ;网上位移表现为一定的方向性 ,向前空翻类动作的水平位移略小于向后空翻类动作的位移。  相似文献   

对我国部分优秀女排队员跑步移动拦网技术的运动学分析     

程全德 《吉林体育学院学报》2006,22(4):41-43

拦网是排球运动技、战术的重要组成部分。目前，在拦网技术中以双人拦网最为常见，尤其是在对方4号位的扣强攻球（即一般强攻扣球）时。其中3号位队员向2号位移动拦网是组成双人拦网的关键。应用DLT法，通过对辽宁与天津队的副攻队员在3号位向2号位移动拦网的整个动作进行分析，揭示移动拦网技术的运动学特征。探讨影响动作效果的有关运动学因素，为今后的教学和训练提供参考。  相似文献