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1.
张良 《天津体育学院学报》2009,24(3):265-268
采用文献资料法、三维录像解析法以及数理统计等研究方法,以2007年全国田径锦标赛女子铁饼前8名的投掷技术为研究对象,对我国优秀女子铁饼运动员在掷铁饼最后用力阶段身体重心的时间、空间以及速度节奏进行了定量分析.同时采用Person相关分析对我国优秀女子铁饼运动员最后用力阶段身体重心的时间、空间以及速度的变化与投掷成绩进行了检验,提出了我国优秀女子铁饼运动员最后用力阶段身体重心节奏变化的量化指标. 相似文献
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采用文献资料法、三维录像解析法以及数理统计法,以2007年全国田径锦标赛女子铁饼比赛前8名运动员的投掷技术为研究对象,对我国优秀女子铁饼运动员最后用力阶段肩、髋速度变化进行分析.结果表明:在最后用力的两个阶段,我国优秀女子铁饼运动员肩、髋速度变化差异较大,并且莱些环节速度变化与成绩之间存在显著相关关系. 相似文献
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我国女子铁饼运动员旋转阶段环节技术指标的三维运动学分析 总被引：2，自引：1，他引：1
运用三维摄像方法对我国8名优秀女子掷铁饼运动员（右手掷铁饼）的旋转技术进行研究,利用三维运动快速解析系统获取数据,经皮尔森相关分析获得旋转阶段各个环节与铁饼成绩相关密切的指标.通过分析得出：不同阶段对铁饼最后成绩的影响指标有所不同. 相似文献
4.
张良 《山东体育学院学报》2009,25(2)
采用三维录像解析、Person相关分析等方法,以2007年全国田径锦标赛女子铁饼比赛前8名运动员的投掷技术为研究对象,对女子铁饼运动员最后用力阶段速度变化与投掷成绩进行了相关性分析,结果显示:在最后用力的初始加速阶段以及最后用力的最后加速阶段存在着与投掷成绩密切相关的速度变化,并且,两个阶段某些环节速度变化的比值与投掷成绩也存在显著相关关系. 相似文献
5.
对我国优秀男子铁饼运动员投掷技术的运动学分析 总被引：17，自引：0，他引：17
通过对我国优秀男子铁饼运动员旋转掷铁饼技术的速度结构特征和动作结构特征的初步分析,发现我国男子铁饼运动员与国外优秀运动员的主要差距是双支撑起转阶段和旋转阶段铁饼的速度损失较大。腾空和过渡时间长、肩髋柔韧性差、最后用力时机晚等是影响我国运动员铁饼速度发挥的主要因素。 相似文献
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对我国优秀女子铁饼选手最后用力技术的运动学分析 总被引：10，自引：0，他引：10
掷铁饼技术的最后用力是整个技术过程的关键环节。采用高速同步摄影与影片三妥析的方法,对我国部分优秀女子铁饼选手的投掷技术进行测试,取得所需技术参数原始数据,运用解析的最后用力技术单腿支撑和双腿支撑阶段时间、人体与器械质心速度变化,以及器械质心高、低点出现时机等多种技术参数,揭示掷铁饼最后用力技术中人体－器械系统的运动学特征,并提出相关结论和建议,为教学、训练和科学提供定量化参考依据。 相似文献
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运用三维摄像方法对我国6名优秀男子铁饼运动员（右手掷铁饼）的旋转技术进行研究,利用三维运动快速解析系统获取数据,分析获得旋转阶段各个环节与铁饼成绩相关密切的指标。分析认为：不同阶段的肩髋俯视角度与重心的移动速度能影响到铁饼旋转技术完成过程中的节奏、时间分配和爆发性。 相似文献
9.
对我国优秀女子铁饼运动员肩、髋动作特征的研究 总被引：7，自引：1，他引：6
运用爱捷运动录像三维测量分析系统对我国优秀女子铁饼运动员的肩和髋的动作进行了三维运动学分析。结果表明 :左脚离地时的身体姿势对腾空、过渡阶段和最后用力阶段有着重要的影响 ;在最后用力阶段 ,拉引角数值的增量制约着铁饼运行的距离 ;我国运动员与世界优秀运动员的主要差距在过渡阶段。存在的问题 :运动员没能有效地做出右脚的转扣着地及着地后不停顿的旋转动作 ;左髋带动左大腿促使左脚尽快摆压动作过慢。 相似文献
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我国优秀女子铁饼运动员宋爱民投掷铁饼技术的三维运动学分析 总被引：2，自引：0，他引：2
宋爱民是我国优秀的女子铁饼运动员之一,她的技术风格代表了我国优秀的女子铁饼运动员的技术特征,发挥了我国优秀女子铁饼运动员身材灵巧的特点。运用三维摄像法对宋爱民的完整技术进行分析,得出相关数据,并与国外优秀运动员进行对比分析。研究结果表明:在右脚着地到左脚着地阶段,宋爱民的技术特点表现出非常快的特点,投掷臂在旋转过程中不太稳定,造成了一部分速度的损失。 相似文献
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本文采用三维录像解析法、Person相关分析等方法,以2007年全国田径锦标赛中孙太凤的5次有效投掷技术为研究对象,对孙太凤掷铁饼最后用力技术阶段的运动学参数与投掷成绩进行相关分析,结果显示：在左脚着地瞬间以及铁饼出手瞬间存在着与投掷成绩密切相关的运动学参数,同时,在最后用力的初始加速阶段、最后用力的最后加速阶段以及整个最后用力阶段也存在着与投掷成绩密切相关的运动学参数。 相似文献
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运用实验法、文献法、专家访谈法等对邢慧娜参加奥运会预选赛的现场技术资料,通过量化分析获得运动技术指标,结合运动训练实际,对邢慧娜1 500 m不同阶段的动作技术进行分析。结果表明:邢慧娜在加速度阶段表现出步长大、步频低的运动特点,着地腿"扒地"积极、着地角大、进入比赛状态慢的特点;途中跑阶段体现了"低抬摆快"技术特点;髋部轴心大肌肉群发力特点;冲刺阶段缓冲时间短,摆动腿送髋幅度大、"屈蹬"技术特点;全程表现出"步幅-速度型"技术特征。 相似文献
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主要通过数理统计法、录像分析法对2019年篮球世界杯中国男篮与前四强快攻防守效果进行比较分析。结论:1)中国队在快攻发动阶段的防守次数与防守率均显著高于前四强,但在防守成功率方面并无显著差异;2)中国队在快攻推进阶段的防守次数、防守成功次数方面显著低于前四强,在防守率、防守成功率方面非常显著地低于前四强;3)中国队在快攻结束阶段的防守率显著低于前四强,但防守成功率并无显著差异。建议:1)中国队需放弃快攻发动阶段效率不高的防守;2)中国队需提高快攻推进阶段的防守率、防守成功率;3)中国队需提高快攻结束阶段的防守率。 相似文献
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The aims of this study were to determine the influence of an 8-over spell on cricket fast bowling technique and performance (speed and accuracy), and to establish the relationship of selected physical capacities with technique and performance during an 8-over spell. Fourteen first-grade fast bowlers with a mean age of 23 years participated in the study. Physical capacities assessed were abdominal strength, trunk stability, selected girth and skinfold measures. During the delivery stride, bowlers were filmed from an overhead and lateral perspective (50 Hz) to obtain two-dimensional data for transverse plane shoulder alignment and sagittal plane knee joint angle respectively. Ball speed was measured by a radar gun and accuracy by the impact point of each delivery on a zoned scoring target at the batter's stumps. Shoulder counter-rotation did not change significantly between overs 2 and 8 for all bowlers, but was significantly related to a more front-on shoulder orientation at back foot impact. When the front-on fast bowlers (n = 5) were isolated for analysis, shoulder counter-rotation increased significantly between overs 2 and 8. Ball speed remained constant while accuracy showed some non-significant variation during the spell. Shoulder counter-rotation was significantly related to accuracy scores during the second half of the 8-over spell. Chest girth and composition and body composition were significantly related to ball release speed at various times during the spell. 相似文献
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Ferdinands R Marshall RN Kersting U 《Sports biomechanics / International Society of Biomechanics in Sports》2010,9(3):139-152
Kinematic studies have shown that fast bowlers have run-up velocities, based on centre of mass velocity calculations, which are comparable to elite javelin throwers. In this study, 34 fast bowlers (22.3 +/- 3.7 years) of premier grade level and above were tested using a three-dimensional (3-D) motion analysis system (240 Hz). Bowlers were divided into four speed groups: slow-medium, medium, medium-fast, and fast. The mean centre of mass velocity at back foot contact (run-up speed) was 5.3 +/- 0.6 m/s. Centre of mass velocity at back foot contact was significantly faster in the fastest two bowling groups compared to the slow-medium bowling group. In addition, stepwise multiple regression analysis showed that the centre of mass deceleration over the delivery stride phase was the strongest predictor of ball speed in the faster bowling groups. In conclusion, centre of mass kinematics are an important determinant of ball speed generation in fast bowlers. In particular, bowlers able to coordinate their bowling action with periods of centre of mass deceleration may be more likely to generate high ball speed. 相似文献
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Marc R. Portus Peter J. Sinclair Stephen T. Burke David J.A. Moore Patrick J. Farhart 《Journal of sports sciences》2013,31(12):999-1011
The aims of this study were to determine the influence of an 8-over spell on cricket fast bowling technique and performance (speed and accuracy), and to establish the relationship of selected physical capacities with technique and performance during an 8-over spell. Fourteen first-grade fast bowlers with a mean age of 23 years participated in the study. Physical capacities assessed were abdominal strength, trunk stability, selected girth and skinfold measures. During the delivery stride, bowlers were filmed from an overhead and lateral perspective (50 Hz) to obtain two-dimensional data for transverse plane shoulder alignment and sagittal plane knee joint angle respectively. Ball speed was measured by a radar gun and accuracy by the impact point of each delivery on a zoned scoring target at the batter's stumps. Shoulder counter-rotation did not change significantly between overs 2 and 8 for all bowlers, but was significantly related to a more front-on shoulder orientation at back foot impact. When the front-on fast bowlers ( n = 5) were isolated for analysis, shoulder counter-rotation increased significantly between overs 2 and 8. Ball speed remained constant while accuracy showed some non-significant variation during the spell. Shoulder counter-rotation was significantly related to accuracy scores during the second half of the 8-over spell. Chest girth and composition and body composition were significantly related to ball release speed at various times during the spell. 相似文献
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电子竞技运动作为新兴体育项目在我国发展势头强劲，但目前仍处于初级阶段，通过对其产业化现状研究和分析得出：电子竞技运动应该在管理、职业化等方面进行规范化管理；要加强宣传，提高赛事品牌；要遵照体育本体产业的发展规律、模式完成项目的产业化。 相似文献
19.
Rene Ferdinands Robert N. Marshall Uwe Kersting 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):139-152
Kinematic studies have shown that fast bowlers have run-up velocities, based on centre of mass velocity calculations, which are comparable to elite javelin throwers. In this study, 34 fast bowlers (22.3 ± 3.7 years) of premier grade level and above were tested using a three-dimensional (3-D) motion analysis system (240 Hz). Bowlers were divided into four speed groups: slow-medium, medium, medium-fast, and fast. The mean centre of mass velocity at back foot contact (run-up speed) was 5.3 ± 0.6 m/s. Centre of mass velocity at back foot contact was significantly faster in the fastest two bowling groups compared to the slow-medium bowling group. In addition, stepwise multiple regression analysis showed that the centre of mass deceleration over the delivery stride phase was the strongest predictor of ball speed in the faster bowling groups. In conclusion, centre of mass kinematics are an important determinant of ball speed generation in fast bowlers. In particular, bowlers able to coordinate their bowling action with periods of centre of mass deceleration may be more likely to generate high ball speed. 相似文献
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Bruce C. Elliott 《Journal of sports sciences》2013,31(12):983-991
Here, I review research that has investigated the aetiology of injuries experienced by adolescent and adult fast bowlers. Mechanical factors play an important role in the aetiology of degenerative processes and injuries to the lumbar spine. This is particularly so in fast bowling, where a player must absorb vertical and horizontal components of the ground reaction force that are approximately five and two times body weight at front-foot and rear-foot impact, respectively. Attenuated forces are transmitted to the spine through the lower limb, while additional foces at the lumbo-sacral junction are caused by trunk hyperextension, lateral flexion and twisting during the delivery stride. Fast bowlers are classified as side-on, front-on or mixed. The mixed action is categorized by the lower body configuration of the front-on action and the upper body configuration of the side-on technique. This upper body configuration is produced by counter-rotation away from the batsman in the transverse plane about the longitudinal axis of the body of a line through the two shoulders. Counter-rotations of 12–40° during a delivery stride have predicted an increased incidence of lumbar spondylolysis, disc abnormality and muscle injury in fast bowlers. During the delivery stride, the mixed bowling action also shows: more lateral flexion and hyperextension of the lumbar spine at front-foot impact, and a greater range of motion of the trunk over the delivery stride when compared with the side-on and front-on techniques. The pars interarticularis of each vertebra is vulnerable to injury if repetitive flexion, rotation and hyperextension are present in the activity. Fast bowlers should reduce shoulder counter-rotation during the delivery stride to reduce the incidence of back injuries. When a player is required to bowl for extended periods irrespective of technique, overuse is also related to an increased incidence of back injuries and must be avoided. 相似文献