排序方式： 共有76条查询结果，搜索用时 304 毫秒
11.
Antoine Fortier René A. Turcotte 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(4):341-350
Ice hockey requires rapid transitions between skating trajectories to effectively navigate about the ice surface. Player performance relates in large part to effective change-of-direction manoeuvres, but little is known about how those skills are performed mechanically and the effect of equipment design on them. The purpose of this study was to observe the kinetics involved in those manoeuvres as well as to compare whether kinetic differences may result between two skate models of varying ankle mobility. Eight subjects with competitive ice hockey playing experience performed rapid lateral (90°) left and right change-of-direction manoeuvres. Kinetic data were collected using force strain gauge transducers on the blade holders of the skates. Significantly greater forces were applied by the outside skate (50–70% body weight, %BW) in comparison to the inside skate (12–24%BW, p < 0.05). Skate model and turn direction had no main effect, though significant mixed interactions between leg side (inside/outside) with skate model or turn direction (p < 0.05) were observed, with a trend for left-turn dominance. This study demonstrates the asymmetric dynamic behaviour inherent in skating change-of-direction tasks. 相似文献
12.
对北京市6所普通高校43名男篮队员的专项身体素质进行测评,经因子分析和回归分析等方法筛选出了影响运动训练水平的30m起动跑、助跑摸高、穿梭跑、28m×10折返跑等4个有效因子,并进一步提出了简易综合评定方法,为大学生男篮运动员身体训练水平评定提供了参考依据。 相似文献
13.
程勇民 《山东体育学院学报》2000,16(1):31-34
通过对１６５名速射与慢射运动员肤纹特征的比较研究,揭示了两类项目优秀运动员的肤纹特征,并首次提出滨中褶指标与运动员的心理品质有关,同时还发现指纹系数、ａ－ｂ嵴线、ａｔｄ角三指标与人的灵敏素质有关。 相似文献
14.
IT能力与企业可持续发展绩效的关系研究——以业务流程敏捷性为中介变量 总被引：1，自引：0，他引：1
信息技术（IT）的快速发展对于实现企业的可持续发展机遇与挑战并存。信息技术的运用一方面会导致能源消耗、社会分化,另一方面绿色技术创新也为可持续发展提供了现实可能。但现有文献对IT能力的可持续发展价值及其过程研究较为匮乏。本文根据资源基础观,构建企业可持续发展绩效的整合模型。以214家汽车制造企业为样本,运用结构方程模型实证分析了IT能力对经济、社会和环境多层面可持续发展绩效的全面影响及其内在机制。实证结论发现IT能力有助于提升企业整体绩效表现,促进可持续发展绩效;业务流程敏捷性是IT能力重塑企业的关键环节,对于IT能力与可持续发展绩效之间的关系具有显著的中介效应。最后,本文基于上述研究发现提出相应的管理启示和未来方向。 相似文献
15.
Michael G. Hughes Laurence Birdsey Rob Meyers Daniel Newcombe Jon Lee Oliver Paul M. Smith 《Journal of sports sciences》2013,31(8):878-886
Abstract In spite of the increased acceptance of artificial turf in football, few studies have investigated if matches are altered by the type of surface used and no research has compared physiological responses to football activity on artificial and natural surfaces. In the present study, participants performed a football match simulation on high-quality artificial and natural surfaces. Neither mean heart rate (171 ± 9 beats · min?1 vs. 171 ± 9 beats · min?1; P > 0.05) nor blood lactate (4.8 ± 1.6 mM vs. 5.3 ± 1.8 mM; P > 0.05) differed between the artificial and natural surface, respectively. Measures of sprint, jumping and agility performance declined through the match simulation but surface type did not affect the decrease in performance. For example, the fatigue index of repeated sprints did not differ (P > 0.05) between the artificial, (6.9 ± 2.1%) and natural surface (7.4 ± 2.4%). The ability to turn after sprinting was affected by surface type but this difference was dependent on the type of turn. Although there were small differences in the ability to perform certain movements between artificial and natural surfaces, the results suggest that fatigue and physiological responses to football activity do not differ markedly between surface-type using the high-quality pitches of the present study. 相似文献
16.
付扬 《中国现代教育装备》2013,(13):49-51
电类基础课是工科各专业重要的基础课程,对学生能力的培养起到至关重要的作用。通过多年电类基础课程的教学实践和探索,认为对于学生能力的培养,首先应重视创造性思维的培养,针对学生创造性思维的培养,教学中应注重探索式教学、启发式教学和分析与综合式教学,以培养思维的独创性、灵活性和综合性。 相似文献
17.
试论运动灵敏性的概念及其分类 总被引：2，自引：0，他引：2
从生理学、心理学和词义学视角对运动灵敏性进行解读,运用逻辑论证和统计学论证的方法对运动中的灵敏性概念和分类问题进行探讨后认为,体育运动中的灵敏性定义为处在特定运动场景中的肢体感受刺激,并根据需要迅速改变方向或变换动作的能力.并将运动灵敏性分为判断与决策能力、变换动作能力和改变方向能力三类. 相似文献
18.
傅森 《开封教育学院学报》2010,30(1):108-110
高职体育教学改革应在增强学生身心素质的同时,有针对性地提出干预措施,以提升学生对岗位工作环境的适应能力;还应将学生体育技能的形式与学生胜任职业所需的体能训练结合起来,增强学生就业与从业的竞争力。 相似文献
19.
范旭东 《广州体育学院学报》2012,32(1):90-93
伴随我国国民体质监测工作的深入开展,大量有关国民体质监测的仪器设备投入实际应用.但从调查结果来看,目前国民体质监测设备中尚缺少及便携性、有效性、科学性、有效性于一体的有关机体灵敏素质的测试设备,成为灵敏素质测试仪开发的实际动因,并在仪器样机完成后,针对大学生群体构建了该设备的评价标准体系,以期为我国国民体质监测与评价工作贡献绵薄. 相似文献
20.
供应链敏捷性的以往研究忽视了供应链企业间竞合关系的存在,且集体横向竞合对供应链敏捷性的影响及其作用机制仍不清晰。本文基于动态能力理论、社会网络理论以及组织学习理论,深入探讨了集体横向竞合对公司供应链敏捷性的影响机制。采用Bootstrap检验方法对216份专业市场中大型企业的问卷开展实证研究发现：集体横向竞合能直接或间接地对供应链敏捷性产生正向且显著的影响。集体横向竞合与供应链敏捷性之间存在三条中介路径,其中网络嵌入性中介路径对供应链敏捷性的影响最大,其次是组织学习能力中介路径,而网络嵌入性与组织学习能力的链式中介路径对供应链敏捷性的影响最小,且网络嵌入性是集体横向竞合与组织学习能力之间的唯一中介。 相似文献