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Craig Ranson Jonathan George James Rafferty John Miles Isabel Moore 《Journal of sports sciences》2018,36(21):2393-2398
Artificial rugby union playing surface installation is increasing. This prospective cohort study aimed to examine the effect of playing surface on match injury types within 157 players of two UK professional rugby union clubs playing 209 matches (96 on artificial surfaces and 113 on grass) over three seasons. There was no difference in overall injury risk between the two playing surfaces with injury incidence on artificial 80.2 (CI 69.9–91.7) and on grass 81.9 per 1000 match-hours (CI 72.2–92.5), with an incidence rate ratio (RR) of 0.98 (CI 0.82–1.17). There was a higher rate of concussion (RR 0.52, CI 0.34 – 0.78) and chest injuries on grass (RR 0.26 CI 0.07, 0.95), and a higher rate of thigh haematoma (RR 2.25, CI 1.05–4.82) foot injuries (RR 4.12, CI 1.10, 15.40) and injury to players being tackled (RR 1.46, CI 1.00, 2.15) on artificial. Whilst there was no higher injury risk for matches played on artificial versus natural grass surfaces, the higher incidence of concussion and chest injury on grass, and the higher rate of foot injuries on artificial surfaces may be related to tackle and footwear-to-surface interface factors. 相似文献
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《现代汉语词典》（第六版）的编撰结合了现当代语言科学发展的成果,在排序、选词、释义、引文上具有鲜明典范的特征。随着当代科技的进步,对照欧美词汇学发展的成果,《现代汉语词典》在选词、释义上出现了片面性、滞后性、高雅化、脱离生活等问题。这些问题的解决有赖于对先进的信息技术、语言学理论的吸收。从具体编撰实际上加以改进。 相似文献
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The relationship between bowling action classification and three-dimensional lower trunk motion in fast bowlers in cricket 总被引：1，自引：1，他引：0
Lower back injuries, specifically lumbar stress fractures, account for the most lost playing time in professional cricket. The aims of this study were to quantify the proportion of lower trunk motion used during the delivery stride of fast bowling and to examine the relationship between the current fast bowling action classification system and potentially injurious kinematics of the lower trunk. Three-dimensional kinematic data were collected from 50 male professional fast bowlers during a standing active range of motion trial and three fast bowling trials. A high percentage of the fast bowlers used a mixed bowling action attributable to having shoulder counter-rotation greater than 30 degrees. The greatest proportion of lower trunk extension (26%), contralateral side-flexion (129%), and ipsilateral rotation (79%) was used during the front foot contact phase of the fast bowling delivery stride. There was no significant difference in the proportions of available lower trunk extension, contralateral side-flexion, and ipsilateral rotation range of motion used during fast bowling by mixed and non-mixed action bowlers. Motion of the lower trunk, particularly side-flexion, during front foot contact, in addition to variables previously known to be related to back injury (e.g. shoulder counter-rotation), should be examined in future cross-sectional and prospective studies examining the fast bowling action and low back injury. 相似文献
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通过对广东省高科技企业员工的问卷调查,探讨人力资源管理实践、组织支持感与员工敬业度的关系。研究结果表明,人力资源管理实践和组织支持感对员工敬业度产生直接或间接的影响;组织支持感在人力资源管理实践对员工敬业度的影响中起完全中介作用。 相似文献
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本文从云南多民族,民族分布地域广,民族地区经济文化相对落后这一现状出发,通过对一些民族地区现代教育技术发展现状调研结果、存在问题的分析,作者认为,教育技术理论在云南这样多民族地区的实践离不开少数民族。与内地及发达地区教育技术的理论与实践相比,云南民族地区教育技术理论与实践有其特点、难度。作者同时认为云南民族地区教育技术理论与实践是迫切需要的,又是极其重要的,根据云南民族地区的特点,现代教育理论与实 相似文献
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Abstract High ground reaction forces during the front foot contact phase of the bowling action are believed to be a major contributor to the high prevalence of lumbar stress fractures in fast bowlers. This study aimed to investigate the influence of front leg technique on peak ground reaction forces during the delivery stride. Three-dimensional kinematic data and ground reaction forces during the front foot contact phase were captured for 20 elite male fast bowlers. Eight kinematic parameters were determined for each performance, describing run-up speed and front leg technique, in addition to peak force and time to peak force in the vertical and horizontal directions. There were substantial variations between bowlers in both peak forces (vertical 6.7 ± 1.4 body weights; horizontal (braking) 4.5 ± 0.8 body weights) and times to peak force (vertical 0.03 ± 0.01 s; horizontal 0.03 ± 0.01 s). These differences were found to be linked to the orientation of the front leg at the instant of front foot contact. In particular, a larger plant angle and a heel strike technique were associated with lower peak forces and longer times to peak force during the front foot contact phase, which may help reduce the likelihood of lower back injuries. 相似文献
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本阐述了《机械设计基础》的教学对高职学生学习的重要性，总结该课程新的教学特点和过程，为后续课程打下好的基础。 相似文献
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伴随教育向人自身的回归，课程功能转向为儿童提供发展机会。儿童的需要成为课程开发的起点和归宿。本文以梅里课程、超市课程、助学课程的开发为案例，诠释了课程如何尊重和满足儿童的差异性特点和多样性需求，如何多维度地通过与儿童的对话和合作，为儿童提供更多的课程选择权利，从而使儿童的个性得到更充分更主动的发展。 相似文献
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Stewart Ranson 《教育政策杂志》2013,28(3):205-222
This paper considers models for the future government of education. It is proposed that choice will reflect dominant values about the future purpose, role and organization of education in a context of structural change in economy and society. Three models are discussed: one seeking to strengthen the government from the centre, another to strengthen the institution, while a further model argues for stronger local government of education. Conclusions propose that while effective government will require the virtues of each model, an extension of local democracy and citizen participation provides the best conditions for a learning society over the next decade. 相似文献