排序方式： 共有99条查询结果，搜索用时 31 毫秒
21.
Claudia Kozman 《Journalism Practice》2017,11(6):777-797
This study explored frames in the coverage of the steroids issue in baseball through a content analysis of traditional and new media. Using issue-specific and generic frames, it proposed a hybrid measurement tool that combines both approaches. Findings of the principal component analysis indicate the media framed the steroids issue primarily in terms of conflict and policy. Significant differences emerged between traditional and new media, on the one hand, and between the news and sports media, on the other. Besides these frames, the media also presented the steroids story as a public opinion and morality issue, using organizational officials, the public, and the media to convey these frames. 相似文献
22.
Major League Baseball (MLB) has proposed rule changes to speed up baseball games. Reducing the time between pitches may impair recovery from fatigue. Fatigue is a known precursor to injury and may jeopardise joint stability. This study examined how fatigue accumulated during baseball games and how different pace of play initiatives may influence fatigue. Pitcher data were retrieved from a public database. A predictive model of muscle fatigue estimated muscle fatigue in 8 arm muscles. A self-selected pace (22.7 s), 12 s pace (Rule 8.04 from the MLB) and a 20 s rest (a pitch clock examined in the 2014 Arizona Fall League (AFL)) were examined. Significantly more muscle fatigue existed in both the AFL and Rule 8.04 conditions, when compared to the self-selected pace condition (5.01 ± 1.73%, 3.95 ± 1.20% and 3.70 ± 1.10% MVC force lost, respectively). Elevated levels of muscle fatigue are predicted in the flexor–pronator mass, which is responsible for providing elbow stability. Reduced effectiveness of the flexor–pronator mass may reduce the active contributions to joint rotational stiffness, increasing strain on the ulnar collateral ligament (UCL) and possibly increasing injury risk. 相似文献
23.
Yu-Pin Liang Yi-Liang Kuo Hsiang-Chin Hsu Yen-Ysung Hsia Ya-Wen Hsu 《Journal of sports sciences》2019,37(5):544-552
Sports injuries are common among baseball players and may result in abnormal movement patterns, increased risks of future injury, and unsatisfactory performance. The Functional Movement Screen (FMS?) has been developed to detect abnormal functional movement patterns and can be used for predicting risks of sports injury. However, whether FMS? scores are associated with athletic performance remains unclear. The goal of this study was to determine the association between functional movements and athletic performance in elite baseball players. Core stability, muscular strength and flexibility of the lower extremities, and FMS?, as well as athletic performance in sprinting, agility, and balance tests were assessed in 52 male collegiate Division I baseball players placed into two groups based on FMS? scores. The high-scoring group demonstrated better athletic performance than the low-scoring group, with a shorter duration of the agility test. No group differences were found in core stability, muscular strength, or muscle flexibility, except for rectus femoris flexibility. Thus, the FMS? score is associated with sprinting and agility performance in elite baseball players. These findings indicate that the FMS? may have a role in predicting athletic performance and thereby help determine the goals of training regimens or return-to-play strategies. 相似文献
24.
从伦敦奥运套开始,棒球不再是奥运会正式比赛项目。2005年10月7日,一际奥委会应国际棒联的要求,公布了新加坡全全项目设置投票结果,棒球项目因50票支持、54票反对,以4票之差被排除出2012年伦敦奥运会。同样,棒球无缘2016年奥运会,这些决定给世界棒球运动的发展带来了严峻的挑战。为什么国际奥委会做出这一决定,作者通过广泛地查阅资料,就棒球退出奥运会的原因进行探讨和分析,并进行归纳和总结。 相似文献
25.
本文采取现场统计与借阅棒球比赛记录表的办法,对我市少年棒球队参加第七届泛太平洋国际少年软式棒球锦标赛的比赛情况进行分析,以期找出我市少年棒球队存在的问题,为教练员、运动员在以后的训练中提供依据,为今后的训练工作找出方向。 相似文献
26.
27.
28.
在棒球击球中,有两种不同的技术,一种强调身体的转动,另一种强调转动与线运动的结合。本文利用三维高速录象分析系统与测力台采集和分析两组不同技术类型的击球手的有关数据。结果表明,击球手向前的线运动与髋部转动的结合为产生较高的击球速度及快速起动跑垒提供了良好的基础。该研究将有助于棒球击球的改进与完善。 相似文献
29.
前扑滑垒是棒球运动的一项重要技术,能否正确运用该技术会对棒球比赛的攻守行为产生直接的影响。在全国十运会棒球比赛中,前扑滑垒技术被各运动队广泛运用,进攻上收到了良好的效果,降低了被触杀的风险。但同时存在前扑滑垒动作不规范、技术失误过多、上垒率下降等不足,给运动员埋下了损伤的隐患。在查阅文献资料、采访知名教练的基础上,利用技术统计资料,结合自身运动和裁判实践的经验,对前扑滑垒技术进行分析研究,归纳和总结其动作要点及训练方法。 相似文献
30.
垒球运动中投手与击球员的相对关系 总被引：1，自引：0，他引：1
陈载营 《军事体育进修学院学报》2008,27(4)
击球员击球技术是具有很多不稳定因素的被动进攻技术,而防守技术中的投球技术具有相对稳定性,并带有进攻性。既然击球技术具有相对性,其理论必然带有相对性和多样性。这是因为投手投出球的变化因素很多,对击球技术要求较高。投球技术的多样性必然导致击球技术的多样性。 相似文献