当前世界女子高低杠项目成套动作难度特征分析   总被引：1，自引：1，他引：1  

金力  刘革  孟宪林 《天津体育学院学报》2007,22(3):269-271

以第39届世界体操锦标赛的女选手为研究对象，对新规则实施后世界女子高低杠发展特点进行研究。结果显示：成套动作的平均难度为6．638分，位居4项之首，仍有继续提高的空间；其中飞行动作的难度变化不大，连接价值提高；从低杠换握高杠大多以B组动作为主，从高杠换握低杠则以D组为主；上法开发了挺身跳起成低杠手倒立的D组难度，且有连接动作加难的趋势；下法动作继续呈现多样化特征：今后的主要任务是提高完成动作的成功率和动作质量，重点提高动作细节和下法的稳定性。  相似文献   

Comparison of step-by-step kinematics of resisted,assisted and unloaded 20-m sprint runs     

Roland van den Tillaar  Paul Gamble 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(5):539-552

This investigation examined step-by-step kinematics of sprint running acceleration. Using a randomised counterbalanced approach, 37 female team handball players (age 17.8 ± 1.6 years, body mass 69.6 ± 9.1 kg, height 1.74 ± 0.06 m) performed resisted, assisted and unloaded 20-m sprints within a single session. 20-m sprint times and step velocity, as well as step length, step frequency, contact and flight times of each step were evaluated for each condition with a laser gun and an infrared mat. Almost all measured parameters were altered for each step under the resisted and assisted sprint conditions (η² ≥ 0.28). The exception was step frequency, which did not differ between assisted and normal sprints. Contact time, flight time and step frequency at almost each step were different between ‘fast’ vs. ‘slow’ sub-groups (η² ≥ 0.22). Nevertheless overall both groups responded similarly to the respective sprint conditions. No significant differences in step length were observed between groups for the respective condition. It is possible that continued exposure to assisted sprinting might allow the female team-sports players studied to adapt their coordination to the ‘over-speed’ condition and increase step frequency. It is notable that step-by-step kinematics in these sprints were easy to obtain using relatively inexpensive equipment with possibilities of direct feedback.  相似文献   

基于模糊综合评价法的航班延误服务补救质量评价研究     

周海滨  张圣亮 《科技管理研究》2010,(17)

以民航业为例,通过建立评价指标,运用模糊综合评价法对如何评价服务补救质量进行了量化,并具体指出了各个指标对于航班延误服务补救质量的重要性程度,可以有效地指导航空公司提升航班延误后的服务补救质量,并为企业测评其服务补救质量提供借鉴和参考.  相似文献   

跳远旋转特点及起跳能力与腾空技术的关系探析     

张茂泉 《体育科技文献通报》2010,18(7):21-22

跳远时摆动腿无积极的快速摆动与制动动作与起跳后身体明显前旋运动趋势都会影响跳远成绩,所以,有必要对跳远起跳时的前旋特点和起跳能力与腾空技术进行探讨,以期对跳远教练的教学有所帮助,提高运动员的跳远成绩。  相似文献   

The effect of westward travel across five time zones on sleep and subjective jet-lag ratings in athletes before and during the 2015’s World Rowing Junior Championships     

Sarah Kölling  Gunnar Treff  Kay Winkert  Alexander Ferrauti  Tim Meyer  Mark Pfeiffer 《Journal of sports sciences》2017,35(22):2240-2248

This study examined sleep-wake habits and subjective jet-lag ratings of 55 German junior rowers (n = 30 male, 17.8 ± 0.5 years) before and during the World Rowing Junior Championships 2015 in Rio de Janeiro, Brazil. Athletes answered sleep logs every morning, and Liverpool John Moore’s University Jet-Lag Questionnaires each evening and morning. Following an 11-h westward flight with 5-h time shift, advanced bedtimes (?1 h, P < .001, η_p² = 0.68), reduced sleep onset latency (P = .002, η_p² = 0.53) and increased sleep duration (P < .001, η_p² = 0.60) were reported for the first two nights. Jet-lag symptoms peaked upon arrival but were still present after 6 days. Sleep quality improved (P < .001, η_p² = 0.31) as well as some scales of the Recovery-Stress Questionnaire for Athletes. Participation was successful as indicated by 11 of 13 top 3 placings. Overall, the initial desynchronisation did not indicate negative impacts on competition performance. As travel fatigue probably had a major effect on perceptual decrements, sleep during travel and time to recover upon arrival should be emphasised. Coaches and practitioners should consider higher sleep propensity in the early evening by scheduling training sessions and meetings until the late afternoon.  相似文献   

男子跳马前手翻空翻类高难动作的第一腾空及推手技术研究   总被引：1，自引：0，他引：1  

袁志华 《成都体育学院学报》1995,(3)

跳马前手翻空翻类高难动作是跳马的一个发展方向和重点，有重要的地位。为在前人研究基础上对这类技术进行更深入、系统的研究探讨，了解其内在结构和一般规律，笔者以在１１届亚运会上成功完成的动作为研究样本，对其第一腾空和推手技术作了较全面、深入的探讨，并较详细地分析了影响技术完成的主要参数间的相互关系，提供了一批运动学参数，对于深入研究和发展完善该类动作技术有重要现实意义。  相似文献   

单杠上飞行动作撒手技术的运动学分析     

朱昌义 《福建体育科技》2001,20(2):23-25,29

着重从人体多环节链的相对运动来分析撒手时人体质心运动和翻转角动量的大小 ,并推导出了理论计算公式。研究认为 ,人体质心运动与翻转角动量大小由各环节之间复杂的相对运动关系所决定 ,随着人体运动环节数目的增加 ,分析这些环节的相对运动对人体质心运动和角动量的协同作用效果 ,将变得十分复杂。  相似文献   

风对标枪飞行初始条件及远度的影响   总被引：4，自引：0，他引：4  

李远乐  王倩  李春雷 《中国体育科技》2002,38(7):19-20

根据标枪气动力风洞实验的数据 ,建立数学模型对不同风向和风速条件下的标枪飞行远度和最佳初始条件进行了计算机模拟计算和分析 ,为标枪运动员和教练员了解在有风条件下标枪的最佳出手角度和飞行远度的变化提供了定量数据  相似文献   

对竞走比赛中腾空犯规的研究     

金荣驹 《上海体育学院学报》1990,(1)

腾空犯规是我国竞走枝术存在的主要问题。本文通过对高速摄影影片解析和国际重大比赛中高水平运动员有关数据的分析,认为其原因主要是支撑时间与摆动时间不平衡,人体重心垂直位移过大以及战术运用和体力分配不当。  相似文献   

论提高学生语言表达能力对体育教育的潜在作用     

魏亚栋  林松 《北京体育大学学报》1998,(4)

做一名合格的体育教师应具备准确而流畅的语言表达能力,通过对天津、沈阳两体院92级实习学生进行问卷调查,分析了他们对室内理论课产生畏惧心理的原因,而提出在传统的运动心理学教学基础上着重发展学生思维和语言表达能力,以对其今后从事体育教学能起到潜在的积极作用。  相似文献