The impact of start strategy on start performance in alpine skiing exists on flat,but not on steep inclines     

Matej Supej  Niels J. Nedergaard  Joakim Nord  Hans-Christer Holmberg 《Journal of sports sciences》2019,37(6):647-655

Here, we explored the relationship between incline and start strategy during alpine skiing. Eight FIS skiers performed starts on a flat (3°) and steep (21°) incline employing five different strategies. Their times, trajectories and velocities were monitored with a GNSS system and video. A significant interaction was observed between slope incline and start strategy with respect to the skier’s exit velocity (p < 0.001, ?²_p = 0.716), but not for the start section time (p = 0.732, ?²_p = 0.037). On the almost flat incline, both section time (p = 0.022, ?²_p = 0.438) and exit velocity (p < 0.001, ?²_p = 0.786) were influenced significantly by start strategy, with four V2 skate-pushes being optimal. On the steep incline, neither section time nor exit velocity was affected significantly by start strategy, the fastest section time and exit velocity being attained with four and two V2 skate-pushes, respectively. In conclusion, these findings demonstrate that the start strategy exerts considerable impact on start performance on almost flat inclines, with strategies involving three or more V2 skate-pushes being optimal. In contrast, start performance on the steep incline was not influenced by strategy.  相似文献   

Comparing para-rowing set-ups on an ergometer using kinematic movement patterns of able-bodied rowers     

B. Cutler  T. Eger  T. Merritt 《Journal of sports sciences》2017,35(8):777-783

While numerous studies have investigated the biomechanics of able-bodied rowing, few studies have been completed with para-rowing set-ups. The purpose of this research was to provide benchmark data for handle kinetics and joint kinematics for able-bodied athletes rowing in para- rowing set-ups on an indoor ergometer. Able-bodied varsity rowers performed maximal trials in three para-rowing set-ups; Legs, Trunk and Arms (LTA), Trunk and Arms (TA) and Arms and Shoulders (AS) rowing. The handle force kinetics of the LTA stroke were comparable to the values for able-bodied literature. Lumbar flexion at the catch, extension at the finish and total range of motion were, however, greater than values in the literature for able-bodied athletes in the LTA set-up. Additionally, rowers in TA and AS set-ups utilised more extreme ranges of motion for lumbar flexion, elbow flexion and shoulder abduction than the LTA set-up. This study provides the first biomechanical values of the para-rowing strokes for researchers, coaches and athletes to use while promoting the safest training programmes possible for para-rowing.  相似文献   

蛙泳基本技术MMCAI课件的研制   总被引：6，自引：2，他引：4  

阮怀云  陆伯珩 《广州体育学院学报》1999,(1)

结合现代教育技术理论 ,开发研制出符合游泳教学特点 ,图、文、声、像、动并茂的多媒体教学软件 ,以弥补游泳传统教学手段的不足和填补了国内体育术科教学CAI课件的空白  相似文献   

花样游泳辅助性练习对游泳运动员划频划幅影响初探     

张洁  曲明  孔德佳  汪斌 《辽宁体育科技》2008,30(4)

通过对游泳运动员在训练中增加花样游泳划水辅助性练习,以及对训练前后分段成绩、划频和划幅的比较研究,结果发现：在游泳训练中增加花样游泳辅助性练习可以显著提高运动员划幅质量,从而促进运动成绩的提高。  相似文献   

PNF技术在脑卒中康复治疗中的研究进展     

吴雨涵  王庆杰  邱凤霓 《体育科技文献通报》2022,(2):98-99+103

改革开放以来,康复治疗学发展迅速,国际上常用的一些物理治疗的方法,也逐渐传到国内,并且在临床上应用,PNF技术作为一种源自国外的神经发育疗法,也被广泛应用在神经康复中。脑卒中作为一种典型的神经系统受损的临床综合征,其康复治疗是一项研究的重点。近年来,关于PNF技术与脑卒中康复治疗的研究越来越多,但当前的研究过于集中。本文回顾了近十年来有关PNF技术在脑卒中康复治疗中的有关研究,介绍了PNF技术的临床治疗效果、大体的研究方向和研究进展。  相似文献   

基于斜率式联机手写汉字笔画识别法的改进     

李锟华 《中国科技信息》2006,(20):135-137

本文对联机手写输入汉字笔画的坐标数据进行分析，把笔画所有X坐标数据组成X数据流，把笔画所有y坐标数据组成y数据流，绘制出X数据流和y数据流的二维坐标图，把笔画八个方向的识别转换成三个方向识别，对传统斜率式汉字笔画识别法进行改进，来提高汉字笔画识别率。  相似文献   

现代蝶泳技术发展特点(上)     

郑闽生  吴奇六 《体育科学》1996,(4)

近年蝶泳正朝着加快频率、减少阻力的技术方向发展,特别是以潘克拉托夫为代表的出发、转身后采用海豚式打腿的技术,打破了保持长达八年的男子100米蝶泳纪录,证明这一技术的成熟与合理。本文以一些优秀蝶泳运动员的技术特点为研究对象,用比较、分析的方法,探求近年蝶泳技术的发展特点,供广大教动员参考。  相似文献   

论《文心雕龙·定势》篇的"势"     

庞光华 《五邑大学学报(社会科学版)》2007,9(4):59-62

《文心雕龙》是我国文学理论史上最重要的名著之一,关于其中《定势》篇中势的理论内涵,学术界有不同的理解。《文心雕龙·定势》篇中"势"的理论有着广泛而长久的文化史基础,只有通过考察《文心雕龙》与书法艺术理论的联系,才能准确把握"势"的含义。  相似文献   

偏置曲柄滑块机构的优化设计     

丁伟 《重庆职业技术学院学报》2008,17(5):106-107

在传统图解法的基础上,运用文献【1】中的设计原理,推导出在满足给定的滑块行程和行程速度变化系数的条件下,使偏置曲柄滑块机构的最小传动角达到最大（最佳传动角）的优化设计方法。  相似文献   

传统工笔人物画兴衰的文化语境解读     

申海波 《临沂师范学院学报》2004,26(2):139-142

工笔人物画是中国画乃至中国文化的重要组成部分，研究中国工笔人物画的兴衰历程，从工笔人物画历史消长的纵向脉络以及各个发展阶段工笔人物画与文化语境的横向比较入手，探讨工笔人物画与所处时代文化语境的关系，找出其兴衰的文化根源，为当代多元文化语境下的工笔人物画创作提供借鉴。  相似文献