中英两国乒乓球理论中击球动作构成要素的比较分析     

唐建军 《北京体育大学学报》1996,(1)

根据运动技能学习理论和乒乓球运动相互制约的规律，首次从理论上比较分析了中英两国乒乓球击球动作的构成要素及其概念与划分方法的异同，对我国乒乓球技术的教学、训练具有一定的参考价值。  相似文献   

关于字典编纂创新的思考和作为     

杨继本 《湖南师范大学教育科学学报》2006,5(1):124-128

字典编纂势须与时俱进,开拓创新,适应社会需要和时代发展水平。本研究主要着意和致力于将文字学、信息学、教学论、教育学,特别是心理学的有关观点、概念应用于字典的查字及输入方法和正文本体的编纂中,以增进字典的确切性、实用性和速检性实效(本研究的要领可见之于《汉字信息教学与输入字典》,知识产权出版社,2005)。  相似文献   

Mechanisms underlying reductions in stroke volume at rest and during exercise at high altitude     

Mike Stembridge  Philip N. Ainslie  Rob Shave 《European Journal of Sport Science》2016,16(5):577-584

High-altitude exposure challenges the cardiovascular system to maintain oxygen delivery to the mitochondria under conditions of hypoxic stress. Following acclimatisation (3–5 days), stroke volume (SV) falls to below sea-level values but heart rate remains elevated, such that cardiac output is maintained compared to sea level. The decrease in SV has been a topic of research for over 40 years, but the underlying mechanisms are incompletely understood. Impaired systolic contractile function secondary to reduced coronary arterial oxygen tension has been investigated as a potential cause for the decrease in SV. However, despite in vitro evidence of impaired cardiac contractile force in severe hypoxia, the majority of studies to date have reported enhanced in vivo ventricular systolic function at rest and during exercise in humans up to and above 5000?m. However, the elevated function observed at rest has recently been suggested to reduce the functional reserve available during exercise. While in vivo systolic function appears enhanced at high altitude, a decrease in left ventricular end-diastolic volume (EDV) and altered filling patterns of both ventricles has been observed. The reduction in ventricular filling will undoubtedly affect SV, and four potential mechanisms have been proposed to explain the reduction in left ventricular filling. In this article, both historical and recent reports of systolic function at high altitude will be reviewed, and evidence supporting and refuting each of the four mechanisms underpinning reduced left ventricular filling will be discussed.  相似文献   

微课教育在脑卒中后遗症偏瘫患者照顾者压疮控制中的应用效果     

张彩虹  刘晓霞  张瑞芸  夏明  魏婷  刘娟  张丽萍  艾娟  张晓红 《教育教学论坛》2019,(27):176-177

探讨微课教育在脑卒中后遗症偏瘫患者照顾者压疮控制中的应用效果,比较两组患者出院时压疮好转率、干预12周后压疮发生率及两组照顾者的压疮知信行水平。  相似文献   

论易通输入法与最佳四键一字汉字形码输入法的关系   总被引：2，自引：1，他引：1  

徐祖华 《保山师专学报》2008,27(5):63-73

讨论确定易通输入法编码质量的四要素与确定最佳四键一字汉字形码输入法编码质量的四要素间的关系,论证易通输人法与最佳四键一字汉字形码输入法的关系是：易通输入法的研究已找到获取最佳四键一字汉字形码输入法的必用工具和必用办法,易通输入法与最佳四键一字汉字形码输入法的差距已经不大,且其差距都基本产生于对编码质量影响不大的不确定因素,最佳四键一字汉字形码输入法只宜在易通输入法的基础上通过修改对编码质量影响不大的次要做法获得。  相似文献   

汉字的笔画特点与外国学生汉字笔画偏误   总被引：2，自引：0，他引：2  

郭圣林 《暨南大学华文学院学报》2008,(4):63-69

本文从笔画的角度分析外国学生汉字书写偏误。在分析汉字笔画的笔形特点、笔向特点和笔际关系之后,文章把汉字笔画习得偏误分为笔形偏误、笔向偏误、笔际关系偏误、笔画数目偏误,并对其原因进行了分析。  相似文献   

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   

脑卒中患者康复治疗依从性研究进展   总被引：3，自引：0，他引：3  

盛晗  邵圣文  王惠琴  陈金花 《湖州师范学院学报》2015,(4):81-85

通过依从性高低的利弊、影响因素、护理措施及依从性的波动性等方面对脑卒中患者康复治疗的依从性现况进行综述,结果发现：高依从性能够促进脑卒中患者的疾病自护能力,提高患者的生活质量,降低患者复发的风险;低依从甚至不依从,可能导致脑卒中患者再次卒中、“二次损伤”及再次住院;脑卒中患者康复治疗依从性的影响因素主要包括社会因素、家庭因素、个人因素、医院因素等;可采取加强监督、信息化技术及综合干预等措施提高脑卒中患者康复治疗依从性;脑卒中患者的康复治疗依从性随着疾病处于不同阶段而发生波动,临床医护人员应结合患者给予个性化的干预措施。脑卒中患者康复治疗依从性是一个动态变化的过程,需要医护人员不断跟进和观测。  相似文献   

快行时脑卒中患者与健康人下肢肌肉活动差异     

马静  陈谦 《浙江体育科学》2012,34(4):117-120

目的:探讨快速步行时,脑卒中患者与健康被试下肢肌肉在活动持续时间百分比、AEMG、MPF、复杂度等指标上的差异。方法:男性脑卒中患者10名及健康对照组被试10名,按照步长40cm步频60次/min的不同步速在平地上直线行走8步,采集患者偏瘫侧及健康被试对照侧胫骨前肌、内侧腓肠肌、股直肌、股二头肌的肌电信号,并利用足底步态开关记录行走过程中的步态周期。结果:①患者胫骨前肌在摆动期、内侧腓肠肌在摆动期及第一次双侧支撑期的活动持续时间均显著长于健康被试;②患者胫骨前肌及股二头肌的平均肌电值增加,股直肌的平均功率频率下降率变小。  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