Two-Handed Movement Control     

Daniel M. Corcos 《Research quarterly for exercise and sport》2013,84(2):117-122

Abstract

The purpose of this study was to investigate the discrepancy between the finding that when two hands make movements to targets of different distances, they have the same movement time (Kelso, Southard & Goodman, 1979a, b) and the finding that they have different movement times (Marteniuk & MacKenzie, 1980). The present experiment shows that when the ratio of the distance traveled by the two hands is 4:1, they do not take the same time. The hand moving the shorter distance lakes less time, although it takes more lime than when moving alone or when moving the same distance as the other hand. This finding is highlighted when individual data are examined. It appears that there is no difference between using homologous or nonhomologous muscle groups.  相似文献   

论时空变化与篮球运动的发展     

唐士敏 《体育科技文献通报》2013,21(1):49-50,106

时间和空间在篮球运动中有着明确的规定,二者的辩证关系广泛地存在于篮球比赛的技术和战术之中.篮球规则的修改是从时间和空间入手,逐渐细化和严格起来的,规则的修改促进了篮球技术和战术的不断发展.现代篮球的基本战术是基于对时空的不同侧重而建立起来的时空框架,从时空的视角审视篮球有利于加深对现代篮球战术的理解.  相似文献   

网络环境下图情学与管理学老化规律及其比较研究     

王富国 《情报杂志》2013,(1):63-67,80

选择基于网络的引文数据库CSSCI 2006-2009年间管理学和图书情报与文献学学科领域的33 4689条引文数据,进行两学科的负指数老化模型分析、老化指标分析。研究发现,在网络环境下,这两个学科都符合负指数的老化规律,管理学的学科稳定性要比图书情报与文献学好,而图书情报与文献学的老化速度要比管理学快。本文近似地计算出了目前阶段这两个学科的半衰期分别为4.64年、5.29年;普莱斯指数分别为0.54、0.47;最大引文年限分别为2年、3年。  相似文献   

航海类专业学生补考时间选择对补考通过率影响的相关研究     

廉赢 《科教文汇》2013,(24):89-89,91

通过对某航海院校不同学期相同补考科目学生121人,不同补考时间对补考通过率影响进行分析,得出于开学后三周内完成补考学生的通过率低于假期补考学生。最终确定补考时间的选择可以影响补考通过率,于开学后三周内完成补考学生的通过率较低。建议将补考时间规定为假期结束前l周。  相似文献   

浅议日语中的隐性时间性名词     

吴宦熙 《科教文汇》2013,(10):141-141,143

众所周知,名词具有空间性,动词具有时间性,这种特性在人类的语言里都是共通的。不过,一部分名词也具有时间性。比如,＂明日·6時·今月＂等就具有明显的时间性,这很容易得以判断。与此相对＂,事故·食事·宴会＂等名词又是否具有时间性呢？它在具体运用的时候又具有何种特性呢？本文旨在通过语义及其表达形式对其进行简要分析。  相似文献   

基于ARIMA模型的体育彩票销量预测——以上海为例          下载免费PDF全文

吴殷  李海 《体育科研》2013,(5):23-26

对未来体彩销量预测分析,可以为体彩产品设计、营销推广提供科学依据。本文以上海为例,采用ARIMA模型对2009年1月-2013年3月的上海体育彩票的月度销售数据进行时间序列分析,并预测出2013-2015三年上海体育彩票的销量,从而对上海体育彩票的销量增长趋势进行分析。  相似文献   

中国羽毛球队让球事件的连锁反应——竞技体育参与者利益分化的突显     

丁培莉  王宗平 《辽宁体育科技》2013,35(1):4-5

伦敦奥运会中国、韩国、印尼羽毛球运动员因消极比赛被国际羽联取消本届奥运会参赛资格,韩国对消极比赛的运动员、教练员给予重罚,而国羽＂让球主角＂被奖、庆功宴对＂让球事件＂闭口不提。同样的消极比赛不同的处理方式显示两国历史文化及国情的差异。羽毛球队让球事件的连锁反应是竞技体育参与者利益分化的凸显,因此建立竞技体育利益制衡机制,是实现竞技体育利益平衡的关键。  相似文献   

第19届世界杯足球赛失球数与时段的分析研究     

黄晖 《辽宁体育科技》2013,(6):69-72

运用文献资料法、录像观察法、数理统计法、逻辑分析法,对第19届世界杯决赛阶段32支球队的失球数与时段失球规律和攻防技战术进行分析与研究,以求更好地把握世界足球运动的发展趋势,为今后我国球队的科学训练、足球理论教学和实践的发展提供参考。  相似文献   

System Analysis for Oxygen Uptake Kinetics with Step and Pseudorandom Binary Sequence Exercise in Endurance Athletes     

Takayoshi Yoshida  Yoshiyuki Fukuoka  Richard L. Hughson 《Measurement in physical education and exercise science》2013,17(1):1-9

We examined whether the system analysis for step and pseudorandom binary sequence (PRBS) exercises could be useful to characterize oxygen uptake (VO₂) kinetics of female sedentary subjects and endurance athletes. Breath-by-breath VO₂ was determined during step- and PRBS-cycle ergometer exercises. The time course of the VO₂ kinetics was evaluated by the time constant of the second phase, which should reflect the adjustment of the oxidative metabolism at the skeletal muscle level. The VO₂ kinetics were significantly faster in long-distance runners than in sedentary subjects for both exercises. A significant relationship was observed in the VO₂ kinetics obtained from step and PRBS exercises. In each group, there was no significant difference in the VO₂ kinetics for step and PRBS exercises. These results indicated that the system analysis with PRBS exercises revealed the faster VO₂ kinetics in endurance athletes than in sedentary subjects.  相似文献   

The effect of periodized resistance training on accelerative sprint performance     

Gavin Moir  Ross Sanders  Chris Button  Mark Glaister 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):285-300

The purpose of this study was to assess the effect of periodized resistance training on accelerative sprint performance. Sixteen physically active men participated in a randomized controlled study. An experimental group (n = 10) completed an 8-week periodized resistance training intervention, while a control group (n = 6) did not train. Pre- and post-training measures of 20-m straight-line sprint time, including a 10-m split, maximum strength, and explosive strength, were recorded. Flight time, stance time, stride length, and stride frequency were quantified from digitized video recordings of the first three strides of the 20-m sprint. Resistance training resulted in significant increases in maximum strength (parallel back squat: 19%) and explosive strength (6–10%). However, both groups increased 0–10 m sprint times (experimental group = 6%; control group = 3%) while 10–20 m times were reduced (experimental group = 7%; control group = 4%), highlighting the mechanical differences between the distinct sprint phases. The change during the 0–10 m interval was accompanied by a reduction in stride frequency during the first three strides. Strength coaches should be aware that the potential benefits of increased muscular strength during short sprints are likely to be affected by mechanical specificity and that improvements in sprinting performance may not occur immediately after a period of resistance training.  相似文献