Coordination variability and skill development in expert triple jumpers

The aim of this study was to examine the influence of skill of expert triple jumpers on the coordination variability of lower extremity intra-limb couplings. In contrast to the traditional motor learning perspective, we hypothesized that as skill and thus performance increases, movement coordination variability will also increase. Three-dimensional kinematic and ground reaction force data were collected during the hop-step transition phase of the triple jump. Relative motion plots and a modified vector coding technique were used to quantify the coordination variability across the trials. The results were consistent with a U-shaped curve, representing coordination variability, as skill increases. The high coordination variability in less skilled athletes is present while the appropriate characteristics defining the movement coordination patterns are acquired. This coordination variability may not be beneficial to performance. As the refinement of these characteristics is achieved, coordination variability decreases, resulting in a more consistent or regulated performance. In the final stages of developing a skilled performance, a functional variability is accessed that brings flexibility to the system allowing it to cope with perturbations. This study highlights the need to address the learning effect when analysing coordination variability from a dynamical systems perspective.     

讀了職業教育專號以後

我是喜欢研究职业教育的人,却並不是職業教育的专家,我向來對於职业教育也很懷疑,對於職業学校尤其怀疑。不過我所懷疑的,是職業教育和職業學校在中國何以不能显出效能,不是懷疑職業教育和职業學校的本身,職業教育在教育史上的年代,原來很短,就是最發達的德国,美國,提倡的時期,距今也還不遠,他們也有許多問題,不能得到圓满的解決,正怪不得我們中國還在‘議論紛紜,莫衷一是’     

吹起口哨——迪斯尼动画片《木偶奇遇记》插曲

当你有时身陷困境,是非分不{矿甲广.万.1卜.、___.一、二-.、、.,二l}j布衬『1.户口洲尸洲!一口口寻口尸.‘户)1旦,1于葫内7沁尸吞「「】!一厂户户.11尸派」」」」ll林飞尹’尸l叹…!.一1.’.一卫l厄二一口.一t夕.认i、」」」」ll二、」目l,_.l、l…ll五甘『i曰夕--一口!一口.‘日口--一【曰一函厄二ll宁葫,71尸丘莽马一!一声户-.一门叫一卜(.1」1l飞叭7『闷叹.尸,一衍「叹‘「{二l可州口--可厂。卜 1}日卜厂 }_:队,‘异一,以.‘、.}_.、气.卫!{洲公帐叼画卜罗闷、i1.习二i口.留枷泥ll‘气,时‘尸一i认尸户ll声一衬找不吞’气11{i压万.一l几…     

史提芬·斯皮尔伯格

Just when you thought it was safe forSteven Spielberg to ease off,the most popular moviemaker of all time is going in new direc-tions at a storming pace.     

遗迹保卫，余你其谁 DotA新手入门系列之二

这一期主要介绍关于经验、操作和时机选择方面的东西,然后再向大家介绍几个英雄的打法。压制篇很多新手打DotA感觉很盲目,尤其是在初期。归根结底是他们不知道自己的目标是什么；First blood?神装?都错了,不要太执着的得到第一滴血,也不要给自己定太高的目标要补到多少钱,在DotA初期来讲,最重要的是经验!让自己得到足够多的经验,然后尽可能让敌人少得到经验,即压制对方。在游戏中期的群体PK中,等级高一两级会有比较明显的效果。因此经验才应该是Dot A玩家初期应该真正去锁定的目标。出来的装备选择,通常情况下可以选一个回复戒指,一个血瓶(具体情况有差异,也有许多其他选择)。为什么这样选呢,因为你要得到更多的经验就要持久,回复戒指是优先选择的装备。如果你是solo,在没有盟友帮助的情况下,回复戒指可以给你更持久的帮助,一个血瓶虽然有400的血,但是很容易被打掉。solo的话,一定要保证自身的安全,你没死,而对方solo的死了,这就是优势。但是保证安全并不是要保持自己的血是满血,60%——75%的血量是最好的了。为什么这样说呢?这种情况下你的选择会多种多样,可以选择补刀,也可以选择进攻对手或者是退后防御,多样化的选择反而让对手摸不清你真实的想法,不敢贸然上前或者选择离开,处于进退两难的境地,这对你是非常有利的。这个时候你可以经常假装上前,通常会吸引敌方释放魔法,消耗他的MP,等到他的MP不多了之     

碟中谍3

经过延期、换角等一系列不利事件后,汤姆·克鲁斯的《碟中谋3》终于要上映了。由于剧情保密功夫做得实在太好,小编也只能挖到零星消息(唉)。不过众多预测都似乎在暗示阿汤哥这次的情况不容乐观,希望是好事多磨吧。