长期高策略性技能训练对运动员大脑白质结构的影响：一项DTI研究

目前关于运动员经验优势的脑机制还存在争议, 尤其对于涉及较多认知过程参与的高策略性技能项目运动员, 其大脑白质结构可塑性变化还需进一步探究。研究横向对比了乒乓球运动员和非运动员大脑白质纤维束的弥散张量成像数据。结果发现, 相比于非运动员, 乒乓球运动员在连接背侧和腹侧通路脑区的双侧皮质脊髓束、左侧上纵束、左侧下纵束和双侧额枕下束的各向异性值(FA)更大, 进一步分析发现, 部分腹侧通路白质纤维束FA增加的原因是径向扩散系数(RD)下降。研究结果支持了动作双通路模型。提示经过长期高策略性技能训练, 乒乓球运动员在背侧和腹侧通路上的白质纤维束结构完整性增强。     

对运动成就目标三维模型的检验 ──一项对高水平乒乓球运动员的实证研究

Harwood等人（2000）对已应用于体育运动领域的任务-自我目标定向理论及其相关的测量工具提出了批判与质疑,并在此基础之上提出了运动成就目标三维模型,该模型将体育运动领域的成就目标分为三种,分别是纯任务目标;自我关联的自我目标;以及他人关联的自我目标。本研究的目的是对Harwood等人提出的运动成就目标三维模型进行检验。全文由两个子研究组成。研究一是成就目标问卷的发展与检验,对问卷的发展与信度、效度的检验进行了详细的介绍。研究二中,研究者采用所发展的成就目标问卷与录像访谈相结合的方法对4位（2男,2女）高水平乒乓球运动员的特质性目标以及赛前,赛中,赛后的状态性目标进行测评与检验。验证性因素分析的结果表明该运动成就目标问卷的三维模型拟合较好,三因素结构较为清晰。重测信度检验结果表明该问卷的三个维度均具有较高的重测信度。教练员对4名运动员成就目标的评估结果与运动员的问卷所得结果的一致性进一步支持了运动成就目标问卷的内部效度。对4名运动员的研究结果表明：（1）特质性目标对赛前状态性目标的预测主要与个人特点有关;（2）运动员在赛前与赛中状态性目标呈多元化趋势,既有只突出某一目标的单维现象,又有两种或三种目标同时占主导的多维现象;（3）运动员赛后状态性目标的变化倾向于受到比赛过程与结果的影响;（4）当运动员在比赛中经历重大挫折的时候,会有“亚目标”状态出现。本研究结果对Harwood等人的运动成就目标三维模型提供了支持。通过本研究,人们对高水平运动员的特质性目标及赛前、赛中、赛后状态性目标的性质及其变化有了更加深入的了解     

帛书《周易》以史解经刍议

1973年长沙马王堆出土的帛书《周易》中的《缪和》篇中,有六则以历史故事解说《易经》卦爻辞的例子。本文分析这六则历史故事用以解经的符合程度,以证明用历史故事解经并不始于南宋的杨万里等人,而四库馆臣所谓"一变而胡瑗、程子,始阐明儒理;再变而李光、杨万里,又参证史事,《易》遂日启其论端",并非历史事实。     

网球运动专长对深度运动知觉影响的ERP研究

结合专家-新手范式与ERP技术,研究网球运动专长对个体深度运动知觉产生的影响。通过记录网球专家和新手各19名进行深度运动模式判断时的行为和ERP数据,比较两组个体深度运动知觉的行为反应差异和脑电特征。结果显示,网球专家组深度运动知觉的判断准确率高于新手组;新手组在球体靠近时P1(PO7点)的潜伏期比球体远离时的潜伏期长,专家组无显著性差异;专家组在球体靠近时的P2(Oz点)成分潜伏期长于球体远离时的潜伏期。结果表明,网球运动专家的深度运动知觉能力在准确性上较新手高;运动专长效应与选择性注意资源的调用以及模式识别有关;枕区P2成分可作为深度运动知觉的评价指标。     

乒乓球运动员人格特征对比赛成绩及专业发展的影响

根据先前研究确定的乒乓球运动员人格特征,对少体队、省队、国家队三个层次的乒乓球运动员群体进行纵向追踪研究。研究结果发现,乒乓球运动员人格特征与其比赛成绩存在较高相关,能够较好的预测高水平运动的比赛成绩;升级组运动员在乐观性、宽容性、探究性、有恒性、自律性、果断性、稳定性等7项特质上优于未升级组运动员,乒乓球运动员人格特征可较准确地预测球员在专业水平上的成功表现。研究的结果支持了先前横向比较研究的结论:乒乓球运动员的人格特征主要由表现性、乐观性、变通性、宽容性、合作性、稳定性、探究性、紧张性、有恒性、自律性、独立性、果断性和工作专注13项心理特质组成。     

Performance and decision making of a complex skill under monitoring and outcome pressure conditions: Which of them can reinvestment predict?

Despite a huge amount of research conducted on performance under competitive pressure, the different components of a competitive environment such as outcome pressure or monitoring pressure, have less been investigated. The present study aimed to investigate the performance and decision making of a complex skill and their link with reinvestment (a type of self-focus behavior) under different conditions of pressure using a table tennis task. The topspin forehand and backhand shots of 20 expert table tennis athletes were examined under low, monitoring, and outcome pressure conditions in a within-group design. In addition, predictive validities of Decision-Specific Reinvestment Scale (DSRS) and Movement-Specific Reinvestment Scale (MSRS) with the changes of performance and decision making from low- to high-pressure conditions as dependent variables were examined. The repeated measures ANOVA results showed that the effects of pressure conditions on anxiety were significant. Decision accuracy under outcome pressure and decision speed under monitoring and outcome pressure conditions were decreased. The performance of athletes was decreased under monitoring pressure while no changes was observed in their performance under outcome pressure. Decision Reinvestment (a factor of DSRS) could predict decision speed changes under both pressure conditions, while Movement Self-Consciousness (a factor of MSRS) could predict performance changes only under monitoring pressure. Our Findings highlight that the subscales of MSRS and DSRS were activated independently and a competitive pressure situation has different effects on the cognitive and motor aspects of complex skills. It is suggested that expert athletes and coaches consider separate pressure conditions and their relationships with the ongoing task.     

Robustness to temporal constraint explains expertise in ball-over-net sports

The present study investigated motor expertise in interpersonal competitive ball-over-net sports in terms of a dynamical system with temporal input. In a theoretical framework, the behavior of the system is characterized by a fractal-like structure according to switching input, which changes uniquely according to the duration of input and internal parameter of the system. We investigated periodic movements, in which the player executed a forehand or backhand stroke repeatedly, and continuous switching movements, in which the player continuously switched between two movement patterns corresponding to hitting the ball under two ball directions and with six temporal constraint conditions during a table tennis rally. In the periodic movement, we observed two limit-cycle attractors corresponding to each direction in the phase space independent of temporal constraint or skill level. Conversely, in the continuous switching movement, a transition in trajectories between the two limit-cycle attractors was observed in the phase space, and this transition was characterized by a fractal-like structure. The fractal-like structure moved closer to the random structure as temporal constraint increased independent of skill level. However, the temporal constraint condition closest to the random structure was higher for the advanced players than for the novices, indicating that robustness to the temporal constraint was higher for the advanced players than for the novices. Our results suggest that motor expertise in interpersonal competitive ball-over-net sports is more robust to temporal constraints with various inputs.     

Uncontrolled manifold analysis of joint angle variability during table tennis forehand

This study was conducted with the objective of evaluating the variance structure of the trunk and racket arm joint angles in table tennis topspin forehand using the uncontrolled manifold (UCM) approach, regarding racket orientation as the task variable. Nine advanced and eight intermediate male collegiate table tennis players performed the topspin strokes against backspin balls. The trunk, upper limb, and racket were modeled as six rigid-link segments with a total of 16 rotation degrees of freedom. The UCM analysis was conducted using 30 trial datasets per participant to quantify the degree of redundancy exploitation needed to stabilize the vertical and horizontal angles of the racket. Irrespective of the performance level, the variance of the joint angle vector increased towards ball impact. The degree of redundancy exploitation increased towards ball impact. As a result, the variability of the racket angles was minimal at impact. Both groups of players used the relative movement between the racket and the hand to stabilize the racket angles at ball impact. The variance of the joint angle vector that affected the vertical racket face angle at ball impact was significantly smaller for advanced players than for intermediate players, and the degree of redundancy exploitation to stabilize that angle at impact tended to be larger for the advanced players. The ability to use the redundancy of the joint configuration to stabilize the vertical racket face angle at impact may be a critical factor that affects performance level.     

Gender differences in reaction to psychological pressure: evidence from tennis players

Using data on about 35,000 professional tennis matches, we test whether men and women react differently to psychological pressure arising from the outcomes of sequential stages in a competition. We show that, with respect to men, women losing the first set are much more likely to play poorly the second set. This suggests that women are more discouraged when facing the pressure of falling behind and receiving negative feedback. The gender differential is stronger in high-stake matches. On the other hand, when players are tied in the third set we do not find any gender difference in players’ reactions suggesting that women are as able as men to handle pressure if they do not lag behind. These results are robust controlling for measures of abilities and fitness of players, such as players’ rankings, players’ ex-ante winning probability, players’ rest, monetary prizes, players’ and tournaments’ fixed effects.