首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 171 毫秒
1.
Abstract

Squad management, injury and physical, tactical and technical match performance were investigated in a professional soccer team across five consecutive league seasons (2008–2013, 190 league games) with specific focus on a championship-winning season (2010/11). For each player, match participation and time-loss injuries were recorded, the latter prospectively diagnosed by the team's physician. Defending and attacking tactical and technical performance indicators investigated included ball possession and possession in opponents' half, passes, forward passes, completed passes and forward passes, crosses and completed crosses, goal attempts and goal attempts on target, successful final third entries, free-kicks and 50/50 duels won/lost. Physical performance measures included total distance and distance covered at high-speeds (≥19.1 km/h). Results showed that during the 2010/11 season, squad utilisation was lowest potentially owing to the observed lower match injury occurrence and working days lost to injury thereby increasing player availability. In 2010/11, the team won both its highest number of points and conceded its lowest number of goals especially over the second half of this season. The team also won its highest number of games directly via a goal from a substitute and scored and conceded a goal first on the highest and lowest number of occasions, respectively. While multivariate analysis of variance (MANOVA) detected a significant difference in some attacking and defensive performance indicators across the five seasons, these were generally not distinguishing factors in 2010/11. Similarly, univariate ANOVAs showed a significant difference in running distances covered across seasons, but the trend was for less activity in 2010/11.  相似文献   

2.
本研究以参加2008年全国青少年网球锦标赛的132名运动员为研究对象，对运动员竞赛心理策略、流畅体验、运动表现关系进行探讨。结果显示：竞赛心理策略多项因子与流畅体验多项因子存在显著正相关；竞赛心理策略中自我谈话、目标设置、表象等五个策略与四个积极运动表现因子呈显著正相关。情绪控制策略与三个不良运动表现因子呈显著负相关。本研究为青少年网球运动员竞赛心理策略的训练工作提供实证依据。  相似文献   

3.
Abstract

The purpose of this study was to examine the relationship between game heart rates by player position during two types of ringette rules: standard rules and experimental rules which did not include zone restrictions (zoneless). Two hundred twenty-five female ringette players (104 standard rules and 121 zoneless rules) were monitored during regular league and tournament play during the 1985 ringette season. This included over 50 games, approximately half played under each set of rules; and included at least five games played in each of five age categories. Field measurement of the game heart rates was conducted by use of an EST Sport-Tester heart rate monitor, which recorded the average of each 30 s heart rate profile. An analysis of variance (ANOVA) with repeated measures was performed to determine the significance of the difference by player position and rules in the mean peak heart rates for six shifts on the ice, the first three and the last three. There were significant differences (p < .05) between mean peak heart rates for forwards and defenders between standard and zoneless rules, but there were no differences between centers. Significance tests were also conducted by position and age division, and the differences in the heart rates of the defenders were significant in the junior belles (13–14) and belles (15–17) age divisions.  相似文献   

4.
Abstract

This exploratory study determined if the responses of male varsity basketball players to six factors influencing cohesion were a function of level of competitive intensity and/or the importance of the players to their team. Players on intact teams from five levels of competition – elementary school, junior high school, senior high school, small college and large college–responded to a cohesion questionnaire at the end of the season. Coaches designated five players with the most game playing time as “starters” and five players with the least game playing time as “reserves.” A team factor score for Team Performance Satisfaction, Self Performance Satisfaction, Task Cohesion, Affiliation Cohesion, Desire for Recognition and Value of Membership was calculated. Each team factor score served as the dependent variable in a 2 (player status) × 5 (level of competition) analysis ofcovariance design, with teams nested in the second factor. The won-loss record served as the covariate. Results indicated that “starters” were more satisfied with their own performance, were more task conscious, had a greater affiliation desire, and valued their membership on the team to a greater degree than the “reserves.” The elementary and junior high school team members were significantly more satisfied with the team's performance, were more satisfied with their own self performance, were more affiliation conscious, and valued their team membership to a greater degree than did college team members. The interaction between player status and level of competition was not significant for any of the factor scores.  相似文献   

5.
Abstract

Release velocity and accuracy are vital components of throwing performance. However, there is no published research on these parameters for throwing in cricket. In this study, we investigated the throwing performance of 110 cricket players from six different populations: elite senior males, elite under-19 junior males, elite under-17 junior males, elite senior females, elite under-19 junior females, and sub-elite senior males. Based on a specifically designed cricket throwing test, participants were assessed for (1) maximal throwing velocity and (2) throwing accuracy at maximal velocity and at three sub-maximal velocities. Elite senior males exhibited the highest peak and mean maximal throwing velocities (P≤0.001). Furthermore, the groups of males had significantly higher peak and mean maximal throwing velocities than the groups of females (P≤0.01). A speed–accuracy trade-off existed such that all groups demonstrated improved accuracy scores at velocities between 75% and 85% maximal throwing velocity compared with 50% maximal throwing velocity and 100% perceived maximal exertion. The results indicate that sex, training experience (years training), and training volume (training time per week) may contribute to throwing performance in cricket players. Further research should focus on understanding the mechanisms behind the observed differences between these groups. This is the first study to describe the inherent throwing profiles of different cricket playing populations. Potentially, we have identified stimulus material for future training developments.  相似文献   

6.
  相似文献   

7.
In this study, the authors examine Major League Baseball free agency to identify whether certain factors beyond a player’s on-field performance contribute to contract premiums. These premiums are considered to be the difference between the compensation a player receives in free agency and the marginal revenue product (MRPt-1) in their contract year. Using 345 free agent transactions over a four-year period (2012–2015), the authors examine the relationships between potential free agent contract premiums and the attributes of a player’s previous team, as well as how contract premiums may be influenced by the level of interest from other teams and certain facets of the acquiring teams. Results suggest that free agents tend to receive compensation premiums when they played for a successful team during their contract year. Playing for a large-market team during their contract year also influenced contract premiums. In addition, free agents tended to realize compensations premiums when multiple teams were bidding for their services, the acquiring teams were in playoff contention the prior year, and the acquiring teams possessed relatively more financial resources. Findings shed additional light on how factors peripheral to a player’s on-field performance may influence the free agency market. Recommendations include that effective control mechanisms are necessary to ensure free agent compensation is commensurate with the value of the player.  相似文献   

8.
青少年足球是提高我国足球竞技水平的基石和保障,但是我国青少年足球人才的培养近年来呈现滑坡和萎缩趋势。以创新运动员等级评价标准和足球技能测试标准作为切入点,面向广大的业余足球运动员研制具有教育性、引导性、发展性和便捷性的青少年足球运动技能等级评价方案,逐步构建具有较强社会影响力的各级各类足球比赛与技能等级测试认证系统,加快改善青少年足球人才培养体系,扩大和提高足球后备人才的规模和质量。进一步对测试标准的创新、研制、管理和推广工作提出了策略和建议。  相似文献   

9.
We identified the perceptual–cognitive skills and player history variables that differentiate players selected or not selected into an elite youth football (i.e. soccer) programme in Australia. A sample of elite youth male football players (n?=?127) completed an adapted participation history questionnaire and video-based assessments of perceptual–cognitive skills. Following data collection, 22 of these players were offered a full-time scholarship for enrolment at an elite player residential programme. Participants selected for the scholarship programme recorded superior performance on the combined perceptual–cognitive skills tests compared to the non-selected group. There were no significant between group differences on the player history variables. Stepwise discriminant function analysis identified four predictor variables that resulted in the best categorization of selected and non-selected players (i.e. recent match-play performance, region, number of other sports participated, combined perceptual–cognitive performance). The effectiveness of the discriminant function is reflected by 93.7% of players being correctly classified, with the four variables accounting for 57.6% of the variance. Our discriminating model for selection may provide a greater understanding of the factors that influence elite youth talent selection and identification.  相似文献   

10.
Abstract

This study examined the influence of emotions on performance in basketball. Six female basketball players were videotaped in six games. Frequency of performance behaviours was recorded minute-by-minute and indices of successful (SGI) and unsuccessful (UGI) game involvement derived for each player. Post-game, players reported the intensity of experienced emotions (anger, anxiety, embarrassment, excitement and happiness), and the time of the eliciting incident. The only emotion revealed as a significant predictor of SGI was happiness; both anger and embarrassment were significant predictors of increased UGI. Consideration of individual player analyses suggests that there is variation in the magnitude of the influence of emotions on performance and the extent to which this influence was helpful or harmful to performance. The study provides evidence that emotions are associated with changes in game behaviours in competition. Implications for further research examining the emotion–performance relationship are discussed.  相似文献   

11.
ABSTRACT

The aim of the current study was to objectively identify position-specific key performance indicators in professional football that predict out-field players league status. The sample consisted of 966 out-field players who completed the full 90 minutes in a match during the 2008/09 or 2009/10 season in the Football League Championship. Players were assigned to one of three categories (0, 1 and 2) based on where they completed most of their match time in the following season, and then split based on five playing positions. 340 performance, biographical and esteem variables were analysed using a Stepwise Artificial Neural Network approach. The models correctly predicted between 72.7% and 100% of test cases (Mean prediction of models = 85.9%), the test error ranged from 1.0% to 9.8% (Mean test error of models = 6.3%). Variables related to passing, shooting, regaining possession and international appearances were key factors in the predictive models. This is highly significant as objective position-specific predictors of players league status have not previously been published. The method could be used to aid the identification and comparison of transfer targets as part of the due diligence process in professional football.  相似文献   

12.
The surface on to which a bowler projects a ball in the game of cricket is made up of hard packed soil with sparse grass cover. This natural turf pitch is of fundamental importance to the play of the game and the quality of the surface is a prime concern of players, officials, commentators and spectators alike. A programme of research has been undertaken to identify the factors that lead to the construction of high quality cricket pitches. This work employed the technology of highspeed video analysis to monitor the performance of first class cricket pitches during county matches. A system for measuring the impact of a cricket ball on a pitch was developed, and over 3000 ball impacts analysed. This analysis enabled pitches to be characterized in terms of pace, bounce and consistency. Soil properties for the monitored pitches were identified and correlations were drawn between pitch performance and soil composition.  相似文献   

13.
This cohort study aimed to provide normative Y Balance Test scores for an elite Rugby Union population, while investigating the effect player age groups (senior/under-20), playing positions (forwards/backs) and anthropometrics (height and body mass) had on performance. Two-hundred and sixty-one elite male under-20 (n = 50) and senior (n = 211) players completed baseline Y Balance Test during the 2015/2016 season. One-way ANCOVA and post-hoc t-tests were used to investigate the effect playing position, player group, height and weight had on performance. The cohort was then stratified into groups (age group and/or playing position), and normative percentiles were presented. There was a statistically significant difference (p < 0.05) in Y Balance Test performance between playing positions, when controlling for age group. This difference did not remain when controlling for player body mass. Post-hoc analysis demonstrated that backs had a longer normalised reach distance, with medium-large and small-medium effect sizes for the under-20 and senior cohorts respectively. The one-way ANCOVA analysis suggests that this difference is likely due to the larger differences in player body mass between forward and back playing positions. The normative values presented in this paper may be used by clinicians and researchers to aid injury prevention and rehabilitation strategies.  相似文献   

14.
Abstract

The study was aimed to explore distinct players’ groups according to their anthropometric and individual features, and to identify the key performance indicators that discriminate player groups. Match statistics, anthropometric and personal features of 1188 male players competing during 2015–2017 main draw Grand Slam singles events were collected. Height, weight, experience, handedness and backhand style were used to automatically classify players into different clusters through unsupervised learning model. Afterwards, 29 match variables were analysed through MANOVA and discriminant analysis in order to evaluate the different match performance among player groups and to identify the key performance indicators that best differentiate player clusters in each Grand Slam. The analysis revealed the existence of four clusters, they were classified as Big-sized Right Two-handed Players (n?=?387), Medium-sized Right One-handed Players (n?=?265), Small-sized Right Two-handed Players (n?=?414), and Left Two-handed Players (n?=?122). Serve, winner, net and physical performance-related indicators (Structure Coefficient?≥?|0.30|) were showed to be the maximum contributors to the group separation. Left-handed players were the most homogenous group in performance. Taller players outperformed their peers in all Slams except for Roland Garros, where left-handed players demonstrated certain advantage playing on slow-pace surface. In Wimbledon and US Open, Medium-sized Right One-handed Players showed better net and physical performance. The advantage of left-handed player is over-represented at elite level. Current findings promote a better understanding of match-play from distinct player groups and offer information on evaluating contextual variability for achieving better performances.  相似文献   

15.
Due to the high incidence of lumbar spine injury in fast bowlers, international cricket organisations advocate limits on workload for bowlers under 19 years of age in training/matches. The purpose of this study was to determine whether significant changes in either fast bowling technique or movement variability could be detected throughout a 10-over bowling spell that exceeded the recommended limit. Twenty-five junior male fast bowlers bowled at competition pace while three-dimensional kinematic and kinetic data were collected for the leading leg, trunk and bowling arm. Separate analyses for the mean and within-participant standard deviation of each variable were performed using repeated measures factorial analyses of variance and computation of effect sizes. No substantial changes were observed in mean values or variability of any kinematic, kinetic or performance variables, which instead revealed a high degree of consistency in kinematic and kinetic patterns. Therefore, the suggestion that exceeding the workload limit per spell causes technique- and loading-related changes associated with lumbar injury risk is not valid and cannot be used to justify the restriction of bowling workload. For injury prevention, the focus instead should be on the long-term effect of repeated spells and on the fast bowling technique itself.  相似文献   

16.
采用文献资料法、调查访问法 ,依据对我国近 10年来少年男子篮球特高运动员成长状况的追踪调查与技术运用现状的分析结果 ,得出结论 :近年来我国少年男子篮球特高运动员成才率较低 ,比赛中出现技术运用单调 ,移动范围小等现象 ,说明我国在少年阶段的男子篮球训练、管理、竞赛、人才培养体制等方面还不完善。针对上述现状 ,本文提出现阶段应全面提高少年篮球特高运动员技术水平、改革少年阶段竞赛体制、拓宽少年阶段人才培养渠道、形成系统人才管理体制的设想  相似文献   

17.
作为体育社会问题之一的非体育道德行为,影响着当代足球运动的健康发展和社会精神文明的建设。以青少年男子足球运动员为研究对象,运用通过信、效度检验的运动员非体育道德行为的调查问卷,对运动员进行问卷调查,以了解不同年龄、不同水平青少年足球运动员的非体育道德行为影响因素的差异,为中国足球运动的健康发展提供一定的依据。  相似文献   

18.
In the present study, we examined the performance environment of the England youth soccer teams. Using a semi-structured protocol with a prospective sample, national coaches (n = 6), sport scientists (n = 3), and players (n = 4) were interviewed directly following international tournaments about the factors that positively and negatively influenced performance. Qualitative content analysis revealed the following factors as major positive influences on performance: adhering to a consistent tournament strategy, player understanding, strong team cohesion, organized entertainment activities, detailed knowledge of opposition, an effective physical rest/recovery strategy, and previous tournament experience. Major factors perceived to have negatively influenced performance included: over-coaching, player boredom, player anxiety, physical superiority of the opposition, physical fatigue over the tournament, problems sleeping, and lack of information on the opposition. Eight overall dimensions emerged to describe the performance environment: planning and organization, physical environment, tactical factors, development and performance philosophy, psychological factors, physical factors, social factors, and coaching. The findings support recent work that suggests the performance environment is multifaceted, with performance being contingent upon a broad range of interacting factors that go beyond the traditional psychosocial and physical domains.  相似文献   

19.
This paper examines the development of association football in the South and West Ulster counties of Fermanagh, Tyrone, Cavan, and Monaghan in the pre-World War One era against the backdrop of the sporting ‘revolution’ and the political and social climate in Ireland at that time. While the Irish Football Association was founded in Belfast in 1880 and the game’s early growth in Ireland was centred in East Ulster, South and West Ulster were areas which were rather dislocated from the hearth of soccer in the province’s largest city, where professional structures were in place by 1894 and where senior and junior association football clubs were strongest. The origins of a number of clubs are examined and it will be shown that despite a lack of major industry and a professional structure, by the early 1900s, the game of soccer had established a strong role within society in many local communities in the area. An examination of the social backgrounds of players and administrators illustrates that leagues and cups were played on a cross-community basis in many areas and that patronage, as well as player participation and administration, came from nationalists as well as unionists.  相似文献   

20.
实证研究了中国足球职业俱乐部教练员的价值,主要围绕教练员更换的主要原因、教练员更换与球队成绩的因果关系和关联程度、教练员更替的个人特征与球队成绩之间关系等问题展开讨论.研究表明,影响中国足球俱乐部更换教练员的主要因素为上期胜率和球队管理风格;教练员更替的路径分析显示,教练员更替、引进球员和前赛季成绩都对本期胜率产生显著影响,其中,"教练员更替"因素对球队当期成绩有负向影响,支持了"管理者更替恶性循环理论";最优更替类型的选择顺序依次为赛季间内部更替、无更替、赛季间外部更替、赛季内内部更替、赛季内外部更替;"教练员能力"因素对球队成绩具有明显的作用,而"年龄"因素作用并不明显.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号