Development of dribbling in talented youth soccer players aged 12–19 years: A longitudinal study     

Barbara C. H. Huijgen  Marije T. Elferink-Gemser  Wendy Post  Chris Visscher 《Journal of sports sciences》2013,31(7):689-698

Abstract

The aims of the current study were to assess the development and determine the underlying mechanisms of sprinting and dribbling needed to compete at the highest level in youth soccer. Talented soccer players aged 12–19 years (n = 267) were measured on a yearly basis in a longitudinal study over 7 years, resulting in 519 measurements. Two field tests, the Shuttle Sprint and Dribble Test and the Slalom Sprint and Dribble Test, were assessed. Anthropometric characteristics, years of soccer experience, and duration of practice were recorded. The longitudinal data were analysed with multi-level modelling. Comparing the two tests at baseline, low correlations were observed (sprinting: r = 0.49; dribbling: r = 0.22), indicating that each test measures distinct qualities (acceleration vs. agility). Low-to-moderate correlations were found between dribbling and sprinting within each test (Shuttle Sprint and Dribble Test: r = 0.54; Slalom Sprint and Dribble Test: r = 0.38). Both dribbling and sprinting improved with age, especially from ages 12 to 14, but the tempo of development was different. From ages 14 to 16, sprinting improved rapidly in contrast to dribbling; this was especially evident on the Slalom Sprint and Dribble Test. In contrast, after age 16 dribbling improved considerably but sprinting hardly improved. Besides age, the factors that contribute to dribbling performance are lean body mass, hours of practice, and playing position.  相似文献   

Personal and situational factors influencing coaches’ perceptions ofstress     

Camilla J. Knight  Ian L. Reade  Anne-Marie Selzler  Wendy M. Rodgers 《Journal of sports sciences》2013,31(10):1054-1063

Abstract

Coaching has been recognised as a demanding occupation, associated with a range of stressors. The extent to which coaches perceive stress is likely to be influenced by various personal and situational factors. The purpose of this study was to identify coaches' levels of perceived stress and examine the personal and situational factors that may influence coaches' perceptions of stress. In total, 502 coaches working with university, college, Canada Games, and/or nationally identified athletes completed this study. Coaches completed an online survey, which included questions regarding demographics, work/job-related considerations, and aspects relating to their contract. Coaches also completed the Perceived Stress Scale (Cohen, Kamarck, & Mermelstein, 1983 Cohen, S., Kamarck, T. and Mermelstein, R. 1983. A global measure of perceived stress. Journal of Health and Social Behavior, 24: 385–396. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]). Overall coaches indicated slightly below average levels of perceived stress (M = 15.13 out of 40) compared with norm-values (Cohen & Janicki-Deverts, 2012 Cohen, S. and Janicki-Deverts, D. 2012. Who's stressed? Distributions of psychological stress in the United States in probability samples from 1983, 2006, and 2009. Journal of Applied Social Psychology, 42: 1320–1334. [Crossref], [Web of Science ®] , [Google Scholar]). Demographic factors, job-related characteristics, and certain aspects of their contract were associated with coaches' perceptions of stress. In particular, unclear expectations, long-working hours (>40), lack of agreed evaluation criteria, higher salaries, and a lack of social support were related to higher perceptions of stress. As such, the findings of the current study indicate that a reduction in perceived stress is likely to be achieved through a multifaceted approach that addresses multiple factors associated with coaching.  相似文献   

Cross-Validation of the Revised Motivation for Physical Activity Measure in Active Women     

Philip M. Wilson  Wendy M. Rodgers  Shawn N. Fraser 《Research quarterly for exercise and sport》2013,84(4):471-477

Abstract

The five different training methods used in this study consisted of various proportions of swimming and of weight training exercises. Sixty subjects were divided into five equated groups. Each group was exposed to a different treatment over a period of six weeks. Tests of swimming speed were administered at the beginning of the experiment, and at the end of each week. All five treatments resulted in significant swimming improvements, but none of the treatments were significantly more effective than the other treatments.  相似文献   

Learning from Action Research About Science Teacher Preparation     

Carole P. Mitchener  Wendy M. Jackson 《Journal of Science Teacher Education》2012,23(1):45-64

In this article, we present a case study of a beginning science teacher’s year-long action research project, during which she developed a meaningful grasp of learning from practice. Wendy was a participant in the middle grade science program designed for career changers from science professions who had moved to teaching middle grade science. An extended action research experience in the second year of induction proved valuable to her in learning how to modify her teaching to reach her goal, using evidence of student learning as her guide. This article closes with reflections on the value of extended action research within science teacher preparation, particularly early in one’s career, and explores the promise for ongoing practice-based professional development throughout a teacher’s career.  相似文献   

Genre studies and archives: introduction to the special issue     

Gillian Oliver  Wendy M. Duff 《Archival Science》2012,12(4):373-376

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Contradictory messages and complex change: An application of constructivist and paradox theories to supervisory change     

Wendy L. Poole 《Journal of Personnel Evaluation in Education》1996,10(3):247-269

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Paired Storying How the idea developed     

Wendy Dedicott 《Literacy》1986,20(3):168-172

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“扩散代理”——图书馆未来的发展趋势   总被引：1，自引：0，他引：1  

乔欢 《国家图书馆学刊》2005,14(3):85-87

进入20世纪90年代后，图书馆发展分为三个阶段：90年代中期以前，以分布式计算和网络技术为特征，每个人、每个机构都可以“出版”(publication)和“创造”(creation)图书馆，信息产品和信息服务呈爆炸式增长。“内容标准”(content standard)和“智力系统”(intellectual system)使人们可以参照共同标准创造图书馆。  相似文献   

The effects of portfolio-based advice on the development of self-directed learning skills in secondary vocational education     

Wendy Kicken  Saskia Brand-Gruwel  Jeroen J. G. van Merri?nboer  Wim Slot 《Educational technology research and development : ETR & D》2009,57(4):439-460

This experimental study was designed to investigate whether supervision meetings, in which students receive specific advice on how to use a development portfolio to monitor their progress and plan their future learning, helps them to develop self-directed learning skills and improve their learning in the domain. In the first year of a hairdressing program in vocational education, supervision meetings were used to provide students with either specific advice or not. Students in the advice group (n = 21) formulated better learning needs, selected more suitable learning tasks, completed more practical assignments, and acquired more certificates than students in the feedback-only group (n = 22). Interviews also showed that students in the advice group appreciated the supervision meeting more and perceived them as more effective than students in the feedback-only group. Guidelines are provided for the use of development portfolios and the organization of supervision meetings in on-demand vocational education.

Wendy KickenEmail:

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Welcoming Transparency          下载免费PDF全文

Wendy C. Budin 《The Journal of perinatal education》2009,18(2):1-3

In this column, the editor of The Journal of Perinatal Education (JPE) discusses why there is a need for transparency to improve maternity care. The editor also describes the contents of this JPE issue, which offer a broad range of resources, research, and inspiration for childbirth educators in their efforts to promote normal birth.  相似文献