Kicking Performance in Young U9 to U20 Soccer Players: Assessment of Velocity and Accuracy Simultaneously     

Luiz H. P. Vieira  Sérgio A. Cunha  Renato Moraes  Fabio A. Barbieri  Rodrigo Aquino  Lucas de P. Oliveira 《Research quarterly for exercise and sport》2018,89(2):210-220

Purpose: The purpose of this study was to compare the kicking performance of young soccer players in the U9 to U20 age groups. Method: Three hundred and sixty-six Brazilian players were evaluated on an official pitch using three-dimensional kinematics to measure (300 Hz) ball velocity (V_ball), foot velocity (V_foot), V_ball/V_foot ratio, last stride length, and distance between the support foot and the ball. Simultaneously, a two-dimensional procedure was also conducted to compute (60 Hz) the mean radial error, bivariate variable error, and accuracy. Possible age-related differences were assessed through one-way analysis of variance and magnitude-based inferences. Results: Ball velocity increased by 103% (p < .001, η² = .39) from the U11 age group (48.54 ± 8.31 km/hr) to the U20 age group (98.74 ± 16.35 km/hr). Foot velocity presented a 59% increase (p < .001, η² = .32) from the U11 age group (49.08 ± 5.16 km/hr) to U20 (78.24 ± 9.49 km/hr). This finding was due to improvement in the quality of foot–ball impact (V_ball/V_foot ratio) from U11 (0.99 ± 0.13 a.u.) to U20 (1.26 ± 0.11 a.u.; p < .001, η² = .25). Parameters such as mean radial error and accuracy appeared to be impaired during the growth spurt (U13–U15). Last stride length was correlated, low to moderately high, with V_ball in all age groups (r = .36–.79). Conclusions: In summary, we concluded that simple biomechanical parameters of kicking performance presented distinct development. These results suggest that different training strategies specific for each age group could be applied. We provide predictive equations to aid coaches in the long-term monitoring process to develop the kick in soccer or search for talented young players.  相似文献   

Education and Multimedia: the actions of the European Union     

André Richier  Alain Dumort  Corinne Hermant  Marielle Riché‐Magnier 《欧洲师范教育杂志》1997,20(1):33-37

This paper sets out the findings and recommendations of a task force which was set up by the European Commission which investigated the “Educational Multimedia”. It illustrates some of the strategic planning which has taken place across EU member states to co‐ordinate work on new education technologies to enhance teaching and learning.  相似文献   

The Future is Flexible,Extensible, and Community-Based: Stories of Successful Electronic Resources Management     

Andrea Imre  Steve Oberg  Scott Vieira  Lori Duggan 《期刊图书馆员》2016,70(1-4):204-210

Centralized Online Resources Acquisitions and Licensing (CORAL) is an open source electronic resources management system originally developed by the University of Notre Dame Hesburgh Libraries. The CORAL system consists of five modules designed to manage the library electronic resources life-cycle, including licensing and contact information, procurement and activation workflow, usage statistics, and the storage of documentation. CORAL was designed as a flexible and customizable management system, with the ability to utilize each module independently or as a suite to maintain the electronic resources management needs of individual institutions. Scott Vieira of Rice University, Steve Oberg of Wheaton College, and Andrea Imre of Southern Illinois University Carbondale present on the functionality of CORAL and demonstrate the system’s flexibility and extensibility in managing library electronic resources.  相似文献   

Higher Education and Emerging Technologies: Shifting Trends in Student Usage     

Erin Dorris Cassidy  Angela Colmenares  Glenda Jones  Tyler Manolovitz  Lisa Shen  Scott Vieira 《The Journal of Academic Librarianship》2014

This study serves as an update to a previous study by Sam Houston State University librarians about the use and preferences of Internet, communication, and educational technologies among students. Since the previous study was initiated in 2010, the iPad has made its debut and significantly altered the educational technology landscape. In this new landscape, this study investigates student usage of such technologies as instant messaging, cell phones, e-readers, social networking, RSS feeds, podcasts, and tablets. In addition, this study aims to determine which technologies students prefer the library to utilize for a variety of services, such as reference assistance or book renewals, and which technologies may not be worth the investment, such as geosocial networking. The information gained from this survey is intended to provide guidance for libraries looking to provide services utilizing the most popular technologies with the most efficient use of resources. Survey results show an increasing use and dependence on educational technologies and a desire for basic library services to be available on a variety of platforms and technologies.  相似文献