Relationships between functional movement screen scores,maturation and physical performance in young soccer players     

Rhodri S. Lloyd  Jon L. Oliver  John M. Radnor  Benjamin C. Rhodes  Avery D. Faigenbaum  Gregory D. Myer 《Journal of sports sciences》2015,33(1):11-19

The purpose of this study was to examine relationships between functional movement screen scores, maturation and physical performance in young soccer players. Thirty males (11–16 years) were assessed for maturation, functional movement screen scores and a range of physical performance tests (squat jump, reactive strength index protocol and reactive agility cut). Older players significantly outperformed younger participants in all tests (P < 0.05; effect sizes = 1.25–3.40). Deep overhead squat, in-line lunge, active straight leg raise and rotary stability test were significantly correlated to all performance tests. In-line lunge performance explained the greatest variance in reactive strength index (adjusted R² = 47%) and reactive agility cut (adjusted R² = 38%) performance, whilst maturation was the strongest predictor of squat jump performance (adjusted R² = 46%). This study demonstrated that variation of physical performance in youth soccer players could be explained by a combination of both functional movement screen scores and maturation.  相似文献   

Research into teachers’ knowledge and the development of mathematics classroom practices     

Gwendolyn M. Lloyd 《Journal of Mathematics Teacher Education》2014,17(5):393-395

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Two Teachers' Conceptions of a Reform-Oriented Curriculum: Implications for Mathematics Teacher Development   总被引：1，自引：0，他引：1  

Gwendolyn M. Lloyd 《Journal of Mathematics Teacher Education》1999,2(3):227-252

This paper describes two high school teachers' conceptions of the cooperation and exploration components of a reform-oriented mathematics curriculum. Although the teachers appreciated the themes of cooperation and exploration in theory, their conceptions of these themes with respect to their implementations of the curriculum differed. One teacher viewed the curriculum's problems as open-ended and challenging for students, whereas the other teacher claimed that the problems were overly structured. Each teacher attributed difficulties with students' cooperative work to the amount of structure and direction (too little or too much) offered by the problems. Discussion of such similarities and differences in the teachers' conceptions emphasizes the dynamic, humanistic nature of curriculum implementation and gives rise to important implications for mathematics teacher development in the context of reform. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

A determination of the dynamic response of softballs   总被引：3，自引：3，他引：0  

Lloyd V. Smith  Alan M. Nathan  Joseph G. Duris 《Sports Engineering》2010,12(4):163-169

An apparatus is described for measuring the stiffness and coefficient of restitution (COR) of balls with application to softballs. While standardized test methods currently exist to measure these properties, they do not represent the displacement rate and magnitude that occur in play. The apparatus described herein involves impacting a fixed, solid cylindrical surface (matched to the diameter of the bat) with a ball and measuring the impact force during impact and speed of the ball before and after impact. The ratio of the ball speeds determines the COR, while the impact force is used to derive a ball stiffness. For an example of the contribution of the new ball test, the performance of hollow bats, which is sensitive to ball stiffness, was compared. Bat performance showed a much stronger dependence on the proposed ball stiffness than the traditional measure. Finally, it was shown that to achieve similar conditions between impacts with fixed and recoiling objects, the impact speed should be chosen so that the centre of mass energy was the same in the two cases. The method has application to associations wishing an improved method to regulate ball and bat performance.  相似文献   

Electricity in refrigeration     

R.Louis Lloyd 《Journal of The Franklin Institute》1908

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Revel,Riot and Rebellion     

Lloyd Bowen 《Cultural and Social History》2013,10(3):309-314

This article considers the ways in which the question of scale: parish, county, regional and national, operated in David Underdown’s Revel, Riot and Rebellion. It is suggested that Underdown mixed the parish-based approaches of Keith Wrightson and the regional model of the Annales school with his own interest in national politics. These methodological influences helped underwrite and structure the book’s narrative in which older models of local communal identity were fragmented both by the long process of social, economic and cultural change from the sixteenth century onward, but also by the national political developments of the 1640s and 1650s.  相似文献   

Radioactive properties of rocks,soils, crude oil and waters from Southern California     

J.Lloyd Bohn 《Journal of The Franklin Institute》1930,210(4):461-472

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Feedback: The precise determination of sample size in evaluation studies     

Alan Michalczyk  Lloyd Lewis 《Performance Improvement》1981,20(5):39-40

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Implementation. The glue of organizational change     

Roger M. Addison  Clayton R. Lloyd 《Performance Improvement》1999,38(6):8-11

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Research priority setting with parents of students with learning exceptionalities and disabilities     

Jennifer Baumbusch  Jennifer E. V. Lloyd 《British Journal of Special Education》2022,49(2):209-229

With an increasing focus on knowledge mobilisation, there is a concomitant shift in how stakeholders, such as parents, ought to be engaged in the research process. The purpose of this study was to explore the research priorities of parents of Kindergarten to Grade 12 students with learning exceptionalities and disabilities in British Columbia, Canada. A cross-sectional survey design was employed. A convenience sample of 130 parents completed the survey. From a list of pre-selected variables, parents identified time to initial designation, high school graduation, and home-schooling/independent schooling as the three most important research priorities, with learning disabilities, autism spectrum disorder, and moderate behaviour support/mental illness as the three most important designations. In an open-ended response, parents recommended further areas for inquiry, including the effectiveness of inclusive education and school exclusion. Research priority setting can help create research agendas that align with the needs and interests of stakeholders.  相似文献