Somersaulting techniques used in high-scoring and low-scoring Roche vaults performed by male Olympic gymnasts     

Yoshiaki Takei  J. Hubert Dunn  Erik P. Blucker 《Journal of sports sciences》2013,31(6):673-685

Abstract

The aim of this study was to compare the somersaulting techniques used in the 16 highest-scoring and 16 lowest-scoring Roche vaults. Our hypothesis was that the gymnasts performing the highest-scoring Roche vaults would demonstrate a better technique than those performing the lowest-scoring Roche vaults while on the horse (pushing off the horse more effectively), somersaulting (executing most of the required somersaults higher in flight), and landing (showing a greater control). A 16-mm motion picture camera, operating at 100 Hz, recorded the vaults during the official competition. The two-dimensional direct linear transformation was used for spatial reconstruction. The results of t-tests (P < 0.05) indicated that, compared with the low-scoring gymnasts, the high-scoring gymnasts had: (1) greater height of body centre of mass and a more fully extended body position at the horse take-off; (2) greater height of body centre of mass at the peak of post-flight, knee release, and touchdown on the mat; (3) greater horizontal and vertical displacements of body centre of mass, greater somersaulting rotation, and longer time from the knee release to mat touchdown; and (d) markedly smaller landing point deductions. In conclusion, a successful Roche vault is likely when the focus is on: (a) leaving the horse with a large vertical velocity in an extended body position to achieve a high trajectory of centre of mass by first extending the legs, then immediately pushing off the horse vigorously, using the muscles of the upper extremity; (b) grasping the knees immediately after the take-off from the horse, achieving the tightly tucked body position early during the ascent to the peak, and completing two-thirds of the required somersaults at a great height; (c) releasing the knees and extending the body above the top level of the horse; and (d) contacting the mat with a high body centre of mass position.  相似文献   

Football’s dark side: corruption,homophobia, violence and racism in the beautiful game     

Carrie Dunn 《Sport in History》2016,36(4):542-544

  相似文献   

Map of a Nation. A Biography of the Ordnance Survey,Rachel Hewitt,Granta, London (2010), ISBN: 978-1-85708-098-1, £25     

Richard Dunn 《Endeavour》2011,35(2-3):41-42

  相似文献   

The pasteurized state: milk, health and the government of risk     

Dunn EC 《Endeavour》2011,35(2-3):107-115

In the late 1940s, Florence Sabin, a retired professor of medicine, returned to her home in Colorado to launch a massive public health campaign. Seeing "filthy milk" as an important vector of disease, she struggled not just pasteurized milk, but a pasteurized state government that was capable of regulating the milk industry. In the process, she brought managerialism into public health by fighting against the political machines and introducing Robert McNamara's systems analysis into government for the first time. Sabin's innovation, which united business, government and public health in new ways, transformed the way that public health is managed even today.  相似文献   

Books Dealing with News     

Delmor D. Dunn  William O. Chittick  Richard W. Lee  Curtis D. MacDougal  Ruth Adler 《Communication Booknotes Quarterly》2013,44(1):3-4

Delmor D. Dunn's Public Officials and the Press (Addison-Wesloy paporback, price unknown)

William O. Chittick's State Department, The Press, and Pressure Groups (Wiley-Interscience, $9.95)

Richard W. Lee, Politics and the Press (Acropolis Books (Washington D.C.), $3.95 in paperback, with a hardcover edition available, price unknown)

Curtis D. MacDougal's edited collection, Reporters Report Reporters (Iowa State, $6.50)

Ruth Adler, The Working Press (Bantam, $1.25)  相似文献   

From skills lab to learning resource center: transformation through collaboration     

S C Dunn  A K Fried  D Haag  H S Hurley 《Bulletin of the Medical Library Association》1985,73(2):210-212

  相似文献   

Indexing concepts and methods: Harold Borko and Charles L. Bernier. Academic Press,New York, 1978, 261 pp. $14.00. ISBN 0-12-118660-1.     

Doris Dunn 《Information processing & management》1979,15(6):325-326

  相似文献   

The aims of science courses     

N. R. Thorley  D. J. Boud  J. C. Dunn  T. Kennedy 《Research in Science Education》1979,9(1):53-54

  相似文献   

If we can't contextualize it,should we teach it?     

Thomas G. Dunn 《Educational technology research and development : ETR & D》1994,42(3):83-92

Constructivists often present their ideas as the solution to most ills in education. Sometimes explicitly, but often implicitly, instructional systems design (ISD) is blamed for these ills. There is some irony to this as ISD advocates often lament the dearth of ISD in education. Be that as it may, ISD does have limitations and there is much to be learned from constructivism. However, is a paradigm switch the answer? This paper will take a different approach as it will indicate how ISD can help those who want to develop constructivist instruction. The ISD procedures involved in task/learning analyses and formative evaluation are presented as particularly beneficial.  相似文献   

A guide to the Floridi keys     

J. Michael Dunn 《Metascience》2013,22(1):93-98

  相似文献