Reliability and validity of the Yo-Yo intermittent recovery test level 1 in young soccer players     

Dieter Deprez  Aaron James Coutts  Matthieu Lenoir  Job Fransen  Johan Pion  Renaat Philippaerts 《Journal of sports sciences》2013,31(10):903-910

Abstract

The present study investigated the test-retest reliability from the Yo-Yo IR1 (distance and heart rate responses), and the ability of the Yo-Yo IR1 to differentiate between elite and non-elite youth soccer players. A total of 228 youth soccer players (11–17 years) participated: 78 non-elite players to examine the test-retest reliability within 1 week, added with 150 elite players to investigate the construct validity. The main finding was that the distance covered was adequately reproducible in the youngest age groups (U13 and U15) and highly reproducible in the oldest age group (U17). Also, the physiological responses were highly reproducible in all age groups. Moreover, the Yo-Yo IR1 test had a high-discriminative ability to distinguish between elite and non-elite young soccer players. Furthermore, age-related standards for the Yo-Yo IR1 established for elite and non-elite groups in this study may be used for comparison of other young soccer players.  相似文献   

Book review     

Kai Borrmann  Richard Collins  Hans‐Dieter Zimmermann 《媒体管理杂志》2013,15(4):287-291

Stay tuned. A history of American broadcasting, Third Edition written by Christopher H. Sterling and John Michael Kittross. Lawrence Erlbaum Associates, Mahwah, New Jersey, London, 2002, 975 pages, ISBN 0–8058–2624–6, www.erlbaum.com

Media Ownership, written by Gillian Doyle. Sage, London, 2002, ISBN 007619–6680–3/007619–6681–1 (pbk)

Internet management issues: A global perspective, edited by John D. Haynes. Idea Publishing Group, 2002, 340 pages, ISBN 1–930708–21–1, www.idea-group.com  相似文献   

The Influence of a Shortened Magazine Supply Duration on Newsstand Magazine Sales     

Dieter K. Tscheulin  Martin Dietrich  Jorg Lindenmeier  Thomas Hafele 《Journal of Media Economics》2013,26(4):239-258

This article examines how shortened magazine supply duration of magazines effects newsstand sales. Based on a quasi-experimental design, panel data are gathered from a total of 33 newsstand vendors in cooperation with a magazine wholesaler in southwestern Germany. As results show, a shortening in magazines' supply duration does not lead to a significant decrease in a newsstand vendor's or a wholesaler's overall revenues. Furthermore, diverse categories of magazines are affected differently by a shortening of supply durations.  相似文献   

Scientometrics reveals funding priorities in medical research policy     

Dieter Vanderelst  Niko Speybroeck 《Journal of Informetrics》2013,7(1):240-247

Several studies have assessed whether funding of disease specific research is in line with their burden. The authors of these studies concluded that the burden of a disease was a good predictor for its associated research funding. However, previous analyses did not take into account diseases that mainly affect people living in low income regions, i.e. so-called diseases of poverty. Moreover, the analyses were only performed for the burden diseases cause in high income countries. We investigated whether the conclusions about the relationship between burden and funding still holds when (1) including diseases of poverty and (2) accounting for the burden of diseases in low income countries. We found that the relationship between the burden and the level of diseases specific funding decreases for people living in low income countries. We find the best predictor for the level of funding to be the mortality in high income countries. In contrast to previous studies, we were able to include more diseases into our analyses (74). This enabled us to discover differences in funding levels between and within groups of diseases. we found that research on cancers was over funded with respect to the associated burden. In contrast, diseases of poverty systematically receive less funding than would be expected based on their burden. Other groups of diseases (cardiovascular diseases and mental illnesses) contained both over and under funded diseases.  相似文献   

A factor-analytic study of the first grade screening test     

Dieter H. Paulus  Joseph S. Renzulli 《Psychology in the schools》1971,8(1):57-59

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Editorial des Geschäftsführenden Herausgebers zum Beginn des 10. Jahrgangs der ZfE     

Dieter Lenzen 《Zeitschrift für Erziehungswissenschaft》2007,10(1):3-4

Ohne Zusammenfassung  相似文献   

Erratum to: “FearNot!”: a computer-based anti-bullying-programme designed to foster peer intervention     

Natalie Vannini  Sibylle Enz  Maria Sapouna  Dieter Wolke  Scott Watson  Sarah Woods  Kerstin Dautenhahn  Lynne Hall  Ana Paiva  Elisabeth André  Ruth Aylett  Wolfgang Schneider 《European Journal of Psychology of Education - EJPE》2013,28(2):597-598

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Schulerfolg und Akkulturationsleistungen von Grundschulkindern mit Migrationshintergrund     

Prof. Dr. Leonie Herwartz-Emden  Dieter Küffner 《Zeitschrift für Erziehungswissenschaft》2006,9(2):240-254

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The genetic code: Yesterday, today, and tomorrow     

Jiqiang Ling  Dieter Söll 《Resonance》2012,17(12):1136-1142

This issue is a tribute to Har Gobind Khorana who received the Nobel Prize in Physiology or Medicine in 1968 for the elucidation of the Genetic Code. Here we present our view of the changing and ever-challenging perception of the genetic code over the last 50 years.  相似文献   

The impact of new public management instruments on PhD education   总被引：1，自引：0，他引：1  

Peter Schneider  Dieter Sadowski 《Higher Education》2010,59(5):543-565

New public governance emphasises less state, more market and more hierarchy as the cornerstones for effective steering of higher education institutions. Based on an explorative analysis of qualitative and quantitative data of fourteen German and European economics departments, we investigate the steering effects of six new public management instruments in the years 2001 and 2002 on subsequent placement success of PhD graduates. Using crisp set Qualitative Comparative Analysis to analyse the data, our results deliver strong support for the positive effects of competition for resources and the varying effects of hierarchy on PhD education. Governance of successful departments is characterised by two solutions: transparency over academic achievements as one single success factor in each solution or a combination of additional funding based on national competitive performance with either no public policy regulations for departments or no university regulations for departments. Governance of unsuccessful departments is characterised by one solution: university regulations for departments or a combination of no additional funding based on national competitive performance and no transparency over academic achievements. Our results strengthen the strong impact of selected competitive mechanisms as an effective governance instrument and the partially detrimental effects of state regulations. University regulations turn out to be successful if they increase transparency over academic achievements by faculty members. Success is unlikely if those rules intervene into PhD education.  相似文献