Energetic demand and physical conditioning of table tennis players. A study review     

Alessandro Moura Zagatto  Miran Kondric  Beat Knechtle  Pantelis Theo Nikolaidis  Billy Sperlich 《Journal of sports sciences》2018,36(7):724-731

Table tennis is a racket sport characterised by an intermittent movement profile, including short rallies interspersed with short breaks. In contrast to other racket sports, information is lacking regarding the: (i) physiological responses during table tennis matches and training; and (ii) practical recommendations for enhancing aerobic and anaerobic performance in table tennis by improving cardio-metabolic and neuro-muscular fitness, anthropometry and nutritional strategies. Therefore, this review article attempts to narratively provide an overview of the physiology of table tennis by describing the metabolic mechanisms underlying match play and outlining a framework for practical recommendations for improving cardio-metabolic and neuro-muscular fitness, anthropometry as well as nutritional strategies. A second aim was to stimulate future research on table tennis and to point out study limitations in this context. In general, the most important finding is that the rally duration is short at around 3.5s, with a longer rest time of around 8–20s, resulting in an effort-rest ratio ranging from 0.15 to 0.22 in official matches and energetic demands during match relatively low. Future studies should focus on the relationship between energetic demand and table tennis performance with a view to predicting performance in table tennis using physiological parameters.  相似文献   

Editorial     

Peter Horsman  Eric Ketelaar  Theo Thomassen 《Archival Science》1987,1(2):129

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The Educational Attitudes and Views about School of a Sample of Disadvantaged Fifteen‐year‐olds     

Theo Cox 《Educational studies》1983,9(2):69-79

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Datenbank-Caching - Eine systematische Analyse m?glicher Verfahren     

Theo H?rder  Andreas Bühmann 《Informatik - Forschung und Entwicklung》2004,17(4):2-16

Caching ist ein bewährtes Mittel, um die Skalier- und Verfügbarkeit von Systemen zu steigern sowie die Latenzzeit für Benutzeranforderungen zu verkürzen. Im Gegensatz zum Web-Caching, bei dem einzelne Web-Objekte irgendwo längs ihres Aufrufpfades in der Proxy-Kette vorgehalten werden, setzt Datenbank-Caching ausgewachsene Datenbanksysteme als Caches ein, um dort Satzmengen entfernter Datenbanken möglichst adaptiv verwalten und Anfragen darauf auswerten zu können. Verfahren dazu reichen von separat verwalteten materialisierten Sichten über überlappende, aber replikationsfrei gespeicherte Sichten bis hin zu Cache-Groups, in denen parametrisierte Cache-Constraints den Cache-Inhalt spezifizieren. Wir untersuchen anschaulich die verschiedenen Ansätze und ermitteln daraus eine Klassifikation, die den Lösungsraum zu enthüllen hilft. Im Mittelpunkt steht das Konzept der Prädikatsvollständigkeit: Ein Datenbank-Cache verwaltet vollständige Extensionen von Prädikaten, was ihm ermöglicht, Schlüsse über beantwortbare Anfragen zu ziehen.  相似文献   

A multidimensional approach to examine student interdisciplinary learning in science and engineering in higher education     

Elisabeth Jacoba Hendrika Spelt  Pieternelleke Arianne Luning  Martinus A. J. S. van Boekel  Martin Mulder 《European Journal of Engineering Education》2017,42(6):761-774

Preparing science and engineering students to work in interdisciplinary teams necessitates research on teaching and learning of interdisciplinary thinking. A multidimensional approach was taken to examine student interdisciplinary learning in a master course on food quality management. The collected 615 student experiences were analysed for the cognitive, emotional, and social learning dimensions using the learning theory of Illeris. Of these 615 experiences, the analysis showed that students reported 214, 194, and 207 times on, respectively, the emotional, the cognitive, and the social dimension. Per learning dimension, key learning experiences featuring interdisciplinary learning were identified such as ‘frustrations in selecting and matching disciplinary knowledge to complex problems’ (emotional), ‘understanding how to apply theoretical models or concepts to real-world situations’ (cognitive), and ‘socially engaging with peers to recognise similarities in perceptions and experiences’ (social). Furthermore, the results showed that students appreciated the cognitive dimension relatively more than the emotional and social dimensions.  相似文献   

Looking for students’ personal characteristics predicting study outcome     

Cyrille A. C. Van Bragt  Anouke W. E. A. Bakx  Theo C. M. Bergen  Marcel A. Croon 《Higher Education》2011,61(1):59-75

The central goal of this study is to clarify to what degree former education and students’ personal characteristics (the ‘Big Five personality characteristics’, personal orientations on learning and students’ study approach) may predict study outcome (required credits and study continuance). Analysis of the data gathered through questionnaires of 1,471 Universities of Applied Sciences students make clear that former Education did not come forth as a powerful predictor for Credits or Study Continuance. Significant predictors are Conscientiousness and Ambivalence and Lack of Regulation. The higher the scores on Conscientiousness the more credits students are bound to obtain and the more likely they will continue their education. On the other hand students with high scores on Ambivalence and Lack of Regulation will most likely obtain fewer Credits or drop out more easily. The question arises what these results mean for the present knowledge economy which demands an increase of inhabitants with an advanced level of education. Finally, implications and recommendations for future research are suggested.  相似文献   

Exploring a two-dimensional model of mentor teacher roles in mentoring dialogues     

Frank Crasborn  Paul HennissenNiels Brouwer  Fred Korthagen  Theo Bergen 《Teaching and Teacher Education》2011,27(2):320-331

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Clarifying pre-service teacher perceptions of mentor teachers’ developing use of mentoring skills     

Paul Hennissen  Frank CrasbornNiels Brouwer  Fred Korthagen  Theo Bergen 《Teaching and Teacher Education》2011,27(6):1049-1058

The aim of this study is to clarify how pre-service teachers perceive mentor teachers’ use of mentoring skills. Sixty stimulated-recall interviews were conducted, each in connection with a previously recorded mentoring dialogue. A quantitative analysis showed that six types of mentoring skills appeared to be perceived by pre-service teachers as offering emotional support and five others as offering task assistance. After mentor teachers were trained in mentoring skills, shifts in their frequencies of use of distinct skills, as observed by independent raters, corresponded to a considerable extent with shifts in frequencies of pre-service teacher perceptions of mentor teachers’ mentoring behaviour.  相似文献   

Coercive and supportive teacher behaviour: Within- and across-lesson associations with the classroom social climate     

M. Tim Mainhard  Mieke Brekelmans Theo Wubbels 《Learning and Instruction》2011,21(3):345-354

The present study investigated whether the classroom social climate varies between lessons. Specifically, the within- and across-lesson associations of coercive and supportive teacher behaviour incidents with the classroom social climate were studied. Participants in the study were 48 Dutch secondary school teachers and their classes, that is, 1208 students. Multilevel process analyses showed that supportive behaviour incidents correlated with a positive social climate during the current lesson and the lesson a week later in terms of teacher interpersonal proximity. Supportive behaviour incidents did not, however, correlate with social climate in terms of teacher interpersonal influence. Coercive behaviour incidents correlated with disrupted teacher proximity during the current lesson and the lesson a week later, but did not virtually correlate to increased levels of a teacher’s influence in the classroom.  相似文献   

Vocational Education and Training: Researching the Relationship between School and Work     

Regina H. Mulder  Gerhard Messmann  Christoph König 《European Journal of Education》2015,50(4):497-512

Researchers and policy makers agree that the relation between school and work is an important characteristic of vocational education and training (VET) and needs attention. The relation itself poses several challenges for research to be successful and useful for policy makers. In this article, we outline these challenges and answer the following question: What needs to be considered when researching the relation between school and work? Our central claim is that research on the relation between school and work needs to (1) take into account contextual conditions of the VET system, including identifying the central actors and their responsibilities within a VET system, (2) take into account the characteristics of VET itself, (3) define the quality of the relation between school and work (depending on the context, characteristics of the VET system and VET itself), and (4) be consistent with respect to chosen research aims and paradigms. To illustrate how these aspects can be taken into account an example of empirical research conducted in the German dual apprenticeship system is described. The readers are provided with guidelines for researchers and policy makers to carry out high quality research on the relation between school and work in VET systems that enables policy makers to make use of the results to improve the relation between school and work in VET systems.  相似文献