A longitudinal study of multidimensional performance characteristics related to physical capacities in youth handball     

Stijn P.J. Matthys  Roel Vaeyens  Job Fransen  Dieter Deprez  Johan Pion  Joric Vandendriessche 《Journal of sports sciences》2013,31(3):325-334

Abstract

Longitudinal research provides valuable information about change and progress towards elite performance. Unfortunately, there is a lack of longitudinal research in handball. In this study, 94 youth handball players (oldest group: n = 41; age 15–17 and youngest group: n = 53; age 13–15) were followed over a three-year period. Repeated Measures ANCOVA was conducted to reveal longitudinal changes in anthropometry and physical performance between elite and non-elite players, controlling for maturation. Maturation effects were found for anthropometry (P < 0.01) and some physical performance measures in strength and speed (P < 0.05). The lack of significant interaction effects revealed that during the three years of the study the elite players did not improve their physical performance more rapidly than the non-elites. Furthermore, they had a similar anthropometric profile to the non-elites. Elite players performed better on the Yo-Yo Intermittent Recovery test (P < 0.01; on average 24.0 in the youngest group and 25.2% in the oldest group over the three years) and on the speed and coordination items (P < 0.05; shuttle run: 3.6 and 5.1%; cross hopping: 11.0 and 14.8%, handball-specific shuttle run: 7.6 and 7.7%; slalom dribble test: 10.7 and 8.9%; sprint 30 m: 4.9 and 3.9%). Additionally, Yo-Yo performance and coordination with and without a ball were the most discriminating factors between the playing levels. In conclusion, youth coaches and scouts within team handball should recognise the importance of good skills and an excellent endurance for talent identification purposes.  相似文献   

Capturing information on technology convergence,international collaboration,and knowledge flow from patent documents: A case of information and communication technology     

Changjun Lee  Dieter Franz Kogler  Daeho Lee 《Information processing & management》2019,56(4):1576-1591

In addressing persistent gaps in existing theories, recent advances in data-driven research approaches offer novel perspectives and exciting insights across a spectrum of scientific fields concerned with technological change and the socio-economic impact thereof. The present investigation suggests a novel approach to identify and analyze the evolution of technology sectors, in this case, information and communications technology (ICT), considering international collaboration patterns and knowledge flows and spillovers via information inputs derived from patent documents.The objective is to utilize and explore information regarding inventors’ geo-location, technology sector classifications, and patent citation records to construct various types of networks. This, in turn, will open up avenues to discover the nature of evolutionary pathways in ICT trajectories and will also provide evidence of how the overall ICT knowledge space, as well as directional knowledge flows within the ICT space, have evolved differently. It is expected that this data-driven inquiry will deliver intuitive results for decision makers seeking evidence for future resource allocation and who are interested in identifying well-suited collaborators for the development of potential next-generation technologies. Further, it will equip researchers in technology management, economic geography, or similar fields with a systematic approach to analyze evolutionary pathways of technological advancements and further enable exploitation and development of new theories regarding technological change and its socio-economic consequences.  相似文献   

Utilizing microfluidics to synthesize polyethylene glycol microbeads for Förster resonance energy transfer based glucose sensing     

Kantak C  Zhu Q  Beyer S  Bansal T  Trau D 《Biomicrofluidics》2012,6(2):22006-220069

Here, we utilize microfluidic droplet technology to generate photopolymerizeable polyethylene glycol (PEG) hydrogel microbeads incorporating a fluorescence-based glucose bioassay. A microfluidic T-junction and multiphase flow of fluorescein isothiocyanate dextran, tetramethyl rhodamine isothiocyanate concanavalin A, and PEG in water were used to generate microdroplets in a continuous stream of hexadecane. The microdroplets were photopolymerized mid-stream with ultraviolet light exposure to form PEG microbeads and were collected at the outlet for further analysis. Devices were prototyped in PDMS and generated highly monodisperse 72?±?2 μm sized microbeads (measured after transfer into aqueous phase) at a continuous flow rate between 0.04 ml/h-0.06 ml/h. Scanning electron microscopy analysis was conducted to analyze and confirm microbead integrity and surface morphology. Glucose sensing was carried out using a F?rster resonance energy transfer (FRET) based assay. A proportional fluorescence intensity increase was measured within a 1-10 mM glucose concentration range. Microfluidically synthesized microbeads encapsulating sensing biomolecules offer a quick and low cost method to generate monodisperse biosensors for a variety of applications including cell cultures systems, tissue engineering, etc.  相似文献   

Soziologie in der DDR     

Dieter Voigt  K. Heinemann 《Sportwissenschaft》1976,6(3):329-332

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The 2005 Benjamin Franklin medal in physics presented to Yoichiro Nambu     

Dieter Forster ^{Author Vitae} 《Journal of The Franklin Institute》2006,343(3):263-270

The Franklin Institute, Philadelphia, Pennsylvania, awarded the 2005 Benjamin Franklin medal in physics to Yoichiro Nambu for his seminal contributions which introduced the modern concept of broken symmetry to elementary particle physics, for his invention of the particle property called color which is the key to quark confinement, and for his ground-breaking work on the theory of string-like elementary particles.  相似文献   

An empirical investigation of a compact school day for first-grade children     

Francis X. Archambault  Dieter H. Paulus 《Psychology in the schools》1972,9(1):4-8

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New books in review     

E. J. West  John W. Black  Otto A. Dieter  Wendell Johnson  Donald C. Bryant 《Quarterly Journal of Speech》2013,99(3):372-395

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Resilience to bullying victimization: The role of individual,family and peer characteristics     

Maria Sapouna  Dieter Wolke 《Child abuse & neglect》2013

Little research attention has been paid to bullied students who function better than expected and are therefore defined as “resilient”. The present longitudinal study aimed to identify individual, family and peer factors that predict fewer than expected levels of depression and delinquency following experiences of bullying victimization. The sample consisted 3,136 adolescents. Self-report data were used to measure bullying victimization at age 13 and 14 and depression and delinquency at age 14. We examined the effects of gender, self-esteem, social alienation, parental conflict, sibling victimization and number of close friends on levels of emotional and behavioral resilience following bullying victimization. The resilience measures were derived by regressing depression and delinquency scores at age 14 on levels of bullying victimization at age 13 and 14, respectively. The adolescents who reported low depression despite frequently experiencing bullying tended to be male, had higher self-esteem, were feeling less socially alienated, were experiencing low levels of conflict with parents and were not victimized by siblings. On the other hand, the adolescents who reported low delinquency despite frequently experiencing bullying tended to be female, had higher self-esteem, were experiencing low levels of conflict with parents, were not victimized by siblings and had less close friends. Relationships with parents and siblings continue to play some role in promoting emotional and behavioral adjustment among victims of bullying and, therefore, interventions are more likely to be successful if they target both the psychosocial skills of adolescents and their relationships with their family.  相似文献   

Foot loading characteristics during three fencing-specific movements   总被引：1，自引：1，他引：0  

Trautmann C  Martinelli N  Rosenbaum D 《Journal of sports sciences》2011,29(15):1585-1592

Plantar pressure characteristics during fencing movements may provide more specific information about the influence of foot loading on overload injury patterns. Twenty-nine experienced fencers participated in the study. Three fencing-specific movements (lunge, advance, retreat) and normal running were performed with three different shoe models: Ballestra (Nike, USA), Adistar Fencing Lo (Adidas, Germany), and the fencers' own shoes. The Pedar system (Novel, Munich, Germany) was used to collect plantar pressures at 50 Hz. Peak pressures, force-time integrals and contact times for five foot regions were compared between four athletic tasks in the lunge leg and supporting leg. Plantar pressure analysis revealed characteristic pressure distribution patterns for the fencing movements. For the lunge leg, during the lunge and advance movements the heel is predominantly loaded; during retreat, it is the hallux. For the supporting leg, during the lunge and advance movements the forefoot is predominantly loaded; during retreat, it is the hallux. Fencing-specific movements load the plantar surface in a distinct way compared with running. An effective cushioning in the heel and hallux region would help to minimize foot loading during fencing-specific movements.  相似文献   

2. German-Language Studies     

Susan Sontag  Melissa Milar  William Brohaugh  John S. Carroll  Dieter Frobisch  Hartmut Lamprecht 《Communication Booknotes Quarterly》2013,44(1):16-18

Susan Sontag's On Photography (New York: Farrar, Straus &; Giroux, 1977—$7.95)

Melissa Milar and William Brohaugh, eds. 1978 Photographer's Market (Cincinatti, Ohio: Writer's Digest, 1977—$9.95)

John S. Carroll's Photographic Lab Handbook (Garden City, N.Y.: Amphoto, 1977—$10.95, paper)

Dieter Frobisch and Hartmut Lamprecht's Graphic Photo Design: Lab Techniques in Color and Black and White (Garden City, N.Y.: Amphoto, 1977—$14.95)

Dennis Longwell's Steichen: The Master Prints, 1895-1914: The Symbolist Period (New York: Museum of Modern Art/Boston: New York Graphic Society, 1978—$35.00)

Neal Slavin's When Two or More are Gathered Together (New York: Farrar, Straus, Giroux, 1976—$12.95, paper)

Arnold Newnan's Faces USA (Garden City, N.Y.: Amphoto, 1978—$5.95, paper)

Prophotos 1 (Garden City, N.Y.: Amphoto, 1978—$4.95, paper)

Light Vision: Australia's International Photography Magazine (75 Wilson St., South Yarra, Vic. 3141, Australia—19 Australian dollars by surface mail to the U.S. with other and air rates available)

Hal Fischer's Gay Semiotics (NFS Press, P.O. Box 31040, San Francisco 94131—$6.95, paper)

Kent E. Wade, Alternative Photographic Processes (Dobbs Ferry, N.Y.: Morgan &; Morgan, 1978—$11.95, paper)

The Nikon Manual, Incorporating the Nikkormat and Nikonos (Dobbs Ferry, N.Y.: Morgan &; Morgan, 1977—$24.95)  相似文献