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Dieter Deprez Job Fransen Jan Boone Matthieu Lenoir Renaat Philippaerts Roel Vaeyens 《Journal of sports sciences》2015,33(3):243-254
The present study aimed to investigate positional differences in 744 high-level soccer players, aged 8 to 18 years. Players were assigned to six age groups (U9–U19) and divided into four playing positions (goalkeeper (GK), defender (DEF), midfielder (MF) and attacker (ATT)). MANOVA and effect sizes were used to examine anthropometrical and functional characteristics between all positions in all age groups. The main findings of the study were that GKs and DEFs were the tallest and heaviest compared with MFs and ATTs in all age groups. Further, between U9–U15, no significant differences in functional characteristics were found, except for dribbling skill, which MFs performed the best. In the U17–U19 age groups, ATTs seemed to be the most explosive (with GKs), the fastest and the more agile field players. These results suggest that inherent physical capacities (i.e., speed, power, agility) might select players in or reject players from an attacking position, which is still possible from U15–U17. Apparently, players with excellent dribbling skills at younger age are more likely to be selected to play as a MF, although, one might conclude that the typical physical characteristics for different positions at senior level are not yet fully developed among young soccer players between 8 and 14 years. 相似文献
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Competitive sport has been under increasing discussion as a possible favourable factor in the development of eating disorders among children and adolescents. The aim of this study was to determine the frequency of sport-specific eating disorders, in line with the concept of anorexia athletica. This prospective field study included one experimental group and two control groups (disease and healthy). Fifty-two pre-professional ballet dancers aged 13-20 years were tested for clinical eating disorders, anorexia athletica criteria, eating disorder related psychopathology and self-concept, and were compared with 52 patients with anorexia nervosa and 44 non-athletic controls of the same age. The study was conducted using semi-structured interviews as well as self-report questionnaires. A clinical eating disorder diagnosis was made in 1.9% of the ballet dancers versus 0% of the high school students; anorexia athletica was diagnosed in 5.8% of the dancers versus 2.3% of the students. Ballet dancers scored lower than patients with anorexia nervosa with regard to eating disorder related psychopathology and higher than the patients with regard to self-concept. We conclude that more sensitive tools to differentiate between sport-specific (eating) patterns, anorexia athletica and clinically relevant eating disorders are needed, especially for aesthetic sports such as ballet. It remains an important goal to identify athletes with symptoms of anorexia athletica irrespective of their physique and/or sport. 相似文献
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3. Alfred K. Treml: Allgemeine Pädagogik. Grundlagen, Handlungsfelder und Perspektiven der Erziehung
Karl Ernst Nipkow 《Zeitschrift für Erziehungswissenschaft》2002,5(1):166-167
Ohne Zusammenfassung 相似文献
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Dieter Lohr 《Higher Education in Europe》2001,26(4):547-552
The instructor in a course in German writing offered electronically at the University of Konstanz in Germany to students at the Alexandru Ioan Cuza University of Ias¸i describes the course. He has used it to teach different styles of writing interactively and to initiate his students in the use of the computer and the Web for the undertaking of research in German literature. He has attempted to structure and to operate his course in such a way as to bring the special characteristics of on-line teaching and learning to the fore and not simply to replicate a traditional course on-line, a frequent situation with on-line teaching and learning. 相似文献
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