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Arne Güllich Peter Kovar Sebastian Zart Ansgar Reimann 《Journal of sports sciences》2017,35(3):207-215
This study examined contributions of different types of sport activities to the development of elite youth soccer performance. Match-play performance of 44 German male players was assessed by expert coaches twice, 24 months apart (age 11.1–13.1 years), based on videotaped 5v5 matches. Player pairs were matched by identical age and initial performance at t1. Each player was assigned to a group of either “Strong” or “Weak Responders” based on a higher or lower subsequent performance improvement at t2 within each pair (mean Δperformance 29% vs. 7%). A questionnaire recorded current and earlier amounts of organised practice/training and non-organised sporting play, in soccer and other sports, respectively. Group comparison revealed that “Strong Responders” accumulated more non-organised soccer play and organised practice/training in other sports, but not more organised soccer practice/training. Subsequent multivariate analyses (multiple linear regression analyses (MLR)) highlighted that higher resultant match-play performance at t2 was accounted for R2adj = 0.65 by performance at t1, together with more non-organised soccer play and organised engagement in other sports, respectively, and greater current, but less earlier volume of organised soccer. The findings suggest that variable early sporting experience facilitates subsequent soccer performance development in German elite youth footballers. 相似文献
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Jensen TK Gulbrandsen W Mossige S Reichelt S Tjersland OA 《Child abuse & neglect》2005,29(12):1395-1413
OBJECTIVE: The present study investigated the context in which children were able to report their child sexual abuse experiences and the children's views as to what made it difficult to talk about abuse and what helped them in the disclosing process. The aim was to study disclosures as they were occurring in their natural settings. METHOD: Data were obtained from therapeutic sessions and follow-up interviews from 20 families with 22 children. These children had said something that made their caregivers concerned about ongoing child sexual abuse. Qualitative analysis was conducted to capture the children's and caregiver's perspectives of the disclosure process. RESULTS: The children felt it was difficult to find situations containing enough privacy and prompts that they could share their experiences. They also were sensitive to others reactions, and whether their disclosures would be misinterpreted. When the children did disclose they did it in situations where the theme of child sexual abuse was in some form addressed or activated. The results indicate that disclosure is a fundamentally dialogical process that becomes less difficult if the children perceive that there is an opportunity to talk, and a purpose for speaking, and a connection has been established to what they are talking about. CONCLUSIONS: It is difficult for children to initiate a conversation about something secret, confusing and distressful, and where there are few conversational routines in a family for talking about such themes. Children also are sensitive to the needs of their caregivers and fear consequences for their family and offender. Children need a supportive structure or scaffold in order to reveal their experiences of child sexual abuse. 相似文献
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Skar Gustaf B. Lei Pui-Wa Graham Steve Aasen Arne Johannes Johansen Marita Byberg Kvistad Anne Holten 《Reading and writing》2022,35(2):509-538
Reading and Writing - Until children can produce letters quickly and accurately, it is assumed that handwriting disrupts and limits the quality of their text. This investigation is the largest... 相似文献
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Even though female students now make up more than half of all higher education students in many countries, the distribution
of women across fields of study is still very uneven. This study examines the gendered nature of recruitment and dropout in
higher education. Our results show that students who made gender traditional choices more often had an early preference for
the study programme they enrolled in. Moreover, female students reported more often than male students that they had been
encouraged by their parents and friends. However, unlike what we expected, there are no differences between students in gender
traditional and non-traditional programmes with regard to encouragement from parents and students’ confidence that they had
made the right choice. While male students’ dropout is unrelated to the gender composition of educational programmes, women
drop out of female-dominated programmes to a lesser extent.
相似文献
| Jens-Christian SmebyEmail: |
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Solveig Holen Trine Waaktaar Arne Lervåg Mette Ystgaard 《Scandinavian Journal of Educational Research》2013,57(4):420-444
The purpose of this study was to investigate the possible academic and classroom climate effects of the universal school program Zippy's Friends, the primary objective of which is to strengthen children's ability to cope with stress. The sample consisted of 1483 children (aged 7–8 years) from 91 second-grade classes in 35 schools. The schools were matched and randomly assigned to intervention and control conditions. Classroom social climate and academic skills were assessed by the teachers and the children using an adapted version of the German scale SIKS (Social Integration, Classroom Climate and Self-concept of School Readiness). Using a multilevel approach, regression analysis of teacher reports indicated that the program had a positive effect on the social climate in the classroom, reduced bullying and improved academic skills. Analysis of children's reports found no significant overall effects. The results were not influenced by students' sex or socioeconomic status. 相似文献
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Svein Arne Pettersen Peter Krustrup Mads Bendiksen Morten Bredsgaard Randers Joao Brito Jens Bangsbo 《Journal of sports sciences》2014,32(20):1958-1965
AbstractThe study examined the effect of caffeine supplementation on match activities and development of fatigue during a football match. In a randomised, double-blind cross-over design, two experimental football games separated by 7 days were organised between the junior teams of two professional football clubs (17.6 ± 1.1 years (±s), 71.7 ± 6.9 kg, 13.9% ± 5.0% body fat). The players ingested either a capsule of 6 mg · kg?1 b.w. caffeine or placebo (dextrose) 65 min prior to the matches. Match activities were assessed using the ZXY match analysis system, and a Yo-Yo intermittent recovery test–level 2 (Yo-Yo IR2) was conducted immediately post-game. Heart rate was monitored throughout the game, and blood samples were obtained at baseline, half-time and after the game. There were no differences between caffeine and placebo regarding total distance covered (10,062 ± 916 vs 9854 ± 901 m), high-intensity running (557 ± 178 vs 642 ± 240 m), sprinting distance (109 ± 58 vs 112 ± 69 m) or acceleration counts (123 ± 31 vs 126 ± 24). In both trials, players displayed lower (P < 0.05) values in total distance and acceleration counts in the last 15 min compared to all other 15-min periods of the matches. Post-game Yo-Yo IR2 performance was not different between game trials (caffeine: 829 ± 322 m; placebo 819 ± 289 m). In conclusion, oral caffeine administration does not appear to have an ergogenic effect in young football players during match play. 相似文献
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This paper proposes a gain-scheduling approach for systems with a quadratic structure. Both the stability analysis and the state-feedback controller design problems are considered for quadratic parameter varying (QPV) systems. The developed approach assesses/enforces the belonging of a polytopic region of the state space to the region of attraction of the origin, and relies on a linear matrix inequality (LMI) feasibility problem. The main characteristics of the proposed approach are illustrated by means of examples, which confirm the validity of the theoretical results. 相似文献
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