Timescales for exploratory tactical behaviour in football small-sided games     

Angel Ric  Robert Hristovski  Bruno Gonçalves  Lorena Torres  Jaime Sampaio  Carlota Torrents 《Journal of sports sciences》2016,34(18):1723-1730

The aim of this study was to identify the dynamics of tactical behaviour emerging on different timescales in football small-sided games and to quantify short- and long-term exploratory behaviour according to the number of opponents. Two teams of four professional male footballers played small-sided games against two different teams with a variable number of opponents (3, 5 and 7). Data were collected using a combination of systematic observation and a non-differential global positioning system (15 Hz). The temporal diversity and structural flexibility of the players were determined by calculating the dynamic overlap order parameter q, entropy and trapping strength. Analysis of the exploratory dynamics revealed two different timescales, forming a different metastable landscape of action for each constraint. Fast dynamics lasted on average a few seconds and consisted of changes in tactical patterns. The long timescale corresponded to the shared tasks of offence and defence lasting tens of seconds. The players’ tactical diversity decreased with an increasing number of opponents, especially in defence. Manipulating numerical imbalance is likely to promote changes in the diversity, unpredictability and flexibility of tactical solutions. The fact that the temporally nested structure of constraints shaped the emergence of tactical behaviour provides a new rationale for practice task design. The manipulation of numerical imbalance on the timescale of a few tens of seconds, on which the exploratory behaviour of players saturates, may help coaches to optimise the exploratory efficiency of the small-sided games.  相似文献   

Remote ischaemic preconditioning shortens QT intervals during exercise in healthy subjects     

Maxime Caru  François Lalonde  Hugo Gravel  Chantal Daigle  François Tournoux  Vincent Jacquemet 《European Journal of Sport Science》2016,16(8):1005-1013

The protective action of remote ischaemic preconditioning (RIPC) has been demonstrated in the context of surgical interventions in cardiology. Application of RIPC to sports performance has been proposed, but its effect on the electrocardiogram (ECG) during exercise remains unknown. This exploratory study aims to measure the changes in ventricular repolarization observed during exercise following RIPC in healthy subjects. In an experimental randomized crossover study, 17 subjects underwent two bouts of constant load exercise tests at 75% and 115% of gas exchange threshold (GET). Prior to exercise, they were allocated to either control or RIPC intervention with four cycles of 5?min of ischaemia followed by 5?min of reperfusion. ECG was continuously recorded during the protocol. QT and RR intervals were measured every 30?s (on an average tracing of the preceding 10?s). Although the time course of RR intervals did not differ between the two interventions (p?=?.56 at 75% GET and p?=?.74 at 115% GET), a significant shortening of QT intervals (measured from Q onset to T end) was observed during exercise (mean?±?standard deviation of RIPC vs. control: ?32?±?19?ms at 75% GET (p?p?p?p?相似文献   

Understanding the consequences of victory amongst sport spectators: The mediating role of BIRGing     

Iouri Bernache-Assollant  Yves Chantal  Patrick Bouchet  Marie-Françoise Lacassagne 《European Journal of Sport Science》2016,16(6):719-725

Prior work on the relationships between team identification and spectators’ reactions to one's team victory has largely neglected the potential effects of mediating variables. In this research, we proposed that the process of Basking in Reflected Glory [BIRGing – the tendency to reduce the distance between oneself and one's team; Cialdini, R. B., Bordon, R. J., Thorne, A., Walker, M. R., Freeman, S., &; Sloan, L. R. (1976). Basking in reflected glory: Three (football) field studies. Journal of Personality and Social Psychology, 34, 366–375] would lead spectators to almost take ownership of victories and share its benefits, thereby impacting their sense of national belonging in a positive manner. To this end, participants (N?=?73) were asked to watch an edited video clip showing a victory of the French national rugby team playing against South Africa. As expected, results revealed that BIRGing mediated the relationship between team identification and one's sense of national belonging. In closing, a number of implications are discussed along with future research avenues pertaining to the sport spectatorship literature.  相似文献   

An Integrative Model for the Study of Developmental Competencies in Minority Children   总被引：36，自引：0，他引：36  

Cynthia García Coll  Keith Crnic  Gontran Lamberty  Barbara Hanna Wasik  Renee Jenkins  Heidie Vázquez García  Harriet Pipes McAdoo 《Child development》1996,67(5):1891-1914

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The Experience of the Teaching Expedition and Teacher Networks: New Modes of Training?     

Unda  María Pilar 《Prospects》2002,32(3)

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Understanding the Gaps Between Turkish Teachers’ Beliefs and Practices for Dealing With Preschoolers’ Peer Relationship Problems     

Çağla Öneren Şendil  Feyza Tantekin Erden 《Early education and development》2019,30(5):608-638

Research Findings: This study explores the beliefs, self-reported practices, and observed practices of Turkish preschool teachers toward children’s peer relationship problems as well as the gap between their beliefs and practices. Five female teachers of 5-year-old children were selected as participants for this multiple case study. Approximately 79 hr of observation was conducted on the children’s daily routines and activities in a natural classroom environment, which specifically included the teachers’ problem-solving strategies while confronting peer relationship problems. The participants were also interviewed regarding their beliefs and strategies for solving peer relationship problems. The findings of this qualitative investigation indicated that the teachers’ beliefs and self-reported practices included both teacher- and child-related factors. However, the observed practices included several teacher-initiated strategies; child-initiated strategies appeared, albeit less than teacher-initiated ones. This affirms the teachers’ stress on children’s role in managing peer problems. Although some of the teacher practices and beliefs were consistent, certain inconsistencies may indicate the presence of external constraints. Practice or Policy: The results of this study highlight the importance of teacher education programs providing preservice and in-service teachers with the knowledge and skills required to understand children’s peer relationships, guide their interactions, and apply appropriate intervention strategies for various peer relationship problems.  相似文献   

“Lo que yo en realidad quería hacer”: Rationales of Latina/o DACA Recipients for Pursuing Careers as Teachers     

García  José 《The Urban Review》2020,52(5):830-852

The Urban Review - The decision to rescind Deferred Action for Childhood Arrivals (DACA) will have major repercussions amongst beneficiaries, especially in terms of employment. One of the sectors...  相似文献   

Innovative moments and narrative change in career counselling: a case study     

da Silva  Cláudia Sampaio Corrêa  Teixeira  Marco Antônio Pereira  Cardoso  Paulo  Fernández-Navarro  Pablo  Gonçalves  Miguel M.  Duarte  Maria Eduarda 《International Journal for Educational and Vocational Guidance》2020,20(3):635-652

International Journal for Educational and Vocational Guidance - This case study of an undecided university student has two aims: to assess the effect of life design career counselling on...  相似文献   

对提升高校教师科学素质的思考     

陈耀辉  李成军  游金辉 《内江师范学院学报》2011,26(10):82-86

2020年建成创新型国家是我国本世纪的宏伟目标,要实现这个目标,需要大批素质高能力强的创新型人才．高校教师既是创新型国家建设的主力军,又是培养建设创新型国家高素质人才的教育者,因此提升高校教师科学素质是我国建设创新型国家的迫切需要．目前我国高校教师的科学素质现状难以胜任创新型国家建设主力军和创新型人才培养的双重任务,必须采取有效措施和途径,提升高校教师的科学素质,为创新型国家建设做贡献．  相似文献   

Learning Is Moving in New Ways: The Ecological Dynamics of Mathematics Education     

Dor Abrahamson  Raúl Sánchez-García 《学习科学杂志》2016,25(2):203-239

Whereas emerging technologies, such as touchscreen tablets, are bringing sensorimotor interaction back into mathematics learning activities, existing educational theory is not geared to inform or analyze passages from action to concept. We present case studies of tutor–student behaviors in an embodied-interaction learning environment, the Mathematical Imagery Trainer. Drawing on ecological dynamics—a blend of dynamical-systems theory and ecological psychology—we explain and demonstrate that: (a) students develop sensorimotor schemes as solutions to interaction problems; (b) each scheme is oriented on an attentional anchor—a real or imagined object, area, or other aspect or behavior of the perceptual manifold that emerges to facilitate motor-action coordination; and (c) when symbolic artifacts are introduced into the arena, they may both mediate new affordances for students’ motor-action control and shift their discourse into explicit mathematical re-visualization of the environment. Symbolic artifacts are ontological hybrids evolving from things with which you act to things with which you think. Students engaged in embodied-interaction learning activities are first attracted to symbolic artifacts as prehensible environmental features optimizing their grip on the world, yet in the course of enacting the improved control routines, the artifacts become frames of reference for establishing and articulating quantitative systems known as mathematical reasoning.  相似文献