Information-governing dynamics of attacker-defender interactions in youth rugby union   总被引：1，自引：1，他引：0  

Passos P  Araújo D  Davids K  Gouveia L  Milho J  Serpa S 《Journal of sports sciences》2008,26(13):1421-1429

Previous work on dynamics of interpersonal interactions in 1 vs. 1 sub-phases of basketball has identified changes in interpersonal distance between an attacker and defender as a potential control parameter for influencing organizational states of attacker-defender dyads. Other studies have reported the constraining effect of relative velocity between an attacker and defender in 1 vs. 1 dyads. To evaluate the relationship between these candidate control parameters, we compared the impact of both interpersonal distance and relative velocity on the pattern-forming dynamics of attacker-defender dyads in the sport of rugby union. Results revealed that when interpersonal distance achieved a critical value of less than 4 m, and relative velocity values increased or were maintained above 1 m x s(-1), a successful outcome (i.e. clean attempt) for an attacker was predicted. Alternatively, when values of relative velocity suddenly decreased below this threshold, at the same critical value of interpersonal distance, a successful outcome for the defender was predicted. Data demonstrated how the coupling of these two potential, nested control parameters moved the dyadic system to phase transitions, characterized as a try or a tackle. Observations suggested that relative velocity increased its influence on the organization of attacker-defender dyads in rugby union over time as spatial proximity to the try line increased.  相似文献   

Classes of developmental trajectories of body mass index: Differences in motor competence and cardiorespiratory fitness     

Vitor P. Lopes  Till Utesch  Luis P. Rodrigues 《Journal of sports sciences》2020,38(6):619-625

ABSTRACT

The purpose was to identify classes of different developmental trajectories of BMI and testing them for differences in motor competence (MC) and cardiorespiratory fitness (CRF), in children and adolescents (4 to 13 years of age). This was a 5 years’ longitudinal study with six cohorts. One hundred and forty-seven children (69 girls) divided into six cohorts participated. At baseline, the youngest and the oldest cohorts had 4 and 11 years of age, respectively. Height and weight were assessed, and BMI was calculated. MC was assessed with KTK and TGMD-2, and CRF was assessed with one-mile run/walk. Developmental trajectories of BMI were identified using latent class linear-mixed modelling. Latent class membership was explained according to covariates of MC and CRF. Two meaningful classes were identified. Class 1 (78.92% of the participants) showed lower initial BMI and a lower slope compared to class 2 (21.08% of the participants) (all ps < 0.001). Class membership only predicted trajectories in motor coordination, with children in class 1 having a better development.

In conclusion, this study identified two meaningful trajectories for children based on their BMI development across five time points. In line with previous research, children with slower increasing BMI showed better motor coordination improvements.  相似文献   

Cardiorespiratory fitness and arm bone mineral health in young males with spinal cord injury: the mediator role of lean mass     

Irene Rodríguez-Gómez  Soraya Martín-Manjarrés  María Martín-García  Sara Vila-Maldonado  Ángel Gil-Agudo  Luis M. Alegre 《Journal of sports sciences》2019,37(7):717-725

Spinal cord injury (SCI) derives in loss of bone mineral content (BMC) and bone mineral density (BMD). However, physical activity is an important determinant in bone mass acquisition, which is partially mediated through the lean mass (LM). The aim was to examine the effect of cardiorespiratory fitness (CRF) on BMD and BMC arms of adult males with SCI and able-bodied controls using the arm LM as a mediator variable. Thirty able-bodied men and thirty men with SCI participated. BMC and BMD were analysed by DXA, and indirect calorimetry was used to calculate VO_2peak during a progressive arm-cranking test. When groups were divided by the amount of LM, the subgroup with highest LM had significantly higher arm BMC compared to the lowest LM subgroup (p ≤ 0.05) in both SCI and able-bodied groups. Moreover, same differences were found when confidence intervals were analysed. Only in the SCI group, arm LM mediated the relationship between bone mass and CRF at 30.9%, as indicated by the Sobel test (z = 2.17 and z = 2.04 for BMC and BMD, respectively). In conclusion, LM mediates the indirect association between CRF and bone health, specifically in the arms. This finding highlights the importance of having an adequate CRF for the maintenance of good bone health in SCI men.  相似文献   

Exploring socioeconomic inequalities and access to elite postgraduate education among English graduates     

Mateos-González  José Luis  Wakeling  Paul 《Higher Education》2022,83(3):673-694

Higher Education - A worldwide trend towards high levels of participation in higher education, paired with concerns about the post-university destinations of an increasing pool of graduates, have...  相似文献   

The Last and Most Developed Naṣrid Palace in the Alhambra: The Alijares and Its Country Estate (Fourteenth Century)     

Luis José García-Pulido 《Al-Masaq: Islam & the Medieval Mediterranean》2017,29(1):60-83

The country estate (al-munya, almunia in Spanish) of the Alijares occupied grounds near the Alhambra and the Generalife, although it was higher up. It was constructed at the peak of the Na?rid dynasty's splendour, during the last stage of the reign of Mu?ammad V (r.1354–1359 / 1362–1391), after he had finished the Palace of the Lions.

The Alijares formed the last link in the chain in the stylistic development of the palaces of al-Andalus. When its founder decided on the features of the Alijares, he was in search of something that was completely innovative, as he had already undertaken work in the medinas of Granada and in the Alhambra that turned out to be a transformation of the architectural forms so far developed.

Life in the palace and the al-munya was cut short by sizeable earthquake in 1431, which coincided with a hard Castilian military campaign against the Kingdom of Granada. The consequences of the allegiance formed after the Na?rid defeat hindered the reconstruction of the Alijares, and so the royal buildings above the Royal Water Channel (Acequia Real) of the Alhambra were abandoned. Although time has erased many of the traces of the palace and its al-munya, we have extensive knowledge of its main architectural features, thanks to an analysis of all the available sources.  相似文献   

Visuospatial Orientation Learning through Virtual Reality for People with Severe Disability     

Alejandro de la Torre-Luque  Luis Valero-Aguayo  Ernesto J. de la Rubia-Cuestas 《International Journal of Disability, Development & Education》2017,64(4):420-435

This study aims to test how an intervention based on virtual reality (VR) may enhance visuospatial skills amongst people with disability. A quasi-experimental intra-group study was therefore conducted. Participants were 20 people with severe disability (65% males; 34.35 years, on average, and 84.95% of disability rate according to the Andalusian Government index). Intervention consisted of 15 sessions of active navigation using a VR building similar to the participants’ day rehabilitation centre with the task of locating different rooms and objects. The time spent and errors in route in the virtual and the real environments were measured before and after the intervention. Additionally, participants had to fill out a map location task. As a result, participants showed fewer errors and less time at post-intervention assessments even with non-trained stimuli (p < .05). These results demonstrate the usefulness of VR-based interventions with active navigation to accelerate orientation learning in real-life situations.  相似文献   

Second Language Creative Writers: Identities and Writing Processes,by Zhao,Y.     

Darío Luis Banegas 《Journal of Language, Identity & Education》2017,16(1):59-61

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Intercorporeality and ethical commitment: an activity perspective on classroom interaction   总被引：1，自引：0，他引：1  

Luis Radford  Wolff-Michael Roth 《Educational Studies in Mathematics》2011,77(2-3):227-245

In this article, we present a sociocultural alternative to contemporary constructivist conceptions of classroom interaction. Drawing on the work of Vygotsky and Leont??ev, we introduce an approach that offers a new perspective through which to understand the specifically human forms of knowing that emerge when people engage in joint activity. To this end, we present two concepts: space of joint action and togethering. The space of joint action allows us to capture the collective and sensuous or intercorporeal dimensions of thought and feeling in interaction. We resort to the concept of togethering to capture the ethical commitment participants make to engage in and produce activity. These concepts are illustrated through a discussion of concrete episodes from an elementary mathematics classroom.  相似文献   

A psychosocial approach to shame,embarrassment and melancholia amongst unemployed young men and their fathers     

Luis Jimenez  Valerie Walkerdine 《Gender and education》2011,23(2):185-199

This paper uses a psychosocial approach to explore young unemployed men’s resistance to work they describe as ‘embarrassing’ and ‘feminine’, in the context of the closure of a steelworks in a town in the South Wales valleys. In our psychosocial interview‐based study, with young men as well as their mothers and (where possible) their fathers, we found a community riven with complex feelings about masculinity and femininity, projected on to the young men in such a way as to almost scapegoat them. The experience of the young men was marked by embarrassment and shame. They feel bullied and shamed by their families, peers and others in the community for not being able to find gender‐appropriate work.  相似文献   

Identity Production in Figured Worlds: How some Mexican Americans become Chicana/o Activist Educators   总被引：1，自引：0，他引：1  

Luis UrrietaJr. 《The Urban Review》2007,39(2):117-144

Using Holland, Lachicotte, Skinner, and Cain’s (1998) theory of identity and their concept of figured worlds, this article provides an overview of how twenty-four Mexican Americans came to produce Chicana/o Activist Educator identities. The desire to raise consciousness (teach for social justice pero con ganas) and “give back to the [their] community” became a very important part of this identity. Using an ethnographic interview as well as a life history interview methodology, this article specifically focuses on the participants’ conceptual and procedural identity production in local Chicana/o activist figured worlds (usually in colleges and universities). In these local figured worlds, the participants produced a more complex process of identity production that was both conceptual and procedural. The article concludes with broad implications for urban teacher education. Luis Urrieta, Jr. is assistant professor of cultural studies and education and Fellow in the Lee Hage Jamail Regents Chair in Education at the University of Texas at Austin. His research interests are in identity, agency, and social movements in education with a focus on Chicana/o and Indígena (P’urhépecha) education, citizenship and social studies education. 1 University Station D5700, Austin, TX 78712, USA.  相似文献