Association of different types of playing surfaces with bone mass in growing girls     

Esther Ubago-Guisado  Jorge García-Unanue  Jorge López-Fernández  Javier Sánchez-Sánchez  Leonor Gallardo 《Journal of sports sciences》2017,35(15):1484-1492

The aim of this cross-sectional study was to compare bone mass in young female athletes playing ball games on different types of playing surfaces. About 120 girls, 9–13 years of age (10.6 ± 1.5 years old Tanner I–III) were recruited and divided into prepubertal and pubertal groups. The sample represented 3 groups of athletes: soccer (N = 40), basketball (N = 40), and handball (N = 40); and 6 different playing surfaces (soccer – ground, soccer – artificial turf, basketball – synthetic, basketball – parquet, handball – synthetic, and handball – smooth concrete). Total and regional body composition (bone mass, fat mass, and lean mass) were measured by dual-energy X-ray absorptiometry (DXA). The mechanical properties of the surfaces (force reduction, vertical deformation, and energy return) were measured with the Advanced Artificial Athlete (Triple A) method. The degree of sexual development was determined using Tanner test. The pubertal group showed that soccer players on the ground, basketball players on synthetic, and handball players on smooth concrete had higher values of bone mineral content (BMC) and bone mineral density (BMD) (P < 0.05) than the soccer players on the artificial turf, basketball players on parquet, and handball players on synthetic. In conclusion, a hard playing surface, with less vertical deformation and force reduction, and greater energy return, is associated with higher levels of BMD and BMC in growing girls, regardless of the sport they practice.  相似文献   

Advancing our understanding of understanding     

Xavier de Donato Rodríguez 《Metascience》2015,24(3):497-502

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Language Acquisition Assisted by the Internet     

Judit Hajnal  Gábor Veress  László Magulya 《Educational Media International》2013,50(4):176-181

Abstract

The authors focus on exploiting new methods of language acquisition with the help of the possibilities offered by the Internet. As a new option for computer‐assisted language learning, the Internet is considered to be a source for individual learning and problem oriented teaching in many other areas. Expanding knowledge in parallel in informatics and the English language is an asset. In addition to pointing out starting off sites for ESL teachers and introducing some interesting examples, some criteria of constructing language teaching WWW pages of our own are also listed.  相似文献   

Differing Roles,Differing Concerns: Using Network Analysis as a Tool to Highlight Diverging Concerns and Priorities Surrounding Teacher Education at Minority-Serving Institutions     

Dorothy Villarreal  Manuel González Canché  Andrés Castro Samayoa  Alice Ginsberg 《The Teacher Educator》2013,48(4):446-459

Abstract

Minority-serving institutions are important in the production of teachers of color. However, this formative process is not without limitations. This multisite, multistate study relied on network analysis techniques to unveil timely and relevant concerns that students, faculty, and administrators identified as critical toward the strengthening of teacher production.  相似文献   

How can pre-service primary teachers' perspectives contribute to a pedagogy that problematises the ‘practical’ in teacher education?     

Déirdre Ní Chróinín  Ailbhe Kenny  Elaine Murtagh  Elaine Vaughan 《Irish Educational Studies》2013,32(2):251-267

This study examined pre-service primary teachers' perspectives on teaching and learning experiences within college-based courses in ‘practical’ subject areas within a teacher education programme. Following three individual lectures (one each in art, music and physical education), pre-service teachers (n=11) participated in focus group interviews sharing their perspectives on the teaching and learning experiences. These data were analysed thematically and supported by teacher educators' (n=3) planning and reflection documentation. Although the problematic nature of the ‘practical’ suggests appeal and peril of the ‘practical’, the important nature of negotiating the ‘practical’ to enhance student learning is apparent. Students emphasised the value of practical engagement and expressed a strong preference for working in groups to create a safe learning environment to develop confidence and competence. These insights suggest key aspects of a pedagogy of teacher education in these ‘practical’ areas. The importance of being aware of and, in some cases, challenging student perspectives on how they learn best in these curricular areas is discussed.  相似文献   

Does Bradford's Law of Scattering predict the size of the literature in Cochrane Reviews?     

Charlotte E Nash-Stewart  Lisa M Kruesi  Chris B Del Mar 《Journal of the Medical Library Association》2012,100(2):135-138

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Assessing working students' college experiences: a grounded theory approach     

David X. Cheng  Lucia Alcántara 《Assessment & Evaluation in Higher Education》2007,32(3):301-311

This study explores working students' college experiences using the grounded theory approach. Focus groups were conducted to allow working students to elaborate on their college experiences, clarifying issues not easily addressed through surveys. Two theoretical propositions are offered to describe how working students are constantly searching for meaningful work as well as meaning in their work. It is important for institutions to consider work as an educationally purposeful activity outside classroom and to create job opportunities that benefit students academically, socially and financially.  相似文献   

Integrating Art Education Models: Contemporary Controversies in Spain     

Manuel Belver  Ana Ulln  María Acaso 《The International Journal of Art & Design Education》2005,24(1):93-99

In this article, a basic controversy for art education in Spain is analysed, and its antecedents in thought and social and artistic practices are reviewed. The controversy refers to the question whether school art education should be oriented towards the fine arts or towards the manual arts. Consequently, which should be the cultural model of reference in contemporary art education? These two controversies are considered as two dimensions whose poles have, to a certain extent, the capacity to articulate various educational trends. The values associated with each pole of each dimension are discussed: for the first dimension, creativity, originality, self‐efficacy and the value of accomplished work; for the second, increase of cultural capital and intercultural solidarity. Finally, the possibility is considered of elaborating educational models that would integrate the various mentioned educative values. The question is raised of the compatibility of these educational values, and it is pointed out that art education has the capacity to generate educational spaces of interchange and dialogue in which to combine languages and perspectives that can contribute to human development and to the mutual coexistence of social groups.  相似文献   

Biomechanical characteristics of adults walking forward and backward in water at different stride frequencies     

Cristina Cadenas-Sánchez  Raúl Arellano  Sonia Taladriz  Gracia López-Contreras 《Journal of sports sciences》2016,34(3):224-231

The aim of this study was to examine spatiotemporal characteristics and joint angles during forward and backward walking in water at low and high stride frequency. Eight healthy adults (22.1 ± 1.1 years) walked forward and backward underwater at low (50 pulses) and high frequency (80 pulses) at the xiphoid process level with arms crossed at the chest. The main differences observed were that the participants presented a greater speed (0.58 vs. 0.85 m/s) and more asymmetry of the step length (1.24 vs. 1.48) at high frequency whilst the stride and step length (0.84 vs. 0.7 m and 0.43 vs. 0.35 m, respectively) were lower compared to low frequency (P < 0.05). Support phase duration was higher at forward walking than backward walking (61.2 vs. 59.0%). At initial contact, we showed that during forward walking, the ankle and hip presented more flexion than during backward walking (ankle: 84.0 vs. 91.8º and hip: 22.8 vs. 8.0º; P < 0.001). At final stance, the knee and hip were more flexed at low frequency than at high frequency (knee: 150.0 vs. 157.0º and hip: ?12.2 vs. –14.5º; P < 0.001). The knee angle showed more flexion at forward walking (134.0º) than backward walking (173.1º) (P < 0.001). In conclusion, these results show how forward and backward walking in water at different frequencies differ and contribute to a better understanding of this activity in training and rehabilitation.  相似文献   

Beyond Things: The Ontological Importance of Play According to Eugen Fink     

Jan Halák 《体育哲学杂志》2016,43(2):199-214

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