The impact of different types of physical activity on total and regional bone mineral density in young Brazilian athletes     

Silva CC  Goldberg TB  Teixeira AS  Dalmas JC 《Journal of sports sciences》2011,29(3):227-234

Bone turnover is affected by exercise throughout the lifespan, especially during childhood and adolescence. The objective of this study was to investigate the impact of different sports on total and regional bone mineral density in male Brazilian adolescent athletes. Forty-six adolescents aged 10-18 years participated in the study: 12 swimmers, 10 tennis players, 10 soccer players, and 14 sedentary individuals. The athletes had engaged in physical activities for more than 10 h per week in the previous 6 months. Bone mineral density of the lumbar spine (L1-L4), left proximal femur region, and whole body was evaluated by dual-energy X-ray absorptiometry. Results showed higher mean values in the proximal femur region of tennis and soccer players (1.02 ± 0.18; 0.96 ± 0.16, respectively) than swimmers and controls (0.91 ± 0.14 and 0.87 ± 0.06, respectively) (P < 0.05). In relation to the impact of sporting activities based on bone age determination, we observed significant differences in bone mineral density at all evaluated sites at the end of puberty (16-18 years) compared with 10-12 years, with increases of 78% in the lumbar spine, 47% in the proximal femur, and 38% in the whole body.  相似文献   

The relationship between work conditions and perceptions of organizational justice among library employees     

Miriam L. Matteson  Yue Ming  David E. Silva 《Library & information science research》2021,43(2):101093

Library employees hold perceptions about the fairness of the outcomes, processes, and interpersonal treatment in their workplaces. When employees feel the workplace is fair they are more likely to feel commitment to the organization, perform in-role and extra-role tasks, and experience job satisfaction. When employees perceive injustice in the workplace, research points to negative outcomes such as withholding work or even sabotage. To understand the antecedents of organizational justice, researchers carried out a national survey of librarians to compare the predictive power of perceived organizational support, job autonomy, job feedback, and job stress. Results indicate that increasing librarians' perceptions of organizational support and their autonomy, and providing meaningful and timely job feedback can increase overall perceptions of justice. Managers can enhance a climate of justice in their workplaces by developing strategies that target organization support, autonomy, and feedback to reduce a sense of injustice between and among employees.  相似文献   

“I Managed It Pretty Good”: Birth Narratives of Adolescent Mothers     

Tracy R. Nichols  Margaret Brown  Sheryl L. Coley  Allyson Kelley  Kelly Mauceri 《The Journal of perinatal education》2014,23(2):79-88

The aim of this study was to understand adolescent mothers’ childbirth experiences. Semistructured interviews were conducted with participants recruited from a community-based program for adolescent mothers. Fourteen mothers described their birth experiences. Using a narrative analytic approach, responses were reconstructed into birth stories. Stories, condensed into poetic form, were compared and contrasted. Four unique categories emerged: connected births, surreal births, disconnected births, and disempowered births. Categories differed by agency, support, and emotional tone. Positive support was found in stories that portrayed high agency and positive affect, whereas problematic support was apparent in stories that conveyed passivity, frustration, and disappointment. This study has implications for tailoring childbirth education for adolescent mothers and can inform health-care professionals working with this population.  相似文献   

Promoting Inquiry-Based Teaching in Laboratory Courses: Are We Meeting the Grade?     

Christopher Beck  Amy Butler  Karen Burke da Silva 《CBE life sciences education》2014,13(3):444-452

Over the past decade, repeated calls have been made to incorporate more active teaching and learning in undergraduate biology courses. The emphasis on inquiry-based teaching is especially important in laboratory courses, as these are the courses in which students are applying the process of science. To determine the current state of research on inquiry-based teaching in undergraduate biology laboratory courses, we reviewed the recent published literature on inquiry-based exercises. The majority of studies in our data set were in the subdisciplines of biochemistry, cell biology, developmental biology, genetics, and molecular biology. In addition, most exercises were guided inquiry, rather than open ended or research based. Almost 75% of the studies included assessment data, with two-thirds of these studies including multiple types of assessment data. However, few exercises were assessed in multiple courses or at multiple institutions. Furthermore, assessments were rarely based on published instruments. Although the results of the studies in our data set show a positive effect of inquiry-based teaching in biology laboratory courses on student learning gains, research that uses the same instrument across a range of courses and institutions is needed to determine whether these results can be generalized.  相似文献   

Predictors of developmentally appropriate classroom practices in kindergarten through third grade   总被引：2，自引：0，他引：2  

Kelly L. Maxwell  R. A. McWilliam  Mary Louise Hemmeter  Melinda Jones Ault  John W. Schuster 《Early childhood research quarterly》2001,16(4)

This study was designed to (a) test the psychometric properties of a new observation measure of developmentally appropriate classroom practices in kindergarten through third-grade classrooms, and (b) determine how well classroom and teacher characteristics predict developmentally appropriate classroom practices. Teacher-reported and observational data from 69 classrooms provided support for construct validity, internal consistency, and interrater agreement of the Assessment of Practices in Early Elementary Classrooms (APEEC) measure. Hierarchical multiple regression analyses indicated that classroom characteristics (grade, class size, number of children with disabilities), teacher characteristics (education level, years of experience) and teacher beliefs (developmentally appropriate beliefs and developmentally inappropriate beliefs) accounted for 42% of the variance in observed classroom practices. With all variables in the model, teacher education, grade, and beliefs in developmentally appropriate and inappropriate practice accounted for most of the variance in observed classroom practices.  相似文献   

Creating a Web-accessible,point-of-care,team-based information system (PoinTIS): the librarian as publisher     

Suzetta C. Burrows  Kelly M. Moore  Henry L. Lemkau  Jr. 《Journal of the Medical Library Association》2001,89(2):154-164

The Internet has created new opportunities for librarians to develop information systems that are readily accessible at the point of care. This paper describes the multiyear process used to justify, fund, design, develop, promote, and evaluate a rehabilitation prototype of a point-of-care, team-based information system (PoinTIS) and train health care providers to use this prototype for their spinal cord injury and traumatic brain injury patient care and education activities. PoinTIS is a successful model for librarians in the twenty-first century to serve as publishers of information created or used by their parent organizations and to respond to the opportunities for information dissemination provided by recent technological advances.  相似文献   

The Ethnic Garden in Portuguese‐American Writing     

Reinaldo Silva 《Journal of American culture (Malden, Mass. : 2003)》2005,28(2):191-200

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Literacy for All: a Consideration of the Many Opportunities for Language Acquisition     

Carole Silva 《Literacy》1997,31(2):36-37

There are lots of opportunities in a classroom day for the development of literacy. Reading aloud to children is one of the most important of these. Carole Silva here reminds us of the potential of this activity and gives several practical suggestions for working with children.  相似文献   

Distinction through visual art     

Dr Elizabeth B. Silva 《Cultural Trends》2006,15(2-3):141-158

Visual art is one of the fields where, according to Bourdieu, culture is used to reproduce the class structure. Like other items in the cultural repertoire, paintings, as major examples of visual art, imply social divisions in how they are engaged with by artists, critics and audiences. Within the Bourdieusian framework, cultural engagements with paintings are interpreted as indicators of social position, since appreciation depends on a trained capacity in the family and the educational system, which is often inaccessible to less powerful sections of the population. This would imply that the sorts of paintings favoured by working-class people differ from those preferred by the middle or upper classes. More recent studies have contested the view that a gulf exists between the art tastes of different classes in ways that reproduce the class structure. The argument of the omnivore thesis that distinctions between more popular and legitimate tastes have become blurred has predominantly been based on empirical references in the field of music. This article explores this thesis on the basis of data about visual arts in the Cultural Capital and Social Exclusion project. While some differences continue to be connected to social divisions of income, education and occupational groups, important similarities are found across the board, and certain significant differences appear to relate to factors other than social class, such as ethnicity, age and gender. It is also significant that some people appear disconnected from and disinterested in paintings.  相似文献   

Technology at Washington University School of Medicine Library: BACS, PHILSOM, and OCTANET     

S Crawford  M F Johnson  E A Kelly 《Bulletin of the Medical Library Association》1983,71(3):324-327

A brief overview of the Bibliographic Access and Control System developed by the Washington University School of Medicine Library is presented. Because the system has been described in two previous reports, this paper focuses on its relationship to other automated programs (i.e., PHILSOM and OCTANET), education of users, evaluation of the system, and outreach to the medical center. In operation for more than two years, BACS represents the computerization of much of the managerial and operational functions of the library, and marks the completion of stage 1 of the three stages of library evolution described in the AAMC report Academic Information in the Academic Health Sciences Center: Roles for the Library in Information Management.  相似文献