Assessing Fat Mass of Adolescent Swimmers Using Anthropometric Equations: A DXA Validation Study     

Gabriel Lozano-Berges  Alejandro Gómez-Bruton  Ángel Matute-Llorente  Cristina Julián-Almárcegui  Alba Gómez-Cabello  Alejandro González-Agüero 《Research quarterly for exercise and sport》2017,88(2):230-236

Purpose: The aim of the present study was to determine which of the published anthropometric equations is the most appropriate to estimate body-fat percentage (BF_%) in adolescent swimmers. Method: Eighty-eight swimmers (45 boys, 43 girls) participated in this study. Following the recommendations of the International Society of the Advancement of Kinanthropometry, biceps, triceps, subscapular, iliac-crest, supraspinale, front-thigh, and medial calf skinfold thicknesses were measured. Waist, hip, midthigh, calf, relaxed arm, and arm flexed and tensed girths were also registered. BF_% was measured with dual-energy X-ray absorptiometry (DXA) to obtain the reference value. Existing anthropometric equations were applied, and BF_% results obtained from anthropometric equations were compared to DXA BF_% results with the modified Bland-Altman. Results: The Flavel, Durnin-Rahaman-Siri, and Durnin-Rahaman-Brozek were the only equations that did not demonstrate statistically significant differences when compared with DXA. Conclusion: The present study showed that the best anthropometric equation from existing literature to estimate BF_% in swimmers is that proposed by Durnin-Rahaman (independently of applying the Siri or Brozek equation).  相似文献   

Some controls control too much     

Newcombe NS 《Child development》2003,74(4):1050-1052

Investigators of complex phenomena often seek to isolate variables of interest by statistical control. However, they run the risk of studying situations that do not exist in the real world, missing mediational links, and drawing incorrect policy conclusions. In the National Institute of Child Health and Human Development (NICHD) Early Child Care Research Network article in this issue, amount of time in child care was studied controlling for family income and maternal depression. However, use of child care is closely linked with maternal employment, which increases family income and decreases maternal depression, which in turn are linked to children's socioemotional adjustment. Hence, the negative effects of amount of time in child care reported in the article are likely overestimated relative to causal pathways in the lives of real families.  相似文献   

Spanish and English Early Literacy Profiles of Preschool Latino English Language Learner Children     

Jorge Gonzalez  Sharolyn Pollard-Durodola  Laura Saenz  Denise Soares  Heather Davis  Nora Resendez 《Early education and development》2016,27(4):513-531

Research Findings: The purpose of this study was to examine within-group individual differences in the code-related and oral language abilities of an economically stressed Spanish-speaking English language learner (ELL) preschool sample and to evaluate the predictive relationship of these differences to later listening comprehension. Latent class analysis was used to identify similarities in both the latent and outcome variables to form classes of students with similar profiles on the measured variables. Our 1st finding confirmed the existence of 4 distinct psychometrically validated profiles: (a) Low English Language, Average Spanish Language, Mixed Spanish Code-Related (prevalence 19.4%); (b) Average English Language, Strengths in Spanish Language and Spanish Code-Related (24.2%); (c) Mixed English and Spanish Language, Low Spanish Code-Related (prevalence 34%); and (d) High English Language, Average Spanish Language, Mixed Spanish Code-Related (prevalence 22%). The resulting profiles demonstrated that English and Spanish code- and language-related domains of emergent literacy developed unevenly across the Spanish-speaking ELL preschoolers. Relative strengths and weaknesses in code- and language-related skills were also found to be meaningfully related to end-of-year listening comprehension—a precursor to reading comprehension. Finally, profiles yielded meaningful variability along sociodemographic variables. Practice or Policy: Implications, limitations, and directions for future research are discussed.  相似文献   

Myth and ceremony in financial decision making under stress: Case studies from Mexican universities     

Nora H. Martinez 《Higher Education》1994,27(3):297-312

Based on case studies of a private and a public Mexican university, this research studied the economic strategies adopted by institutions of higher education to respond to financial stress. Rather than assuming that these strategies were selected primarily on the basis of their economic efficiency, the social processes that led to their adoption were explored.Economic development theory was employed to describe and conceptualize the universities' responses to financial difficulties. The concepts of institutional rules and rational myths in the environment and the processes that lead organizations to become similar to their environment were utilized to explore the role of the institutional environment on decision-making in times of fiscal uncertainty.Results indicate that financial stress was managed through economic measures, however the universities' institutional environment filtered and gave specific meaning to particular decision strategies. Institutional rules in the environment, acquiring the character of rationalized myths, pemeated and determined decision-making choices, and were evidenced in and sustained by mimetic, normative and coercive processes. In this light, the institutional environment pervaded and predicted rational decisions.  相似文献   

Successive negative contrast in the consummatory responding of didelphid marsupials     

Mauricio R. Papini  Alba E. Mustaca  M. E. Bitterman 《Learning & behavior》1988,16(1):53-57

In a consummatory experiment patterned after previous work with rats and goldfish, successive negative incentive contrast was sought in didelphid marsupials of two species (Lutreolina crassicaudata andDidelphis albiventris). Half of the subjects of each species were trained from the outset with a 32% sucrose solution and shifted occasionally to a 4% sucrose solution; the rest, which served as controls, were trained only with the 4% solution. The positive results obtained (less response to the 4% solution in the shifted subjects than in the controls) fit the hypothesis, based on comparative work with descendants of older vertebrate lines, that the mechanism of successive negative incentive contrast evolved in a common reptilian ancestor of birds and mammals.  相似文献   

The relationship of teachers' conceptions of mathematics and mathematics teaching to instructional practice   总被引：4，自引：0，他引：4  

Alba Gonzalez Thompson 《Educational Studies in Mathematics》1984,15(2):105-127

Case studies were conducted to investigate the conceptions of mathematics and mathematics teaching held by three junior high school teachers. Examination of the relationship between conceptions and practice showed that the teachers' beliefs, views, and preferences about mathematics and its teaching played a significant, albeit subtle, role in shaping their instructional behavior. Differences among the teachers in their conceptions and practices are explained followed by a discussion of properties of their conceptual systems.This paper is based on the author's doctoral dissertation which was directed by Professor Thomas J. Cooney of the University of Georgia and was partly supported by a grant from San Diego State University. I wish to express my appreciation to the teachers who participated in the study and their administrators.  相似文献   

Curriculum and Society: Rethinking the Link     

Alicia de Alba 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1999,27(4):431-443

This article argues that the link between educational curricula and society as a whole has become critically uncertain. This crisis is linked to a number of factors related to the post-modern world view, including: the disappearance of grand utopian social visions of the kind that used to underpin educational policy; the lack of adequate theoretical tools; and the way in which academics are exposed to a multitude of different cultural norms. The author argues that this situation calls for a fundamental re-thinking of the link between curriculum and society, based on a more flexible and pluralistic approach.  相似文献   

Determinants of retention among Chicano college students: A structural model     

Amaury Nora 《Research in higher education》1987,26(1):31-59

This study tested a modified version of Tinto's student attrition model on a Chicano student population in two-year colleges. Structural equation modeling and LISREL VI were used to examine the parameter estimates of the structural and measurement models of the hypothesized causal model. Measures of goodness of fit were examined to provide indices for the overall fit of the causal model in the study. The measurement and structural models were found to represent a plausible causal model of student retention among Chicano students. Although the measures used in assessing the fit of the model reflected the overall strength of the hypothesized model, the present study was not entirely supportive of Tinto's model. The findings were only minimally supportive of the hypothesized relationship between measures of academic integration and retention. The results indicated that the hypothesized relationship between measures of social integration could not be substantiated. Moreover, measures of initial commitments were found to have a significantly large direct effect on the dependent variable, retention.  相似文献   

Prevention of Targeted School Violence by Responding to Students' Psychosocial Crises: The NETWASS Program          下载免费PDF全文

Vincenz Leuschner  Nora Fiedler  Martin Schultze  Nadine Ahlig  Kristin Göbel  Friederike Sommer  Johanna Scholl  Dewey Cornell  Herbert Scheithauer 《Child development》2017,88(1):68-82

The standardized, indicated school‐based prevention program “Networks Against School Shootings” combines a threat assessment approach with a general model of prevention of emergency situations in schools through early intervention in student psychosocial crises and training teachers to recognize warning signs of targeted school violence. An evaluation study in 98 German schools with 3,473 school staff participants (M_age = 46.2 years) used a quasi‐experimental comparison group design with three measurement points (pre, post, and 7 months followup) with schools randomly allocated to implementation conditions. The study found increases in teachers' expertise and evaluation skills, enhanced abilities to identify students experiencing a psychosocial crisis, and positive secondary effects (e.g., teacher–student interaction, feelings of safety).  相似文献   

Legal implications of divorce and custody battles for day care administrators     

Nora Palmer Gould 《Early Childhood Education Journal》1987,15(2):14-17

The moment is tense ... and somewhat confusing. I am in my office with a small group of five-year-olds reading a story when Mrs. Wilson arrives. She is young, pretty, and looking very serious. “Billy says that his father visited here today!”  相似文献