Anthropometric, physiological, performance, and nutritional profile of the Brazil National Canoe Polo Team     

Alves CR  Pasqua L  Artioli GG  Roschel H  Solis M  Tobias G  Klansener C  Bertuzzi R  Franchini E  Lancha Junior AH  Gualano B 《Journal of sports sciences》2012,30(3):305-311

The purpose of this study was to determine the physiological, anthropometric, performance, and nutritional characteristics of the Brazil Canoe Polo National Team. Ten male canoe polo athletes (age 26.7 ± 4.1 years) performed a battery of tests including assessments of anthropometric parameters, upper-body anaerobic power (Wingate), muscular strength, aerobic power, and nutritional profile. In addition, we characterized heart rate and plasma lactate responses and the temporal pattern of the effort/recovery during a simulated canoe polo match. The main results are as follows: body fat, 12.3 ± 4.0%; upper-body peak and mean power, 6.8 ± 0.5 and 4.7 ± 0.4 W · kg(-1), respectively; 1-RM bench press, 99.1 ± 11.7 kg; peak oxygen uptake, 44.3 ± 5.8 mL · kg(-1) · min(-1); total energy intake, 42.8 ± 8.6 kcal · kg(-1); protein, carbohydrate, and fat intakes, 1.9 ± 0.1, 5.0 ± 1.5, and 1.7 ± 0.4 g · kg(-1), respectively; mean heart rate, 146 ± 11 beats · min(-1); plasma lactate, 5.7 ± 3.8 mmol · L(-1) at half-time and 4.6 ± 2.2 mmol · L(-1) at the end of the match; effort time (relative to total match time), 93.1 ± 3.0%; number of sprints, 9.6 ± 4.4. The results of this study will assist coaches, trainers, and nutritionists in developing more adequate training programmes and dietary interventions for canoe polo athletes.  相似文献   

Anti-collusion indices and averages for the evaluation of performances and judges     

Gambarelli G  Iaquinta G  Piazza M 《Journal of sports sciences》2012,30(4):411-417

In subjectively assessed artistic sports, judges sometimes collude. To avoid this, Federations adopt various strategies in their regulations. However, it is evident that these methods are often not sufficient to overcome collusions completely. The problem is especially difficult in cases where the judging panel consists of sub-commissions that deal with particular aspects of each performance and the scores of each sub-commission are summarized as mean values, which, in turn, are combined into a final mark. Therefore, the formulation of anti-collusion indices would be useful to assess judges and take account of such scores, rejecting the less reliable ones. An anti-collusion index and related average, recently introduced, can be applied in fields other than sports. This article presents some useful considerations for the application of such instruments to the field of sport.  相似文献   

Standardizing chaos: a neo‐institutional analysis of the INEE Minimum Standards for Education in Emergencies,Chronic Crises and Early Reconstruction     

Patricia Bromley  Marina Andina 《Compare》2010,40(5):575-588

Violent conflict and humanitarian disasters such as floods, famines, or tsunamis, have existed since the start of human history. However, it is only recently that education in these emergency situations has emerged as a visible organizational field. We aim to use a unique theoretical application of sociological neo‐institutionalism to explain the rapid and recent rise of emergency education as a professional field, focusing specifically on the creation of global standards called the INEE Minimum Standards for Education in Emergencies, Chronic Crises and Early Reconstruction. We argue that international standards in emergency education arise due to the institutionalization of education as a human right and rationalization of approaches to solving social problems. A key implication of our argument is that decoupling between formal standards and on‐the‐ground practice is likely to be endemic, lessening the day‐to‐day utility of the standards. However, the creation of international standards and an organizational field of emergency education professionals may provide long‐term benefits by contributing to the re‐definition of humanitarian intervention to include education.  相似文献   

Articulation of Conceptual Knowledge and Argumentation Practices by High School Students in Evolution Problems     

Marina de Lima Tavares  María-Pilar Jiménez-Aleixandre  Eduardo F. Mortimer 《Science & Education》2010,19(6-8):573-598

The oral arguments of 12th grade students while solving tasks related to evolution are examined. Two groups (N = 45), taught by the same teacher, were studied during a complete teaching sequence. The paper focuses on data from the last sessions, devoted to solving problems in small groups, problems related to different dimensions of the evolutionary model. Data include video recordings, the students’ written productions and the researcher (first author) field notes. The objective is to examine the process of articulation of students’ argumentation practices with their use of evolutionary models. The results show that participants were able to apply notions such as common ancestors, radiation, or gradualism to different contexts. The arguments required the articulation of evolution notions with argumentative practices as coordinating evidence with claims at different epistemic levels. The influence of the teacher’s strategies in the students’ role is discussed.  相似文献   

Disclosure to Parents About Everyday Activities Among American Adolescents From Mexican, Chinese, and European Backgrounds     

Jenny P. Yau  Marina Tasopoulos-Chan  Judith G. Smetana 《Child development》2009,80(5):1481-1498

Disclosure to parents and reasons for not disclosing different activities were examined in 489 Chinese, Mexican, and European American adolescents ( M  =   16.37 years, SD  =   0.77). With generational status controlled, Chinese American adolescents disclosed less to mothers about personal and multifaceted activities than European Americans and less about personal feelings than other youth, primarily because these acts were considered personal, not harmful, or because parents would not listen or understand. Disclosure regarding prudential behavior was lower among Mexican American than among European American adolescents, primarily due to concerns with parental disapproval. Multigroup path analyses indicated that greater closeness to parents is associated with more disclosure for all youth and activities; associations between family obligation and disclosure varied by domain and ethnicity.  相似文献   

A systematic analysis of performance measures for classification tasks     

Marina Sokolova  Guy Lapalme 《Information processing & management》2009

This paper presents a systematic analysis of twenty four performance measures used in the complete spectrum of Machine Learning classification tasks, i.e., binary, multi-class, multi-labelled, and hierarchical. For each classification task, the study relates a set of changes in a confusion matrix to specific characteristics of data. Then the analysis concentrates on the type of changes to a confusion matrix that do not change a measure, therefore, preserve a classifier’s evaluation (measure invariance). The result is the measure invariance taxonomy with respect to all relevant label distribution changes in a classification problem. This formal analysis is supported by examples of applications where invariance properties of measures lead to a more reliable evaluation of classifiers. Text classification supplements the discussion with several case studies.  相似文献   

Teaching Partnerships: Early Childhood and Engineering Students Teaching Math and Science Through Robotics   总被引：1，自引：1，他引：0  

Marina?U.?BersEmail author  Merredith?Portsmore 《Journal of Science Education and Technology》2005,14(1):59-73

This paper presents an innovative approach to introducing pre-service early childhood teachers to math, science and technology education. The approach involves the creation of partnerships between pre-service early childhood and engineering students to conceive, develop, implement and evaluate curriculum in the area of math, science and technology by using robotics and the engineering design process. In this paper we first present the theoretical framework for the creation of these partnerships. We then introduce an experience done at Tufts University in which three different forms of partnership models evolved: the collaborators model, the external consultants model and the developers model. We also present different case studies from this experience and finally we conclude with some remarks and observations for making this work scalable and sustainable in other settings and universities.  相似文献   

Are the seeds of violence sown in schools?     

Marina Camargo Abello 《Prospects》1997,27(3):446-465

  相似文献   

Identification of visual dimensions in photographs using multidimensional scaling techniques     

Marina Stock Mclsaac  Mary Lou Mosley  Naomi Story 《Educational technology research and development : ETR & D》1984,32(3):169-179

An examination of underlying visual dimensions commonly perceived in photographs was conducted using multidimensional scaling techniques. Fifteen male and female university graduate students individually examined 34 photographs chosen to represent a broad range of visual topics. Similarity judgments between photographs were used for multidimensional scaling, while subject interview data were used to describe meaningful visual concepts. Results indicate that pictures were grouped in clusters along three observable dimensions. Life, nature, and culture emerged as the dimensions of primary importance to viewers. This suggests the existence of universal meaning systems in visuals for communicating denotative and connotative meaning and presents experimental variables for future hypothesis testing. We gratefully acknowledge David Lancy’s inspiration and Ed Greenberg’s significant contribution to this work.  相似文献   

Spatial Ability Mediates the Gender Difference in Middle School Students' Science Performance     

Colleen M. Ganley  Marina Vasilyeva  Alana Dulaney 《Child development》2014,85(4):1419-1432

Prior research has demonstrated a male advantage in spatial skills and science achievement. The present research integrated these findings by testing the potential role of spatial skills in gender differences in the science performance of eighth‐grade students (13–15 years old). In 2 (N = 113), the findings showed that mental rotation ability mediated gender differences in physical science and technology/engineering test scores. In 3 (N = 73,245), science performance was examined in a state population of eighth‐grade students. As in 2 , the results revealed larger gender differences on items that showed higher correlations with mental rotation. These findings underscore the importance of considering spatial training interventions aimed at reducing gender differences in the science performance of school‐aged children.  相似文献