Are the new starting block facilities beneficial for backstroke start performance?     

Karla de Jesus  Kelly de Jesus  J. Arturo Abraldes  Alexandre Igor Araripe Medeiros  Ricardo J. Fernandes  João Paulo Vilas-Boas 《Journal of sports sciences》2016,34(9):871-877

We aimed to analyse the handgrip positioning and the wedge effects on the backstroke start performance and technique. Ten swimmers completed randomly eight 15 m backstroke starts (four with hands on highest horizontal and four on vertical handgrip) performed with and without wedge. One surface and one underwater camera recorded kinematic data. Standardised mean difference (SMD) and 95% confidence intervals (CI) were used. Handgrip positioning did not affect kinematics with and without wedge use. Handgrips horizontally positioned and feet over wedge displayed greater knee angular velocity than without it (SMD = ?0.82; 95% CI: ?1.56, ?0.08). Hands vertically positioned and feet over wedge presented greater take-off angle (SMD = ?0.81; 95% CI: ?1.55, ?0.07), centre of mass (CM) vertical positioning at first water contact (SMD = ?0.97; 95% CI: ?1.87, ?0.07) and CM vertical velocity at CM immersion (SMD = 1.03; 95% CI: 0.08, 1.98) when comparing without wedge use. Swimmers extended the hip previous to the knee and ankle joints, except for the variant with hands vertically positioned without wedge (SMD = 0.75; 95% CI: ?0.03, 1.53). Swimmers should preserve biomechanical advantages achieved during flight with variant with hands vertically positioned and wedge throughout entry and underwater phase.  相似文献   

Feasibility and students' preliminary views on parkour in a group of primary school children     

Javier Fernández-Río  Carlos Suarez 《Physical Education & Sport Pedagogy》2016,21(3):281-294

Background: Adventure education is an instructional model where students participate in adventurous activities to acquire physical, cognitive, and affective skills. It also has strong connections with cooperative learning. Parkour is a fast-growing sport practiced by thousands of youngsters all over the world. The media does not portray it as an educational content, but resourcefulness, maturity, cooperation, and respect are among its basic principles. It also appears to have a direct connection with risk-taking, self-discipline, and autonomy.

Purpose: The purpose of this paper is to assess students' ideas, views, and/or feelings after experiencing a parkour learning unit.

Participants and settings: The research project was conducted in an intact, sixth-grade physical education class in an elementary school located in the northern part of Spain. A total of 26 students with ages ranging between 11 and 12 years (mean age 11.4?±?0.6) participated in the study. There were 14 boys and 12 girls.

Data collection: At the end of the intervention programme, all participating students were asked to ‘Describe your feelings, your thoughts, and your ideas on the parkour learning unit that you just experience in physical education'.

Data analysis: MAXQDA 11, a qualitative software package, was used to assist with data management. All participants' answers were analysed via thematic content analysis and constant comparison.

Findings: Five major categories emerged from data analysis: enjoyment, fear, social skills, problem-solving skills, and integration. Our findings agree with previous researchers who believe that parkour could be considered an educational content due to all the different positive outcomes that it brings to the physical education class. It seems to promote the development of social and problem-solving skills in the students. Both are competences that should be encouraged and fostered in our youngsters. Furthermore, it is considered a fun activity, it promotes students' integration, and it teaches them how to cope with fear.

Conclusion: In contrast to popular views portrayed by the media, the sport of parkour can be a safe, educational content. School cannot turn its back on sports or contents whose popularity is rapidly increasing.  相似文献   

Unveiling the Colours of Cellulose Nitrate Black and White Film-based Negatives in Colonial Photography     

Élia Roldão  A. Jorge Parola  Márcia Vilarigues  Bertrand Lavédrine 《文物保护研究》2020,65(2):118-126

ABSTRACT

Aiming at contributing to the preservation of black and white (B&W) film-based negatives held by Portuguese archives, four photographic collections from the first half of the twentieth century were selected for study. During the macro assessment of the collections the preservation condition and hues found in photographic negatives from the Elmano Cunha e Costa (ECC) were noticed, distinguishing this collection from the remaining ones. Additional attention was given considering that the ECC collection was formed in a colonial context in the 1930s, while the others were formed on the Portugal mainland. The ECC collection results from an ethnographic survey of Angolan tribes recorded with B&W film-based negatives. In this collection, sets of negatives with pink, lemon yellow, greenish, orange brownish, and red brownish hues were found. To identify the origin of such hues, the image layer was analysed by microscale energy-dispersive X-ray fluorescence (μ EDXRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). Additionally, to assess the base decay and its effect on the formation of hues, the plastic supports were characterized by Fourier transform infrared microscopy (μ FTIR). To complement the assessment of the film-base decay, pH was measured by using combined microelectrodes. The identification of mercury, iodine, chromium, and iron by μ EDXRF allowed correlation of the hues found in the negatives with chemical corrective treatments performed to improve the image quality. SEM-EDX confirmed those results and proved that the elements found were in the photographic emulsion layer. The results obtained are relevant since the hues identified may now be used as markers to indicate the technical work performed on colonial photography. Additionally, the visual and molecular assessment of the negatives’ supports (good to fair condition) allow proposing that the original storage conditions may have had a beneficial contribution to their present condition.  相似文献   

Socio‐scientific controversies and students' conceptions about scientists     

Cecília Galvão 《International Journal of Science Education》2013,35(13):1621-1633

This article discusses the results of a mainly qualitative study into possible impacts of recent controversial socio‐scientific issues on a group of Portuguese secondary school students regarding their conceptions about scientists. The 86 participants: (1) answered a questionnaire with open‐ended questions; and (2) wrote a science fiction story involving a group of scientists working on a particular situation of her/his choice. Next, semi‐structured interviews were carried out to clarify and discuss the ideas embodied in the stories and mentioned in the questionnaire. All data underwent a process of content analysis. The socio‐scientific controversies recently discussed, and the way science and scientists are depicted in the media, seem to have produced some impact on students' conceptions about scientists. Based on the results obtained, some remarks and educational implications are discussed.  相似文献   

Insights into user engagement on social media. Case study of a higher education institution     

María del Rocío Bonilla  Eva Perea  August Corrons 《Journal of Marketing for HIGHER EDUCATION》2020,30(1):145-160

ABSTRACT

The interactions of users in social networks have been analyzed in the literature as sources of information on their ability to generate engagement among stakeholders in higher education institutes, which make more tactical than strategic use of social networks. This study helps identify which variables generate greater participation in Instagram users, providing strategic proposals for digital marketing. From the codification of all the publications published by a university in a social network site during the period of one year, a comparative analysis was carried out through a multivariate model. The results provide important and timely implications for both universities and higher education professionals. Our findings suggest that higher education marketing specialists should develop stronger and more consistent communication strategies to establish more valuable relationships with stakeholders. The administrators of the social networks of higher education institutions can find patterns in those publications that generate a greater participation in this study.  相似文献   

Specific Learning Disabilities and the Portuguese Educational System     

Luís de Miranda Correia  Ana Paula Louo Martins 《Learning disabilities research & practice》2007,22(3):189-195

Although the Portuguese educational system advocates the accommodation of all students in regular schools, it has not adopted a coherent discourse that would contribute to meeting effectively the needs of students with specific learning disabilities (SLD). As such, the successive reorganizations of special education have resulted in uninformed decisions that have caused the education of students with SLD in Portugal to be, in many instances, detrimental to their academic and social growth. We describe the reality of SLD in Portugal, considering four main topics: (1) the establishment of the SLD concept, (2) the birth of a Portuguese definition of SLD, (3) the context of educational policy, and (4) the provision for students with SLD.  相似文献   

Does moderate-intensity continuous training result in greater total energy expenditure compared to high-intensity interval training?     

Leonardo Vidal Andreato  Braulio Henrique Magnani Branco  João Victor Esteves 《Journal of sports sciences》2019,37(11):1314-1315

Recently in the Journal of Sports Sciences, Schaun et al. published a study on the comparison of energy expenditure between high-intensity interval training and moderate continuous training performed in water. With this Letter to the Editor, we would like to comment on the methodological aspects that should be considered to analyze the results presented, as well as the conclusions.

Abbreviations: CONT, moderate-intensity continuous training; EPOC, excess post-exercise oxygen consumption; HIIT, high-intensity interval training; VO2max, maximal oxygen consumption.  相似文献   

Early childhood policies in low- and middle-income countries     

Michelle J. Neuman  Lynette Okeng’o 《Early Years: An International Journal of Research and Development》2019,39(3):223-228

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Key components of learning ecologies: A Delphi assessment     

Mercedes González-Sanmamed  Pablo-César Muñoz-Carril  Francisco-José Santos-Caamaño 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(4):1639-1655

The educational landscape has changed in recent years, requiring reflection about new pedagogical methods and theories. There are three important perspectives as drivers of pedagogical reflection: lifelong and life-wide learning, the idea of learning as a social construct in which internal elements and changing external factors converge, and the recognition of technology as a resource that can promote ubiquitous and expanded learning. Learning ecology has been proposed as a conceptual and empirical framework, but its still emergent nature along with its multidimensionality and complexity require further exploration. The Delphi study we present as part of a broader research project aims to identify the components of learning ecologies. Three panel rounds with international experts were carried out, after which two important dimensions emerged in the structure of learning ecologies. The first is related to intrinsic “learning dispositions,” which is made up of three categories: the subject's ideas about learning, their motivations and expectations. The second dimension, called “learning processes,” comprises four components: relationships, resources, actions and context. The identification of the components of learning ecologies and their influence on formal, non-formal and informal training processes will provide guidance for educational policies and help to better organize training programmes.  相似文献   

How to promote conservation behaviours: the combined role of environmental education and commitment     

Raquel Barata  Paula Castro  Maria Amélia Martins-Loução 《Environmental Education Research》2017,23(9):1322-1334

This study tested the influence of both environmental education (EE) and commitment interventions among teenagers for promoting energy and water conservation at home. Conservation behaviours were measured in two ways – directly and through questionnaires – prior to and after the interventions. Results indicate (1) EE participants may have saved more energy than non-participants and (2) those signing a public commitment saved more energy and water than those who did not. Results from the questionnaire measures demonstrated the importance of EE for promoting ecological self-identity and a personal norm for energy conservation. Based on these results the use of commitment interventions in EE initiatives for promoting conservation behaviours among teenagers is proposed.  相似文献