The exercise intensity at maximal oxygen uptake (i⩒O2max): Methodological issues and repeatability

The minimum exercise intensity that elicits ?O_2max (i?O_2max) is an important variable associated with endurance exercise performance. i?O_2max is usually determined during a maximal incremental exercise test; however, the magnitude and duration of the increments used influence the i?O_2max value produced by a given test. The aims of this study were twofold. The first was to investigate whether the i?O_2max value produced by a single cycle ergometer test (i?O_2max(S)) was repeatable. The second was to determine if i?O_2max(S) represents the minimum intensity at which ?O_2max is elicited when compared to a refined i?O_2max value (i?O_2max(R)) derived from repeated tests. Seventeen male cyclists (age 33.9?±?7.7 years, body mass 80.9?±?10.2?kg, height 1.82?±?0.05?m; VO_2max 4.27?±?0.62 L?min^?1) performed four maximal incremental tests for the determination of i?O_2max(S) and i?O_2max(R) (3 min stages; 20?W increments). Trials 1 and 2 were identical and used for assessing the repeatability of i?O_2max(S), trials 3 and 4 began at different intensities and were used to determine i?O_2max(R). i?O_2max(S) showed good test–retest repeatability for i?O_2max (CV?=?4.1%; ICC?=?0.93), VO_2max (CV?=?6.3%; ICC?=?0.88) and test duration (CV?=?6.7%; ICC?=?0.89). There was no significant difference between i?O_2max(S) and i?O_2max(R) (303?±?40?W vs. 301?±?42?W) (P?2max determined directly during a maximal incremental test is repeatable and provides a very good estimate of the minimum exercise intensity that elicits ?O_2max.     

Associations between anxiety,self-efficacy,and outcomes by gender and body size dissatisfaction during fitness in high school physical education

Background: Noteworthy proportions of adolescents – particularly females – report negatively about their experiences regarding fitness and the testing of it during physical education (PE). These accounts often coincide with lower levels of body image, fitness, motivation, and physical activity and higher rates of attrition from optional PE.

Purpose: The aim of this study was to test path relations between body size dissatisfaction (BSD), test anxiety (TA), self-efficacy, and fitness-related outcomes during fitness in PE and to determine whether these differ as a function of gender and level of BSD.

Method: Survey data were collected from 394 9th and 10th-grade students in southern Ontario, Canada. A previously validated BSD measure was used that consisted of a series of nine gender-specific silhouettes ranging from very thin/slender to very large/overweight. Students’ dissatisfaction score involved subtracting self-ratings of their ideal body size from current body size estimates. Fitness indices in PE (FIPE)was the z-score of the sum of self-reported fitness level, fitness grade in PE, and frequency of active exercise at least 30 minutes per day. Self-efficacy and TA were assessed using established scales from the Motivated Strategies for Learning Questionnaire.

Data analysis: Multivariate analysis of variance was used to assess group differences whereas gender-specific confirmatory factor and path analyses were used to test the proposed path in which relations between BSD and FIPE were manifest indirectly through TA and self-efficacy.

Findings: The hypothetical path fit the data in the overall sample and fit better for females than for males. Females reported a higher BSD and a lower self-efficacy and FIPE than males. BSD was evident in both genders with most females desiring a thinner body compared to boys who had relatively equal proportions wanting to be bigger and thinner. Males wanting to be smaller reported significantly lower self-efficacy and FIPE than males with little BSD or those wanting to be larger. Females desiring a thinner body reported significantly more TA and lower FIPE than females with no BSD.

Conclusion: Body image concerns and elevated levels of anxiety appear to undergird the influence of self-efficacy on FIPE. This is particularly so in females, although both females and males with a BSD are susceptible to lowered fitness motivation and achievement in PE. Suggestions are provided to help physical educators to structure fitness curricula and pedagogy to better minimize this vulnerability. These include catering to the gender-specific needs and preferences for fitness activities during PE including the testing of fitness.     

基于面阵传感器的固体表面速度二维相关测量

提出一种非接触二维实时相关检测物体瞬时速度新方法，具有适应性强、精度高等特点,介绍了相关测速理论与实现方法，并给出初步实验结果。     

Distributed leadership of school curriculum change: an integrative approach

Since its inception in 1999, the distributed leadership framework of Spillane, Halverson, and Diamond [2004. “Towards a Theory of Leadership Practice: A Distributed Perspective.” Journal of Curriculum Studies 36 (1): 3–34. doi:10.1080/0022027032000106726] has supported research into leadership and change in schools. Whilst the conceptual integrity of the framework is sound, research based upon its premises has attracted some criticism. The research has had a narrowed focus which has not generally reflected the inseparability of the elements of the framework and the situation within which leadership is enacted. In addition, it often fails to account for the complexity of critical elements of the environment such as micropolitics. This position paper proposes a reconfiguration of the distributed leadership framework as a research framework in response to this critique. The paper asserts that this new perspective that is presented is able to respond to the critique through an integrated approach that encompasses situation, social distribution and task enactment and which supports an integrated approach to research methodology. This adapted framework has the potential to more fully support research design that is actuality holistic and embedded in the context.     

Stuart Hall at the Open University

ABSTRACT

Accounts of the influence of Stuart Hall's thought on subsequent developments tend to neglect his work at the Open University. This unjustifiable neglect is illustrated by the example of his contribution to the course on Beliefs and Ideology, especially his article on 'Religious ideologies and social movements in Jamaica' [Hall, S. (1985). Religious ideologies and social movements in Jamaica. In R. Bocock & K. Thompson (Eds.), Religion and ideology (pp. 269–297). Manchester, UK: Manchester University Press].     

Part of the main: a project for English

The teaching of English in England has been transformed over the last two decades by powerful, top‐down orthodoxies, that in turn relate to a European‐wide shift in education towards market‐orientated, neo‐liberal policy goals. One of the effects of this reshaping is that the openness of English to popular cultures has been lessened and its links to the interests of social movements attenuated. Yet, unlike its conservative predecessor, present‐day policy orthodoxy seeks not so much the obliteration of the cultural interests that sustained English than their translation into a new form, in which ideas of ‘creativity’, ‘personalisation’ and ‘innovation’ are reinterpreted in neo‐liberal terms. The article considers how, in such complex conditions, the principles of a new project for English can be developed.     

Plausibility Judgments in Conceptual Change and Epistemic Cognition

Plausibility judgments rarely have been addressed empirically in conceptual change research. Recent research, however, suggests that these judgments may be pivotal to conceptual change about certain topics where a gap exists between what scientists and laypersons find plausible. Based on a philosophical and empirical foundation, this article presents a theoretical model of the role of plausibility judgments in conceptual change (PJCC) with implications for epistemic cognition. The PJCC moves beyond the limitations of cold cognitive processing by incorporating the warmer constructs of affect, motivation, and motivated reasoning. We review recent research in plausibility judgments that informed the PJCC's development and discuss components of the model. Of particular note is the importance of using explicit critical evaluation to reappraise plausibility judgments that may have been originally made through implicit cognitive processes. We also suggest potentially productive areas of future research based on the PJCC model.     

Balancing supportive relationships and developing independence: an activity theory approach to understanding feedback in context for master’s students

Abstract

Master’s students are expected to be self-regulating and independent learners. Dialogic feedback has been identified as one way of promoting such independence. There continues to be concern about the extent to which master’s students are achieving this level of functioning. This study aimed to identify feedback practices and contexts which facilitated student engagement and independence. Working with students as co-researchers, interviews were conducted with 27 master’s students from three programmes. Activity theory was used as an analytical tool to generate understanding of feedback in the social context of each programme. Findings indicate there can be tension between factors which promote dialogical feedback and those which promote independence, and that active dialogic feedback with staff may limit student engagement with peer feedback.     

Motivational interviewing as a positive response to high‐school bullying

Intervention approaches to bullying are largely preventive in nature, and even these have been shown to be ineffective, if not iatrogenic, with adolescents. Responses to bullying are limited to traditional punitive approaches or “no‐blame” approaches aiming to restore the relationship between the targeted students. Neither of these approaches may effectively engage the perpetrator of bullying at a motivational level, and we propose motivational interviewing (MI) as a means of promoting meaningful behavioral change among youths who bully. We provide a narrative review of MI and map its core features onto the extant literature on self‐reported motivations for bullying, highlighting the ways that MI fits with bullying and could serve as a potent solution that could be deployed by school psychologists and other student support staff members. Qualitative preliminary feedback and initial competency in MI from trained practitioners are presented as preliminary data from a cluster‐randomized control trial, documenting school staff perspectives on the integration of MI into their approach to bullying with recommendations for integrating MI into school settings.     

基于FPGA的TFT-LCD控制器IP核设计

伴随着嵌入式系统的迅速发展,TFT-LCD控制器IP成为SoC芯片中的一个重要部件。文章介绍了一种使用FPGA芯片设计TFT液晶显示屏控制器的方法。该方法加快了数据的处理速度,提高了系统的兼容性,节约了硬件成本。