Lactate accumulation following isometric exercise training and its relationship with reduced resting blood pressure

The purpose of this study was (a) to assess lactate accumulation during isometric exercise, and to quantify the shifts in accumulation following isometric training; and (b) to relate any training-induced changes in lactate accumulation to reductions in resting blood pressure. Eleven male participants undertook isometric training for a 4-week period using bilateral-leg exercise. Training caused reductions in systolic, diastolic, and mean arterial resting blood pressure (of -4.9 ± 6.3 mmHg, P = 0.01; -2.6 ± 3.0 mmHg, P = 0.01; and -2.6 ± 2.3 mmHg, P = 0.001 respectively; mean ± s). These were accompanied by changes in muscle activity, taken as electromyographic activity to reach a given lactate concentration (from 114 ± 22 to 131 ± 27 mV and from 136 ± 25 to 155 ± 34 mV for 3 and 4 mmol · L(-1) respectively. Training intensity expressed relative to peak lactate was correlated with reduced resting systolic and mean arterial blood pressure. Training caused significant shifts in lactate accumulation, and reductions in resting blood pressure are strongly related to training intensity, when expressed relative to pre-training peak lactate. This suggests that higher levels of local muscle anaerobiosis may promote the training-induced reductions in resting blood pressure.     

The production of Australian professional development policy texts as a site of contest: The case of the federal quality teacher programme

This paper reveals how the provision of teacher professional development is conceptualised within the Australian Government Quality Teacher Programme (AGQTP) policy text and its predecessors, and uses these texts to infer the nature of the production practices associated with the development of these policies. The paper argues that multiple tensions within these texts gesture towards support for complex and contested approaches to professional development during the policy production process. To make sense of this contestation, the paper draws suggestively upon Bourdieu’s field theory, which conceptualises the social world as consisting of social spaces or “fields”, and extensions of his theory, which reveal fields as exerting considerable influence upon one another. The paper argues that “Quality Teacher Programme” texts infer support for more progressive, social democratic approaches to the provision of teacher professional development within the educational policy field, as well as more economistic and neoliberal approaches.     

Towards a meta-research agenda in science and enviormental educaion

Abstract

This paper begins by establishing the existence of a debate in the broader educational community about the nature, meaning and significance of educational research, and its recognition that different approaches to educational research do not simply represent different strategies for data collection but rest on and express different ideologies that implicate different political attitudes among teachers, students, subject‐matters,schools, support agencies and researchers themselves. Evidence can be seen that this debate is beginning to appear in the science education literature and it is believed that the arguments can be extended.

It is argued that research in science education and environmental education needs to consider methodology in the political terms of ideology, rather than simply in the technical terms of method and technique. Some of the recent thinking about the politics of method in both science education and environmental education, is then considered briefly and a number of meta‐research questions are proffered that might focus further attention on the political theory of research in these two fields.     

Developing,Evaluating and Demonstrating the Use of a Conceptual Survey in Mechanical Waves

An understanding of mechanical waves is a pre‐requisite for the study of many topics in advanced physics, and indeed in many other disciplines. There have been many research studies in mechanical waves, all of which have revealed that students have trouble with the basic concepts. Therefore, in order for teachers to prepare appropriate instruction for their classes, it is useful to diagnose their students' conceptions—if possible before they enter class. It is for this purpose that many diagnostic instruments have been developed, often in the form of multiple‐choice tests. In this study, we have used the open‐ended Wave Diagnostic Test to develop a multiple‐choice conceptual survey in an evolutionary manner. The two‐year development procedure included open‐ended surveys and interviews involving 299 Thai students and 88 Australian students. The final version, called the Mechanical Waves Conceptual Survey, has been administered to 632 Australian students from high school to second‐year university and 270 Thai high school students. Standard statistical analyses show that the survey is reliable and valid. Further validity checks, including consultation with experts, were also carried out. The survey has four subtopics—propagation, superposition, reflection, and standing waves—and the teachers can choose the subtopics relevant for their students. In this paper we also demonstrate the use of a typical survey question to test students' conceptual understanding and identify common alternative conceptions.