Magnesium status and the physical performance of volleyball players: effects of magnesium supplementation

Abstract

The aim of this study was to test the hypothesis that magnesium supplementation influences the physical performance of volleyball players, as the efficacy of this approach remains questionable. Twenty-five professional male volleyball players were assigned randomly to experimental (350 mg Mg · d^–1, 4 weeks) and control groups (500 mg maltodextrin · d^–1, 4 weeks) maintaining inter-group homogeneity of urinary magnesium. Erythrocyte, plasma and urinary magnesium levels, plasma creatine kinase activity, lactate production, maximal oxygen uptake (VO₂ max) and plyometric (squat jump, countermovement jump, countermovement jump with arm swing) and isokinetic (peak torque, potency and total work) performances were evaluated before (T₀) and after (T₁) supplementation. Levels of erythrocyte and urinary magnesium and creatine kinase activity and VO₂ max remained within normal ranges in both groups. Plasma magnesium decreased significantly only within the experimental group. Significant decreases in lactate production and significant increases (of up to 3 cm) in countermovement jump and countermovement jump with arm swing values were detected in the experimental group following magnesium supplementation, but not in the control group at T₁. It is concluded that magnesium supplementation improved alactic anaerobic metabolism, even though the players were not magnesium-deficient.     

Toddlers Use the Number Feature in Determiners During Online Noun Comprehension

Function words support many aspects of language acquisition. This study investigated whether toddlers understand the number feature of determiners and use it for noun comprehension. French offers an ideal “test case” as number is phonetically marked in determiners but not in nouns. Twenty French‐learning 24‐month‐olds completed a split‐screen experiment. Looking times to target pictures were measured under 3 trial types varying in the degree to which the determiner matched the number displayed in the object(s). Children looked longer when the determiner matched the object(s), and were confused in trials of clear mismatch. Importantly, their processing resembled that of French adults ( D. Dahan, D. Swingley, M. K. Tanenhaus, & J. S. Magnuson, 2000 ). Thus, children understand the determiner number feature early in acquisition and use this knowledge to constrain online comprehension.     

INTERCULTURALISM,MULTICULTURALISM, AND THE STATE FUNDING AND REGULATION OF CONSERVATIVE RELIGIOUS SCHOOLS

In this essay, Bruce Maxwell, David Waddington, Kevin McDonough, Andrée‐Anne Cormier, and Marina Schwimmer compare two competing approaches to social integration policy, Multiculturalism and Interculturalism, from the perspective of the issue of the state funding and regulation of conservative religious schools. After identifying the key differences between Interculturalism and Multiculturalism, as well as their many similarities, the authors present an explanatory analysis of this intractable policy challenge. Conservative religious schooling, they argue, tests a conceptual tension inherent in Multiculturalism between respect for group diversity and autonomy, on the one hand, and the ideal of intercultural citizenship, on the other. Taking as a case study Québec's education system and, in particular, recent curricular innovations aimed at helping young people acquire the capabilities of intercultural citizenship, the authors illustrate how Interculturalism signals a compelling way forward in the effort to overcome the political dilemma of conservative religious schooling.     

A struggle of civilization against barbarism: about universities as autonomous zones

This paper takes a longue durée look at universities at the core of the world economy, where the modern idea of intellectuals as trustees of the reflexive structures of society has achieved its most enduring institutional form. To wrest thinking away from a conformism that makes us see universities as nothing more than organisations amongst organisations forever in process of adapting themselves to the exigencies of world ordering, we focus on three moments of rupture: (i) the ‘prehistory of higher education’, when the work of the medieval renaissance was ‘largely done’ and original universities where founded in the folds of the nascent European économie-monde, (ii) the crisis of the Bretton Woods world order, and (iii) the present juncture     

Multiobjective optimization and multivariable control of the beer fermentation process with the use of evolutionary algorithms

This paper describes empirical research on the model, optimization and supervisory control of beer fermentation. Conditions in the laboratory were made as similar as possible to brewery industry conditions. Since mathematical models that consider realistic industrial conditions were not available, a new mathematical model design involving industrial conditions was first developed. Batch fermentations are multiobjective dynamic processes that must be guided along optimal paths to obtain good results. The paper describes a direct way to apply a Pareto set approach with multiobjective evolutionary algorithms (MOEAs). Successful finding of optimal ways to drive these processes were reported. Once obtained, the mathematical fermentation model was used to optimize the fermentation process by using an intelligent control based on certain rules.     

A Meta-analysis of the Impact of Social and Emotional Learning Interventions on Teachers’ Burnout Symptoms

Educational Psychology Review - Over the last decades, extensive research has given considerable attention to teachers’ burnout. Owing to its negative personal, organizational, and social...     

Hochschule und Arbeitsmarkt im Bologna-Prozess

In the Bologna process, “employability” has become an important objective of higher education, shaping the current discussion on the relationship between higher education and the labor market. The popularity of the term “employability”, however, seems to be negatively correlated with its precision. Therefore, the article first discusses the meaning of this concept and its usefulness for higher education. We come to the conclusion that employability is not an appropriate guiding principle for higher education reform. Key competencies are central to the concept of employability. However, the significance of key competencies is independent of the role they play in the concept of employability; they are also central to the necessarily flexible relationship between higher education and work. Therefore, this paper also addresses the question of whether the restructuring of the German higher education system was accompanied by curricular and didactic reforms, which facilitate the acquisition of key competencies. According to the results of the German Higher Education Information System HIS graduate survey 2005, the answer to this question is a cautious “yes”. In view of the limited empirical basis and the early date of the survey, however, we advise against premature generalizations.     

Counteracting fabricated anti-gay public pedagogy in Uganda with strategic lifelong learning as critical action

Political, cultural and social fallout following the introduction of the anti-homosexuality bill in Uganda in 2009 intensified fabrication of an anti-gay public pedagogy of negation and nemesis that fuelled the passage of the Anti-Homosexuality Act, 2014. The Government of Uganda, conventional Anglicanism and US evangelical Christianity were all implicated in developing this homophobic public pedagogy. This article provides an extensive account of what transpired to result in prohibition of lifelong learning focused on Ugandan sexual minorities. In the face of this prohibition, the article calls for lifelong learning as critical action constructed as strategic public counter-pedagogy aimed at recognizing and accommodating sexual minorities in the face of homophobia. This critically progressive counter-pedagogy would include a pragmatic turn to comprehensive health education as a starting point for inclusive, holistic learning. The article also considers the important role that media could play in this work. It explores contemporary realities of advancing and deploying lifelong learning as critical action in Uganda, examining the current dire state of education in the nation. It concludes by considering the status of Uganda’s tenacious quest to entrench gay apartheid amid what is now a growing trend toward global gay inclusion.     

University education,credentialism and social stratification among Palestinian Arabs in Israel

Few attention was devoted to the relative impact exerted by differential university access and credentialing patterns on the intrasocial stratification of subordinate groups. The paper investigates the issue among Palestinian Arabs in Israel, along religious, socioeconomic and gender lines, as well as in comparison to respective trends of the Jewish majority. Findings suggest that, while inequalities in access, retention and graduation rates at university level persist between Jews and Palestinian Arabs; for the latter, the combined effects of labor-market structure and regulative sectorial state policies, have determined considerably the relative impact of social group of origin on university enrollment, retention and graduation rates. The various implications of these findings are then discussed, urging further, and more elaborate, research into their socioeconomic and political consequences.