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Karsten Koehler Neele R. Hoerner Jenna C. Gibbs Christoph Zinner Hans Braun Mary Jane De Souza 《Journal of sports sciences》2016,34(20):1921-1929
Low energy availability, defined as low caloric intake relative to exercise energy expenditure, has been linked to endocrine alterations frequently observed in chronically energy-deficient exercising women. Our goal was to determine the endocrine effects of low energy availability in exercising men. Six exercising men (VO2peak: 49.3 ± 2.4 ml · kg?1 · min?1) underwent two conditions of low energy availability (15 kcal · kg?1 fat-free mass [FFM] · day?1) and two energy-balanced conditions (40 kcal · kg?1 FFM · day?1) in randomised order. During one low energy availability and one balanced condition, participants exercised to expend 15 kcal · kg?1 FFM · day?1; no exercise was conducted during the other two conditions. Metabolic hormones were assessed before and after each 4-day period. Following both low energy availability conditions, leptin (?53% to ?56%) and insulin (?34% to ?38%) were reduced (P < 0.05). Reductions in leptin and insulin were independent of whether low energy availability was attained with or without exercise (P > 0.80). Low energy availability did not significantly impact ghrelin, triiodothyronine, testosterone and IGF-1 (all P > 0.05). The observed reductions in leptin and insulin were in the same magnitude as changes previously reported in sedentary women. Further research is needed to understand why other metabolic hormones are more robust against low energy availability in exercising men than those in sedentary and exercising women. 相似文献
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Laura Terry Punya Mishra Danah Henriksen Leigh Graves Wolf Kristen Kereluik 《TechTrends》2013,57(3):34-39
This article describes the design and implementation of the year 2 curriculum and student learning experiences in the Michigan State University Master of Arts in Educational Technology program. We discuss the ways that this second set of courses builds on the first year of the program that students encounter, and also describe the theoretical impetus and design-based implications for learning how to teach with technology in effective and creative ways. Students in this group usually come in with some prior knowledge of educational theory, as well as some experience of working with classroom technologies. We intentionally build upon this prior knowledge, to take it to the next level of a more sophisticated TPACK-oriented understanding of learning in technology-driven contexts. Our year 2 courses move classical educational psychology theories of learning, along with educational research issues, squarely into the modern context of educational technology and teacher leadership. Our curriculum design focuses centrally on making meaningful experiences for teachers around technology, and helping them develop the knowledge and skills to create such experiences for their students. Our goal is to develop teachers who see themselves as flexible designers of learning experiences through the creative re-purposing of existing technologies. 相似文献
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Maria Vetleseter Bøe Ellen Karoline Henriksen Terry Lyons Camilla Schreiner 《Studies in Science Education》2013,49(1):37-72
Young people’s participation in science, technology, engineering and mathematics (STEM) is a matter of international concern. Studies and careers that require physical sciences and advanced mathematics are most affected by the problem and women in particular are under‐represented in many STEM fields. This article views international research about young people’s relationships to, and participation in, STEM subjects and careers through the lens of an expectancy‐value model of achievement‐related choices. In addition it draws on sociological theories of late‐modernity and identity, which situate decision‐making in a cultural context. The article examines how these frameworks are useful in explaining the decisions of young people – and young women in particular – about participating in STEM and proposes possible strategies for removing barriers to participation. 相似文献
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