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111.
Stephan Sorichter Johannes Mair Arnold Koller Erich Muller Christian Kremser Werner Judmaier 《Journal of sports sciences》2013,31(9):687-691
The aim of this study was to examine the relationship between myosin heavy chain (MHC) release as a specific marker of slow-twitch muscle fibre breakdown and magnetic resonance imaging (MRI) of skeletal muscle injury after eccentric exercise. The effects of a single series of 70 high-intensity eccentric contractions of the quadriceps femoris muscle group (single leg) on plasma concentrations of creatine kinase and MHC fragments were assessed in 10 young male sport education trainees before and 1 and 4 days after exercise. To visualize muscle injury, MRI of the loaded thigh was performed before and 4 days after the eccentric exercise. All participants recorded an increase ( P ? 0.05) in creatine kinase after exercise. In five participants, T2 signal intensity was unchanged post-exercise compared with pre-exercise and MHC plasma concentration was normal; however, they showed an increase ( P ? 0.05) in creatine kinase after exercise. For the remaining five participants, there was an increase in T2 signal intensity of the loaded vastus intermedius and vastus lateralis. These changes in MRI were accompanied by an increase in MHC plasma concentration ( P ? 0.01) as well as an increase in creatine kinase ( P ? 0.01). We suggest that changes in MRI T2 signal intensity after muscle damage induced by eccentric exercise are closely related to damage to structurally bound contractile filaments of some muscle fibres. Additionally, MHC plasma release indicates that this damage affects not only fast-twitch fibres but also some slow-twitch fibres. 相似文献
112.
Cheryl W. Maglischo 《Research quarterly for exercise and sport》2013,84(3):595-603
Abstract Twelve anthropometric measures and 23 derived indexes were obtained from 72 girls at each level along with 25 cable tensiometer strength tests which were averaged as the criterion. The measures, indexes, and strength criterion were intercorrelated. The highest multiple correlations with the strength criterion were .822, using height times the cube root of weight and arm girth/thigh girth at the elementary level; .784, using chest girth times standing height and shoulder width at the junior high level; and .607, using arm girth and shoulder width/hip width at the senior high level. Combining all levels gave an r of .844 using age and weight. Anthropometric measures intercorrelated higher for elementary school girls, but the indexes intercorrelated higher at the junior and senior high levels than at the elementary level. 相似文献
113.
Abstract The purpose of the present study was to determine velocity discrimination characteristics of subjects in a difference threshold paradigm. After recruitment, 180 male and female subjects were randomly assigned to 1 of 6 groups differentiated by the length of the stimulus runway and the subjects' orientation to the stimulus. Stimulus velocities were presented on a modified Bassin Anticipation Timer with presentation rate controlled by a programmed timer. The criterion velocities were 134.11, 268.22 and 402.33, cm/sec with variable velocities ranging 44.7 cm/sec above and below the criterion in 8.94 cm/sec increments. The method of constant stimuli was used with 198 trial pairs presented (constant 7 second stimulus presentation interval). The results indicated that the discrimination of horizontal linear velocity follows a prothetic continuum. That is, the just noticeable difference increased in proportion to the increase in the criterion velocity. In addition, the subjects' orientation to the stimulus and the viewing distance (length of runway) seemed to play little or no role in the discrimination process. 相似文献
114.
Anchored in the narrative inquiry tradition, this paper examines commonly held motives about curriculum making from the perspectives of four experienced physical education teachers in Korea. Field texts were collected throughout by employing narrative research tools such as in-depth interviews, focus groups, class observations and documents analyses, and transformed into research texts using broadening, burrowing, and storying and restorying as suggested by Connelly and Clandinin. For experienced physical educators, this paper illuminates what motivates curriculum making as a narrative phenomenon storied and restoried over time. Different stories produced different motives of curriculum making, and a number of issues related to teacher development for curriculum making emerged. 相似文献
115.
Two Web-based breastfeeding programs were developed to provide new parents with necessary information on proper breastfeeding techniques. One version was plain text and the other version combined text with graphics. The computer was viewed as a valuable learning tool. The breastfeeding program that contained graphics was preferred over the text-only program. Educators are encouraged to use Web-based graphic programs to provide breastfeeding education to new parents. 相似文献
116.
Christin DePouw Cheryl Matias 《Educational Studies A Journal of the American Educational Studies Association》2016,52(3):237-259
Parenting is often discussed in the field of education, but frequently in terms of family or community deficiency, rather than strengths (Bonilla Silva, 2006; Few, 2007), particularly when communities of color are being examined. In this conceptual article, we advocate for the use of critical race theory (CRT) in discussions of parenting and utilize counterstorytelling to validate the lived experiences of parents like ourselves, who are critical race scholars as well as mothers of children of color. Our counterstories will be embedded throughout the discussion as a way to highlight the relationships between academic research and lived experience. Through reviews of academic research and counterstorytelling, we explain the relevance of critical race parenting and the ways in which the inclusion of CRT can support more historically situated, contextual, and complex engagements with the interplay between race and parenting of children of color. 相似文献
117.
Consulting in statistics is usually deferred until at least near the end of a first degree, but this article shows how some aspects can be effectively taught to students in upper secondary or early tertiary courses in a way which reinforces their learning of standard basic concepts. We suggest that the existence of a real client adds a degree of realism not available in other ways, and emphasizes to students the importance of blending statistical calculations with meaningful communication. 相似文献
118.
Yi-Hwa Liou Alan J. Daly Esther T. Canrinus Cheryl A. Forbes Nienke M. Moolenaar Frank Cornelissen 《Teachers and Teaching》2017,23(6):635-657
This exploratory study foregrounds the important, but often understudied social side of pre-service teacher development and its relation to teaching performance in one university-based teacher preparation program in the US. We examine the extent to which pre-service elementary teachers’ social relationships and perceptions of peer trust and efficacy are associated with performance on a high stakes mathematics teaching assessment. Findings suggest that social and emotional support through close social ties, peer trust, and self-efficacy are significantly and positively associated with pre-service teachers’ teaching performance. Our work further contributes to the development and discourse about teacher education in university-based teacher preparation programs. 相似文献
119.
John P. Dougherty Ned F. Kock Cheryl Sandas Robert M. Aiken 《Education and Information Technologies》2002,7(2):137-154
Information technology holds the promise of increased productivity. However, rapidly evolving tools require a professional able to incorporate these tools into their careers effectively, which signals the need for IT curriculum development initiatives that incorporate the use of complex, domain-specific IT applications in specific professional fields. This paper reports on a study that addresses this need, by developing, assessing and refining a curriculum development framework. The Information Technology Fluency (ITF) framework is a methodology for constructing components (case studies) for inclusion into existing or newly proposed courses to help students develop the skills needed for this challenge. Results obtained using the framework are reported, compared to similar work at a different institution, and used to suggest improvements to the framework. 相似文献
120.
This paper presents a theory of visual stress. The theory is applied to the assessment of symptoms of visual stress and its treatment with coloured filters. The theory has implications for standard reading assessments that relate both to the visual skills and the age of the children taking the tests. These implications are reviewed, with the conclusion that insufficient attention is paid to visual factors in reading, particularly in the design of reading tests. 相似文献