排序方式： 共有49条查询结果，搜索用时 15 毫秒
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Iain Hunter Aubree McLeod Dru Valentine Tyler Low Jared Ward Ron Hager 《Journal of sports sciences》2013,31(20):2367-2373
ABSTRACTThe choice of marathon racing shoes can greatly affect performance. The purpose of this study is to metabolically and mechanically compare the consumer version of the Nike Vaporfly 4% shoe to two other popular marathon shoes, and determine differences in running economy. Nineteen subjects performed two 5-minute trials at 4.44m/s wearing the Adidas Adios Boost (AB), Nike Zoom Streak (ZS), and Nike Vaporfly 4% (VP) in random order. Oxygen uptake was recorded during minutes 3–5 and averaged across both shoe trials. On a second day, subjects wore reflective markers, and performed a 3-minute trial in each shoe. Motion and force data were collected over the final 30 seconds of each trial. VP oxygen uptake was 2.8% and 1.9% lower than the AB and ZS. Stride length, plantar flexion velocity, and center of mass vertical oscillation were significantly different in the VP. The percent benefit of the VP over AB shoe was predicted by subject ground time. These results indicate that use of the VP shoe results in improved running economy, partially due to differences in running mechanics. Subject variation in running economy improvement is only partially explained by variation in ground time. 相似文献
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Peter F. Hager 《体育哲学杂志》2016,43(1):171-174
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Workplace learning has emerged as a significant site of adults' informal experiential learning, with implications for the provision and shape of formal education. There are, however, a prohibitive number of variables encumbering research into such learning. We can bypass the variables by focusing on phenomenal accounts of how professionals (in this instance) make judgements at work, underpinned by an organic logic derivable from Dewey. This article shows how to characterize a new epistemology of practice through both empirical and conceptual innovation, and thus advances the detail of this new informal workplace learning. This epistemology deals in five characteristics central to lifelong learning anyway, namely: the contingent (rather than exclusively formal, sustained, and systematic studies); the practical (rather than exclusively the theoretical); the process (rather than exclusively the assimilation of content); the particular (rather than the exclusively universal and a priori as the ‘context’); and the affective and the social domains (rather than exclusively the cognitive domain). Our fieldwork so far shows, through interview findings, how these are prominent in professional workplace judgments, and what prospects there are for further research on judgment as a site of ‘organic’ learning for adults. 相似文献
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W. R. Hager 《科学教学研究杂志》1974,11(2):121-131
The verbal behavioral patterns of twenty university professors instructing undergraduate engineering classes have been investigated utilizing a fourteen category modification of Flanders' system of interaction analysis. On the basis of an internal evaluation criteria, these instructors were divided into three groups: those receiving the highest, middle, and lowest evaluations. The verbal instructional patterns and classroom climates of these three groups are compared. Several significant findings are reported. 相似文献