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Ring C Carroll D Hoving J Ormerod J Harrison LK Drayson M 《Journal of sports sciences》2005,23(5):501-508
It has been suggested that the psychological stress associated with competitive sports events may help to explain the increased susceptibility to respiratory infections due to reductions in secretory immunity. In the current study, we investigated the influence of competitive exercise and psychological stress on secretory immunoglobulin A (s-IgA). Salivary s-IgA and heart rate were measured in 62 healthy young recreationally active men at rest and, in a between-subjects design, following one of four 8-min tasks: mental arithmetic, cycling at workloads of 60 to 180 W (mean = 146 W), mental arithmetic while cycling, or competitive cycling. Mental arithmetic was associated with significant increases in s-IgA concentration (mean = 49 microg.min(-1)) and s-IgA secretion rate (mean = 25 microg.ml(-1)) compared with rest, while mental arithmetic combined with exercise was associated with a significant increase in s-IgA concentration only (mean = 124 microg.min(-1)). In contrast, competitive exercise and exercise alone did not influence s-IgA concentration or secretion rate. Heart rate increased modestly to mental arithmetic (mean = 7 beats.min(-1)) and substantially, and similarly, to the three exercise tasks (mean = 56(62 beats.min(-1)). The hypothesis that the psychological stress of competitive exercise contributes to increased susceptibility to infection via reductions in s-IgA requires further investigation. 相似文献
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中小型图书馆如何应对知识服务 总被引：1，自引：0，他引：1
近些年来图书馆界对知识服务的讨论持续升温,但实施知识服务的主要是大学图书馆,并认为是高科技、高层级的服务。中小型图书馆要解放思想,不要认为知识服务是高不可及,要加大改革力度,深化管理与服务,加速馆员队伍建设,培养适应知识服务的人才,迎接知识服务的挑战。 相似文献
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Adrienne Alton-Lee Christine Rietveld Lena Klenner Ngaio Dalton Cathy Diggins Shane Town 《International Journal of Inclusive Education》2013,17(3):179-210
This paper provides an account of a teacher's use of theory as a tool to develop inclusive practice through a social studies programme in a new entrant class. The account illustrates the ways in which the teacher drew on research to assist in the facilitation of an inclusive educational environment. Presented are research case studies the teacher encountered in an in-service teacher education programme, and the ‘social constructionist’ and ‘personal tragedy’ models that were used as theoretical tools to assist the teacher's planning and teaching practice. Mounted cameras, broadcast microphones and pre- and post-unit interviews with the teacher and students were used to explore the lived culture of the classroom, and the nature and effectiveness of the strategies the teacher used. An ‘interrupted narrative’ methodology engages the reader in the interplay between research and theory in the research case studies. Four major strategies used by the teacher have been identified and these are presented as theoretical tools for other teachers and teacher educators to use, critique and develop to support inclusive practice in their own contexts. 相似文献