高温环境下咖啡因对耐力大学生运动员运动中唾液sIgA、溶菌酶的影响          下载免费PDF全文

刘畅  韩延柏  杨春秋  刘斯娜 《体育科研》2017,(2):82-86

探讨高温环境下运动中，口服咖啡因对男大学生运动员运动中唾液分泌型免疫球蛋白A（sIgA）和溶菌酶（lysozyme，LZM）的影响。采用实验研究方法，以13名男性耐力性项目大学生运动员为研究对象。每名研究对象在温度为33℃、相对湿度为65%的实验室完成两次实验（咖啡因运动实验和对照运动实验）。每次实验中，采集运动前60 min、运动前即刻、运动20 min、运动结束即刻的唾液样本，测定唾液sIgA、LZM的浓度。实验结果显示，口服咖啡因对高温环境下耐力大学生运动员运动中唾液sIgA无影响，但会降低唾液LZM水平，高温环境、中等强度运动使男耐力大学生运动员唾液sIgA和LZM的水平升高。  相似文献   

某些特殊类型差分方程(递推关系)的解法     

查良松 《浙江工贸职业技术学院学报》2004,4(1):61-64

本文以微分方程理论为背景探索一些特殊的差分方程的解法,从而得到了一些有规律性的结果,进一步解决一类递推关系差分方程的解法.  相似文献   

Bilateral practice improves dominant leg performance in long jump     

Anne Focke  Sina Spancken  Christian Stockinger  Benjamin Thürer  Thorsten Stein 《European Journal of Sport Science》2016,16(7):787-793

Benefits of bilateral practice both for the non-dominant and for the dominant body side have been shown in several studies. Thereby, most of the studies included movement tasks of the upper extremity or investigated sports games in which the ability of acting bilaterally is an essential basis for success and, thus, a bilateral practice is reasonable anyway. Individual unilaterally performed sports including movement tasks of the lower extremity are rarely investigated. Therefore, the aim of our study was to test if contralateral transfer due to bilateral practice can be found in an unilaterally performed sport including the lower extremity. We trained and tested 61 adolescent athletes in long jump to compare the jumping performance of the dominant leg after a 12-week practice period between two groups: a bilateral practice group that practiced specific long jump exercises with both the dominant and non-dominant leg and an unilateral practice group that practiced specific long jump exercises only with the dominant leg. Results showed a superior effect of bilateral practice compared to unilateral practice regarding the jumping performance of the dominant leg. The performance increase at post-test and retention-test for the dominant limb was significantly higher for the bilateral practice group (pre-to-post: 5.2%, pre-to-retention: 7.4%) compared to the unilateral practice group (pre-to-post: 3.4%, pre-to-retention: 4.5%). Thus, bilateral practice should be established in the early practice programmes of track and field athletes to improve the performance of the dominant take-off leg.  相似文献   

Duality of educational policy as global and local: the case of the gender equity agenda in national principles and state actions     

Seung-Hwan Ham  Lynn W. Paine  Yun-Kyung Cha 《Asia Pacific Education Review》2011,12(1):105-115

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公共图书馆在突发公共卫生事件中的信息服务工作探讨     

查炜 《河北科技图苑》2020,33(5):44-49

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Towards a deeper understanding of meaningful use in electronic health records     

Sina Joneidy  Maria Burke 《Health information and libraries journal》2019,36(2):134-152

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Synchronization of discrete-time complex dynamical networks with interval time-varying delays via non-fragile controller with randomly occurring perturbation     

M.J. Park  O.M. Kwon  Ju H. Park  S.M. Lee  E.J. Cha 《Journal of The Franklin Institute》2014

This paper addresses synchronization problem for discrete-time complex dynamical networks with interval time-varying delays. In order to achieve the synchronization, a feedback controller subjected to randomly occurring perturbations will be considered. The randomly occurring perturbations are assumed to belong to the Binomial sequence. By constructing a suitable Lyapunov–Krasovskii functional, and utilizing reciprocally convex approach and Finsler?s lemma, the synchronization criteria for the networks are established in terms of linear matrix inequalities (LMIs) which can be easily solved by various effective optimization algorithms. The networks are represented by the use of Kronecker product technique. The effectiveness of the proposed methods will be verified via numerical examples.  相似文献   

A praxeological perspective for the design and implementation of a digital role-play game     

Eric Sanchez  Réjane Monod-Ansaldi  Caroline Vincent  Sina Safadi-Katouzian 《Education and Information Technologies》2017,22(6):2805-2824

This paper draws on an empirical work dedicated to discussing a theoretical model for design-based research. The context of our study is a research project for the design, the implementation and the analysis of Insectophagia, a digital role-play game implemented in secondary schools. The model presented in this paper aims at conceptualizing researchers’ and practitioners’ relationships with the notion that knowledge development takes place at a meta-didactical level when the participants develop a shared practice and a shared discourse on practice (a common praxeology). This is done through collaboration and teacher-centered design of innovative learning settings. This model emerges from a double approach: (1) a literature review on collaborative research in education and, (2) an analysis of the verbal interactions of practitioners and researchers involved in the project. The study emphasizes the development of knowledge among participants. It also emphasizes the importance of knowledge brokering for filling the gap between research and practice and thus, for the adoption of digital technology by practitioners.  相似文献   

《觉醒》——一部生态女性主义的杰作     

李察 《科教文汇》2011,(34):93-95

凯特·肖邦的《觉醒》一直被认为是女性主义意识觉醒的一部代表作,本文试图从生态女性主义的角度对这部小说进行解读,从女性与自然的亲近性入手分析女主人公艾德娜女性主体意识觉醒的内因与外因。此外,小说中的多重意象也充分反映了作者的生态女性主义意识。  相似文献   

授渔的启示     

紫姹 《吉林广播电视大学学报》2010,(10):2-2

老聃是我国古代伟大的哲学家和思想家、道家学派的创始人,后人从他的学说中汲取了许多营养。"无为而治"就是他的著名学说之一,人们从中领  相似文献