共查询到20条相似文献，搜索用时 478 毫秒
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目的:研究运过度运动导致的导致急性心内膜炎预防与治疗方法,预防运动性心肌损伤发射。方法:采用PAFAFAC分析方法结合多元线性回归分别对两组近红外光谱数据进行了分析,得到人体三层骨骼肌模型的蒙特卡罗模拟,由广义梯度近似GGA观测免疫细胞凋亡模型,通过对血液样本中的羧甲基纤维素锂(CMC-S)进行合成流变分析,分析患者在躯体神经支配下心肌内膜收缩或舒张。结果:通过运动骨骼肌免疫细胞凋亡抑制方法,能有效对过度运动训练损伤导致的急性心内膜炎等并发症实现诊疗。肺动脉收缩压有82.6 mm Hg改善为92.0 mm Hg,肺动脉舒张压有44.9 mm Hg改善为50.3mm Hg。结论:采用免疫细胞凋亡干预后,肺动脉能短期实现修复,可以改善患者的脉氧饱和度,合并胸痛、浮肿、高烧等急性心内膜炎病症,从而避免运动员出现急性心内膜炎的症状,对避免运动员因过度训练导致的心衰竭和体循环缺血缺氧等也有积极的临床疗效。 相似文献
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疲劳是一种主观感受,表现为暂时性人的工作能力的下降,经过休息调整能得以消除。文章主要结合竞技体育训练方面的实践,通过文献资料查阅的方法,在运动性疲劳产生机制的判断基础上,论述营养补充对运动性疲劳的消除作用。营养补充消除法方面的研究能够提高教练员、运动员、体育管理人员对此问题的认识和关注,以便更好地指导运动训练与竞赛。 相似文献
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运动性疲劳的产生与运动形式有密切关系。本文采用文献综述法,从不同运动形式的供能特点出发,分析在不同运动形式下,运动性疲劳产生的特征。揭示运动性疲劳与运动形式的关系这对于加快疲劳的消除,提高训练水平有着重要意义。 相似文献
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郭晓兵 《内蒙古科技与经济》2000,(Z1)
疲劳是一种正常的生理现象 ,而在训练中 ,由于机体能量消耗过大 ,代谢产物堆积 ,导致机体运动能力下降则更是一个普遍存在的问题。所谓运动性疲劳 ,即指运动负荷超过机体承受能力而出现的一些组织器官甚至整个机体工作能力暂时下降的现象。众所周知 ,机体疲劳的消除与运动训练的效果有着密切关系 ,没有恢复就没有训练 ,也就没有运动能力的提高 ,而恢复实质就是疲劳的消除。因此 ,训练后疲劳的消除就显得尤为重要。科学有效地消除运动性疲劳应从以下几方面着手 :1 静止性体息——睡眠睡眠是消除疲劳恢复体力的一种重要的、不可缺少的好方式… 相似文献
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运动性疲劳是体育训练和竞赛不可回避的问题。了解运动性废劳产生的机制和特点,判断出疲劳的程度,在运动训练过程中注意延缓疲劳的产生及在训练和比赛后采取合理的手段和措施促进疲劳的恢复,对提高训练效果和运动成绩有重要意义。 相似文献
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目的:探讨户外拓展体力活动特征与支链氨基酸代谢关系模型。方法:以一次20人为时4天的户外拓展训练为对象,分为男子组和女子组,通过每天对于不同受试对象的脉搏指数,血压指数,疲劳指数,肺活量指数等影响支链氨基酸代谢过程和代谢程度的量进行监测,构建户外拓展体力活动的过程与支链氨基酸详细代谢关系模型。结果:随着天数增加,男子组脉搏指数明显高于女子组,且稳定性较女子组差,男子组与女子组的血压指数基本相当,男子组疲劳指数高于女子组,肺活量指数高于女子组。结论:通过采用该方法构建的户外拓展体力活动特征与支链氨基酸代谢关系模型,在不同时间内,支链氨基酸的代谢稳定,对于机体持续代谢氧气需求量的稳定性更高,肺活量指数影响支链氨基酸代谢对于男性而言更加明显。分析证明该模型能有效改善脉搏指数,血压指数,疲劳指数,肺活量指数对支链氨基酸代谢过程和代谢程度的影响,为定量分析氨基酸在人体内代谢功能提供数据基础,分析户外拓展体力活动特征与人体正常代谢和生命运作的关系提供理论模型。 相似文献
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散打运动员在长期的训练中身理、心理负荷强度大,神经系统、心血管系统、呼吸系统以及内分泌系统等机能长期处于高度紧张状态,容易产生运动性疲劳。本文试图通过运动性疲劳产生原因的分析,对运动员如何采取合理的膳食补给来减轻疲劳,尽快消除疲劳进行论述。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献