Acute cardiovascular responses to interval exercise: A systematic review and meta-analysis     

Kym Joanne Price  Brett Ashley Gordon  Stephen Richard Bird  Amanda Clare Benson 《Journal of sports sciences》2020,38(9):970-984

ABSTRACT

Interval exercise training is increasingly recommended to improve health and fitness; however, it is not known if cardiovascular risk is different from continuous exercise protocols. This systematic review with meta-analyses assessed the effect of a single bout of interval exercise on cardiovascular responses that indicate risk of cardiac fibrillation and infarction compared to continuous exercise. Electronic databases Medline, CINAHL, Embase, Scopus and Cochrane were searched. Key inclusion criteria were: (1) intervals of the same intensity and duration followed by a recovery period and (2) reporting at least one of blood pressure, heart rate variability, arterial stiffness or function. Cochrane Risk of Bias tool and GRADE approach were used. Meta-analyses found that systolic blood pressure responses to interval exercise did not differ from responses to continuous exercise immediately (MD 8 mmHg [95% CI ?32, 47], p = 0.71) or at 60 min following exercise (MD 0 mmHg [95% CI ?2, 1], p = 0.79). However, reductions in diastolic blood pressure and flow-mediated dilation with interval exercise were observed 10–15 min post-exercise. The available evidence indicates that interval exercise does not convey higher cardiovascular risk than continuous exercise. Further investigation is required to establish the safety of interval exercise for clinical populations.  相似文献   

我国高校知识产权信息服务现状、困境及对策     

杜娟娟  张柏秋 《图书情报工作》2019,63(23):44-51

[目的/意义] 知识产权是经济、科技和文化实力的重要体现，已经成为各国竞相争夺的战略性资源。在建设知识产权强国背景下，急需提升高校知识产权信息服务的能力和水平，支撑高校科技创新和"双一流"建设。[方法/过程] 通过对高校知识产权信息服务工作的现状进行分析，总结高校开展知识产权信息服务工作面临的问题，并提出解决对策。[结果/结论] 针对高校知识产权信息服务面临的困境，提出改变科研评价导向，加强知识产权信息资源建设，构建知识产权信息服务标准体系，加大人才培养力度，贯通产学研全链条，有效运用大数据、人工智能技术的建议。  相似文献   

Mapping continuity and change in the intellectual structure of the knowledge base on problem-based learning, 1974–2019: A systematic review     

Philip Hallinger 《British Educational Research Journal》2020,46(6):1423-1444

Problem-based learning (PBL) emerged during the 1970s in response to demands for active learning methods capable of developing transferable knowledge and skills in the training of doctors. Over succeeding decades, PBL was gradually adopted in other fields of education. This systematic review aimed to identify key streams of theory and empirical research that have emerged over time in PBL research and practice. The review sourced 12,036 Scopus-indexed documents published between 1974 and 2019. Science mapping was used to reveal the ‘intellectual structure’ or key research themes that have evolved in this literature over the past 45 years. The science mapping tool used in this review was author co-citation analysis conducted in VOSviewer software. Author co-citation analysis identified three schools of thought that together describe the intellectual structure of the PBL knowledge base: Design of PBL Curriculum and Instruction; PBL Effectiveness; Theory and Practice in Active Learning. In addition to portraying the intellectual structure of the literature as a whole, the review also conducted longitudinal analyses aimed at highlighting structural changes in this field over time. These analyses found that although the size and impact of schools of thought associated with Design of PBL Curriculum and Instruction and PBL Effectiveness increased over time, they remained stable in terms of theoretical foci. However, the Active Learning school evolved from a small school of authors associated with Cognitive Learning Theories prior to 2000 into the largest school of thought during the most recent decades. These findings both reaffirm the theoretical underpinnings of the PBL knowledge base and highlight its increasing integration with other forms of active learning.  相似文献   

Sensemaking and crisis revisited: the failure of sensemaking during the Flint water crisis     

William D. Nowling  Matthew W. Seeger 《Journal of Applied Communication Research》2020,48(2):270-289

ABSTRACT

This study operationalized Weick’s [(1988). Enacted sensemaking in crisis situations. Journal of Management Studies 25(4), 305–317 and (1993). The collapse of sensemaking in organizations: The Mann Gulch disaster. Administrative Science Quarterly, 38, 628–652] theory of enacted sensemaking to examine the communication processes associated with the Flint Water Crisis of 2014–2015. A content analysis of 389 emails and attachments from a total population of N?=?37,376 pages of publicly released e-mails and documents pertaining to Flint’s water issues, identified examples of failed sensemaking by government officials. These failures hastened and intensified a growing crisis of lead contamination and an outbreak of Legionnaires disease associated with Flint’s municipal water system. Analysis of email messages suggests that strong commitments by top leaders and limited capacity were important factors as were efforts to create and maintain consensus among officials. The Flint Water Crisis offers an important application of sensemaking theory and its utility for both organizational and risk communication scholars and for practical application. The authors emphasize the importance of questioning previous assumptions and commitments, insuring that communication practitioners are involved in decisions, and avoiding over reliance on image repair as a strategic response.  相似文献   

Bayesian reasoning in avalanche terrain: a theoretical investigation     

Philip A. Ebert 《Journal of Adventure Education & Outdoor Learning》2019,19(1):84-95

In this article, I explore a Bayesian approach to avalanche decision-making. I motivate this perspective by highlighting a version of the base-rate fallacy and show that a similar pattern applies to decision-making in avalanche-terrain. I then draw out three theoretical lessons from adopting a Bayesian approach and discuss these lessons critically. Lastly, I highlight a number of challenges for avalanche educators when incorporating the Bayesian perspective in their curriculum.  相似文献   

论阎连科《风雅颂》中知识分子的精神迷失     

王静文 《杨凌职业技术学院学报》2020,(1):31-34

阎连科作为当代著名的现实主义作家,他所关注的焦点一直是家乡河南底层农民的苦难与畸形的生活状态。而在《风雅颂》这本著作中,阎连科一转常态,将自己关注的视角对准了高校的知识分子行列,用批判的视角与反讽的手法对当下知识分子精神迷失的现状进行了呈现与反思,具有一定程度的警醒意义。  相似文献   

体育侵权:自甘风险还是过失相抵     

李鼎 《武汉体育学院学报》2020,54(5):56-60

自甘风险和过失相抵是体育侵权案件中最常见的抗辩方式。前者将会免除加害人的赔偿责任,而后者只能按比例减少加害人的赔偿责任。虽然法律后果存在巨大差异,但目前对于体育侵权案件适用自甘风险,还是适用过失相抵,没有一个明确的标准,没有建构一套稳定的规则。从美国法的经验来看,通过对自甘风险进行分类来解决自甘风险和过失相抵的竞合问题,并不是一个成功的范例。实际上,自甘风险和过失相抵的主要区别在于受害人能否认知风险的存在。通过运动类型、违规程度、年龄和精神状况、参与的自愿性、专业程度等五个要素的综合考量,法官可以推知当事人的意思,进而从参加体育活动的行为来判断是否构成自甘风险,最终正确适用法律。  相似文献   

Working as a real estate agent. Bringing the clients in line with the market     

Eliza Benites-Gambirazio 《Journal of Cultural Economy》2020,13(2):153-168

ABSTRACT

Drawing on ethnographic observations and interviews, this paper examines the market work performed by real estate agents in a residential market. The research explores how agents are engaged in market work to sell themselves, the market and the products in order to sell houses. Agents first invest in the clients by self-presentation techniques (likeability, availability, appearance, taste). They also work to bring the clients in line with the market by making them accept the market and its hierarchies; and finally, they enable clients to conform with the market, by relying on prices as signals and taste hierarchies. They act as market devices contributing to market valuation as they are engaged in making residential choices emerge, balancing the cold reality of the market with warm relationships to foster clients' engagement in transactions.  相似文献   

The kid's speech: The effect of stuttering on human capital acquisition     

《Economics of Education Review》2014

A number of studies have shown that childhood speech disorders such as stuttering are associated with lower test scores and educational attainment. However, it is unclear whether these associations are causal in nature or whether they can be explained by difficult-to-measure heterogeneity at the community, family, or individual level. Using data from the National Longitudinal Study of Adolescent Health and ordinary least squares, we show that stuttering is negatively associated with high school grades, the probability of high school graduation, and the probability of college attendance. However, empirical specifications with family fixed effects or controls for learning disabilities such as Attention Deficit Hyperactivity Disorder suggest that these associations can, in large part, be explained by difficult-to-measure heterogeneity.  相似文献   

国家创新能力建设视角下国家图书馆企业信息服务策略研究   总被引：2，自引：1，他引：1  

魏蕊  孙一钢 《图书情报工作》2019,63(16):22-31

[目的/意义]从国家创新能力建设的角度研究国家图书馆企业信息服务，探索其在支持国家创新发展方面的作用。[方法/过程]采用文献调查法、网络调查法、案例分析法和访谈法，首先基于国家创新能力评价体系分析国家创新能力建设驱动的信息服务需求，其次分析英国国家图书馆支持国家创新能力建设的企业信息服务模式，然后调查我国国家图书馆支持国家创新能力建设的实践进展，最后提出其支持国家创新能力建设的企业信息服务策略。[结果/结论]我国国家图书馆支持国家创新能力建设的企业信息服务策略包括开展创新创业知识中心服务模式的研究，探索支持创新创业的企业信息服务模式，并在各地区推广支持地区创新发展的信息服务模式。  相似文献