A comparison of lactate indices during ramp exercise using modelling techniques and conventional methods     

Vincent Thomas  Frédéric Costes  Michel Chatagnon  Jean-Pierre Pouilly 《Journal of sports sciences》2013,31(13):1387-1395

Abstract

The aim of this study was to compare the lactate indices provided by single- and double-breakpoint models with lactate thresholds obtained with conventional methods. Arterial samples for the determination of lactate concentrations were drawn from eight participants at rest and every minute during a ramp test (15 W · min^?1) on a cycle ergometer. Lactate thresholds were determined from a blood lactate concentration equal to 4 mM (LT₄), from an increase of 1 mM above the resting level (Δ1 mM), and from indirect methods using ventilatory parameters. Other indices were computed from the modelling of the lactate curve using an exponential function (LSI), a polynomial function (Dmax), a semi-log model (SLog), a parabola plus delay model (Mod P), and a two-breakpoint model (Mod M). Mod P and Mod M showed poor agreement with the other methods. LT₄, Dmax, LSI, and respiratory exchange ratio equal to 1 were correlated with each other (0.81 ≤ R ≤ 0.92) and their mean differences ranged from 2.8 to 15 W, with limits of agreement within the range ± 24.6 to ± 42.4 W. These results question the interest in breakpoints models to detect lactate thresholds, knowing that LT₄, LSI, Dmax, and respiratory exchange ratio equal to 1 provide indices that occur at similar power outputs.  相似文献   

Key Problems in Organizing and Structuring University Research in Vietnam: The Lack of an Effective Research “Behaviour Formalization” System     

Huong Thi Lan Nguyen  Vincent Lynn Meek 《Minerva》2016,54(1):45-73

Structure and organization seems to be at the root of many of the questions raised about institutional behaviour; however, with respect to research on university capacity building, few studies have examined research organizational problems, particularly in developing countries. This study investigates academic reactions to the structure and organization of research at four leading Vietnamese universities. Through document analysis and semi-structured interviews with 55 participants, the study finds that the four case-study Vietnamese universities have accomplished a number of the more visible tasks of research management such as creating research and research management positions; deciding primary organizational units for research delivery; creating a research office; and creating research oversight committees. However, they seem to neglect the other less visible tasks of organizing and structuring research such as developing rules for research integrity; developing a mechanism for evaluating the quality of research outcomes; preparing researchers and research managers for the necessary skills and knowledge; and deciding vertical and horizontal decentralization. The study concludes that even though research has been formally structured and organized, the management of research has not yet been professionalized. The key problem in organizing and structuring research is the lack of an effective system for research behaviour formalization. A more effective system for better formalizing research behaviours should be developed so that Vietnamese universities can integrate more successfully into the global research.  相似文献   

Correction to: The effects of virtual human gesture frequency and reduced video speed on satisfaction and learning outcomes     

Davis  Robert O.  Wan  Li Li  Vincent  Joseph  Lee  Yong Jik 《Educational technology research and development : ETR & D》2021,69(5):2937-2937

Educational technology research and development - The original publication inadvertently referenced agent persona instead of satisfaction in the title and abstract (lines 11 and 17). The abstract...  相似文献   

Antiviral activities of extracts from Hong Kong seaweeds     

Engchoon Vincent OOI  Put O. ANG Jr. 《Journal of Zhejiang University. Science. B》2008,9(12):969-976

We extracted six Hong Kong brown seaweed species with hot water for their antiviral properties. The cytotoxicity and antiviral activity of these extracts were tested by MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenlytetrezolium bromide] method, cytopathic effect reduction assay, and plaque reduction assay. The antiviral effect was further determined by flow cytometric analysis. The results showed that most of these extracts inhibited the propagation of herpes simplex virus types 1 and 2 (HSV-1 and HSV-2) standard strains with very low cytotoxicity to the host cells. The extracts ofHydroclathrus clathratus and Lobophora variegata showed more potential anti-HSV activities than the extracts of the other four seaweeds. They also had moderate anti-respiratory syncytial virus (RSV) activities but could not inhibit influenza A virus. Hydroclathrus clathratus was further extracted by diluted acid and alkali and the antiviral effects of the extracts were also detected. The result showed that the hot water extract contained the main carbohydrate components that exhibited the antiviral activities against various strains of HSV, including the acyclovir-resistant strain. HI-3, a compound fractionated from this hot water extract, showed a dose-dependent anti-HSV activity in flow cytometric analysis and plaque reduction assay.  相似文献   

Literacy Literacy     

David Vincent 《Interchange》2003,34(2-3):341-357

The paper argues that the term ‘literacy’ has become attached to too many disparate practices, and that renewed attention needs to be paid to how the acquisition and use of skills of written communication are conditioned by the core structures of the home, the classroom, and the state. It reviews the current usages of literacy and examines the agenda for further research in the central areas of reading and particularly writing. Attention is drawn to the contemporary engagement with literacy as a basic skill, and to the recent implementation in England of the “National Literacy Strategy.” The close parallels between the 19th and early 21st century literacy strategies are noted. If historians wish to apply their research to an interrogation of contemporary ideology and practice, greater attention should be paid to domestic instruction and to the role of government over time.  相似文献   

Parenting priorities and pressures: furthering understanding of ‘concerted cultivation’     

Carol Vincent  Claire Maxwell 《Discourse: Studies in the Cultural Politics of Education》2016,37(2):269-281

This paper re-examines the purposes of a planned and intentional parenting style – ‘concerted cultivation’ – for different middle-class groups, highlighting that social class fraction, ethnicity, and also individual family disposition, guides understandings of the purposes of enrolling children in particular enrichment activities. We examine how parents and their children engage in extra-curricular activities for instrumental reasons with a view to securing skills, qualities and distinction for the future. Additionally, however, enrichment activities are understood as offering present-day values such as enjoyment, social bonding and purposeful activity. The paper also highlights that current policy and broader commercial discourses call for the increased responsibilisation and intensification of parenting, which means that ‘good’ parents are required to ‘buy into’ extra-curricular activities for their children, with concomitant implications for those whose access to activities is limited by economic circumstance.  相似文献   

DOES THE SCHOOL COMPOSITION EFFECT MATTER? EVIDENCE FROM BELGIAN DATA   总被引：2，自引：1，他引：1  

Xavier  Dumay  Vincent  Dupriez 《British Journal of Educational Studies》2008,56(4):440-477

ABSTRACT:  Even if the literature on the effects of pupil composition has been extensive, no clear consensus has been reached concerning the significance and magnitude of this effect. The first objective of this article is to estimate the magnitude of the school composition effect in primary schools (6th grade) in French-speaking Belgium. Different indicators of school composition are used: academic, socio-cultural, 'language' and sex composition. Except for sex composition, the results show that the school composition effect explains significant amount of between schools variance even after controlling for pupils' initial performance, socio-cultural background, and non-cognitive dispositions. The second objective is to examine covariance between school composition and several organisational variables and their joint effect on school performance. The second set of analyses is intended to question the conceptual nature of the school composition effect, establishing whether it is direct or indirect.  相似文献   

Theory of Employee Survival     

Vincent J. Natoli 《Performance Improvement Quarterly》2004,17(4):80-94

ABSTRACT This paper presents the Theory of Employee Survival, which states that an applicant's initial attraction and selection into an organization, and an employee's retention and promotion within the organization are dependent on an authoritarianism congruence between the applicant and/or employee, and the employer.  相似文献   

Correction to: Identifying exploration profiles for higher education and their relationship with different student variables and outcomes     

Demulder  Lien  Verschueren  Karine  Lacante  Marlies  Donche  Vincent 《European Journal of Psychology of Education - EJPE》2023,38(3):1145-1163

European Journal of Psychology of Education - This study aims to better understand differences in the decision-making process behind study choices for higher education by investigating the presence...  相似文献   

Lessons from lockdown: Autistic students,parents and mainstream schools     

Carol Vincent  Caroline Oliver  Georgia Pavlopoulou 《British Educational Research Journal》2023,49(3):522-537

This paper reports on the findings of a BERA-funded small-scale project that explores the impacts of COVID-19 lockdowns on the educational experiences of autistic children and young people who attend mainstream schools and their parents/carers in England. We observe that, unsurprisingly, lockdown resulted in associated stresses for families. However, our main argument is that for the participants, the pandemic has not been experienced to the same extent as is popularly understood; that is, causing major disruption to children's schooling experiences and/or unusual levels of social isolation. Using the concept of stigma as a theoretical resource, we argue that this is because the families with whom we spoke were already experiencing, pre-COVID-19, disrupted schooling and degrees of social isolation. Indeed, for many of the young people, the break from school occasioned by lockdown allowed them a release from the more negative and stigmatising aspects of their routine experiences within school. We therefore argue that the disruption of the pandemic sheds light on how stigma shapes students' daily school experiences.  相似文献