Determination of a quantitative parameter to evaluate swimming technique based on the maximal tethered swimming test     

Rafael Soncin  Bruno Mezêncio  Jacielle Carolina Ferreira  Sara Andrade Rodrigues  Rudolf Huebner  Julio Cerca Serrão 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(2):248-257

The aim of this study was to propose a new force parameter, associated with swimmers’ technique and performance. Twelve swimmers performed five repetitions of 25 m sprint crawl and a tethered swimming test with maximal effort. The parameters calculated were: the mean swimming velocity for crawl sprint, the mean propulsive force of the tethered swimming test as well as an oscillation parameter calculated from force fluctuation. The oscillation parameter evaluates the force variation around the mean force during the tethered test as a measure of swimming technique. Two parameters showed significant correlations with swimming velocity: the mean force during the tethered swimming (r = 0.85) and the product of the mean force square root and the oscillation (r = 0.86). However, the intercept coefficient was significantly different from zero only for the mean force, suggesting that although the correlation coefficient of the parameters was similar, part of the mean velocity magnitude that was not associated with the mean force was associated with the product of the mean force square root and the oscillation. Thus, force fluctuation during tethered swimming can be used as a quantitative index of swimmers’ technique.  相似文献   

The application of transformational leadership theory to parenting: questionnaire development and implications for adolescent self-regulatory efficacy and life satisfaction     

Morton KL  Barling J  Rhodes RE  Mâsse LC  Zumbo BD  Beauchamp MR 《运动与训练心理学杂志》2011,33(5):688-709

We draw upon transformational leadership theory to develop an instrument to measure transformational parenting for use with adolescents. First, potential items were generated that were developmentally appropriate and evidence for content validity was provided through the use of focus groups with parents and adolescents. We subsequently provide evidence for several aspects of construct validity of measures derived from the Transformational Parenting Questionnaire (TPQ). Data were collected from 857 adolescents (M(age) = 14.70 years), who rated the behaviors of their mothers and fathers. The results provided support for a second-order measurement model of transformational parenting. In addition, positive relationships between mothers' and fathers' transformational parenting behaviors, adolescents' self-regulatory efficacy for physical activity and healthy eating, and life satisfaction were found. The results of this research support the application of transformational leadership theory to parenting behaviors, as well as the construct validity of measures derived from the TPQ.  相似文献   

On the return of art investment return analyses     

Bruno S. Frey  Reiner Eichenberger 《Journal of Cultural Economics》1995,19(3):207-220

We survey more than twenty studies estimating rates of return of investments in single art objects and whole collections and evaluate the various approaches to art price movements taken so far. The majority of the estimates find lower returns for investments in art objects than for investments in financial assets. However, most existing analyses are restricted to auction data and neglect transactions cost and taxation. They partly focus on mechanistic calculations and disregard the distinguishing institutional and behavioral characteristics of art markets. We look into the possibilities to capture and empirically estimate psychic returns from owning art.  相似文献   

Academic versus industry patenting: An in-depth analysis of what determines patent value     

Elefthrios Sapsalis  Bruno van Pottelsberghe de la Potterie  Ran Navon 《Research Policy》2006,35(10):1631-1645

This paper compares corporate and academic patents and tests whether they have similar value distributions and share common determinants of value. The empirical results based on an in-depth analysis of 400 biotech patents applied for by Belgian universities and firms lead to the following observations: (i) academic and corporate patent value distributions have similar levels of ‘skewness’; (ii) the identification of the institutional origin of knowledge allows for an improved understanding of the value determinants and (iii) there is a need to stimulate star scientists to codify their tacit knowledge into valuable patents.  相似文献   

A study of exploratory behavior as an index of spatial knowledge in hamsters     

Bruno Poucet  Nicole Chapuis  Madeleine Durup  Catherine Thinus-Blanc 《Learning & behavior》1986,14(1):93-100

This experiment investigated the role of exploration in the formation of maps of the environment. The effects of spatial rearrangement of four familiar objects in an open field on subsequent exploratory behavior were studied in hamsters (Mesocricetus auratus). During two exploratory sessions, four groups of subjects were exposed to objects in a particular spatial relation to each other and to a distal pattern. During a testing session, the control group was exposed to the same situation as during the first two sessions, and the three experimental groups were exposed to various object rearrangements. The hamsters in the experimental groups, but not those in the control group, renewed their exploration of the objects during the testing session, as measured by the number of contacts with the objects and the time spent investigating them. Further analyses of the nature of the reinvestigated objects (i.e., displaced or nondisplaced) support the hypothesis that, through exploration, a long-lasting representation of the environment is built up on the basis of the topological relations among the objects, the overall geometric structure provided by the arrangement of the objects, and the relations between the objects and extra-apparatus landmarks.  相似文献   

School Mapping Restructure in China: What role for the small rural school?     

Dan Zhao  Bruno Parolin 《Frontiers of Education in China》2011,6(2):248-278

Despite significant progress over the past fifteen years associated with School Mapping Restructure (SMR) in Chinese rural schools, many small schools have been closed or have merged with larger primary schools. This has resulted, among other things, in difficulties for many students in rural areas who now have to travel longer distances to a central (primary) school and whose families generally have to bear greater expenses for schooling. This paper examines the role of small rural schools in the Chinese education system, looks at the context and impacts of SMR on these schools in terms of quality, cost and access indicators, and highlights some of the key difficulties faced by these schools in the restructured education system. We argue that small rural schools have a significant role to play in delivering education services in rural China and should therefore be retained, supported and equipped with the right levels of facilities and quality services for them to fulfill their role. The policy implications of these findings for education officials are discussed in the context of continuing SMR.  相似文献   

Effects of targeted interventions and of specific instructional time on reading ability in French children in grade 1     

Ecalle  Jean  Magnan  Annie  Auphan  Pauline  Gomes  Christophe  Cros  Laurent  Suchaut  Bruno 《European Journal of Psychology of Education - EJPE》2022,37(3):605-625

European Journal of Psychology of Education - The aim is to examine the impact of interventions on fluency and reading comprehension and how the effects of these interventions depend on the time...  相似文献   

Effects of Population Heterogeneity on Accuracy of DIF Detection     

María Elena Oliveri  Kadriye Ercikan  Bruno D. Zumbo 《教育实用测度》2014,27(4):286-300

Heterogeneity within English language learners (ELLs) groups has been documented. Previous research on differential item functioning (DIF) analyses suggests that accurate DIF detection rates are reduced greatly when groups are heterogeneous. In this simulation study, we investigated the effects of heterogeneity within linguistic (ELL) groups on the accuracy of DIF detection. Heterogeneity within such groups may occur for a myriad of reasons including differential lengths of time residing in English-speaking countries, degrees of exposure to English-speaking environments, and amounts of English instruction. Our findings revealed that at high levels of within-group heterogeneity, DIF detection is at the level of chance, implying that a large proportion of DIF items might remain undetected when assessing heterogeneous populations potentially leading to developing biased tests. Based on our findings, we urge test development organizations to consider heterogeneity within ELL and other heterogeneous focus groups in their routine DIF analyses.  相似文献   

Test–retest reliability of the 30–15 Intermittent Fitness Test: A systematic review     

Jozo Grgic  Bruno Lazinica  Zeljko Pedisic 《运动与健康科学(英文)》2021,10(4):413

PurposeThis review aimed to synthesize previous findings on the test–retest reliability of the 30–15 Intermittent Fitness Test (IFT).MethodsThe literature searches were performed in 8 databases. Studies that examined the test–retest reliability of the 30–15 IFT and presented the intraclass correlation coefficient (ICC) and/or the coefficient of variation (CV) for maximal velocity and/or peak heart rate were included. The consensus-based standards for the selection of health measurement instruments (COSMIN) checklist was used for the assessment of the methodological quality of the included studies.ResultsSeven studies, with a total of 10 study groups, explored reliability of maximal velocity assessed by the 30–15 IFT. ICCs ranged from 0.80 to 0.99, where 70% of ICCs were ≥0.90. CVs for maximal velocity ranged from 1.5% to 6.0%. Six studies, with a total of 7 study groups, explored reliability of peak heart rate as assessed by the 30–15 IFT. ICCs ranged from 0.90 to 0.97 (i.e., all ICCs were ≥0.90). CVs ranged from 0.6% to 4.8%. All included studies were of excellent methodological quality.ConclusionFrom the results of this systematic review, it can be concluded that the 30–15 IFT has excellent test–retest reliability for both maximal velocity and peak heart rate. The test may, therefore, be used as a reliable measure of fitness in research and sports practice.  相似文献   

Consequences of Vertical Separation and Monopoly: Evidence From the Telecom Privatizations     

Bruno E. Viani 《Journal of Media Economics》2013,26(2):70-97

Policy variation across countries on the use of mandatory vertical separation and statutory monopoly allows the assessment of their impact on basic telephone services (local, long distance, and international service). Panel data analysis from 56 countries during the 7-year period following the privatization of the main telephone provider indicates that vertical separation and monopoly harm the consumers that were supposed to benefit: the downstream users of international telephony and the upstream users of residential local telephony. Mandatory vertical separation reduces the usage of international telephone service and the number of fixed lines in service, whereas statutory monopoly reduces the amount of fixed lines in service and increases the price of local residential telephony.  相似文献