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381.
Archila Pablo Antonio Molina Jorge Danies Giovanna de Mejía Anne-Marie Truscott Restrepo Silvia 《Science & Education》2021,30(2):267-291
Science & Education - A well-informed populace is vitally important for the proper functioning of democracy. Media news articles constitute an essential means by which the public comes into... 相似文献
382.
Between Transaction and Transformation: The Role
of School Principals as Education Leaders in Spain 总被引:1,自引:0,他引:1
Spain is, together with Portugal, the only OECD country where school principals are democratically elected from the teaching
staff of each primary and secondary school by a School Council, where all members of the school community are represented.
While this unique feature of the Spanish system entails many promises in terms of deep democracy and, equally important, the potential legitimacy of change promoted by school leaders, the reality seems to be somewhat less
romantic. This paper explores the limitations and constraints faced by school principals in Spain to actually perform their
role as school leaders in primary and secondary schools. Based on a major study that we carried out for the National Institute
for Quality and Evaluation (INCE) in 2002, involving more than 20,000 questionnaires and 30 Focus Groups (with teachers, principals,
school inspectors, administrators, education experts and parents), the paper deals with the impact of leadership on school
improvement and change, especially as far as teaching and learning processes are concerned. Despite their democratic legitimacy,
or perhaps precisely because of its unexpected effects, the elected principal in Spain faces constraints which de facto position
himself or herself between a practice of permanent transaction with colleagues and the mounting pressure of transformation and accountability coming from outside the school. Results from this research suggest that such constraints are determining
that the practice of school leadership in Spain is management and maintenance-oriented rather than change-oriented, thus casting
doubts about the very model of school leadership. 相似文献
383.
Archila Pablo Antonio Molina Jorge de Mejía Anne-Marie Truscott 《Research in Science Education》2020,50(5):1917-1942
Research in Science Education - Contrary to the situation at primary, middle, and secondary school levels, university science courses provide students with very few opportunities to reflect upon... 相似文献
384.
This research has endeavoured to build on earlier research on the relationship between a firm's technological resources and the direction of its diversification, by trying to confirm the endogeneity of this relationship and by addressing the influence of innovation on the choice of the mode of diversification. Based on a sample of Spanish firms, our results suggest that innovation drives diversification, but not the reverse. The second important finding of this research is the empirical confirmation that knowledge assets are not related to the diversification mode. 相似文献
385.
Gennaro Boccia Davide Dardanello Cantor Tarperi Luca Festa Antonio La Torre Barbara Pellegrini 《European Journal of Sport Science》2018,18(5):695-704
Women are known to be less fatigable than men in single-joint exercises, but fatigue induced by running has not been well understood. Here we investigated sex differences in central and peripheral fatigue and in rate of force development (RFD) in the knee extensors after a half-marathon run. Ten male and eight female amateur runners (aged 25–50 years) were evaluated before and immediately after a half-marathon race. Knee extensors forces were obtained under voluntary and electrically evoked isometric contractions. Maximal voluntary isometric contraction (MVC) force and peak RFD were recorded. Electrically doublet stimuli were delivered during the MVC and at rest to calculate the level of voluntary activation and the resting doublet twitch. After the race, decreases in MVC force (males: ?11%, effect size [ES] 0.52; females: ?11% ES 0.33), voluntary activation (males: ?6%, ES 0.87; females: ?4%, ES 0.72), and resting doublet twitch (males: ?6%, ES 0.34; females: ?8%, ES 0.30) were found to be similar between males and females. The decrease in peak RFD was found to be similar between males and females (males: ?14%, ES 0.43; females: ?15%, ES 0.14). Half-marathon run induced both central and peripheral fatigue, without any difference between men and women. The maximal and explosive strength loss was found similar between sexes. Together, these findings do not support the need of sex-specific training interventions to increase the tolerance to neuromuscular fatigue in half-marathoners. 相似文献
386.
Jeffer Eidi Sasaki Jairo Hélio Júnior Joilson Meneguci Sheilla Tribess Moacir Marocolo Júnior Antonio Stabelini Neto 《Journal of sports sciences》2018,36(14):1572-1577
The purpose of the study was to examine the minimum number of monitoring days for reliably estimating physical activity (PA) and sedentary behaviour (SB) from accelerometer data in older adults. Forty-two older adults from a local senior centre participated in this study. Participants wore an ActiGraph wGT3X-BT on the right hip for 7 consecutive days. Accelerometer data were downloaded to a computer and converted to activity count data in 60s epochs. Time spent in SB and different PA intensity categories were estimated with commonly used activity count cut-points. Participants with at least 7 valid days of monitoring (≥10 h.day?1) were included in the analysis. Intraclass correlation coefficients (ICC) were calculated for determining single-day monitoring reliability. The Spearman-Brown prophecy formula was used to estimate the minimum number of monitoring days required for achieving an ICC of 0.80. Single-day ICC values for time spent in SB and PA intensity categories ranged from 0.45 to 0.61. Minimum number of monitoring days required for achieving an ICC of 0.80 ranged from 2.5 to 4.9 days. In this study, a minimum of 5 consecutive days of monitoring was required for reliably estimating SB and PA from accelerometer data in older adults. 相似文献
387.
João Paulo Limongi França Guilherme Mariana Sussi Silva Rômulo Bertuzzi Antonio Herbert Lancha Junior 《Journal of sports sciences》2018,36(20):2327-2332
The main purpose of this study was to investigate if the rs11091046 (A>C) polymorphism in AGTR2 gene is associated with athletic status in top-level athletes from Brazil. Since the AGTR2 gene is located on the X chromosome, the case-control association study was done separately for women and men. The female cohort was composed of 205 athletes and 241 non-athletes, and the male cohort was composed of 419 athletes and 490 non-athletes. We did not identify an association between the C-allele and the endurance phenotype. However, power athletes had a higher frequency of the A-allele. In women, A/A genotype was overrepresented in international-level power group compared with non-athletes or international-level endurance athletes (23.2% vs. 16.6% or 8.8%, respectively; p < 0.05). In men, the A-allele frequency observed in power athletes or international-level power athletes was statistically different from that observed in non-athletes (51.6% or 57.8% vs. 40.4%; p < 0.009). Furthermore, men sprinters with the A-allele showed significantly faster personal best times for the 100 m than those with the C-allele (10.56 ± 0.32 s vs. 10.93 ± 0.49 s; p < 0.02). In conclusion, it was found that the AGTR2 A-allele is a candidate genetic marker for top-level power athletes. 相似文献
388.
This study aimed to investigate the acute effects of two barbell hip thrust-based post-activation potentiation (PAP) protocols on subsequent sprint performance. Using a crossover design, eighteen soccer athletes performed 5 m, 10 m, and 20 m sprints before and 15 s, 4 min, and 8 min after two PAP protocols. The PAP conditioning activities consisted of hip thrust exercises loaded with either 85% 1RM or a load for optimum power development. The resulting 5 m and 10 m sprint performances were impaired at 15 s following both protocols. At 4 min and 8 min, meaningful improvements were observed for the three sprint distances following both of the protocols. Meaningful differences were found when comparing the two PAPs over time: greater impairments in 5 m and 10 m following the 85% of 1 RM protocol after 15 s, and greater improvements in all sprint distances after 4 min and 8 min following the optimum power development protocol. Positive correlations between the hip thrust's 1RM and power values and the overall individual PAP responses were found. This investigation showed that both heavy-loaded and optimum-power hip thrust exercises can induce a PAP response, with the optimum-power development protocol preferred due its higher efficiency. 相似文献
389.
Jos Antonio Salvador-Olivn Gonzalo Marco-Cuenca Rosario Arquero-Avils 《Journal of the Medical Library Association》2021,109(4):561
Objective:Locating systematic reviews is essential for clinicians and researchers when creating or updating reviews and for decision-making in health care. This study aimed to develop a search filter for retrieving systematic reviews that improves upon the performance of the PubMed systematic review search filter.Methods:Search terms were identified from abstracts of reviews published in Cochrane Database of Systematic Reviews and the titles of articles indexed as systematic reviews in PubMed. Both the precision of the candidate terms and the number of systematic reviews retrieved from PubMed were evaluated after excluding the subset of articles retrieved by the PubMed systematic review filter. Terms that achieved a precision greater than 70% and relevant publication types indexed with MeSH terms were included in the filter search strategy.Results:The search strategy used in our filter added specific terms not included in PubMed''s systematic review filter and achieved a 61.3% increase in the number of retrieved articles that are potential systematic reviews. Moreover, it achieved an average precision that is likely greater than 80%.Conclusions:The developed search filter will enable users to identify more systematic reviews from PubMed than the PubMed systematic review filter with high precision. 相似文献
390.
Bruno Follmer Rodolfo André Dellagrana Luis Antonio Pereira de Lima Walter Herzog 《Journal of sports sciences》2017,35(23):2373-2379
Upper-body dynamic and isometric maximum strength are essential components for success in Brazilian jiu-jitsu (BJJ). This study was aimed at analysing strength parameters in the elbow flexor and extensor muscles of BJJ practitioners. Participants (n = 28) performed maximum isometric contractions of elbow flexors and extensors to determine peak torque (PT), rate of force development (RFD), and the torque–angle (T–A) relationship at elbow angles of 45°, 60°, 75°, 90°, 105°, and 120°. Additionally, concentric and eccentric PTs were measured at 1.04 rad·s-1. Student t-test and ANOVA were performed using α = 0.05. Elbow flexors were stronger isometrically (P < 0.001, ES = 1.23) but weaker concentrically (P < 0.05, ES = 0.54) than extensor muscles, possibly because of the extensive grip disputes and pushing of opponents in BJJ. The T–A relationship had an inverted “U”-shape. Torque differences across elbow angles were moderate (ES = 0.62) for the extensor and large (ES = 0.92) for the flexor muscles. Isometric torque was greatest for elbow angles of 105° and 75° and smallest for 45° and 120° for extensor and flexor muscles, respectively. Elbow flexors had a greater RFD than extensors, regardless of elbow angle. The present study provides comprehensive results for elbow muscle strength in BJJ practitioners. 相似文献