Effects of a contrast training programme on jumping,sprinting and agility performance of prepubertal basketball players     

Pedro Ángel Latorre Román  Francisco Javier Villar Macias  Felipe García Pinillos 《Journal of sports sciences》2018,36(7):802-808

The purpose of this study was to examine the effects of a 10 week contrast training (CT) programme (isometric + plyometric) on jumping, sprinting abilities and agility performance in prepubertal basketball players. Fifty-eight children from a basketball academy (age: 8.72 ± 0.97 years; body mass index: 17.22 ± 2.48 kg/m²) successfully completed the study. Participants were randomly assigned to experimental groups (EG, n = 30) and control groups (CG, n = 28). The CT programme was included in the experimental group’s training sessions – twice a week – as part of their usual weekly training regime. This programme included 3 exercises: 1 isometric and 2 plyometric. Jumping, sprinting and agility performance were assessed before and after the training programme. Significant differences were found in posttest between EG and CG in sprint and T-test: EG showed better results than CG. Furthermore, there were significant differences in posttest-pretest between EG and CG in squat jump, countermovement jump, drop jump, sprint and T-test with the EG showing better results than CG. The CT programme led to increases in vertical jump, sprint and agility levels, so that the authors suggest that prepubertal children exhibit high muscular strength trainability.  相似文献   

Effect of contact and no-contact small-sided games on elite handball players     

Antonio Dello Iacono  Domenico Martone  Alessandro Moura Zagatto  Yoav Meckel  Mahmood Sindiani  Mirjana Milic 《Journal of sports sciences》2018,36(1):14-22

This study aimed to investigate the effect of contact (C-SSG) and no-contact (NC-SSG) handball small-sided games (SSGs) on motion patterns and physiological responses of elite handball players. Twelve male handball players performed 10 C-SSG and 10 NC-SSG while being monitored through the heart rate (HR) and rate of perceived exertion (RPE) as physiological responses and time-motion activities profile using video-match analysis. Both game conditions resulted in similar HR responses (P > 0.05), but the NC-SSG led to a higher RPE scores. The time-motion activity analysis featured NC-SSG with a greater amount of walking (855.6 ± 25.1 vs. 690.6 ± 35.2 m) and backward movements (187.5 ± 12.3 vs. 142.5 ± 8.7 m) combined with fast running (232.3 ± 8.5 vs. 159.7 ± 5.7 m) and sprinting (79.5 ± 4.7 vs. 39.7 ± 3.7 m) activities (P < 0.001). Conversely, C-SSG had a higher percentage of jogging and sideway movements associated with greater frequency of jumping (0.87 ± 0.09 vs. 0.31 ± 0.06 nr) and physical contact (1.82 ± 0.55 vs. 0.25 ± 0.03 nr) events (P < 0.001). No between-regimen differences were found for the number of throws (P = 0.745). In addition, the RPE was significantly correlated with fast running relative distances (r = 0.909, P < 0.001) and sprinting relative distances (r = 0.939, P < 0.001). In conclusion, this investigation showed that both C-SSG and NC-SSG in team handball can effectively represent specifically oriented exercises, according to the sport-task and the performance demands.  相似文献   

Swimming and peak bone mineral density: A systematic review and meta-analysis     

Alejandro Gomez-Bruton  Jesús Montero-Marín  Alejandro González-Agüero  Alba Gómez-Cabello  Javier García-Campayo  Luis A. Moreno 《Journal of sports sciences》2018,36(4):365-377

This meta-analysis aims to determine the effects of regular swimming on bone mineral density (BMD) in young adults (18–30 years). A systematic search was performed in Pubmed, SPORTDiscus and the Cochrane Library from the earliest possible year to March 2016. Swimmers were compared to non-athletic controls (CG) and to high-impact athletes (HIGH). Effect sizes with the Hedges g in random effects models were developed. Fourteen studies met the inclusion criteria and were included in the meta-analyses. Swimmers presented similar BMD values to CG in whole-body (g = ?0.20; P = 0.251), femoral neck (g = ?0.05; P = 0.818) and lumbar spine (g = 0.18; P = 0.492); and lower BMD in the whole-body (g = ?1.21; P < 0.001), femoral neck (g = ?1.51; P < 0.001) and lumbar spine (g = ?0.84; P = 0.017) than the HIGH. For the whole-body differences, the higher the latitude the smaller the differences between swimmers and HIGH (B = 0.10; P = 0.001). For the femoral neck differences, age also seemed to reduce the differences between groups (B = 0.19; P = 0.020). Young adult swimmers present similar BMD values than CG and lower values than HIGH.  相似文献   

Teaching methodologies at university and their relationship with the development of transversal competences / Metodologías de enseñanza en la universidad y su relación con el desarrollo de competencias transversales     

Pilar Martínez-Clares 《Cultura y Educación》2018,30(2):233-275

This paper aims to understand the use of different methodologies and their relationship with the development of transversal competencies within higher education. A total of 1,137 final-year undergraduate students from the University of Murcia participated in this study, and the data collection instrument used is the CECTGRA questionnaire designed ad hoc. Among the most noteworthy results is the prevalence of lectures compared with other more active methodologies and the perception that the development of transversal competencies could be improved. A positive correlation is obtained between the use of active methodologies and the successful development of different types of competencies. This work invites reflection on the methodologies used by university teachers to develop transversal competencies and the reconsideration of their educational practice.  相似文献   

Scripts or Components? A Comparative Study of Basic Emotion Knowledge in Roma and Non-Roma Children     

Marta Giménez-Dasí  Laura Quintanilla  Beatriz Lucas-Molina 《Early education and development》2018,29(2):178-191

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Was the Transition to the Performance-based Contract at Vocational Schools in Moscow Region Successful?     

P.V. Derkachev  A.K. Zinovyev 《Russian Education & Society》2018,60(2):161-181

The goal of our study was to compare the working conditions, salary size, and professional outcomes of teachers at schools that switched to the competitive performance-based (so-called ‘effective’) contract in comparison with teachers at schools that did not switch to this employment framework. The study focused on teachers at 83 vocational secondary schools (VSS) that are subordinate to the Ministry of Education of Moscow Region. We conducted an opinion poll to obtain direct information from teachers. We sent questionnaires consisting of 31 questions to 253 teachers. Of the respondents, 105 were included in the experimental group and 148 were placed in the control group. The results of our study show that teachers who work in organizations that have switched to the effective contract model have a higher subjective assessment of their own financial situation, greater expectations regarding their future income, greater confidence about the compensation plan, and a better opinion of the prestige of the teaching profession than teachers at schools that have not adopted an effective contract. The only parameter that cannot be interpreted as an unambiguously positive result is an increase in the frequency of teacher performance assessments at schools that have adopted an effective contract. It was also possible to establish the existence of a moderate relationship between the individual nature of the employment contract and the level of trust that teachers have in their compensation plan. In addition, we established another moderate relationship between informedness and the level of trust that teachers place in their compensation plan. Thus, we can recommend implementing the performance-based contract model at all VSS in the Moscow Region, because it has a positive impact on the immaterial motivation and financial position of teachers. By conducting additional measures to increase teachers’ informedness about effective contracts, we can increase their level of trust in them.  相似文献   

Correlation of Clinical and Histopathological Grades in Oral Submucous Fibrosis Patients with Oxidative Stress Markers in Saliva     

C. V. Divyambika  S. Sathasivasubramanian  G. Vani  A. J. Vanishree  N. Malathi 《Indian journal of clinical biochemistry : IJCB》2018,33(3):348-355

This study aimed to correlate the oxidative stress marker levels in saliva with the clinical stage based on mouth opening, fibrotic bands and histopathological grades of oral submucous fibrosis (OSF) patients. The study included patients clinically diagnosed with OSF (n = 63) and equal number of age and gender matched controls. Patients with OSF were defined by mouth opening stage, fibrotic bands and histopathological grades. Unstimulated saliva from both control and OSF patients were analysed for oxidative markers like lipid peroxides (LPO), non-enzymic antioxidants [reduced glutathione (GSH), vitamin A, vitamin E, vitamin C] and enzymatic antioxidants [glutathione peroxidase (GPx), superoxide dismutase (SOD)] and correlated with different stages and grades. Total salivary protein and LPO were significantly increased in OSF group with no significant change in the levels of GSH compared to controls. In OSF patients, a significant decrease in the levels of vitamins A, C and E was observed. The activities of salivary SOD and GPx were significantly decreased in OSF patients compared to controls. These changes significantly correlated with the increasing and differing grades of OSF that reflects increased oxidative stress with the progress of OSF.  相似文献   

10G以太网与无限宽频技术的广域性能对比     

Negeswara  S.V  Weikuan Yu 《中国教育网络》2009,(1):31-31

对于广域高性能应用程序来说,轻路径提供了10Gbps的连接,并且拥有PIC—E接口的多核主机可以达到这样的速率。然而要在远隔上千英里的主机之间维持这样的高吞吐率是一个很大的挑战,而且目前这方面的性能研究还很有限。我们对两种基于不同技术达到高吞吐率的方案进行了试验研究：（a）基于TCP／IP协议的10Gbps以太网;（b）无限宽频及其扩展。  相似文献   

The effect of the surface functionalization and the electrolyte concentration on the electrical conductance of silica nanochannels     

D. C. Martins  V. Chu  J. P. Conde 《Biomicrofluidics》2013,7(3)

It is known that the conductance of nanochannels as a function of electrolyte concentration deviates from a linearly proportional relationship and approaches a value independent of the concentration as the electrolyte concentration is lowered. Most of the proposed models account for this behavior by considering a constant surface charge density and an ideal electrolyte solution. However, at low electrolyte concentrations, the ideal electrolyte approximation is no longer valid because the ions that result from the atmospheric carbon dioxide dissolution in water dominate the ionic concentration. In this paper, arrays of silica nanochannels were electrically characterized via conductance measurements. The conductance at low salt concentrations is modeled by a variable surface charge model that accounts for all ionic species in solution. This model was used to determine the variable surface charge of the bare silica nanochannels as well as of chemically modified nanochannels. The model correctly predicted the variation of the nanochannel conductance observed after silane (aminopropyldimethylethoxysilane) functionalization and single-strand DNA immobilization. Finally, pH modification of bulk KCl solutions was employed as an alternative method of changing the surface charge of silica nanochannels. Surface charge calculated from conductance measurements performed at different bulk pH values confirmed that the surface charge of the silica nanochannel walls is sensitive to the H⁺ concentration.  相似文献   

Philosophical Kinanthropology: The Meeting Point of Philosophy,Body and Movement [Filosofická kinantropologie: setkání filosofie,te? la a pohybu] By Ivo Jirásek. Published 2005 by Palacký University,Olomouc, Czech Republic.     

Irena Martínková 《体育哲学杂志》2013,40(2):214-216

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