Comparison of the force-, velocity-, and power-time curves recorded with a force plate and a linear velocity transducer     

Amador García-Ramos  Igor Stirn  Vojko Strojnik  Paulino Padial  Blanca De la Fuente  Javier Argüelles-Cienfuegos 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(3):329-341

This study aimed to correlate, compare, and determine the reliability of force, velocity, and power values collected with a force plate (FP) and a linear transducer during loaded jumps. Twenty-three swimmers performed an incremental loading test at 25, 50, 75, and 100% of their own body weight on a FP. A linear velocity transducer (LVT) was attached to the bar to assess the peak and the mean values of force, velocity, and power. Both the peak variables (r = 0.94 – 0.99 for peak force, r = 0.83 – 0.91 for peak velocity, and r = 0.90–0.94 for peak power; p < 0.001) and the mean variables (r = 0.96–0.99 for mean force, r = 0.87–0.89 for mean velocity, and r = 0.93–0.96 for mean power; p < 0.001) were strongly correlated between both measurement tools. Differences in the shape of the force-, velocity-, and power-time curves were observed. The LVT data showed a steeper increase in these variables at the beginning of the movement, while the FP recorded larger values in the latter part. Peak values were more reliable than mean values. These results suggest that the LVT is a valid tool for the assessment of loaded squat jump.  相似文献   

Effect of defence response time during lunge in foil fencing     

Carmen Gutiérrez-Cruz  F. Javier Rojas  Marcos Gutiérrez-Davila 《Journal of sports sciences》2016,34(7):651-657

The aim of this study was to analyse the effect of stimulus change timing on reaction response time parameters, horizontal velocity of the centre of mass (CM) and precision during offensive actions in fencing. Twelve fencers from the Spanish National Foil Team were included in the study. Two 500 Hz force plates were used to register the horizontal component of the reaction force while a 3D video camera set at 250 Hz recorded the spatial position of 11 body markers and a projector connected to a programmed stopwatch projected a moving target (stimulus) on a screen. When the circle (target) appeared in the centre of the plastron, fencers had to execute a step-forward-lunge as fast as possible, trying to touch the circle with the tip of the foil. During the lunge, the position of the target could randomly shift or not to three different positions. The stimulus change was performed randomly at four different times with a progressive delay. The results show that target changes did not have any effect when they occurred at the beginning of the movement sequence. However, when the target change was delayed, reaction and movement times increased and the technical execution of the lunge changed, leading to more errors.  相似文献   

Feasibility and students' preliminary views on parkour in a group of primary school children     

Javier Fernández-Río  Carlos Suarez 《Physical Education & Sport Pedagogy》2016,21(3):281-294

Background: Adventure education is an instructional model where students participate in adventurous activities to acquire physical, cognitive, and affective skills. It also has strong connections with cooperative learning. Parkour is a fast-growing sport practiced by thousands of youngsters all over the world. The media does not portray it as an educational content, but resourcefulness, maturity, cooperation, and respect are among its basic principles. It also appears to have a direct connection with risk-taking, self-discipline, and autonomy.

Purpose: The purpose of this paper is to assess students' ideas, views, and/or feelings after experiencing a parkour learning unit.

Participants and settings: The research project was conducted in an intact, sixth-grade physical education class in an elementary school located in the northern part of Spain. A total of 26 students with ages ranging between 11 and 12 years (mean age 11.4?±?0.6) participated in the study. There were 14 boys and 12 girls.

Data collection: At the end of the intervention programme, all participating students were asked to ‘Describe your feelings, your thoughts, and your ideas on the parkour learning unit that you just experience in physical education'.

Data analysis: MAXQDA 11, a qualitative software package, was used to assist with data management. All participants' answers were analysed via thematic content analysis and constant comparison.

Findings: Five major categories emerged from data analysis: enjoyment, fear, social skills, problem-solving skills, and integration. Our findings agree with previous researchers who believe that parkour could be considered an educational content due to all the different positive outcomes that it brings to the physical education class. It seems to promote the development of social and problem-solving skills in the students. Both are competences that should be encouraged and fostered in our youngsters. Furthermore, it is considered a fun activity, it promotes students' integration, and it teaches them how to cope with fear.

Conclusion: In contrast to popular views portrayed by the media, the sport of parkour can be a safe, educational content. School cannot turn its back on sports or contents whose popularity is rapidly increasing.  相似文献   

Validity and reliability of a low-cost digital dynamometer for measuring isometric strength of lower limb     

Natalia Romero-Franco  Pedro Jiménez-Reyes  Juan A. Montaño-Munuera 《Journal of sports sciences》2017,35(22):2179-2184

Lower limb isometric strength is a key parameter to monitor the training process or recognise muscle weakness and injury risk. However, valid and reliable methods to evaluate it often require high-cost tools. The aim of this study was to analyse the concurrent validity and reliability of a low-cost digital dynamometer for measuring isometric strength in lower limb. Eleven physically active and healthy participants performed maximal isometric strength for: flexion and extension of ankle, flexion and extension of knee, flexion, extension, adduction, abduction, internal and external rotation of hip. Data obtained by the digital dynamometer were compared with the isokinetic dynamometer to examine its concurrent validity. Data obtained by the digital dynamometer from 2 different evaluators and 2 different sessions were compared to examine its inter-rater and intra-rater reliability. Intra-class correlation (ICC) for validity was excellent in every movement (ICC > 0.9). Intra and inter-tester reliability was excellent for all the movements assessed (ICC > 0.75). The low-cost digital dynamometer demonstrated strong concurrent validity and excellent intra and inter-tester reliability for assessing isometric strength in the main lower limb movements.  相似文献   

Integration,Diversity and the Making of a European Public Sphere,by Hakan G. Sicakkan (Ed.)     

Javier Ruiz-Soler 《Mass Communication and Society》2018,21(2):269-271

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A questionnaire on mathematics learning strategies (CEAMA): measurement and properties of an adaptation into Spanish / Cuestionario de Estrategias de Aprendizaje para las Matemáticas (CEAMA): medida y propiedades de una adaptación en lengua castellana     

Javier Gasco-Txabarri  Iker Ros  Alfredo Goñi 《Cultura y Educación》2017,29(1):183-209

Learning strategies are an essential tool to enable the autonomous and active learning of mathematics and it is therefore necessary to identify these strategies correctly. The objective of this research is to analyse the factorial structure of the Spanish version of a questionnaire that measures the use of these strategies in the subject of mathematics (Cuestionario de Estrategias de Aprendizaje para las Matemáticas [CEAMA]). We adapt a questionnaire based on the MSLQ (Motivated Strategy for Learning Questionnaire), since it is focused on the context of mathematics learning. The study has been conducted in different schools located in the Basque Country and collects data from 631 students of the second, third and fourth years of compulsory secondary education (ESO). The results show a hepta-scale structure compared to the six-scale structure proposed by the original English version. The difference is detected in the division of metacognitive strategies into two factors: planning and monitoring/regulation. This finding improves data on metacognition in mathematics teaching and learning, making it richer and more exhaustive. The suitability of certain items is discussed.  相似文献   

Placing Immigrant and Minority Family and Community Members at the School's Centre: the role of community participation     

Javier Díez  Suzanne Gatt  Sandra Racionero 《European Journal of Education》2011,46(2):184-196

Schools alone cannot reverse the high rates of school failure in the poorest communities in Europe; they need the contributions of the entire community. Coordination between families, the larger community, and the school has proven crucial to enhance student learning and achievement, especially for minority and disadvantaged families. However, families from such backgrounds often participate in their schools only peripherally because the schools take a ‘tourist’ approach, call parents to inform them about school projects and teachers' programmes, or consult them about decisions to be made by professionals, rather than engaging them in their children's education. In contrast, the INCLUD-ED project studied schools across Europe whose students are culturally diverse and from low SES backgrounds; here, the communities are deeply involved in the schools and the students do well academically. This article focuses on three strategies used by these successful schools to engage immigrant and minority community members in more active, decisive, and intellectual ways and thus have greater impact on the school and the students' learning. It also describes some specific practices of involvement grounded in those strategies and the improvements they generate. Though the schools studied use different practices, the three strategies have been found to contribute to a transformative result in all schools: moving minority and disadvantaged families from the periphery of school participation to the centre.

相似文献   

Interactive Self-Assessment Test for Improving and Evaluating Information Competence     

María Pinto  Javier García-Marco  Dora Sales  Jos Antonio Cordn 《The Journal of Academic Librarianship》2010,36(6):526

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Reduction of disruptive behaviors using an intervention based on the Good Behavior Game and the Say‐Do‐Report Correspondence     

Rosario Ruiz‐Olivares  M. José Pino  Javier Herruzo 《Psychology in the schools》2010,47(10):1046-1058

Disruptive behavior can waste a great deal of teaching time in the classroom, leading to feelings of frustration in teachers and an increase in academic failure among pupils. Prior research indicates that intervening in these kinds of behaviors improves the classroom atmosphere and facilitates the learning process. With this in mind, the aims of this article are to (a) reduce the incidence of disruptive behaviors such as standing up without the teacher's permission, shouting, fighting, and interrupting the teacher or a fellow classmate, using a combination of the Good Behavior Game (GBG) and Say‐Do‐Report (S‐D‐R) Correspondence training; (b) achieve long‐term maintenance of results following the gradual withdrawal of the intervention; and (c) introduce the GBG in a different educational context than those discussed so far in the empirical literature. The intervention took place with the 15 children of a standard primary classroom (Cycle 1) at a state‐run school in Andalusia (Spain). Using a multiple baseline design across situations, the GBG and Say not‐not Do‐Request not (Sn‐nD‐Rn) Correspondence training were introduced. A significant reduction in the incidence of disruptive behavior was observed, contingent on the respective application of the intervention in each baseline. The combined application of the GBG and the S‐D‐R Correspondence proved to be an effective way of decreasing disruptive behaviors (shouting, interrupting, etc.) in the classroom, and the results were maintained for 1 year following the gradual withdrawal of the treatment. © 2010 Wiley Periodicals, Inc.  相似文献   

Activity profile of top-class association football referees in relation to fitness-test performance and match standard   总被引：1，自引：1，他引：0  

Mallo J  Navarro E  Aranda JM  Helsen WF 《Journal of sports sciences》2009,27(1):9-17

The aim of this study was to examine the kinematic activity profiles, cardiovascular responses and physical fitness of top-class football referees (n=11) during the FIFA Confederations Cup 2005. Computerised match-analyses (n=9) were performed with a two-dimensional photogrammetric video system, and the cardiovascular demand imposed on the referees (n=12) was measured using heart rate recordings. Total distance covered was 10,218, s=643 m of which 3531, s=510 m was covered at high intensities (>3.6 m.s(-1)). Both total distance covered (r2=0.59; P=0.02) and high-intensity activities (r2=0.44; P=0.05) were related to the distance covered by the ball in the same match. The referees ran at high speed 37% further (P=0.01) in the actual tournament than during under-17 top-level officiating. After the 5-min interval during which high-speed running peaked, in the following 5 min the performance was reduced by 19% (P=0.01) in relation to the mean of the game. Mean heart rate was 161, s=9 b.min(-1) (86, s=3% of maximal heart rate (HRmax)). Mean heart rate (expressed as percentage of HRmax) was related in part (r2=0.36; P<0.01) to the number of high-intensity activities performed in the same 5-min interval. The results of this study show that: (1) kinematic activity profiles of top-class referees can be influenced by the distance covered by the ball; (2) the amount of high-speed running (>5 m.s(-1)) best describes the physical performance of referees; (3) heart rate recording can be a useful tool to determine the most intense periods of a match and (4) the new fitness tests adopted by FIFA were poor predictors of match activities.  相似文献