W5″ Test: A simple method for measuring mean power output in the bench press exercise     

Julio Tous-Fajardo  Gerard Moras  Sergio Rodríguez-Jiménez  Albert Busquets  Iñigo Mujika 《European Journal of Sport Science》2016,16(8):940-947

The aims of the present study were to assess the validity and reliability of a novel simple test [Five Seconds Power Test (W5″ Test)] for estimating the mean power output during the bench press exercise at different loads, and its sensitivity to detect training-induced changes. Thirty trained young men completed as many repetitions as possible in a time of ≈5?s at 25%, 45%, 65% and 85% of one-repetition maximum (1RM) in two test sessions separated by four days. The number of repetitions, linear displacement of the bar and time needed to complete the test were recorded by two independent testers, and a linear encoder was used as the criterion measure. For each load, the mean power output was calculated in the W5″ Test as mechanical work per time unit and compared with that obtained from the linear encoder. Subsequently, 20 additional subjects (10 training group vs. 10 control group) were assessed before and after completing a seven-week training programme designed to improve maximal power. Results showed that both assessment methods correlated highly in estimating mean power output at different loads (r range: 0.86–0.94; p?R²: 0.78). Good to excellent intra-tester (intraclass correlation coefficient (ICC) range: 0.81–0.97) and excellent inter-tester (ICC range: 0.96–0.99; coefficient of variation range: 2.4–4.1%) reliability was found for all loads. The W5″ Test was shown to be a valid, reliable and sensitive method for measuring mean power output during the bench press exercise in subjects who have previous resistance training experience.  相似文献   

Innovative Training of In-service Teachers for Active Learning: A Short Teacher Development Course Based on Physics Education Research     

Genaro Zavala  Hugo Alarcón  Julio Benegas 《Journal of Science Teacher Education》2007,18(4):559-572

In this contribution we describe a short development course for in-service physics teachers. The course structure and materials are based on the results of educational research, and its main objective is to provide in-service teachers with a first contact with the active learning strategy “Tutorials in Introductory Physics,” developed by the Physics Education Research Group at the University of Washington. The course was organized in a constructivist, active learning environment, so that teachers have first to experience, as regular students, the whole Tutorial sequence of activities: Tutorial pre-test, Tutorial, and Tutorial Homework. After each Tutorial, teachers reflect on, and recognize their own students’ learning difficulties, discussing their teaching experiences with their colleagues in small collaborative groups first and the whole class later. Finally they read and discuss specific Physics Education Research literature, where these learning difficulties have been extensively studied by researchers. At the beginning and at the end of the course the participants were given the conceptual multiple-choice test Force Concept Inventory (FCI). The pre-/post-instruction FCI data were presented as a practical example of the use of a research-based test widely used in educational research and in formative assessment processes designed to improve instruction.  相似文献   

Strategy and factors for success: The Mexican handicraft sector     

Jos de la Paz Hernndez Girn  María Luisa Domínguez Hernndez  M. C. Julio Cesar Jimnez Castaeda 《Performance Improvement》2007,46(8):16-26

This study analyzed the success factors in the Mexican handicraft sector on the basis of marketing strategies. As a result of this work, 23 factors for success that artisans use as marketing strategies were determined. The most important, because it was related to all of the other elements of success, was a pricing strategy oriented to profits. The second most important strategy was to use personal recommendations to promote the products. Product diversification and the information artisans gave to customers were, respectively, the third and fourth strategies.  相似文献   

Environmental correlates of total and domain-specific sedentary behaviour in young people. The UP&DOWN study     

Verónica Cabanas-Sánchez  Rocío Izquierdo-Gómez  Laura García-Cervantes  José Castro-Piñero  Julio Conde-Caveda  Oscar L. Veiga 《European Journal of Sport Science》2019,19(5):696-706

This study investigated the associations between the characteristics of the nearby physical environment with the total and domain-specific leisure-time sedentary behaviour (SB) in young people. The study included 1578 youth (9–18 years) from the UP&DOWN study. Total leisure-time SB was objectively-assessed by accelerometers. Participants self-reported the time spent during leisure-time in different domains of SB (i.e. screen-based, educational-based, social-based, and other-based SB). Information regarding the basic characteristics of the house, the perceived neighbourhood environment, the amount of physical activity facilities, equipment and materials attainable at home, and the media equipment available at home and in the own bedroom was collected. Linear mixed models were performed, including school and city as random effects. The availability of yard was related to lower total SB and time spent surfing the Internet in boys, but not in girls. More favourable perceived neighbourhood environment was associated with lower total SB and time spent playing video games in girls, but not in boys. The amount of physical activity materials at home was negatively associated with screen-based SB, while the availability of a computer in the own bedroom was positively related to the time spent surfing the Internet in boys and girls. The number of televisions at home and having a computer in the own bedroom was associated with lower time in educational-based SB in boys and girls, respectively. Increasing the number of PA materials at home and decreasing the number of TVs at home and the availability of a computer in the bedroom could improve SB profiles of youth.  相似文献   

Effects of adding a weekly eccentric-overload training session on strength and athletic performance in team-handball players     

Rafael Sabido  Javier Botella  Angel Navarro  Julio Tous-Fajardo 《European Journal of Sport Science》2017,17(5):530-538

To investigate the influence of adding a weekly eccentric-overload training (EOT) session in several athletic performance’s tests, 18 team-handball players were assigned either to an EOT (n?=?11) or a Control (n?=?7) group. Both groups continued to perform the same habitual strength training, but the EOT group added one session/week during a 7-week training programme consisting of four sets of eight repetitions for the bilateral half-squat and unilateral lunge exercises. The test battery included handball throwing velocity, maximum dynamic strength (1RM), countermovement jump (CMJ), 20?m sprint, triple hop for distance, and eccentric/concentric power in both the half-squat and lunge exercises. Data were analysed using magnitude-based inferences. Both groups improved their 1RM in the half squat, 20?m sprint time, and CMJ performance to a similar extent, but the EOT group showed a beneficial effect for both right [(42/58/0), possibly positive] and left [(99/1/0), very likely positive] triple hop for distance performance. In addition, the EOT group showed greater power output improvements in both eccentric and concentric phases of the half-squat (difference in percent of change ranging from 6.5% to 22.0%) and lunge exercises (difference in per cent of change ranging from 13.1% to 24.9%). Nevertheless, no group showed changes in handball throwing velocity. Selected variables related to team-handball performance (i.e. functional jumping performance, power output) can be improved by adding a single EOT session per week, highlighting the usefulness of this low-volume/high-intensity training when aiming at optimizing dynamic athletic performance.  相似文献   

The Value of a Multicultural and Critical Pedagogy: Learning Democracy Through Diversity and Dissent     

Julio Cammarota 《Multicultural Perspectives》2013,15(2):62-69

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Islamic glasses from Al-Andalus. Characterisation of materials from a Murcian workshop (12th century AD, Spain)     

Noemí Carmona  María Angeles Villegas  Pedro Jimnez  Julio Navarro  Manuel García-Heras 《Journal of Cultural Heritage》2009,10(3):439-445

Rescue archaeological excavations at an urban glass workshop of the 12th century AD in the city of Murcia (Spain) have provided one of the few evidences of glass production in the ancient Islamic territory of Al-Andalus. This paper reports the results derived from a chemical–physical characterisation study carried out on a representative sample set of glass fragments and industrial debris from that workshop. The main objectives of the research were to contribute to the knowledge of the type of glasses produced and provide some insights into the technology developed to obtain different colours in glasses. The resulting data indicated that both high-magnesia plant ash (HMG) soda-lime-silicate and soda-lime lead-silicate glasses were produced. They also indicated a deep knowledge of glass colouring techniques, which suggests that a careful control over the glass melting processes was achieved. Among others, the occurrence of bulk-coloured silver yellow and copper ruby red transparent glasses prove the skills reached by Murcian glassmakers. These results shed new light on the Islamic glass technology of a geographical area in which, up to now, little compositional and technological data from glass workshops were available.  相似文献   

Digital competence of higher education professor according to DigCompEdu. Statistical research methods with ANOVA between fields of knowledge in different age ranges     

Cabero-Almenara  Julio  Guillén-Gámez  Francisco D.  Ruiz-Palmero  Julio  Palacios-Rodríguez  Antonio 《Education and Information Technologies》2021,26(4):4691-4708

Education and Information Technologies - The tasks of the university educators must be linked to the digital demands posed by the more sophisticated professions of the twenty-first century. Faced...  相似文献   

Taking the Teachers to School! Critical Consciousness Emerging: A Qualitative Exploration of Mexican American Youth’s Social Justice Orientation Development     

Gómez  Rachel F.  Cammarota  Julio 《The Urban Review》2022,54(3):339-366

The Urban Review - Empirical research demonstrates that Chicanx students thrive in an educational setting where Western histories are de-centered, and the core objectives of the curricula are the...  相似文献   

Analysis of the distance covered by Brazilian professional futsal players during official matches     

Murilo José De Oliveira Bueno  Fabio Giuliano Caetano  Tiago Julio Costa Pereira  Nicolau Melo De Souza  Gustavo Damasceno Moreira  FáBIO Yuzo Nakamura 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):230-240

The purpose of this study was to measure and characterise the distances covered by Brazilian professional futsal players. The trajectories of 93 players during five matches were obtained using an automatic tracking method. The distances covered were analysed for different game conditions: over the entire game and during the times when the ball was out of play and in play separately. When the entire game was considered, the results showed that there was a reduction in the total distance covered per minute from the first [median ± IQR (interquartile range): 97.9 ± 16.2 m/min] to the second half (median = 90.3 m/min; IQR = 12.0), and when only the in-play time was considered (first half: 136.6 ± 17.2 m/min; second half: 129.2 ± 16.7 m/min). The percentage of distance covered in the standing and walking velocity range was higher in the second half than in the first when considering the entire game (30.8% and 28.0%, respectively) and during the in-play time (19.3% and 16.2%, respectively). In conclusion, this study verified that futsal players reduced the physical performance during the second half.  相似文献