Supporting the Professional Development of Science Teacher Educators Through Shadowing     

Hanuscin  Deborah  Donovan  Deborah  Acevedo-Guti&#;rrez  Alejandro  Borda  Emily  DeBari  Susan  Melton  Josie  Le  Thanh  Morrison  Whitney  Ronca  Roxane 《International Journal of Science and Mathematics Education》2021,19(1):145-165

Despite calls for more attention to the preparation of those who prepare teachers, there have been few examples of institutionally sanctioned and structured learning opportunities created to equip faculty with the knowledge and skills necessary to become effective teacher educators. In this paper, we describe a cross-disciplinary and collaborative initiative that involves shadowing of colleagues as a means of supporting the professional learning of science teacher educators. We illustrate the unique affordance of this model and highlight our professional learning across multiple dimensions: cognitive, practical, relational, and emotional. We illustrate how shadowing can support the learning of faculty at different career stages and from different disciplinary backgrounds and entry points to teacher education through a series of vignettes of shadowing in a variety of course contexts. Finally, we offer considerations for the transferability of our model to other institutions and contexts, and how further research conducted in the context of shadowing could help deepen our understanding of the knowledge base of science teacher educators and how this knowledge is developed.

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Using social networking sites for language learning to develop intercultural competence in language education programs     

José Aldemar Álvarez Valencia  Alejandro Fernández Benavides 《Journal of International and Intercultural Communication》2019,12(1):23-42

This article examines the ways a social networking site for language learning (SNSLL) enhances or hinders intercultural communicative competence (ICC). The study identifies the components of intercultural competence that emerge from students’ interactions and reflections about the SNSLL Livemocha. The research was conducted with second-year students of an English class in a Colombian university. Data were collected through screen recordings, students’ logs, surveys, and a focus group. Findings indicate that, of the five dimensions of ICC, the components of Attitudes, Knowledge, Skills of Interpreting and Relating, and Skills of Discovery and Interaction featured strongly on students’ exchanges and reflections. SNSLLs hold potential to enhance intercultural skills; however, pedagogical adjustment and refocusing of some of their activities are required to expand opportunities for intercultural engagement.  相似文献   

Goal effectiveness after players’ dismissals in professional futsal teams     

Miguel A. Gómez  César Méndez  Alejandro Indaburu  Bruno Travassos 《Journal of sports sciences》2019,37(8):857-863

The purpose of this study was to analyse the effect of players’ dismissals on the outcome of attacks in elite futsal matches, and to establish the performance profile of the attacks made in numerical superiority by elite futsal teams. One hundred and twenty five attacking game situations in numerical superiority (dismissal of opponents from defensive team) were analysed from the regular season of the Spanish professional Futsal League. The effect of contextual-related variables (quality of opposition, match-location, match-periods, opponent team’s fouls, match-status, attack-duration and match-type) on goal effectiveness was analysed using binomial logistic regression and two-step cluster analysis. Results from the binary logistic regression showed that the highest attack effectiveness was achieved when the teams play at home, perform the attack during minutes 33–36 and the opposing team has 3 fouls. Secondly, the two-step cluster analysis technique allowed identifying four types of attacks when the teams were playing with numerical superiority. The results showed the great importance (in order) of match-type, match-status, attacking team’s fouls, match-period, quality of opposition, opposing team’s fouls, match-location, goal situation, and attack duration. The identified trends may help coaches to design the superiority/inferiority scenarios more specifically during training and to monitor them during competition.  相似文献   

Assessing Fat Mass of Adolescent Swimmers Using Anthropometric Equations: A DXA Validation Study     

Gabriel Lozano-Berges  Alejandro Gómez-Bruton  Ángel Matute-Llorente  Cristina Julián-Almárcegui  Alba Gómez-Cabello  Alejandro González-Agüero 《Research quarterly for exercise and sport》2017,88(2):230-236

Purpose: The aim of the present study was to determine which of the published anthropometric equations is the most appropriate to estimate body-fat percentage (BF_%) in adolescent swimmers. Method: Eighty-eight swimmers (45 boys, 43 girls) participated in this study. Following the recommendations of the International Society of the Advancement of Kinanthropometry, biceps, triceps, subscapular, iliac-crest, supraspinale, front-thigh, and medial calf skinfold thicknesses were measured. Waist, hip, midthigh, calf, relaxed arm, and arm flexed and tensed girths were also registered. BF_% was measured with dual-energy X-ray absorptiometry (DXA) to obtain the reference value. Existing anthropometric equations were applied, and BF_% results obtained from anthropometric equations were compared to DXA BF_% results with the modified Bland-Altman. Results: The Flavel, Durnin-Rahaman-Siri, and Durnin-Rahaman-Brozek were the only equations that did not demonstrate statistically significant differences when compared with DXA. Conclusion: The present study showed that the best anthropometric equation from existing literature to estimate BF_% in swimmers is that proposed by Durnin-Rahaman (independently of applying the Siri or Brozek equation).  相似文献   

Reliability and magnitude of mechanical variables assessed from unconstrained and constrained loaded countermovement jumps     

Amador García-Ramos  Slobodan Jaric  Alejandro Pérez-Castilla  Paulino Padial  Belén Feriche 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(4):514-526

This study aimed to (1) assess the reliability of the force, velocity, and power output variables measured by a force plate and a linear velocity transducer (LVT) for both the unconstrained and constrained loaded countermovement jump (CMJ), and (2) examine the effect of both the CMJ type and the measurement method on the magnitudes of the same variables. Twenty-three men were tested on the free CMJ and the CMJ constrained by a Smith machine. Maximum values of force, velocity, and power were recorded by a force plate and by a LVT attached to a bar loaded by 17, 30, 45, 60, and 75 kg. The reliability of all mechanical variables proved to be high (ICC > 0.70; CV < 10%) and similar for two CMJ types. However, force plate-derived measures displayed greater reliability than the LVT. The LVT also markedly overestimated the magnitudes of the mechanical variables, particularly at lower external loads. Therefore, although both jump types and both methods could be acceptable for routine testing, we recommend the force platform due to a higher reliability and more accurate magnitudes of the obtained variables. The unconstrained loaded CMJ could also be recommended due to the simpler equipment needed.  相似文献   

Physical Education Pedagogy: an analysis of research published in Spanish journals (2005–2014)     

Pere Molina  Alejandro Martínez-Baena  Miguel Villamón 《Physical Education & Sport Pedagogy》2017,22(4):378-389

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Development and validation of a method to directly measure the cable force during the hammer throw   总被引：1，自引：0，他引：1  

Brice SM  Ness KF  Rosemond D  Lyons K  Davis M 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(2):274-287

The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force-time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N.  相似文献   

Editorial     

Anne Brice  David Stewart 《Health information and libraries journal》1999,16(4):213-215

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Is possible an eccentric overload in a rotary inertia device? Comparison of force profile in a cylinder-shaped and a cone-shaped axis devices     

F. Javier Núñez  Carlos Galiano  Alejandro Muñoz-López  Pablo Floria 《Journal of sports sciences》2020,38(14):1624-1628

ABSTRACT

The aims of this study were to compare the force profile of using a horizontal cylinder-shaped axis or a vertical cone-shaped axis to provide resistance in rotary inertia devices, and to report the evolution of kinetic and kinematic variables in experienced athletes during a half-squat exercise. Twenty-two healthy active men participated in the assessment of time, peak velocity, peak force, time to reach the peak force, average force, impulse, and range of movement, during a half-squat incremental test performed on conical inertial device (CP) and on cylinder inertial device (YY). The analysis showed that YY during CON-ECC phased generates substantial higher peak_force, mean_force, impulse, time, and a lower peak_velocity, than CP. We never obtained eccentric overload for peak_force or mean_force. CP offers less resistance to accelerate-decelerate the movement with respect to YY, we need checking whether eccentric overload it is being produced, and the impulse was the only kinetic variable that was able to discriminate between the inertias and devices.  相似文献   

The “I” and the “ME” of criminology and criminal justice students: Symbolic interaction in an educational setting     

Melissa Fore Hensarling  Alejandro del Carmen 《Journal of Criminal Justice Education》2013,24(2):351-368

This study examines the self-concept of criminology and criminal justice students, vis-`a-vis the perceptions held of them by non-criminology and criminal justice students, using a framework of symbolic interactionism. The data in this study were obtained from a sample of both criminology and criminal justice students and non-criminology and criminal justice students attending a large state university in north Texas. The findings reveal a lack of consensus among perception patterns held by criminology and criminal justice students and non-criminology and criminal justice students. Implications regarding the future of criminology and criminal justice education follow.  相似文献