Influence of leg preference on bilateral muscle activation during cycling     

Carpes FP  Diefenthaeler F  Bini RR  Stefanyshyn DJ  Faria IE  Mota CB 《Journal of sports sciences》2011,29(2):151-159

The purpose of this study was to investigate asymmetry of muscle activation in participants with different levels of experience and performance with cycling. Two separate experiments were conducted, one with nine cyclists and one with nine non-cyclists. The experiments involved incremental maximal and sub-maximal constant load cycling tests. Bilateral surface electromyography (EMG) and gross and net muscle efficiency were assessed. Analyses of variance in mixed linear models and t-tests were conducted. The cyclists in Experiment 1 presented higher gross efficiency (P < 0.05), whereas net efficiency did not differ between the two experiments (21.3 ± 1.4% and 19.8 ± 1.0% for cyclists and non-cyclists, respectively). The electrical muscle activity increased significantly with exercise intensity regardless of leg preference in both experiments. The coefficient of variation of EMG indicated main effects of leg in both experiments. The non-preferred leg of non-cyclists (Experiment 2) presented statistically higher variability of muscle activity in the gastrocnemius medialis and vastus lateralis. Our findings suggest similar electrical muscle activity between legs in both cyclists and non-cyclists regardless of exercise intensity. However, EMG variability was asymmetric and appears to be strongly influenced by exercise intensity for cyclists and non-cyclists, especially during sub-maximal intensity. Neural factors per se do not seem to fully explain previous reports of pedalling asymmetries.  相似文献   

Computer skills of initial teacher education students     

Mercedes Fisher 《Technology, Pedagogy and Education》2013,22(1):109-123

Abstract

A constant challenge for teacher education lies in keeping courses up to date. This article provides a view of the current skills, attitudes, and perceptions regarding computer technology in the classroom from a preservice candidate perspective. The intent of this research is to help foster discussion about how to further develop pre-service educational technology courses that best meet the needs of a continuously evolving and changing student-teacher population in terms of computer technology skills. The primary instrument was a self-assessment survey of the skills, attitudes, and perceptions about utilizing computer technology in the classroom among firsttime students enrolled in introductory education courses at a large midwestern university in the USA in the fall semester of 1999. Surveys were administered to a total of 205 students. Questionnaires were given to preservice teachers during their initial courses rather than mailed to their homes, in an attempt to increase participation rates. Participants were categorized as being either a ‘Beginner’ or ‘Experienced User’ of computer technology, based on their responses to the skill section of the survey. The article includes an overview of the results and segments them as they pertain to three general issues: general attitudes with regards to teaching with computer technology, intended use of computers when beginning to teach, and perceived problems to be expected with computer technology when beginning to teach. Finally, an informal discussion regarding student expectations of future teacher training programs and the corresponding implications for school districts are presented from the free-response section of the questionnaire.  相似文献   

The role of morphological awareness in explaining reading-writing difficulties / El papel de la conciencia morfológica en la explicación de las dificultades de aprendizaje de la lectoescritura     

Mercedes I. Rueda 《Infancia y Aprendizaje》2013,36(4):702-732

Abstract

This paper examines the role played by morphological awareness in explaining difficulties in reading and writing words with arbitrary spelling in a group of students who have reading-writing difficulties. Specifically, the relationship between morphological, morphosyntactic and phonological awareness and reading errors and success in arbitrary spelling is studied. This paper also describes to what extent the morphological and morphosyntactic awareness of students with reading difficulties explains errors in reading and in the correct spelling of words with arbitrary spelling. The results indicate that morphological, morphosyntactic and phonological awareness are related to learning reading and arbitrary spelling in Spanish. However, morphosyntactic awareness is more important in explaining serious reading errors and success in writing with arbitrary spelling among students with reading-writing difficulties.  相似文献   

Las teorías implícitas en el conocimiento social     

M.a José Rodrigo 《Infancia y Aprendizaje》2013,36(31-32):145-156

Resumen

Las teorías del hombre de la calle se analizan utilizando una doble perspectiva, la de la psicología social europea y la del procesamiento de información. La primera se centra en el origen social del conocimiento y analiza el carácter explícito o implícito de las teorías. Por su parte, la perspectiva cognitiva puede aportar conocimientos sobre las propiedades estructurales y funcionales de las teorías implícitas, asimilándolas a esquemas.  相似文献   

El concepto de infancia en nuestra sociedad: una investigación sobre teorías implícitas de los padres     

Beatriz Triana  M.a José Rodrigo 《Infancia y Aprendizaje》2013,36(31-32):157-171

Resumen

Las teorías implícitas que mantienen los padres respecto a sus hijos recibieron un análisis empírico sistemático. Se seleccionaron varias teorías cuyo origen histórico es bien conocido: homúnculo, innatista, ambientalista, voluntarista, constructivista, médica y roussoniana. A partir de diversos estudios normativos se establecieron: a) el dominio de proposiciones de cada teoría; b) su tipicidady polaridad, y c) el grado de estabilidad de tales índices. De modo convergente, se utilizó una técnica cronométrica que halló una relación sistemática entre latencia de verificación, consistencia de juicios de verdad y tipicidad de las proposiciones. Por último, se comprobó la presencia y consistencia de las teorías implícitas en el sistema conceptual de los padres, observándose acusadas preferencias por las teorías constructivista, ambientalista y voluntarista.  相似文献   

Resolution of parent–child conflicts in the adolescence     

Marta García-Ruiz  María José Rodrigo  Juan Andrés Hernández-Cabrera  María Luisa Máiquez  Maja Deković 《European Journal of Psychology of Education - EJPE》2013,28(2):173-188

The aims of the study were: (1) to examine whether adolescents’ attachment and the perceived quality of the communication with their parents relate to effective resolution of parent–child conflicts and (2) to determine whether the pattern of associations changes with adolescents’ gender and age. The sample consisted of 295 adolescents who filled the questionnaires. Structural Equations Models showed that secure attachment predicted a positive communicative climate, which in turn, predicted a more frequent use of negotiation. Secure attachment was related to the use of withdrawal strategies. Anxious attachment was related to high levels of criticism and disputes with parents, which, in turn, predicted the use of all conflict resolution styles. Avoidant attachment was not related to any of the conflict resolution styles. No differences were found in the pattern of associations by gender and age. The relevance of the findings for the social relational perspective to conflict resolution is discussed.  相似文献   

Persisters and nonpersisters: Identifying the characteristics of who stays and who leaves from adult literacy interventions     

Daphne Greenberg  Justin C. Wise  Jan C. Frijters  Robin Morris  Laura D. Fredrick  Victoria Rodrigo  Ryan Hall 《Reading and writing》2013,26(4):495-514

Adult literacy programs are characterized by high attrition rates. Rigorous exploration of student persistence in adult reading classes is lacking. This study was an attempt to understand the profiles of adults who completed reading classes compared to a group of adults who made it to the midpoint and a group of adults who did not make it to the midpoint. Students were offered 100 h of instruction. Of the 395 students who attended the first day of class, only 198 completed the program. Results indicated that English language status, age, some reading related skills, class assignment, avoidance of reading, previous adult education experience, and Women, Infants, and Children (WIC) benefit receipt variables significantly predicted persistence. The significance of some of these predictors varied based on analyzing midpoint completion or full completion. To further explore the characteristics of the sample, the most representative participants were selected from the group that did not make it to midpoint and from the group that completed the program. Results indicated that the most representative members of these two groups differed in English language status, gender, age, some reading related skills, and information access.  相似文献   

Argumentation in Science Teacher Education: The simulated jury as a resource for teaching and learning     

Rodrigo Drumond Vieira  José Roberto da Rocha Bernardo  Maria Evagorou  Viviane Florentino de Melo 《International Journal of Science Education》2013,35(7):1113-1139

In this article, we focus on the contributions that a simulated jury-based activity might have for pre-service teachers, especially for their active participation and learning in teacher education. We observed a teacher educator using a series of simulated juries as teaching resources to help pre-service teachers develop their pedagogical knowledge and their argumentation abilities in a physics teacher methods course. For the purposes of this article, we have selected one simulated jury-based activity, comprising two opposed groups of pre-service teachers that presented aspects that hinder the teachers' development of professional knowledge (against group) and aspects that allow this development (favor group). After the groups’ presentations, a group of judges was formed to evaluate the discussion. We applied a multi-level method for discourse analysis and the results showed that (1) the simulated jury afforded the pre-service teachers to position themselves as active knowledge producers; (2) the teacher acted as ‘animator' of the pre-service teachers' actions, showing responsiveness to the emergence of circumstantial teaching and learning opportunities and (3) the simulated jury culminated in the judges’ identification of the pattern ‘concrete/obstacles–ideological/possibilities' in the groups’ responses, which was elaborated by the teacher for the whole class. Implications from this study include using simulated juries for teaching and learning and for the development of the pre-service teachers’ argumentative abilities. The potential of simulated juries to improve teaching and learning needs to be further explored in order to inform the uses and reflections of this resource in science education.  相似文献   

Estrategias de intervención para la reeducación de niños con dificultades en el aprendizaje de la lectura y de la escritura     

Emilio Sánchez  Mercedes I. Rueda  José Orrantia 《Cultura y Educación》2013,25(3-4):101-111

Son innumerables los textos producidos en nuestro país o traducidos a otros idiomas sobre la etiología y las manifestaciones de los denominados trastornos en el aprendizaje de la lectoescritura en sus diversas variantes. Pero pocas veces se aúnan los esfuerzos de investigadores y clínicos para ofrecer herramientas de tratamiento de estos problemas. Los autores de este artículo han conjugado ambos esfuerzos y ofrecen al lector interesado un diseño para tratar educativamente los problemas lectoescritos.  相似文献   

Muscle force adaptation to changes in upper body position during seated sprint cycling     

Rodrigo Rico Bini  Luke Daly  Michael Kingsley 《Journal of sports sciences》2013,31(19):2270-2278

ABSTRACT

Sprint cycling performance depends upon the balance between muscle and drag forces. This study assessed the influence of upper body position on muscle forces and aerodynamics during seated sprint cycling. Thirteen competitive cyclists attended two sessions. The first session was used to determine handlebar positions to achieve pre-determined hip flexion angles (70–110° in 10° increments) using dynamic bicycle fitting. In the second session, full body kinematics and pedal forces were recorded throughout 2x6-s seated sprints at the pre-determined handlebar positions, and frontal plane images were used to determine the projected frontal area. Leg work, joint work, muscle forces and frontal area were compared at three upper body positions, being optimum (maximum leg work), optimal+10° and optimal-10° of hip flexion. Larger hip (p = 0.01–0.02) and reduced knee (p = 0.02–0.03) contribution to leg work were observed at the optimal+10° position without changes at the ankle joint (p = 0.39). No differences were observed in peak muscle forces across the three body positions (p = 0.06–0.48). Frontal area was reduced at optimum+10° of hip flexion when compared to optimum (p = 0.02) and optimum-10° (p < 0.01). These findings suggest that large changes in upper body position can influence aerodynamics and alter contributions from the knee and hip joints, without influencing peak muscle forces.  相似文献