Effects of volleyball match-induced fatigue on knee joint position sense     

Fernando Ribeiro  Fernando Santos  Pedro Gonçalves  José Oliveira 《European Journal of Sport Science》2013,13(6):397-402

Abstract

It has been suggested that a greater number of injuries during the last third of practice sessions or matches could be related to alteration of lower limb neuromuscular control due to neuromuscular fatigue. This fatigue-related effect can be mediated by changes in joint proprioception. In athletes, the use of functional fatigue protocols could have the advantage of mimicking the demands of sporting activity, thus reflecting more specifically the changes in neuromuscular control and proprioception observed in sport settings. The purpose of the present study was to assess the effect of fatigue induced by a volleyball match on knee joint position sense in elite volleyball players. Seventeen female volleyball players aged 18.9±4.2 years from the Portuguese national team volunteered for the study. Knee joint position sense was evaluated by an open kinetic chain technique and active knee positioning, and was reported using absolute, relative, and variable angular errors. Joint position sense measures were obtained before and immediately after a simulated volleyball match of five sets. To ensure that the match was sufficiently intense to induce fatigue, the perceived exertion or exercise intensity was assessed at the end of the match using Borg’ s rating of perceived exertion (RPE) scale. All participants completed the volleyball match (90min duration), reaching or exceeding 15 on the RPE scale (15.59±0.71; range 15–17), equivalent to “hard/heavy work”. After the volleyball match, a significant increase in absolute (2.11°) and relative (1.71°) angular errors was detected. Match-induced fatigue significantly exacerbated the overestimation of the test position. Moreover, the reliability and accuracy in estimating knee angles decreased from rest to the fatigued state, as shown by the increase (264%) in variable error. Our results show that fatigue induced by a volleyball match has a marked effect on knee joint position sense in elite female volleyball players. Knee joint position sense was less accurate and less consistent after the volleyball match. Fatigue induced by a simulated competitive volleyball match resulted in proprioceptive deficits, decreasing sensorimotor system acuity in female volleyball players.  相似文献   

On the development of didactics in Spain and the present-day crisis of the discipline     

Prof. Dr. Fernando Marhuenda  Prof. Dr. Antonio Bolívar 《Zeitschrift für Erziehungswissenschaft》2012,15(3):535-554

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The path to information in the public domain: Official publications in Spain     

Luis Fernando Ramos SimónAuthor Vitae  Iuliana Botezan 《Government Information Quarterly》2010

Official publications are aimed towards editing and spreading the messages created by governments and other bodies of the public domain. At the beginning, the aim of this activity is twofold: on the one hand, fulfilling the principle of publicity of the norms, as it constitutes a basis for the efficiency of those, and, on the other hand, fulfilling a general function of information about the activities of public authorities. As the action of government generalises, this function of communication between those governing and those governed has extended to other fields of activity, thus, free and pay materials, both printed and electronic, are published.  相似文献   

Interactive Cross-Language Document Selection     

Douglas W. Oard  Julio Gonzalo  Mark Sanderson  Fernando López-Ostenero  Jianqiang Wang 《Information Retrieval》2004,7(1-2):205-228

The problem of finding documents written in a language that the searcher cannot read is perhaps the most challenging application of cross-language information retrieval technology. In interactive applications, that task involves at least two steps: (1) the machine locates promising documents in a collection that is larger than the searcher could scan, and (2) the searcher recognizes documents relevant to their intended use from among those nominated by the machine. This article presents the results of experiments designed to explore three techniques for supporting interactive relevance assessment: (1) full machine translation, (2) rapid term-by-term translation, and (3) focused phrase translation. Machine translation was found to better support this task than term-by-term translation, and focused phrase translation further improved recall without an adverse effect on precision. The article concludes with an assessment of the strengths and weaknesses of the evaluation framework used in this study and some remarks on implications of these results for future evaluation campaigns.  相似文献   

Análisis de la interacción ambiental en el aula. Una investigación en el parvulario     

Fernando Hernández  Juana M.a Sancho 《Infancia y Aprendizaje》2013,36(16):111-120

Resumen

En la perspectiva metodológica de la Psicologia Ecológica y en su consideración de la clase como unidad ambiental, el presente artículo hace referenda a una investigación sobre los diferentes modos de ocupación/interacción de dos grupos de parvulario con características diferenáadas (procedencia social y cultural, ubicación del edificio, actitud pedagógica…) con los equipamientos que conforman en entorno-clase.

La ocupación viene definida por (a) el número de desplazamientos que realiza cada alumno, (b) los objetos a los que se dirige y (c) la significación que va unida a cada desplazamiento.

Las conclusiones derivadas de los resultados obtenidos evidencian diferencias entre los dos grupos en relación (1) con el modo de organización de la clase en función de la actitud pedagógica del profesor (2) con el papel que adquiere la maestra por la referencia del 45% de las interacciones que se originan en cada grupo.  相似文献   

Pre-vocational education in Sri Lanka     

T. O. P. Fernando 《Prospects》1974,4(1):72-76

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Search for autonomy in motor task learning in physical education university students     

Juan Antonio Moreno Murcia  José Antonio Vera Lacárcel  Fernando Del Villar Álvarez 《European Journal of Psychology of Education - EJPE》2010,25(1):37-47

The study focused on discovering the influence that an autonomous motor task learning programme had on the improvement of perceived competence, intrinsic regulation, incremental belief and motivational orientations. The study was performed with two groups of participants (n = 22 and n = 20) aged between 19 and 35 years. The instruments used were the incremental factor of the Conceptions of the Nature of Athletic Ability Questionnaire (CNAAQ-2), the Goal Orientation in Exercise Scale (GOES), the intrinsic regulation factor of the Behavioural Regulation in Exercise Questionnaire (BREQ-2), the perceived autonomy factor of the autonomy measurement scale (EMA) and the perceived competence factor of the Motives for Physical Activity Measure Revised Scale (MPAM-R). The questionnaires were handed out over 3 months in a weekly session with pre-test and post-test. The results showed that the use of an autonomy-based teaching programme increased perceived competence, intrinsic motivation, incremental ability belief and task-involving motivational orientation.  相似文献   

Interactive question answering: Is Cross-Language harder than monolingual searching?     

Fernando López-Ostenero  Víctor Peinado  Julio Gonzalo  Felisa Verdejo 《Information processing & management》2008

Is Cross-Language answer finding harder than Monolingual answer finding for users? In this paper we provide initial quantitative and qualitative evidence to answer this question.  相似文献   

The Role of Organisation and Politics in Government Financing of Education. The Effects of ‘Structural Adjustment’ in Latin America     

Fernando Reimers 《比较教育学》1991,27(1):35-51

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Taking into account mainstream economic and political trends, can/should school have a role in developing authentic critical thinking?     

Fernando Hernandez 《Journal of Educational Change》2006,7(3):215-220

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