888 resultados para Joueurs de tennis


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Atout pour la mise en œuvre, atout pour l’évaluation et de manière plus évidente atout pour la motivation, le jeu sérieux se veut une solution pédagogique pertinente dans un contexte d’éducation formel ou informel. Au niveau de la recherche, on peut se questionner quant à la valeur pédagogique d’une telle approche ainsi que sur ses principaux atouts. Dans notre projet, nous nous sommes intéressés plus particulièrement à l’apport du scénario pédagogique dans un jeu sérieux. En utilisant le jeu vidéo Mecanika, développé dans le cadre d’une maîtrise en didactique à l’UQAM et basé sur un questionnaire reconnu permettant d’identifier les conceptions des élèves en mécanique, le Force Concept Inventory (HESTENES et al., 1992), nous tenterons d’extraire l'élément principal du scénario pédagogique afin d’en évaluer l’effet sur l’apprentissage. Notre méthodologie a permis de comparer les performances d’élèves de cinquième secondaire ayant utilisé deux versions différentes du jeu. Dans un premier temps, les résultats obtenus confirment ceux observés par Boucher Genesse qui étaient déjà supérieurs à ceux habituellement cités dans les recherches impliquant le FCI. Nous avons aussi observé qu’il semble exister une relation significative entre le plaisir à jouer et l’apprentissage, ainsi qu’une relation significative entre le nombre d’interactions et la version du jeu sur le gain, ce qui confirme que le jeu produit un effet qui s’ajoute à celui du professeur. La présence d’étoiles dans le jeu original a suscité plus d’actions des élèves que la version orientée simulation qui en est démunie, ce qui semble indiquer que l’utilisation d’un jeu sérieux favorise l’implication des élèves. Cependant, l’absence d’effet significatif associé à la suppression des étoiles indique que la scénarisation n’est peut-être pas la principale cause des apprentissages observés dans le jeu Mecanika. Le choix des autres éléments présents dans chaque tableau doit aussi être considéré. Des recherches futures seraient nécessaires pour mieux comprendre ce qui favorise les apprentissages

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Contiene tablas y gr??ficos de resultados de ejercicios y de entrenamientos. Resumen tomado del autor

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Resumen tomado del autor. Se muestra tabla

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Resumen tomado del autor. Contiene dibujos de los efectos de la pelota seg??n la forma en que se coge la raqueta

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Resumen tomado del autor. Contiene annexo al final del artículo de 'fichas de control', tablas de resultados y esquema

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Resumen tomado del autor. Contiene tablas varias: de resultado, encuesta y gu??a de entrevista

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The purpose of this paper is to investigate how individuals with different characteristics make their choice-decisions when consuming STIGA table tennis blades, which are combinations of various attributes, such as price, control, attack, etc. It is expected that the general trend of choice behavior on this special commodity can be, at least to some extent, revealed. Data were collected using questionnaires sent to registered members of a table tennis club in China. The questionnaires included information and questions about individuals’ monthly income levels, ages, technique styles, etc. A multinomial logit model was then applied to analyze factors determining Chinese consumers’ choice behavior on STIGA table tennis blades. The results indicated that the main element influencing Chinese consumers’ choice of STIGA ping-pong blades was the technique style and other variables did not seem to influence the choice of table tennis blades. These results might be explained by the limited sample size as well as unmeasured and immeasurable factors. Thus, a more extensive research is needed to be conducted in the future.

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Exercise during growth results in biologically important increases in bone mineral content (BMC). The aim of this study was to determine whether the effects of loading were site specific and depended on the maturational stage of the region. BMC and humeral dimensions were determined using DXA and magnetic resonance imaging (MRI) of the loaded and nonloaded arms in 47 competitive female tennis players aged 8-17 years. Periosteal (external) cross-sectional area (CSA), cortical area, medullary area, and the polar second moments of area (Ip, mm4) were calculated at the mid and distal sites in the loaded and nonloaded arms. BMC and I p of the humerus were 11-14% greater in the loaded arm than in the nonloaded arm in prepubertal players and did not increase further in peri- or postpubertal players despite longer duration of loading (both, p < 0.01). The higher BMC was the result of a 7-11% greater cortical area in the prepubertal players due to greater periosteal than medullary expansion at the midhumerus and a greater periosteal expansion alone at the distal humerus. Loading late in puberty resulted in medullary contraction. Growth and the effects of loading are region and surface specific, with periosteal apposition before puberty accounting for the increase in the bone's resistance to torsion and endocortical contraction contributing late in puberty conferring little increase in resistance to torsion. Increasing the bone's rt.osistance to torsion is achieved hy modifying bone shape and mass, not necessarily bone density.

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Introduction
Our goal is to study the effects of tennis practice in pre-pubescent boys on bone remodeling, by means of enzyme activity involved in balance of matrix remodeling (MMP2 and MMP9).
Results
Mineral bone density has been found higher in the dominant arm (P < 0.0001) as well as MMP2 and MMP9 levels in plasma (P < 0.05).
Conclusion
Tennis practice in children increases bone remodeling, which can be assessed by MMP dosage, in addition of densitometry technique.

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Summary : This 'mini-exhibition' arose as an opportunity to showcase recent acquisitions as well as established holdings of significant items of tennis related heritage within the Tennis Australia Heritage Collections. In general, the Collections have two main strengths, and the mini-exhibition was designed to communicate these. The first strength is the ability to show the evolution of tennis technology and practices over time, from the beginnings of modern tennis in the 1860s, to today. This evolution is a result of tennis being influenced by changes in the wider world, such as the Industrial Revolution. The second strength of the Collections is in showing the impact and influence of tennis on society. Many items in the Collections are evidence of the immense and enduring popularity of the sport across the world. The Collections contain many beautiful, rare and fascinating items of decorative arts, fashion, literature and social history which feature tennis as a motif. These items show the reverse influence - the deep impression tennis has made outside of the sport itself.  This mini-exhibition focuses on these two themes. Some displays focus on the first theme. They demonstrate the evolution of tennis racquets, tennis balls, instructional publications and other tennis related equipment over the past century and a half. Other displays focus on the second theme. There are cases which examine tennis' influence upon global popular culture, in board games, fashion and decorative arts from around the world.  The mini-exhibition includes items from the U.s, U.K., Germany, France, Austria, Japan and Australia, demonstrating the global phenomenon that tennis quickly became, and showcasing the international scope of the Collections.  Each case contains text panels listing the objects and their specifications, and panels providing contextual information about the display. The miniexhibition is expected to be on display until November 2009. A case-bycase breakdown of objects, with images and a layout map follows.