23 research outputs found
Configurations de jeu dâĂ©quipes de hockey sur glace de niveau Pee Wee et Bantam
Plusieurs approches dâenseignement efficaces en sport compĂ©titif se fondent sur lâobservation et la prise de dĂ©cisions en situation de jeu. Des travaux rĂ©cents issus de la technologie des APSA se sont intĂ©ressĂ©s aux configurations de jeu qui dĂ©crivent les caractĂ©ristiques des sports collectifs, particuliĂšrement les sports interpĂ©nĂ©trĂ©s. Lâobjectif de cette Ă©tude est de dĂ©crire les configurations de jeu prototypiques au hockey sur glace. 17 parties de hockey sur glace dâĂ©quipes de catĂ©gorie Pee Wee (11-12 ans) et Bantam (13-14 ans) ont Ă©tĂ© analysĂ©es et 1306 situations ont Ă©tĂ© codĂ©es. Parmi celles-ci, 13 configurations ont Ă©tĂ© rĂ©pertoriĂ©es et nous indiquent lâimportance des rampes et de la zone offensive dans les rĂ©cupĂ©rations de la rondelle avant un tir au but. Quelques diffĂ©rences entre les joueurs plus jeunes et les plus vieux dĂ©montrent que les joueurs expĂ©rimentĂ©s font des choix davantage appropriĂ©s pour conserver la rondelle que les plus jeunes. Cette description de ce qui se dĂ©roule lors de rencontres de hockey sur glace nâa jamais Ă©tĂ© menĂ©e auparavant. Cette premiĂšre Ă©tape descriptive pourra servir de point de rĂ©fĂ©rence Ă dâautres Ă©tudes plus dĂ©taillĂ©es sur les diffĂ©rentes configurations de jeu au hockey sur glace.Several approaches to effective teaching in competitive sport are based on observation and decision making in real game situations. Recent studies using the technology of APSA were interested in the game settings that describe the characteristics of invasion sports. The objective of this study was to describe some prototypical game settings of ice hockey. A total of 17 ice hockey games of the Pee Wee (11-12 years old) and Bantam (13-14 years old) categories were analyzed. From those games, 1306 cases were coded. Of these, 13 prototypical configurations were been identified. Results showed the importance of the boards and the offensive zone for recovering the puck before a shot on goal. Some differences between younger players and more experienced players showed that older players seemed to make more appropriate choices to collectively keep the puck instead of taking poor shots on goal. This first description may serve as a benchmark for other more detailed studies on the different configurations of play in ice hockey
âYou have 60 minutes to do what you canât do in real life. You can be violentâ: young athletesâ perceptions of violence in sport
Various forms of violence against youth are documented in sport. To date, young athletesâ perceptions of violence in sport remain relatively unstudied. The objective of this study was to examine how violence and its various manifestations in sport have been understood by young athletes. In total, 60 athletes from a variety of sports and ages (12â17âyears old) participated in nine semi-structured focus groups. The interview data were submitted to a thematic analysis using NVivo. Results obtained showed that various motivations for participating in sport influenced the ways in which young athletes addressed violence in this context. Additionally, the findings showed that violence in sport is a concept that young athletes partially understand. Even if most of them described various forms of violence in sport, some forms were misunderstood or have not been addressed at all. Finally, young athletes provided their own explanations of this issue in sport. From their perspective, violence in sport can be seen as part of the sport, a strategy to achieve competitive success on the field, a protective mechanism or a result of the valorisation of violence in sport by peers, parents, coaches and sport organisations. Considering that some young athletes normalised violence in sport, it seems crucial to make prevention efforts targeting social norms in sport
The incidence and types of physical contact associated with body checking regulation experience in 13â14 year old Ice Hockey players
Background: Ice hockey has one of the highest sport participation and injury rates in youth in Canada. Body checking (BC) is the predominant mechanism of injury in leagues in which it is permitted. The objectives of this study were to determine whether the incidence and types of physical contact differ for Bantam players (aged 13â14 years) who were exposed to BC at Pee Wee level (aged 11â12 years) in Calgary, Alberta versus Bantam players who were not exposed to BC at Pee Wee level in QuĂ©bec City, QuĂ©bec. All teams were exposed to BC at bantam level; Methods: A cohort study was conducted in QuĂ©bec City and Calgary. Sixteen games for Calgary and 15 for QuĂ©bec City were randomly selected and analysed with a validated observation system to quantify five intensities of physical contact and to observe different types of physical contact such as slashing and holding; Results: A total of 5610 incidences of physical contact with the trunk and 3429 other types of physical contact were observed. Very light intensity trunk contact was more frequent in Calgary (adjusted incidence RR (ARR): 1.71; 95% CI: 1.28â2.29). Holding (ARR: 1.04; 95% CI: 1.02â1.07) and slashing (ARR: 1.38; 95% CI: 1.07â1.77) were more frequent in Calgary; Conclusion: Results suggest that playersâ physical contacts differ between Bantam leagues in which BC was permitted at Pee Wee level and leagues in which it was not permitted until Bantam level. View Full-Tex
Development and initial factor validation of the French Conformity to the Sport Ethic Scale (CSES)
A pair of Sub-Neptunes transiting the bright K-dwarf TOI-1064 characterised with CHEOPS
Funding: TGW, ACC, and KH acknowledge support from STFC consolidated grant numbers ST/R000824/1 and ST/V000861/1, and UKSA grant ST/R003203/1.We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometry, the High Accuracy Radial velocity Planet Searcher (HARPS) high-resolution spectroscopy, and Gemini speckle imaging. We characterize the host star and determine Teff,â=4734±67Kâ , Râ=0.726±0.007Rââ , and Mâ=0.748±0.032Mââ . We present a novel detrending method based on point spread function shape-change modelling and demonstrate its suitability to correct flux variations in CHEOPS data. We confirm the planetary nature of both bodies and find that TOI-1064 b has an orbital period of Pb = 6.44387 ± 0.00003 d, a radius of Rb = 2.59 ± 0.04 Râ, and a mass of Mb=13.5+1.7â1.8 Mâ, whilst TOI-1064 c has an orbital period of Pc=12.22657+0.00005â0.00004 d, a radius of Rc = 2.65 ± 0.04 Râ, and a 3Ï upper mass limit of 8.5 Mâ. From the high-precision photometry we obtain radius uncertainties of âŒ1.6 per cent, allowing us to conduct internal structure and atmospheric escape modelling. TOI-1064 b is one of the densest, well-characterized sub-Neptunes, with a tenuous atmosphere that can be explained by the loss of a primordial envelope following migration through the protoplanetary disc. It is likely that TOI-1064 c has an extended atmosphere due to the tentative low density, however further radial velocities are needed to confirm this scenario and the similar radii, different masses nature of this system. The high-precision data and modelling of TOI-1064 b are important for planets in this region of massâradius space, and it allow us to identify a trend in bulk densityâstellar metallicity for massive sub-Neptunes that may hint at the formation of this population of planets.Publisher PDFPeer reviewe
Comparaison de la performance de joueurs de catégorie peewee évoluant avec et sans la mise en échec corporelle au hockey sur glace
Depuis de nombreuses annĂ©es, lâintroduction de la mise en Ă©chec corporelle (MĂC) dans le hockey mineur anime plusieurs discussions au sein de la population canadienne. Plusieurs Ă©tudes ont dĂ©montrĂ© que le risque de blessures est plus Ă©levĂ© dans des ligues de catĂ©gorie peewee Ă©voluant avec la MĂC contrairement Ă celles Ă©voluant sans la MĂC. En revanche, rares sont les Ă©tudes qui ont mis au centre de leur rĂ©flexion son impact sur le dĂ©veloppement global des joueurs. Lâobjectif de cette Ă©tude est de comparer, grĂące au Team Sport Assessment Procedure adaptĂ© au hockey sur glace, la performance offensive des joueurs peewee Ă©voluant avec la MĂC (Calgary) et sans la MĂC (QuĂ©bec). Les actions rĂ©alisĂ©es en possession de la rondelle ont Ă©tĂ© comptabilisĂ©es pour 280 joueurs de QuĂ©bec et 272 joueurs de Calgary. Les rĂ©sultats des rĂ©gressions de Poisson dĂ©montrent que peu de diffĂ©rences significatives ont Ă©tĂ© obtenues entre la performance des joueurs de ces deux cohortes pour les variables Ă©tudiĂ©es.The practice of body-checking (BC) in minor hockey has sparked a lengthy series of debates among Canadians. Recent studies have shown that players are at much greater risk for injury in leagues that allow BC compared to those that do not. However, few studies have examined the impact of BC on the offensive development of peewee players (aged 11â12 years). The purpose of this study was to compare the offensive performance of peewee players that practice BC (Calgary) or not (Quebec City) using the Team Sport Assessment Procedure adapted for hockey. A total of 280 players in Quebec City and 272 equivalent-level players in Calgary were videotaped handling the puck in competitive play during the 2007â2008 season. Poisson regression results for the variables and performance indexes indicate no significant differences in offensive performance between players who used BC or not. Expert opinions that introducing BC at a young age can improve overall development of hockey skills are therefore not supported
Configurations de jeu dâĂ©quipes de hockey sur glace de niveau Pee Wee et Bantam
Plusieurs approches dâenseignement efficaces en sport compĂ©titif se fondent sur lâobservation et la prise de dĂ©cisions en situation de jeu. Des travaux rĂ©cents issus de la technologie des APSA se sont intĂ©ressĂ©s aux configurations de jeu qui dĂ©crivent les caractĂ©ristiques des sports collectifs, particuliĂšrement les sports interpĂ©nĂ©trĂ©s. Lâobjectif de cette Ă©tude est de dĂ©crire les configurations de jeu prototypiques au hockey sur glace. 17 parties de hockey sur glace dâĂ©quipes de catĂ©gorie Pee Wee (11-12 ans) et Bantam (13-14 ans) ont Ă©tĂ© analysĂ©es et 1306 situations ont Ă©tĂ© codĂ©es. Parmi celles-ci, 13 configurations ont Ă©tĂ© rĂ©pertoriĂ©es et nous indiquent lâimportance des rampes et de la zone offensive dans les rĂ©cupĂ©rations de la rondelle avant un tir au but. Quelques diffĂ©rences entre les joueurs plus jeunes et les plus vieux dĂ©montrent que les joueurs expĂ©rimentĂ©s font des choix davantage appropriĂ©s pour conserver la rondelle que les plus jeunes. Cette description de ce qui se dĂ©roule lors de rencontres de hockey sur glace nâa jamais Ă©tĂ© menĂ©e auparavant. Cette premiĂšre Ă©tape descriptive pourra servir de point de rĂ©fĂ©rence Ă dâautres Ă©tudes plus dĂ©taillĂ©es sur les diffĂ©rentes configurations de jeu au hockey sur glace. Mots clĂ©s : hockey sur glace; configurations de jeu; espace de jeu effectif; configurations prototypiques; sports interpĂ©nĂ©trĂ©s. (rĂ©sumĂ© d'auteur
Savoirs collectifs, intelligence tactique et hockey sur glace
Le potentiel Ă©ducatif du hockey sur glace est indĂ©niable, particuliĂšrement dans un contexte de programmes scolaires spĂ©cifiques et intensifs comme les programmes sports-Ă©tudes ou les concentrations sport. Ces programmes permettent aux Ă©lĂšves de parfaire leur dĂ©veloppement, amorcĂ© bien souvent dans le sport civil, tout en conciliant leur formation acadĂ©mique. Pour ces programmes scolaires, lâutilisation dâune approche fondĂ©e principalement sur la comprĂ©hension du jeu devient une alternative im..
DiffĂ©rences dans les configurations de jeu dâĂ©quipes de hockey sur glace de catĂ©gorie Pee-Wee et Bantam Ă©voluant avec et sans la mise en Ă©chec corporelle
La mise en Ă©chec corporelle (MĂC) est une tactique dĂ©fensive utilisĂ©e au hockey sur glace et la principale source de blessures des athlĂštes. Au Canada, la MĂC Ă©tait, au moment de lâĂ©tude, permise dĂšs lâĂąge de 11 ans pour les niveaux compĂ©titifs, sauf au QuĂ©bec oĂč elle ne lâĂ©tait quâĂ partir de 13 ans. Aucune Ă©tude sur les diffĂ©rences de jeu nâa pu dĂ©montrer les avantages dâutiliser tĂŽt la MĂC, autant pour lâapprentissage des habiletĂ©s des joueurs que pour les performances. Quatre parties de catĂ©gorie Pee-Wee (11-12 ans) de la rĂ©gion de Calgary (sans MĂC) et cinq de QuĂ©bec (avec MĂC) ont Ă©tĂ© analysĂ©es, de mĂȘme que huit rencontres dans la catĂ©gorie Bantam (13-14 ans), dans laquelle la MĂC est autorisĂ©e dans les deux provinces, quatre de la rĂ©gion de Calgary et autant dans celle de QuĂ©bec. Au final, 1306 configurations de jeu ont Ă©tĂ© codĂ©es. Peu de diffĂ©rences significatives ont Ă©tĂ© constatĂ©es entre les Ă©quipes qui Ă©voluent sans la MĂC et celles Ă©voluant avec. Par ailleurs, la majoritĂ© des diffĂ©rences significatives que nous avons constatĂ©es correspondent Ă un Ă©cart entre le championnat Pee Wee de Calgary et les championnats Bantam, de Calgary comme de QuĂ©bec
Keratin 19 as a stem cell marker in vivo and in vitro
The skin is a dynamic tissue in which terminally differentiated keratinocytes are replaced by the proliferation of new epithelial cells that will undergo differentiation. The rapid and continual turnover of skin throughout life depends on a cell population with unique characteristics: the stem cells. These cells are relatively undifferentiated, retain a high capacity for self-renewal throughout their lifetime, have a large proliferative potential, and are normally slow cycling. The long-term regeneration of grafted cultured epidermis indicates that epidermal stem cells are maintained in cultures. In animals they can be identified with 3H-thymidine or bromodeoxyuridine based on their property of slow cycling. The development of markers such as keratin 19 also permits their study in human tissues. In this chapter, protocols to study skin stem cells using their property of slow cycling and their expression of keratin 19 will be described in detail. The methods include the double labeling of tissues for keratin 19 and label-retaining cells (autoradiography of 3H-thymidine) in situ. The labeling of keratin 19 by immunofluorescence of by flow cytometry is described for cells in vitro.