When professional athletes change sports: Sport development,sanctity of contract,and restraint of trade in the NRL     

Sheranne Fairley  Kevin Snyder  Pamm Kellett  Brad Hill 《Sport Management Review》2013,16(1):111-119

This case study provides insight into a current issue faced by sporting leagues—the movement of professional players to different sports. As the case illustrates, the movement of professional players across sport codes can have a profound impact on the management of sport development, the management of player contracts, and legal issues in restraint of trade.  相似文献   

Cycling     

Raoul Reiser II  Jon Watt  Michael Peterson 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):237-249

The resistance against a cyclist while riding on rollers is due mainly to rolling resistance produced by the deformation of the tyre as it rolls against small diameter drums. Resistance is then combined with wheel speed to set power output. The effect of tyre pressure and cross‐section on power was investigated by systematically altering the pressure (552 kPa, 690 kPa, and 827 kPa) in a 20c, 23c, 25c, and 28c tyre of the same design while riding at a wheel speed of 45 kph. Average power over 1 minute was measured with a Power Tap Hub (Tune Corporation, Cambridge, Massachusetts, USA) on five occasions. Statistical significance was evaluated at p < 0.05. Power requirements increased significantly with each reduction in tyre pressure for all tyres and pressures except the 25c between 690 and 827 kPa. The 20c tyre required significantly more power from the cyclist at each tested tyre pressure when compared to the other tyres (which were not different from each other). The differences in resistance from tyre size were not observed when ridden on the road. Additionally, a slightly different tyre design from the same manufacturer responded similarly in the 20c, but was significantly different in the 23c size. It was also observed that power requirements increased significantly when both the wheels were ridden on the rollers as compared to just the rear wheel. These results indicate that the power requirements may be significantly altered by the cyclist by adjusting tyre pressure, tyre cross‐section size, tyre type, and with the number of wheels contacting the rollers. However, the magnitude of these power requirements may not be suitable for intense workouts of trained cyclists.  相似文献   

The reliability of isoinertial force–velocity–power profiling and maximal strength assessment in youth     

César M.P. Meylan  John B. Cronin  Jon L. Oliver  Michael M.G. Hughes  Boris Jidovtseff  Shane Pinder 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):68-80

The purpose of this study was to quantify the inter-session reliability of force–velocity–power profiling and estimated maximal strength in youth. Thirty-six males (11–15 years old) performed a ballistic supine leg press test at five randomized loads (80%, 100%, 120%, 140%, and 160% body mass) on three separate occasions. Peak and mean force, power, velocity, and peak displacement were collected with a linear position transducer attached to the weight stack. Mean values at each load were used to calculate different regression lines and estimate maximal strength, force, velocity, and power. All variables were found reliable (change in the mean [CIM] = ? 1 to 14%; coefficient of variation [CV] = 3–18%; intraclass correlation coefficient [ICC] = 0.74–0.99), but were likely to benefit from a familiarization, apart from the unreliable maximal force/velocity ratio (CIM = 0–3%; CV = 23–25%; ICC = 0.35–0.54) and load at maximal power (CIM = ? 1 to 2%; CV = 10–13%; ICC = 0.26–0.61). Isoinertial force–velocity–power profiling and maximal strength in youth can be assessed after a familiarization session. Such profiling may provide valuable insight into neuromuscular capabilities during growth and maturation and may be used to monitor specific training adaptations.  相似文献   

An exploratory study contrasting high- and low-achieving students' percent word problem solving     

Asha K. Jitendra  Jon R. Star 《Learning and individual differences》2012,22(1):151-158

This study evaluated whether schema-based instruction (SBI), a promising method for teaching students to represent and solve mathematical word problems, impacted the learning of percent word problems. Of particular interest was the extent that SBI improved high- and low-achieving students' learning and to a lesser degree on the indirect effect of SBI on transfer to novel problems, as compared to a business as usual control condition. Seventy 7th grade students in four classrooms (one high- and one low-achieving class in both the SBI and control conditions) participated in the study. Results indicate a significant treatment by achievement level interaction, such that SBI had a greater impact on high-achieving students' problem solving scores. However, findings did not support transfer effects of SBI for high-achieving students. Implications for improving the problem-solving performance of low achievers are discussed.  相似文献   

Creativity in the training and practice of instructional designers: the Design/Creativity Loops model     

Gregory Clinton  Brad Hokanson 《Educational technology research and development : ETR & D》2012,60(1):111-130

This article presents a discussion of research and theoretical perspectives on creativity and instructional design, offering a conceptual model of the connection between these two constructs that was originally proposed in the dissertation work of the first author (Clinton, Creativity and design: A study of the learning experience of instructional design and development graduate students, Unpublished doctoral dissertation, University of Georgia, Athens, 2007) and that we call the Design/Creativity Loops (DCL) model. Central to the model is a representation of the iterative, looping problem-solving cycle that can include established stages of creative thinking. As an instructional designer is routinely confronted with the next task or design problem in a project, these tasks or problems spawn iterative mental excursions that are opportunities for creative thinking. This article also explores ways that the design and development process can benefit from an emphasis on creativity and offers suggested directions for future research.  相似文献   

Network analysis of temporal trends in scholarly research productivity     

Hyoungshick Kim  Jon Crowcroft 《Journal of Informetrics》2012,6(1):97-110

We propose a method to identify the journals or proceedings that are most highly esteemed by a research group over some time frame. Using open publication databases, we identify the experts in the community, and analyse their publication pattern, and then use this as a guideline for evaluating scientific outputs of other groups of researchers publishing in the same domain. To illustrate the practicality of our method, we analyse the scientific output of Korean researchers in the security subject domain from 2004 to 2009, and comparing this groups’ output with that of well-known researchers. Our empirical analysis demonstrates that there is a persistent gap between these two research groups’ publications impact over this period, although the absolute number of journal publications greatly increased over recent years.  相似文献   

Repeat participation as a function of program attractiveness,socializing opportunities,loyalty and the sportscape across three sport facility contexts     

Brad Hill  B. Christine Green 《Sport Management Review》2012,15(4):485-499

Effects of sport facility services of program attractiveness, socializing opportunities customer loyalty, and the sportscape on frequency of participation at three different types of sport facilities; special purpose – health and fitness centers, single-purpose – tennis, golf or swim pool amenities, and multi-use – gymnasia were examined. The purpose of the study was to identify differences between, and effects on, participation at different types of participant sport facilities due to service quality. Data were collected on a sample of 1199 participants from a mid-sized east coast Australian city. Linear restrictions testing determined that the three sport facility types were significantly different in the ways in which the constructs affect repeat participation. The sportscape has the most impact on participation frequency at fitness facilities, and minimal impact on participation at multi-sport facilities. Implications for retaining customers at each facility type are discussed.  相似文献   

Public Procurement for Innovation as mission-oriented innovation policy     

Charles Edquist  Jon Mikel Zabala-Iturriagagoitia 《Research Policy》2012,41(10):1757-1769

This article focuses on Public Procurement for Innovation as a relevant demand-side instrument to be exploited in the mitigation of grand challenges. It intends to provide some clarification on what should (and what should not) be regarded as innovation procurement. It defines what is meant by Public Procurement for Innovation and categorizes it according to three dimensions: (i) the user of the purchased good; (ii) the character of the procurement process; and (iii) the cooperative or non-cooperative nature of the process. In addition, it illustrates the main stages in innovation procurement processes and exemplifies them with six cases to provide evidence that Public Procurement for Innovation can contribute to satisfying unsatisfied human needs and solving societal problems.  相似文献   

Performance score variation between days at Australian national and Olympic women's artistic gymnastics competition     

Bradshaw EJ  Hume PA  Aisbett B 《Journal of sports sciences》2012,30(2):191-199

We determined the inter-day variability in elite-standard women's artistic gymnastics competition scores. National (50 gymnasts for up to three days) and Olympic (24 gymnasts for up to five days) competition scores published in the public domain ('Giant poster pull-out', 2010 ; Gymnastics Australia, 2008 ) were evaluated using three statistical measures. Analyses of the inter-day differences in the mean scores as a percentage (MDiff%), coefficient of variation percentages for the mean score across both days (CV%), and Pearson correlation coefficients for the inter-day score (r) were interpreted using thresholds from trivial to large. National-class gymnasts' two-day performance variation was trivial for vault, small for floor and beam, and moderate for bars. When senior gymnasts competed for a third day the performance variation increased to moderate for vault. Across five days of Olympic competition there were trivial (e.g. CV%: vault = 0.8) to small (e.g. CV%: bars = 2.0) variations in performances between days on all apparatus. Olympians' performance score consistency is superior to senior, national-class competitors. The performance score consistency required for gymnasts who aspire to participate at the Olympics as a top-24 competitor is better than 3%.  相似文献   

Adult Science Learning in the Internet Era     

Jon D. Miller 《Curator: The Museum Journal》2010,53(2):191-208

Abstract This article outlines a different view of the changing nature of adult learning in the Internet era. The old model of learning—the warehouse—is being replaced by a “just‐in‐time” system of information acquisition. The NRC report focuses too heavily on finding missions for existing institutions and pays too little attention to the pervasive changes in information acquisition and adult learning in all areas. An analysis of existing data demonstrates the relative impact of formal and informal learning and points to opportunities for enhanced adult science learning in the future. In a just‐in‐time world, museums and similar informal learning institutions will need to be less dependent on their physical setting and more focused on learning as the end product. It will also be necessary to find a viable revenue model to support this emerging mission.  相似文献