Differences among fastball,curveball, and change-up pitching biomechanics across various levels of baseball

Controversy continues whether curveballs are stressful for young baseball pitchers. Furthermore, it is unproven whether professional baseball pitchers have fewer kinematic differences between fastballs and off-speed pitches than lower level pitchers. Kinematic and kinetic data were measured for 111 healthy baseball pitchers (26 youth, 21 high school, 20 collegiate, 26 minor league, and 18 major league level) throwing fastballs, curveballs, and change-ups in an indoor biomechanics laboratory with a high-speed, automated digitising system. Differences between pitch types and between competition levels were analysed with repeated measures ANOVA. Shoulder and elbow kinetics were greater in fastballs than in change-ups, while curveball kinetics were not different from the other two types of pitches. Kinematic angles at the instant of ball release varied between pitch types, while kinematic angles at the instant of lead foot contact varied between competition levels. There were no significant interactions between pitch type and competition level, meaning that kinetic and kinematic differences between pitch types did not vary by competition level. Like previous investigations, this study did not support the theory that curveballs are relatively more stressful for young pitchers. Although pitchers desire consistent kinematics, there were differences between pitch types, independent of competition level.     

Early kindergarten identification of academically not-ready children by use of human figure drawing developmental score

The Koppitz Human Figure Drawing (HFD) Test was examined for use in early identification of academically not-ready kindergarten children. HFD developmental scores of a group of children who later “passed” the Metroplitan Readiness Test (stanine score ≥4), as required for admission to the first-grade classroom, were compared with the HFD scores of a group of children who later “failed” the Metropolitan Readiness Test (stanine score ≤3). Evaluation of the test data showed that the optimum HFD score cut-off point for prediction of nonreadiness was ≤3; 42% of the nonready and 90% of the ready children, as defined by the Metropolitan Readiness Test (MTR) score criterion, were correctly identified. An overall hit rate of 75% was obtained on the experimental population. The work indicates that HFD developmental scores are useful for early identification of the academically not-ready kindergarten child.     

Uncovering students’ thinking about thinking using concept maps

A method for uncovering students’ thinking about thinking, specifically their meta-strategic knowledge, is explored within the context of an ongoing, multi-year intervention designed to promote the development of students’ thinking dispositions. The development of a concept-map instrument that classroom teachers can use and an analytic framework for interpreting students’ responses is presented. In a preliminary study, the concept map instrument is piloted to evaluate changes in students’ conceptions of thinking after a year’s participation in classrooms where their teachers actively sought to make thinking more visible by noticing and naming the thinking observed as well as introducing and using thinking routines (Ritchhart and Perkins. Educational Leadership, 65(5), 57–61 2008). Concept maps from 239 students from grades 3 through 11 were analyzed. Results suggest that students’ conceptions of thinking do improve with age but also can be substantially developed through a classroom culture where thinking is modeled and rich opportunities for thinking are present. The concept map instrument itself proved to be a robust instrument for uncovering students’ thinking about thinking.     

The impact of action learning: what difference are we making in the world?

Involvement in a number of action-learning programmes and associated development opportunities has led the Professional Development Centre Limited to question the relevance of a strict adherence to the ‘rules’ of action learning as described by Reg Revans. A deliberate focus of one such programme to a financial services organisation offered some insights into the challenges of introducing action learning into the field. Pressures on organisations of time and business expedients might make them believe that action learning is too slow a technique to offer real rewards. However, elements of the action-learning story do resonate in the workplace, key concepts that appear to ‘stick’ are listening, questioning and equality. The utilisation of these skills enhances leadership and organisational development and can still provide a useful set of actions to aim for. This is especially true in problem solving and the way in which respect and equality can re-create a different environment or development space.     

Innovating for a cause: the work and learning required to create a new approach to healthcare for homeless people

Innovation occupies a pivotal place in our understanding of knowledge-based economies, and this is raising questions about sources of innovation, how it originates, and the role played by employees, work practices and learning. This paper explores these issues through case study research into a new approach to providing healthcare for homeless people in England, and by bringing together conceptual insights from the employee-driven innovation literature, and more broadly from social and practice-based learning theory and organisational theory. Applying these perspectives to our case enables illumination of the innovation as a process – not an event – and as an ongoing set of organisational practices that transcend their origins. Through our analysis we argue that the notion of ‘a cause’ is helpful in elucidating the impetus and the commitment to making the innovation happen (and go on happening). Our findings are presented under three themes: ‘establishing a cause’, ‘organising for innovation’, and ‘innovative capability in practice’. Building on these, we have identified five key inter-related dimensions which help conceptualise the work and learning that it took to create and (re-)enact the innovation and that we suggest may have relevance for understanding and characterising other employee-led innovations in and perhaps beyond healthcare.     

Re-victimization patterns in a national longitudinal sample of children and youth

OBJECTIVE: To understand to the degree to which a broad variety of victimizations, including child maltreatment, conventional crime, peer, and sexual victimizations, persist for children from 1 year to the next. DESIGN: A national sample of 1467 children aged 2-17 recruited through random digit dialing and assessed via telephone interviews (with caretakers and youth themselves) about a comprehensive range of victimization experiences in the previous year, and then re-assessed (72.3% of baseline sample) after a 1-year interval. RESULTS: The risk for re-victimization in Year 2 was high for children victimized in Year 1, with risk ratios ranging from 2.2 for physical assault to 6.9 for sexual victimization. Victimization of any one type left substantial vulnerability even for different types of subsequent re-victimization (e.g., property crime victimization was associated with higher risk of sexual victimization the next year). Children with four or more types of victimization in Year 1 ("poly-victims") were at particularly high risk of persisting poly-victimization. Persisting poly-victimization was more likely for children who scored high on anger/aggression and who had recent life adversities. Desistence from poly-victimization was associated with having more good friends. Onset of poly-victimization in Year 2, in contrast to persistence from Year 1, was associated with violent or maltreating families, family problems such as alcohol abuse, imprisonment, unemployment and family disruption. Having more older siblings acted as both a risk factor and a protective factor for different groups of youth. CONCLUSION: Children previously victimized in 1 year are at higher risk of continued victimization, and the poly-victims are at particular risk. These findings suggest the potential merit of identifying these high-risk children and making them priority targets for prevention efforts.     

Comparison of efficiency measures for academic interventions based on acquisition and maintenance

Previous research has demonstrated the importance of examining the instructional efficiency of academic interventions and has defined efficiency as the number of items learned per instructional minute. Maintenance of the skill is also an important instructional goal, however. Therefore, the current study compared efficiency metrics using initial learning and maintenance with 25 fourth‐grade students. Each student was taught the pronunciation and English translation of 12 words from the Esperanto international language with two instructional conditions (six words for each condition). The first condition was traditional drill (TD) rehearsal with all unknown words, and the second was incremental rehearsal (IR) with one unknown and eight known words. Results indicated that, although the IR condition led to significantly more words being retained, TD was significantly more efficient using initial learning. The two conditions were equally efficient, however, when maintenance data were used. Therefore, evaluating the efficiency of instructional interventions should consider maintenance data as well. © 2009 Wiley Periodicals, Inc.