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.     

Texts and the foreign language teacher: some reflections on aims

Cain, M. “Texts and the foreign language teacher: some reflections on aims,” Revue ATEE Journal 1980 (3) 135‐145.

This article, originally presented as a paper at a conference in Denmark on the notion of ‘text’ in language teaching, explores the aims of language teaching. The author relates what he considers to be progressive elements in language teaching pedagogy to the basically conservative tradition which exists in practice. Through an examination of the notion of ‘truth’ in connection with work with texts, he outlines three different traditions within educational theory: the positivist, the humanist and the emancipatory. Taking the last tradition as a factor of renewal, the author outlines a didactic model which would live up to the aims of modern language teaching as he sees them. In conclusion, a number of practical points are made relating to the application of such a model.     

The Fate of the Mammoth: Fossils, Myth, and History

Mammoth remains became evidence for many theories about Earth's history, as this study carefully traces. A superb case study at the intersection of science and culture.     

Do maternal concerns at delivery predict parenting stress during infancy?

OBJECTIVE: In a previous study, we found that new mothers could and would express concerns about their parenting, including concerns about maltreatment and poor care. In this study, we examine the utility of early maternal concerns for predicting parenting stress in the first year. Parenting stress is important because it has been shown to be related to maltreatment and poor parent-child relationships. METHOD: A sample of 246 mothers were interviewed shortly after delivery in a publicly funded hospital about their parenting concerns, and 93% were reinterviewed in their homes about their parenting when the infants were 6 to 12 months old. Standardized measures with demonstrated psychometric properties were employed, including a measure of parenting stress due to the demands of the parenting role, characteristics of the child that make him or her difficult to care for, and stress due to difficult interactions. RESULTS: Multiple regression results indicate that both mothers concerns at delivery and sociodemographic variables are significant predictors of all three types of parenting stress in infancy. Maternal concerns were more powerful than sociodemographics in predicting stress related to the demands of parenting, while sociodemographics were more powerful for the prediction of stress related to difficult child characteristics and difficult mother-infant interaction. CONCLUSIONS: These findings suggest that knowledge of new mothers' parenting concerns might be useful for predicting parenting problems, as well as for engaging mothers' in and enhancing the effectiveness of parenting services.     

Effects of prior social experience on agonistic responding by Siamese fighting fish (Betta splendens)

The role of prior social experience in maleBetta agonistic behavior was investigated in two experiments. Fish were either paired with an opponent until dominance was established naturally (Experiment 1) or given prior combat experience with a known aggressive or nonaggressive opponent (Experiment 2). The effects of prior social experience were then observed both in additional paired encounters and in some noncombat agonistic situations. The paired-encounter data indicate thatBetta attack aggressive opponents more than nonaggressive ones and rarely attack opponents once they have submitted. In contrast to attacking, these fish do not show a significant decrease in displays once their opponent has submitted, nor do they display differentially to aggressive and nonaggressive opponents. The noncombat agonistic-situation data indicate that prior social experience affects both the preference of fish for viewing other conspecifics and the waning of display behaviors. These results suggest that submissive and nonaggressive behaviors can inhibit attacks but not displays byBetta, and they emphasize the necessity of controlling for prior social experience when studying aggressive behavior.     

TEACHING,TECHNOLOGY, AND SUPPORT IN THE NEW MILLENNIUM: A GUIDE FOR NEW COMMUNITY COLLEGE TEACHERS

Beginning community college faculties have many responsibilities associated with teaching. Technology can alter and enhance some of the traditional expectations for teaching and learning. New professionals will benefit by becoming familiar with existing and new technology and by recognizing the college mechanisms and support systems available to them including mentors, faculty, and staff.     

Literature‐informed,one‐turn action research: three cases and a commentary

Although action research is a common feature of courses of initial teacher training, the evidence as to its efficacy, in encouraging reflection among trainees, is mixed. This article discusses cases of action research assignments carried out by three trainees into their own practice in relation to (a) behaviour management, (b) monitoring and assessing, and (c) pupil‐centred education. The assignments are analysed using Bloom et al's. (1964) typology of thinking skills, Handal & Lauvas's (1987) model of reflective practice, and typologies of action research by Noffke (1997) and Rearick and Feldman (1999). They are positioned as cases of ‘literature‐informed, one‐turn’ action research; a concept which is discussed in relation to other concepts of action research.