Measurement Errors in Modified Pull-Ups Testing

In a review of 46 meta-analyses of gender differences, overhand throwing had the largest gender difference favoring boys (ES > 3.0). Expectations for gender-specific performances may be less pronounced in female Australian Aborigines, because historical accounts state they threw for defense and hunting. Overhand throwing velocities and kinematics were recorded in 30 female and male Aboriginal Australian children 6-10 years old. Results indicated the Aboriginal girls and boys were more similar in horizontal ball velocities than U.S. girls and boys. Throwing kinematics between girls and boys were also more similar in Australian Aborigines than U.S. children. Aboriginal girls threw with greater velocities than U.S., German, Japanese, and Thai girls, while the boys were similar across cultures.     

Which drop jump technique is most effective at enhancing countermovement jump ability, “countermovement” drop jump or “bounce” drop jump?

Abstract

The drop jump is a popular form of plyometric exercise often undertaken to enhance countermovement jump ability (jump height). Despite its popularity the effects of drop jump training on countermovement jump height are often inconsistent. Such inconsistencies may be as a result of differences in the drop jump technique being employed. Two recognised forms of drop jump are the “countermovement” drop jump and the “bounce” drop jump and the current study examined the effects of eight weeks of training with these drop jump techniques on countermovement jump height. Methods: A kinetic and kinematic analysis of each participant's countermovement jump, bounce- and countermovement drop jumps was undertaken prior to training. Participants were then randomly assigned to a bounce drop jump training group (n = 34), a countermovement drop jump training group (n = 35) or a control group (n = 34). Changes in jump height were examined following training. Results: The countermovement drop jump training group increased their countermovement jump height by 2.9 cm (6%), which was a significant change (P < 0.05) in comparison to that experienced by the bounce drop jump (-0.2 cm, -0.4%) and the control group (-0.1 cm, 0.2%). Conclusion: The countermovement drop jump may be more effective than the bounce drop jump at enhancing countermovement jump height.     

Knowledge generation and sharing in UK universities: A tale of two cultures?

As economies become more knowledge intensive it has become evident to most organizations that knowledge is a valuable resource. This is particularly true in academic organizations, which have the generation and dissemination of knowledge as their principal mission. This research assesses whether path-dependency exists in relation to cultural expectations of knowledge generation and sharing in knowledge intensive organizations. This paper adopts a constructivist approach facilitated by focus group discussions which were conducted in two UK universities, one Russell group university and the other a post-1992. Institutional culture and path dependency play a major role in the willingness of institutions to generate and share knowledge. Each institution exemplified a distinct path-dependency that underpinned cultural expectations but in each case internal and external factors were necessitating changes regarding knowledge sharing and generation which affected individual perspectives and organizational structures. The paper concludes by purporting that certain universities display critical junctures and cultural transformation in terms of knowledge generation, dissemination and sharing.     

Developing coaching pedagogy: seeking a better integration of theory and practice

Despite evidence that experience within practical coaching contexts serves as the principal knowledge source for coaches, academic (and professional) coach education programmes continue to be heavily taught along didactic lines. Such courses are often considered as fine in theory but divorced from the gritty realities of practice. The aim of this article was to construct and evaluate a pedagogical framework (delivered through an MSc unit) drawn from tenets of both action research and ‘communities of practice’ as a means through which the practice-theory gap can be somewhat addressed. The unit in question involved students being introduced to a particular theoretical position with the expectation that they would integrate that theory into their practice in the upcoming week. The students then shared their experiences in structured discussion groups during the following class. Data on student learning were gathered both through on-going observations, and focus groups interviews with staff and students at the end of the unit. The data were inductively analysed. Findings revealed that the students were generally stimulated by and, hence, generally positive about the pedagogical approach experienced. This was specifically in terms of better ordering the knowledge they had as well as developing new insights about coaching practice. Although not unproblematically, the staff were also positive about the unit; citing better and more continuous student engagement as a result of it.     

Is passive drag dependent on the interaction of kayak design and paddler weight in flat-water kayaking?

Abstract

Drag is one of the major factors that influences kayaking performance. To focus on the drag of the kayak’s hull shape and the paddlers’ weight per se, the passive drag (D_p) was measured on a flat-water sprint course for one paddler with added weights. D_p was measured by an electromechanical towing device using a load cell, at incremental and constant velocities from 2.78 to 5.56 m/s. Three kayaks of different sizes and shapes (Nelo® K1 Quattro-M, ML, and L) were used and the paddlers’ body weight was adjusted with weights so the total paddler weight in the kayak was 65, 75, and 85 kg. The mean D_p increased by the power function of D = kvⁿ (mean R² = .990; SD .006). The D_p went from 21.37?±?1.29 N at 2.78 m/s to 89.32?±?6.43 N at 5.56 m/s. For the two lighter weighted kayaks (65 and 75 kg), the lowest D_p was observed with different kayak sizes (M, ML, or L) depending on the target velocity. The manufacturers suggest that paddlers should select a kayak size according to their body weight to minimise drag; however, the results of this study suggest that target velocities, and thus competition distance should also be factored into kayak selection.     

Training priority: Positive suggestions

“Keep the sand low, Mike, so it doesn't accidentally get in someone's eyes. That would hurt. Yes, like that — you and Jonathan are building some very long roads. Would a little water help you pack them smoothly?” This teacher's tone of voice is accepting, and her words show understanding of the lifelong learning process.     

Validation and profile of Chinese pre-service teachers’ technological pedagogical content knowledge scale

Researchers state that teachers in different contexts reported different technological pedagogical content knowledge (TPACK). This phenomenon may partially be explained by cultural differences. Based on this consideration, the development and validation of the Chinese pre-service teachers’ technological pedagogical content knowledge (CTPCK) scale is described in this article. The sample was split into two subsamples on random basis (n1 = 229, n2 = 207) for the purpose of conducting (1) exploratory factor analysis (EFA) and (2) confirmatory factor analysis (CFA), respectively. After the EFA, the CTPCK scale excluded six items and included eight factors with 42 items. Reliability and correlations were discussed. The findings revealed that the CTPCK scale was a valid and reliable instrument for measuring the TPACK of Chinese pre-service teachers’ knowledge with or without linking educational technology.     

Critical thinking and the danger of intellectual conformity

Critical thinking is becoming an essential ingredient in college and university curricula. Its stated goals are to foster critical ability and broad-mindedness, on both the conceptual and the social level. But an overemphasis of its reductionistic method can lead to results which are antithetical to its aims. Methodologically, it tends to encourage absolutism; psychologically, its exclusive rule orientation promotes passivity; and practically, its imperial rejection of nonanalytical methods breeds intolerance. Together, these three effects lead to a fetish-like regard for intellectual and social conformity, and an accompanying fear of eccentricity. The conclusion is that the present lopsided concentration on critical thinking's reductionism should be balanced with the teaching of alternative approaches to the understanding of knowledge and reality.