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71.
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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. 相似文献
73.
Sarah Nur Marshall Kendall J. Michio Clark T. Blaine Hoshizaki 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):459-469
Goaltenders in ice hockey are the only players that are on the ice for the entire game. Their position exposes them to impacts from collisions with other players, falls to the ice, and puck impacts. In competitive ice hockey leagues, head injuries resulting from puck impacts have been reported with some cases resulting in ending the player’s career. Considerable research has been conducted to assess the performance of hockey helmets; however, few have assessed the performance of goaltenders’ masks. The purpose of this study was to compare the capacity of four goaltenders’ masks for the protection from puck impact as measured by head acceleration and peak force. A Hybrid III headform was fitted with four different goaltender masks and impacted with a hockey puck in three locations at 25 m/s. The masks were found to vary in the level of protection they offered as the mask with the thickest liner resulted in lower forces than the thinnest mask for side impacts; however, the thinnest mask resulted in the lowest force for front impacts. Despite performance differences at specific locations, no one mask proved to be superior as peak acceleration and peak force values did not exceed the thresholds necessary for concussion. 相似文献
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The signaling function of the second-order CS (S2) was manipulated in second-order autoshaping by arranging a partial reinforcement schedule. S2 was paired with a well-conditioned first-order CS (SI) on a continuous reinforcement or a 25% reinforcement schedule in different groups. Schedule of reinforcement did not influence the number of S2-S1 pairings required to establish keypecking to S2. However, in the postacquisition sessions, responding to S2 was initially weaker but persisted for many more sessions on the 25% schedule than on the 100% schedule. The data indicate that S2-S1 pairings are responsible both for the acquisition of second-order keypecking to S2 and for the subsequent conversion of S2 into an inhibitory stimulus. 相似文献
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Cristyn Davies Susan Rachel Skinner Tanya Stoney Helen Siobhan Marshall Joanne Collins Jane Jones 《Sex education》2017,17(3):256-275
AbstractThe National Human Papillomavirus (HPV) Vaccination Program in Australia commenced in 2007 for girls and in 2013 for boys, using the quadrivalent HPV [4vHPV] vaccine. In Australia, students are primarily vaccinated en masse, on school grounds, after parental/guardian consent is obtained. Students most often receive little, or no, education at school about HPV or HPV vaccination prior to immunisation. There is also some uncertainty about where young people can and should obtain reliable information about the vaccine, outside of school. We conducted a cluster randomised controlled trial of a complex intervention in schools. This study aimed to improve: (1) student knowledge about HPV vaccination; (2) psycho-social outcomes and (3) vaccination uptake. In this paper, we briefly outline our educational intervention and discuss its implementation by educators including facilitators and barriers. We also discuss the study findings pertaining to student knowledge about HPV and HPV vaccination and their attitudes to vaccination across control and intervention schools. Study results showed students in intervention schools demonstrate greater knowledge and understanding of HPV and HPV vaccination. Greater knowledge and understanding of HPV and HPV vaccination appeared to promote positive attitudes towards vaccination and supported confidence with vaccination. 相似文献
78.
Jon C. Marshall 《Research in higher education》1987,26(4):417-429
This study provides an initial examination of a learning style topology through the comparison of information processing and instructional preference toponymies. It was hypothesized that learning style modes would be discernible within each of these toponymies and that the toponymies would demonstrate orthogonality. Data analyzed for 429 university students supported these hypotheses. 相似文献
79.
Gavin T.L. Brown Jennifer C. Marshall 《Assessment & Evaluation in Higher Education》2012,37(6):653-670
Successful academic writing requires strong command of the rhetorical moves that orient the reader to the theme and substantive material of an academic essay. Effective control of the introduction leads to better overall writing. The goal of this study was to devise and evaluate a pedagogy for teaching the writing of academic essay introductions. The study employed a pre-, post-, and delayed post-test design in a single university student learning site. Student writing was scored on eight aspects related to (1) structure and content and (2) style. Confirmatory factor analysis reduced the eight scores aggregated into the two scales. A single two-hour workshop increased the participants’ (n = 87) performance in the rhetorical structure and content of their introductions, but not the style. A longitudinal model (n = 20) using three sets of parcelled scores showed that the structure and content of the introduction positively predicted the grade awarded by the student’s faculty. Direct instruction in writing introductions, through a relatively short, low-cost, genre-based training programme, appears to achieve significant student learning. 相似文献
80.
Joanne M. Marshall 《理论付诸实践》2014,53(2):139-148
This article identifies historical and contemporary influences of religion in US public schooling. It provides analytical questions that social justice leaders can use to evaluate the practices embedded in their own schools, including an equity audit. 相似文献