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The influence of preparation time on ankle joint biomechanics during highly dynamic movements is largely unknown. The aim of this study was to evaluate the impact of limited preparation time on ankle joint loading during highly dynamic run-and-cut movements. Thirteen male basketball players performed 45°-sidestep-cutting and 180°-turning manoeuvres in reaction to light signals which appeared during the approach run. Both movements were executed under (1) an easy condition, in which the light signal appeared very early, (2) a medium condition and (3) a hard condition with very little time to prepare the movements. Maximum ankle inversion angles, moments and velocities during ground contact, as well as EMG signals of three lower extremity muscles, were analysed. In 180°-turning movements, reduced preparation time led to significantly increased maximum ankle inversion velocities. Muscular activation levels, however, did not change. Increased inversion velocities, without accompanying changes in muscular activation, may have the potential to destabilise the ankle joint when less preparation time is available. This may result in a higher injury risk during turning movements and should therefore be considered in ankle injury research and the aetiology of ankle sprains. 相似文献
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Guillaume Mornieux Dominic Gehring Patrick Fürst Albert Gollhofer 《Journal of sports sciences》2014,32(13):1255-1262
AbstractAnticipatory postural adjustments (APAs), i.e. preparatory positioning of the head, the trunk and the foot, are essential to initiate cutting manoeuvres during football games. The aim of the present study was to determine how APA strategies during cutting manoeuvres are influenced by a reduction of the time available to prepare the movement.Thirteen football players performed different cutting tasks, with directions of cutting either known prior to the task or indicated by a light signal occurring 850, 600 or 500 ms before ground contact.With less time available to prepare the cutting manoeuvre, the head was less orientated towards the cutting direction (P = 0.033) and the trunk was even more rotated in the opposite direction (P = 0.002), while the foot placement was not significantly influenced. Moreover, the induced higher lateral trunk flexion correlated with the increased knee abduction moment (r = 0.41; P = 0.009).Increasing lateral trunk flexion is the main strategy used to successfully perform a cutting manoeuvre when less time is available to prepare the movement. However, higher lateral trunk flexion was associated with an increased knee abduction moment and therefore an increased knee injury risk. Reducing lateral trunk flexion during cutting manoeuvres should be part of training programs seeking the optimisation of APAs. 相似文献
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G Broadley KM Broadley 《Educational research; a review for teachers and all concerned with progress in education》2013,55(3):259-268
In New Zealand, school principals (headteachers), sometimes with a sub-committee of the school board of trustees, interview and hire their own teachers. This research examined whether school principals exhibit different styles in recruiting beginning teachers. A small group of principals was interviewed and items reflecting their views were then developed and put on cards. The cards were sorted by people familiar with educational vocabulary to enable category setting using Kirkland and Bimmler's GOPA technique. Seventy-one principals then prioritized the items. A k-means algorithm was used to cluster principals with similar responses. Analysis of the clusters suggests that recruiting styles do exist. General compatibility emerged as being most important. This suggests that having schools appoint their own staff may lead to greater diversity between schools and greater conformity within them. 相似文献
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Information fluency for undergraduate biology majors: applications of inquiry-based learning in a developmental biology course 
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下载免费PDF全文 Many initiatives for the improvement of undergraduate science education call for inquiry-based learning that emphasizes investigative projects and reading of the primary literature. These approaches give students an understanding of science as a process and help them integrate content presented in courses. At the same time, general initiatives to promote information fluency are being promoted on many college and university campuses. Information fluency refers to discipline-specific processing of information, and it involves integration of gathered information with specific ideas to form logical conclusions. We have implemented the use of inquiry-based learning to enhance and study discipline-specific information fluency skills in an upper-level undergraduate Developmental Biology course. In this study, an information literacy tutorial and a set of linked assignments using primary literature analysis were integrated with two inquiry-based laboratory research projects. Quantitaitve analysis of student responses suggests that the abilities of students to identify and apply valid sources of information were enhanced. Qualitative assessment revealed a set of patterns by which students gather and apply information. Self-assessment responses indicated that students recognized the impact of the assignments on their abilities to gather and apply information and that they were more confident about these abilities for future biology courses and beyond. 相似文献
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Adolescents' perceptions of family relationships were studied using the FAST, a spatial technique in which wooden figures were placed on a board to represent cohesion and power. 150 subjects, drawn equally from sixth, ninth, and twelfth grades, portrayed the family in 2 representations: as perceived typically and ideally. Father-mother, father-child, and mother-child dyads were analyzed. Perceptions were strongly influenced by age, type of representation, and dyad. In accord with a developmental perspective, older adolescents portrayed less cohesion in parent-child dyads and smaller power differences in all dyads than did younger adolescents. In accord with family systems theory, the father-mother dyad was depicted as the most cohesive and as near egalitarian in power. At all ages and in both representations, parents were perceived as more powerful than their children. The family was generally portrayed as cohesive, significantly more so in the ideal than typical representation. Furthermore, in the ideal representation there were no significant power differences between the parents but moderate power differences in the parent-child dyads. Results were interpreted from both developmental and family systems perspectives. 相似文献
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Robert L. Callaway Donald D. Gehring Tracy J. Douthett 《Community College Journal of Research & Practice》2013,37(3):181-191
The Student Right-to-Know and Campus Security Act, passed by Congress on November 9, 1990, mandates that all colleges and universities receiving federal assistance funds under Title IV of the Higher Education Act of 1965 must provide graduation and crime data to current and prospective students and employees. The purpose of this study was to determine if two-year college admissions officers were complying with the Act's requirements. 相似文献
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Young children show significant changes in their mental-state understanding as marked by their performance on false-belief tasks. This study provides evidence for activity in the prefrontal cortex associated with the development of this ability. Event-related brain potentials (ERPs) were recorded as adults ( N = 24) and 4-, 5-, and 6-year-old children ( N = 44) reasoned about reality and the beliefs of characters in animated vignettes. In adults, a late slow wave (LSW), with a left-frontal scalp distribution, was associated with reasoning about beliefs. This LSW was also observed for children who could correctly reason about the characters' beliefs but not in children who failed false-belief questions. These findings have several implications, including support for the critical role of the prefrontal cortex for theory of mind development. 相似文献
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