The effects of mid-flight whole-body and trunk rotation on landing mechanics: implications for anterior cruciate ligament injuries

ABSTRACT

The purpose was to quantify the effects of mid-flight whole-body and trunk rotation on knee mechanics in a double-leg landing. Eighteen male and 20 female participants completed a jump-landing-jump task in five conditions: no rotation, testing leg ipsilateral or contralateral (WBRC) to the whole-body rotation direction, and testing leg ipsilateral (TRI) or contralateral to the trunk rotation direction. The WBRC and TRI conditions demonstrated decreased knee flexion and increased knee abduction angles at initial contact (2.6 > Cohen’s dz > 0.3) and increased peak vertical ground reaction forces and knee adduction moments during the 100 ms after landing (1.7 > Cohen’s dz > 0.3). The TRI condition also showed the greatest knee internal rotation angles at initial contact and peak knee abduction and internal rotation angles and peak knee extension moments during the 100 ms after landing (2.0 > Cohen’s dz > 0.5). Whole-body rotation increased contralateral knee loading because of its primary role in decelerating medial-lateral velocities. Trunk rotation resulted in the greatest knee loading for the ipsilateral knee due to weight shifting and mechanical coupling between the trunk and lower extremities. These findings may help understand altered trunk motion in anterior cruciate ligament injuries.     

Seeing Merit as a Vehicle for Opportunity and Equity: Youth Respond to School Choice Policy

The Urban Review - School choice policy is ubiquitous in urban school districts. Evidence suggests that it has not fully delivered on its proponents’ promises of equitable educational...     

Government management of two media-facilitated crises involving dioxin contamination of food

Incidents become crises through a constant and intense public scrutiny facilitated by the media. Two incidents involving dioxin contamination of food led to crises in Belgium and the Republic of Ireland in 1999 and 2008, respectively. Thought to cause cancer in humans, dioxins reached the food supply in both incidents through the contamination of fat used for animal feed. The food and agricultural industries connected to each incident relied on crisis management activities of federal governments to limit adverse public reaction. Analysis of the management of the two crises by their respective federal governments, and a subsequent review of crisis management literature, led to the development of an effective crisis management model. Such a model, appropriately employed, may insulate industries associated with a crisis against damaged reputations and financial loss.     

A women's scientific society in the west. The late eighteenth-century assimilation of science

The Natuurkundig Genootschap der Dames (Women's Society for Natural Knowledge), formally established by and for women, met regularly from 1785 to 1881 and sporadically until 1887. It challenges our stereotypes both of women and the physical sciences during the eighteenth century and of the intellectual interests open to women in the early European republics. This essay aims not simply to identify the society and its members but to describe their pursuits and consider what their story adds to the history of Western science. What does this society's existence tell us about the relationship between women and early science in general and about science and society in the Dutch setting in particular? Science and gender look rather different when observed through the activities of the immensely prosperous women of Middelburg, citizens of one of the most highly literate Western countries. The elite lives of the first-generation members of the women's society also offer us a glimpse into the early domestication of science, a process vital to its acceptance and assimilation.     

Moral Outrage and Musical Corruption: White Educators’ Responses to the “Jazz Problem”

More than a musical genre, jazz in the 1920s was viewed by critics and supporters alike as a type of lifestyle, one that frequently led to drinking, dancing, and “petting.” Much to the horror of older generations, white young people were particularly drawn to jazz and its “hot rhythms.” Secondary school teachers and administrators took up the formidable task of persuading youth of jazz's morally corrupting influences. I argue that, in the first half of the decade, such educators instituted curricular and various informal policies designed to replace jazz, universally associated with black musicians, with more “wholesome” European‐originated alternatives. By the latter part of the decade, however, most educators admitted a grudging acceptance of jazz's permanence and abandoned their efforts to convince students of its iniquity.     

Educational practice,student experience,and the purpose of education—a critique of ‘Pedagogy in Practice’

The focus of the present paper is a critical discussion of the recently developed concept Pedagogy in Practice (PiP) with the intention of improving the concept for future research. PiP aims to understand ongoing educational practice from the students’ perspective by interviewing groups of students about their understanding of learning. By emphasising ‘pedagogy’ and ‘practice’ and drawing from a theoretical foundation that takes practice and action as key concepts, PiP is an appealing alternative to research in student voice, to which it is closely related. However, a critical analysis of PiP in relation to its stated theoretical sources (Bourdieu, Bernstein, Dewey) shows that the approach contradicts these sources in key areas. In PiP students’ understanding of learning is taken as basic for improving educational practice, however, PiP is developed without an explicit notion of what education is for. This paper introduces a specific formulation of the purpose and functions of education based on the work of Gert Biesta, and outlines how a revised version of PiP might contribute to future empirical research in education.     

Connecting Forensics and Assessment in the Twenty-First Century

A major feature of education in the twenty-first century is assessment. Forensic educators should heighten the importance of learning outcomes and utilize assessment efforts to directly measure how forensic programs develop educational foundations for students. This article focuses on the use of tournaments and noncompetitive educational outcomes, such as engagement within academic communities, service-learning, and the promotion of the value of forensics, to connect the educational benefits of the activity to help define the mission of forensics in the twenty-first century.     

The University Experiences of Students with Learning Disabilities

To explore the university experiences of students with learning disabilities (LD), 63,802 responses to the 2014 Student Experience in the Research University Survey were analyzed. Compared to other students, those with self‐reported LD (5.96 percent) had difficulty with assignments and had more obstacles caused by nonacademic responsibilities and imposed by their skill levels. Students with self‐reported LD sensed more bias toward people with disabilities on campus, and they were less satisfied with their overall experience. Interactions between disability status and age suggested even more challenges for older students who self‐reported LD. Approximately one‐third of students who self‐reported LD received accommodations. The rate of accommodations was higher among individuals who were wealthy, who lived alone, and who were out‐of‐state students. Compared to students who self‐reported LD but reported no accommodations, those with accommodations had more contact with faculty and less difficulty with assignments.     

Sequential structure in televised social behavior

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