Biomechanical analysis of the different classifications of the Functional Movement Screen deep squat test

The purpose of this study is to examine the peak sagittal plane joint angles and joint moments of the lower extremity during the deep squat (DS) movement of the Functional Movement Screen (FMS) to assess differences between the classifications (1,2,3). Twenty-eight participants volunteered for the study and were screened to assess their FMS score on the DS task. All participants underwent a quantitative movement analysis performing the FMS DS movement at a self-selected speed. The participants in Group 3 exhibited greater dorsiflexion excursion compared to those in Group 1. Participants in Group 3 had greater peak knee flexion and knee flexion excursion than those in Group 2 who exhibited more than the participants in Group 1. Group 3 also exhibited a greater peak knee extension moment compared to Group 1. At the hip, Groups 3 and 2 exhibited greater peak hip flexion, hip flexion excursion and peak hip extension moment compared to Group 1. Thus, it appears that individuals who score differently on the deep squat as determined by the FMS exhibit differences in mechanics that may be beneficial in assessing strategies for interventions. Future research should assess how fundamental changes in mobility and stability independently affect DS performance.     

Governing knowledge in the scientific community: Exploring the role of retractions in biomedicine

Although the validity of knowledge is critical to scientific progress, substantial concerns exist regarding the governance of knowledge production. While research errors are as relevant to the knowledge economy as defects are to the manufacturing economy, mechanisms to identify and signal “defective” or false knowledge are poorly understood. In this paper, we investigate one such institution - the system of scientific retractions. We analyze the universe of peer-reviewed scientific articles retracted from the biomedical literature between 1972-2006 and comparing with a matched control sample in order to identify the correlates, timing, and causal impact of scientific retractions. This effort provides insight into the workings of a distributed, peer-based system for the governance of validity in scientific knowledge. Our findings suggest that attention is a key predictor of retraction - retracted articles arise most frequently among highly-cited articles. The retraction system is expeditious in uncovering knowledge that is ever determined to be false (the mean time to retraction is less than two years) and democratic (retraction is not systematically affected by author prominence). Lastly, retraction causes an immediate, severe, and long-lived decline in future citations. Conditional on the obvious limitation that we cannot measure the absolute amount of false science in circulation, these results support the view that distributed governance systems can be designed to uncover false knowledge relatively swiftly and to mitigate the costs that false knowledge for future generations of producers.     

The Interpretation of Dreams: Ladson-Billings,Freud, and Derrida

This study provides a critical and close reading of The Dreamkeepers (1994), by Gloria Ladson-Billings. The paper focuses primarily on the gendered nature of “being a teacher” and “being a student” as revealed in the dreamkeeper text, while maintaining its engagement with race and culture as it is manifested in the United States context. It considers the remarkable double-voicedness of the dreamkeeper text through a Derridean understanding of dreams, memory, perception, and writing. The study concludes by inviting teachers and teacher educators to reflect upon their personal teaching images via continual engagement with the social codes that structure pedagogical relationships.     

Community-Building in a Diverse Setting

Research demonstrates that community-building in schools is an integral aspect of student success. Based on a foundation of research findings related to the importance of implementing community-building into all aspects of a school, community-building activities, including five specific classroom strategies (parent visits class to tell about child, weekly newsletter with interactive activities, bi-monthly open-house hour where children explain school work to parents, Valentine letters filled with true compliments, and a cultural celebration unit focused on Africa), were implemented in an urban magnet school. This school was moving toward racial integration as well as implementation of a Montessori education program. As predicted from research information, incorporating community-building strategies geared at creating a welcoming climate, at improving faculty interaction, at fostering collaborative classrooms, and towards on-going and open teacher/parent communication and collaboration resulted in positive outcomes in what could have otherwise been a difficult, negative or unproductive situation.     

Galileo's Mathematical Language of Nature

Undergraduate students do not always make a clear distinction between physics and mathematics, particularly early in their studies. We offer a simple historical example and show how it can be used to illustrate some of the important differences and relationships between the two. The example is Galileo's treatment of motion under uniform acceleration, in which he uses geometry instead of algebra to represent quantities such as time and velocity and stresses the need to test the adequacy of the representation by experiment. The general importance of Galileo's work in the history of science and the fact that it is accessible to undergraduates not concentrating their studies in mathematics or the sciences make it particularly suitable for our purposes. In addition to undergraduate courses in physics or mathematics, many of the points we make should be useful in courses in the history and philosophy of science and mathematics.