Physical movement demands of elite-level netball match-play as measured by an indoor positioning system

ABSTRACT

Physical movement demands in elite netball match-play have been limited to notational analysis or accelerometer-derived measures, due in part to the indoor environment in which they are played. Commercially available local positioning systems (LPS) using ultra-wideband communication have been designed to bring similar capabilities as global positioning systems (GPS) to indoor environments. This study aims to quantify both spatiotemporal and traditional accelerometer-derived measures, to assess the movement demands of all playing positions, during Australian national netball league matches. Total distance, metreage per minute, acceleration density, acceleration density index, acceleration load, jumps, velocity bands, acceleration bands and PlayerLoad variables have been presented for each position. Mean total distance-covered in match-play differed substantially between positions. Centre position accumulated the highest mean distance (5462.1 ± 169.4 m), whilst the Goal Shooter consistently covered the lowest mean distance (2134 ± 102.6 m). Change of direction relative to movement area was highest for the two most restricted positions based on average acceleration per 10 m covered during match-play (Goal Shooter; 7.21 ± 0.88 m · s ^{? 2} and Goal Keeper; 6.75 ± 0.37 m · s ^{? 2}, remaining positions; 5.71 ± 0.14 m · s ^{? 2}). The positional profiles outlined in this study can assist skill and conditioning coaches to prescribe training sessions that will optimise the athlete’s physical preparation for the demands of competition.     

Successful Programs for Undergraduate Women in Science and Engineering: Adapting versus Adopting the Institutional Environment

This article focuses upon programs for undergraduate women in science and engineering, which are a strategic research site in the study of gender, science, and higher education. The design involves both quantitative and qualitative approaches, linking theory, method, questions, and analyses in ways not undertaken previously. Using a comprehensive, quantitative, cross-institutional, and longitudinal method, two extreme groups of programs are distinguished: those associated with the “most successful” and “least successful” outcomes in undergraduate degrees awarded to women in science and engineering. Qualitative analyses of interview data with key players in the programs in these two groups point to ways in which definitions of issues, problems, and solutions diverge (as well as converge), and thus to conceptual underpinnings that have important real-life consequences in these organizational settings of higher education. The programs that regard issues, problems, and solutions of women in science and engineering as rooted in “institutional/structural-centered,” as opposed to “individual/student-centered,” perspectives are associated with the most positive outcomes in undergraduate degrees awarded to women in science and engineering.

Media Portrayals of Romantic Relationship Maintenance: A Content Analysis of Relational Maintenance Behaviors on Prime-Time Television

Maintenance behaviors play an important role in sustaining relational states, especially within committed romantic relationships. Limited research, however, has considered media portrayals of these behaviors. From the framework of social cognitive theory, this content analysis examined relational maintenance behaviors portrayed by committed romantic couples (heterosexual, gay, and lesbian) on prime-time network television. The frequency of maintenance behaviors (positivity, understanding, self-disclosure, assurances, relationships talks, tasks, and networks) varied by type, valence, program genre, and couple type (married/civil union or cohabitating). Results indicated that comedies featured more frequent relationship maintenance behaviors than dramas. In addition, comedies exhibited more frequent negative maintenance behaviors than dramas. Differences also existed between couple regarding the types of maintenance behavior exhibited. No sex differences in maintenance behaviors were observed between male and female characters.     

Monitoring and Mitigating Particulate Matter Deposition on Decorative Surfaces: Current and Future Approaches in the Palace of Westminster

ABSTRACT

Research into dust deposition rates on the wall paintings in the State Apartments at the Palace of Westminster, London, UK, began during the restoration of the encaustic floor tiles. The study has broadened to inform day-to-day preventive care for the extensive fine art collections on display and the intricately decorated Gothic interiors, providing a powerful tool for the forthcoming restoration and renewal of the Palace. Different monitoring methods, using optical microscopy, macro-photography and software-based image analysis, were investigated. Qualitative analysis with SEM-EDX and optical microscopy allowed the identification of a number of anthropogenic, geogenic and biological sources of particulate matter, while quantitative results elucidated deposition trends, highlighting both seasonal and works-related impacts. Results indicated that mitigation measures taken to protect works of art and limit the diffusion and deposition of particulate matter on surrounding surfaces were successful. A new dust monitoring method, based on imaging of vertical surfaces and on a recently developed image analysis workflow (CHIJ) operated in open-source software (ImageJ) was trialled alongside more traditional methods for measuring dust deposition through collection of particulate matter on proxies. Results showed significant discrepancies between data acquired directly on wall painting surfaces as compared to horizontal glass slides. The advantages, limitations and complementarity of both monitoring methods were identified, and their potential contributions to the development of data-driven conservation approaches for heritage sites were assessed. The relatively low-tech methods and equipment used present useful and adapted tools for collection managers and conservators to inform their decision-making processes.     

Fear of Isolation and Perceived Affordances: The Spiral of Silence on Social Networking Sites Regarding Police Discrimination

The spiral of silence (SoS) framework elaborates the factors that determine whether individuals are willing to express their opinions in public. Although previous scholarship has examined differences in between face-to-face and computer-mediated communication, research studies have rarely tested how perceived affordances of the channel influence whether individuals express opinions or self-censor. In this study (N = 399), we examine several propositions of SoS within the context of discussing police discrimination on Facebook. To extend the theory’s relevance to social networking sites, we examined how users’ perceptions of network association, social presence, anonymity, and persistence related to opinion expression. Findings indicate support for some of the theory’s original tenets, as well as the role of multiple perceived affordances in determining whether people will express an opinion to their online social network. We discuss the implications for measuring and understanding political expression and silencing on social media as well as offline.