Investigating students’ perceptions of instructional strategies to establish social presence

Social presence is a popular construct used to describe how people socially interact in online courses. Online educators continue to try different ways to establish and maintain social presence in online courses. However, research to date has not identified which strategies, or types of strategies, are best for establishing social presence. We investigated student perceptions of various strategies of establishing and maintaining social presence using a mixed methods case study approach in two different fully online courses. Results suggest that students are more interested in connecting with their instructor than their peers; different students like different social presence strategies; and students have different overall social presence needs. Various strategies and implications for practice are addressed throughout.     

Imaginary subjects: school science,indigenous students,and knowledge–power relations

The perspectives of indigenous science learners in developed nations offer an important but frequently overlooked dimension to debates about the nature of science, the science curriculum, and calls from educators to make school science more culturally responsive or ‘relevant’ to students from indigenous or minority groups. In this paper the findings of a study conducted with indigenous Maori children between the ages of 10 and 12 years are discussed. The purpose of the study was to examine the ways that indigenous children in an urban school environment in New Zealand position themselves in relation to school science. Drawing on the work of Basil Bernstein, we argue that although the interplay between emergent cultural identity narratives and the formation of ‘science selves’ is not as yet fully understood, it carries the potential to open a rich seam of learning for indigenous children.     

Magnitude of multiplanar breast kinematics differs depending upon run distance

Recommendations for breast support, dynamic breast pain assessment, and implications for sports performance have been made within breast biomechanics research; however, these studies have been based upon short exercise protocols (2–5 min). The aim of this study was to investigate the effect of breast support on multiplanar breast kinematics over a 5-kilometre run. Ten female participants (34D or 32DD) conducted two 5-kilometre runs, in a low and high breast support. Relative multiplanar breast kinematics were averaged over five gait cycles at six intervals of a 5-kilometre run. Increases in multiplanar breast kinematics were reported from the start to the end of the run, with the greatest rate of increase in breast kinematics reported within the first two kilometres of running. The greatest relative increases in breast range of motion (34%), velocity (33%), and acceleration (41%) were reported in the superioinferior direction at the fifth kilometre (33 min of running) in the high breast support. Key findings suggest that the run distance, and therefore run duration, employed for both fundamental research and product validation protocols should be carefully considered and it is suggested that running protocols for assessing breast biomechanics should exceed 7 min.     

Breast motion asymmetry during running

Breast asymmetry is common in females, despite a similar driving force; dynamic activity may result in asymmetrical breast motion. This preliminary study investigated how breast categorisation (left/right or dominant/non-dominant) may affect breast support recommendations and its relationship with breast pain. Ten females ran on a treadmill at 10 kph in three breast supports (no bra, everyday bra, sports bra). Five reflective markers on the thorax and nipples were tracked using infrared cameras (200 Hz) during five running gait cycles in each breast support. Multiplanar displacements of both breasts were calculated relative to the thorax. Although the maximum individual participant difference was 2.4 cm (mediolaterally) between the left and right breast, no left/right differences were found in any direction or support condition. Notably, correlations between breast pain and anterioposterior breast displacement were stronger with the left breast (r = 0.614) and moderate with the right breast (r = 0.456). Following participant categorisation according to the greatest magnitude of superioinferior breast displacement (dominant breast), results showed significant differences in displacement for all directions across different breast supports. When using breast kinematic data to examine relationships with breast pain or to recommend breast support requirements, data on both breasts should be collected.     

THE GERIATRIC INTERDISCIPLINARY TEAM APPROACH: CHALLENGES AND OPPORTUNITIES IN EDUCATING TRAINEES TOGETHER FROM A VARIETY OF DISCIPLINES

The special health needs of older persons and the organization of managed care systems necessitate interdisciplinary team health care. However, there is a paucity of training or familiarity with team care among most health care professionals. This article describes one nationwide initiative, funded by the John A. Hartford Foundation, in which eight sites trained health care workers from different disciplines to participate as interdisciplinary geriatric health care team members. Although the goal of the initiative was to develop trained interdisciplinary team participants, a major concern of the programs was the initial overcoming of challenges to training professionals from different disciplines together. Both benefits and challenges are identified and several training modalities and techniques to meet the challenges are discussed. These include case studies, standardized patients, cross-discipline role-playing, glossaries, and use of the DISC Personality Profile. The benefits of each of these modalities are examined, and potential pitfalls and perils to be avoided are emphasized.     

Artists,employment and the Great Recession: A cross-sectional analysis using US Current Population Survey data

This paper uses cross-sectional data from the US Current Population Survey to examine employment behavior among artists before and after a major period of economic transition – the Great Recession. The analysis looks at employment behavior among artists as an occupational group compared to other creative class workers and analyzes trends in periods before, during and after the recession. The results suggest that as a result of the downturn, many artists changed occupations to non-arts-related work or left the workforce altogether; artists became self-employed, and new artists opted for self-employment over wage/salary work; artists were disproportionately adversely impacted – either unemployed or underemployed – than other types of workers. Level of educational attainment was a significant determinant of whether an artist maintained quality employment and stayed in the occupation of his choice; and gender and marital status had a bearing on artists' ability to remain employed as an artist and maintain quality employment. The analysis emphasizes the importance of examining specific occupations within the creative class before drawing broad conclusions pertaining to all occupations with this title. Future work will test the conclusions in this study by using longitudinal data on artists.     

Mucosal immunity and upper respiratory tract infections during a 24-week competitive season in young ice hockey players

The aim of this study was to examine upper respiratory tract infections (URTI) and their associations with resting saliva and blood immune and endocrine parameters in ice hockey players. Twenty-seven participants (age 16.5 ± 0.5 years) completed the 24-week study period. The counts/concentrations of immune and endocrine markers were compared between healthy-prone athletes (≤2 episodes of URTI during the study period) and illness-prone athletes (≥3 episodes of URTI) and between the URTI state (when athletes had infections) and the healthy state (the time without URTI). There were no differences in concentration/counts of saliva and blood immune and endocrine parameters between the illness-prone and illness-free athletes. Athletes had significantly lower sIgA, sIgA1 and sIgA2 concentrations (sIgA: 119.88 ± 66.88, 144.10 ± 75.0 µg/ml; sIgA1: 90.2 ± 40.64, 108.44 ± 29.8 U; sIgA2: 67.58 ± 30.1, 80.3 ± 25.61 U, respectively) and significantly higher WBC, neutrophil, monocyte and eosinophil count values and IL-1ra concentration at the time when they had symptoms of URTI than in the period without symptoms of infections. There were no differences in salivary cortisol concentration between the period of URTI symptoms and the period without URTI symptoms. In conclusion, we observed lower concentrations of salivary immunoglobulins and higher levels of blood immune parameters during URTI in athletes, which may confirm the suppression of mucosal immunity and initiation responses to pathogenic infections by innate immunity.     

Correlation network analysis shows divergent effects of a long-term,high-fat diet and exercise on early stage osteoarthritis phenotypes in mice

Background:Obesity increases knee osteoarthritis(OA) risk through metabolic,inflammatory,and biomechanical factors,but how these systemic and local mediators interact to drive OA pathology is not well understood.We tested the effect of voluntary running exercise after chronic diet-induced obesity on knee OA-related cartilage and bone pathology in mice.We then used a correlation-based network analysis to identify systemic and local factors associated with early-stage knee OA phenotypes among the different diet and exercise groups.Methods:Male C57 BL/6 J mice were fed a defined control(10% kcal fat) or high fat(HF)(60% kcal fat) diet from 6 to 37 weeks of age.At 25 weeks,one-half of the mice from each diet group were housed in cages with running wheels for the remainder of the study.Histology,micro computed tomography,and magnetic resonance imaging were used to evaluate changes in joint tissue structure and OA pathology.These local variables were then compared to systemic metabolic(body mass,body fat,and glucose tolerance),inflammatory(serum adipokines and inflammatory mediators),and functional(mechanical tactile sensitivity and grip strength) outcomes using a correlation-based network analysis.Diet and exercise effects were evaluated by two-way analysis of variance.Results:An HF diet increased the infrapatellar fat pad size and posterior joint osteophytes,and wheel running primarily altered the subchondral cortical and trabecular bone.Neither HF diet nor exercise altered average knee cartilage OA scores compared to control groups.However,the coefficient of variation was≥25% for many outcomes,and some mice in both diet groups developed moderate OA(>33% maximum score).This supported using correlation-based network analyses to identify systemic and local factors associated with early-stage knee OA phenotypes.In wheel-running cohorts,an HF diet reduced the network size compared to the control diet group despite similar running distances,suggesting that diet-induced obesity dampens the effects of exercise on systemic and local OA-related factors.Each of the 4 diet and activity groups showed mostly unique networks of local and systemic factors correlated with early-stage knee OA.Conclusion:Despite minimal group-level effects of chronic diet-induced obesity and voluntary wheel running on knee OA pathology under the current test durations,diet and exercise substantially altered the relationships among systemic and local variables associated with early-stage knee OA.These results suggest that distinct pre-OA phenotypes may exist prior to the development of disease.