Tracking of dietary intakes in early childhood : the Melbourne InFANT program

Background/Objectives: The objectives of the present study were to describe food and nutrient intakes in children aged 9 and 18 months, and to assess tracking of intakes between these two ages.

Subjects/Methods: Participants were 177 children of first-time mothers from the control arm of the Melbourne Infant Feeding Activity and Nutrition Trial (InFANT) Program. Dietary intake was collected at 9 and 18 months using three 24 h diet recalls. Tracking was assessed for food and nutrient intakes using logistic regression analysis and estimating partial correlation coefficients, respectively.

Results: Although overall nutrient intakes estimated in this study did not indicate a particular risk of nutrient deficiency, our findings suggest that consumption of energy-dense, nutrient-poor foods occurred as early as 9 months of age, with some of these foods tracking highly over the weaning period. Intakes of healthier foods such as fruits, vegetables, dairy products, eggs, fish and water were also relatively stable over this transition from infancy to toddlerhood, along with moderate tracking for riboflavin, iodine, fibre, calcium and iron. Tracking was low but close to ρ=0.3 for zinc, magnesium and potassium intakes.

Conclusions: The tracking of energy-dense, nutrient-poor foods has important implications for public health, given the development of early eating behaviours is likely to be modifiable. At this stage of life, dietary intakes are largely influenced by the foods parents provide, parental feeding practices and modelling. This study supports the importance of promoting healthy dietary trajectories from infancy.

Negotiating emotions, rethinking otherness in suburban Melbourne

I argue that research that tries to makes sense of emotion provides a better understanding of the politics and ethics of doing face-to-face research. Reflecting on in-depth interviews with people who live and/or work in Dandenong, an outer suburban area of Melbourne, I draw attention to the emotional dimensions of the research process. In particular I focus on moments when the exercise of white privilege made it difficult to negotiate emotions. These were moments when the intersection of my ethnicity with my position as a new settler in Dandenong made me feel excluded. The outcome was that I found it hard to value the voice of participants who were eager to help me with my research. A critical reflection of the emotions produced during such interpersonal encounters, however, has enabled me to rethink moments when the Self/Other binary unintentionally emerged. Critical self-reflexivity that is attentive to emotions gave me the opportunity to move closer to my goal of being an ethical researcher.

Interethnic understanding and belonging in suburban Melbourne

Modelling and mapping ethnicity is a methodological approach used to understand the changing socio-spatial structure of the city. Such an approach uses a range of indicators to identify ethnic groups, map them in urban space and explain the changing nature of ethnic concentrations. The unintended consequences, however, are the labelling, marginalisation and exclusion of ethnic minorities. Critical approaches, in contrast, focus on making visible the politics of representation that mark and stereotype ethnic minorities and ethnic concentrations. Within contemporary research on ethnicity such work has drawn attention to the exercise of power in the constitution of ethnic identities, the invisibility of whiteness and the inherent tensions that are likely to arise in negotiating ethnic cultural differences in local places. Although this article draws attention to such tensions in a particular place, Dandenong, it engages in this discussion to argue that the everyday negotiation of cultural difference also provides the potential to blur fixed ethnic boundaries and contribute to interethnic understanding and a sense of belonging. Drawing on in-depth interviews with people who live and/or work in Dandenong, suburban Melbourne, this article underlines that such positive insights from everyday multiculturalism have the potential to inform and broaden policy debates on diversity and social inclusion in the multicultural city.

Quantification of tackling demands in professional Australian football using integrated wearable athlete tracking technology

Objectives
To describe and quantify the frequency, velocity and acceleration at impact during tackling in Australian football using a combination of video and athlete tracking technology.

Design
Quasi-experimental.

Methods
Data was collected from twenty professional Australian Football League players during four in-season matches. All tackles made by the player and those against the player were video-coded and time stamped at the point of contact and then subjectively categorised into low, medium and high intensity impact groups. Peak GPS and acceleration data were identified at the point of contact. Two-way analysis of variance was used to assess differences (p < 0.05) between tackle type (made and against) and tackle intensity.

Results
A total of 173 tackles made and 179 tackles against were recorded. Significant differences were found between all tackle intensity groups. Peak velocity was significantly greater in high (19.5 ± 6.1 km h&minus;1) compared to medium (13.4 ± 5.8 km h&minus;1) and low intensity (11.3 ± 5.0 km h&minus;1) tackles. Peak Player Load™, a modified vector magnitude of tri-axial acceleration, was significantly greater in high (7.5 ± 1.7 a.u.) compared to medium (4.9 ± 1.5 a.u.) and low intensity (4.0 ± 1.3 a.u.) tackles.

Conclusions
High intensity tackles, although less frequent, are significantly greater in speed of movement immediately prior to contact and in the resultant impact acceleration compared to tackles of lower intensity. Differences in accelerometer data between tackles observed to be progressively greater in intensity suggest a level of ecological validity and provide preliminary support for the use of accelerometers to assess impact forces in contact invasion sports.

Perceptions of wellness to monitor adaptive responses to training and competition in elite Australian football

Perceptions of wellness are often used by athletes and coaches to assess adaptive responses to training. The purpose of this research was to describe how players were coping with the demands of elite level Australian football over a competitive season using subjective ratings of physical and psychological wellness and to assess the ecological validity of such a monitoring approach. Twenty-seven players completed ratings for 9 items (fatigue, general muscle, hamstring, quadriceps, pain/stiffness, power, sleep quality, stress, well-being). Players subjectively rated each item as they arrived at the training or competition venue on a 1–5 visual analog scale, with 1 representing the positive end of the continuum. A total of 2,583 questionnaires were analyzed from completions on 183 days throughout the season (92 ± 24 per player, 103 ± 20 per week; mean ± SD). Descriptive statistics and multilevel modelling were used to understand how player ratings of wellness varied over the season and during the week leading into game day and whether selected player characteristics moderated these relationships. Results indicated that subjective ratings of physical and psychological wellness were sensitive to weekly training manipulations (i.e., improve steadily throughout the week to a game day low, p < 0.001), to periods of unloading during the season (i.e., a week of no competition, p < 0.05) and to individual player characteristics (e.g., muscle strain after a game was poorer in players with high maximum speed, p < 0.01). It is concluded that self-reported player ratings of wellness provide a useful tool for coaches and practitioners to monitor player responses to the rigorous demands of training, competition, and life as a professional athlete.

Home based business in suburban peripheral regions and government policy: a case study of Casey, Melbourne, Australia

Home based businesses (HBB) are increasingly becoming an alternative to salaried employment. This research explores the potential for HBB to contribute significantly to the economic development of peripheral metropolitan centres. Without economic development, these centres remain dormitory suburbs with unresolved associated social and ecological issues. By mapping the diversity and limitations of HBB in the City of Casey, an outer suburban peripheral area of Melbourne, Australia, this study aims to evaluate what exists and the response by governments at all levels to further business development. This study finds that the role of government is restricted to broad initial start-ups, with no programs or support for the type of innovative HBB that need to be husbanded and encouraged to grow outside of the narrow confines of their home base.