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Hrysomallis C.,Victoria University | Buttifant D.,Sport Science
Journal of Science and Medicine in Sport | Year: 2012

Objectives: To determine if upper-body strength or power changes during the competitive season for elite Australian rules footballers and what influence the number of training years has on any changes. Design: Repeated measures. Methods: Twenty elite Australian rules footballers were assessed at preseason, in-season and postseason. Strength was assessed by the 1 Repetition Maximum bench press and power was assessed by bench press throws. Athletes' results were analysed as a whole group as well as being divided into two groups according to training years: less than 3 years training and greater than 3 years training. All athletes performed the same resistance training program. Results: There were no significant differences in height, body mass, or skinfold measurements between the two age groups. As a whole group, there was no significant change in 1RM bench press. There was a small but significant decrease in mean bench throw power in-season (525. W) compared to preseason (542. W) and it then increased at postseason (541. W). Within group analysis revealed the in-season decrease in upper-body power was largely pertaining to the younger athletes. The older group maintained their upper body power levels while the younger group decreased power in-season (4%) before regaining it at season's end. Conclusion: Older footballers were able to maintain their upper body power while the younger footballers had a small but significant decrease in-season before regaining it by season's end. The overall volume of training and playing appears to have affected the younger athletes' power more than older athletes. Both age groups maintained upper body strength. © 2012 Sports Medicine Australia. Source

This paper investigates the effect of dissemination of corporate disclosure via Twitter. In particular, the study is focused on listed companies in Australia that employed Twitter as a secondary dissemination channel for corporate announcements in 2008–2013. Based on a sample of 3,516 announcements at the Australian Stock Exchange (ASX) related to 109 listed companies, the research employs the Investor Recognition Hypothesis to investigate the effect of Twitter activity on the information asymmetry proxied by abnormal spread (SpreadAbn). The findings show that there is a negative association between SpreadAbn and tweets posted by a firm during the announcement period. Further analysis shows that this association is stronger for firms less visible through business press or financial analyst coverage. The study concludes that while corporate announcements are publicly available through the ASX platform, dissemination of corporate announcements through Twitter allows companies to attract investors’ attention and decrease information asymmetry. © 2015, American Accounting Association. All rights reserved. Source

Wilcock D.,Victoria University | Brierley G.,University of Auckland | Howitt R.,Macquarie University
Progress in Physical Geography | Year: 2013

Geomorphology offers an effective entry point into wider debates across geography and the sciences, framing understandings of landscapes as manifestations of complex and emergent relationships that can be used as a platform to support conversations among multiple and diverse worldviews. Physical geographers have much to contribute in moving beyond monological (one only) views of landscapes. This paper draws upon concepts of emergence, connectivity and space-time relationality to develop an 'ethnogeomorphic' outlook upon biophysical-and-cultural ('living') landscapes. This perspective is grounded through ethnographic case studies with Indigenous1 communities in Australia and Canada that examine knowledge production and concerns for environmental negotiation and decision-making. Extending beyond a traditional approach to ethnosciences, ethnogeomorphology seeks to move beyond cross-disciplinary scientific disciplines (and their associated epistemologies) towards a shared (if contested) platform of knowledge transfer and communication that reflects multiple ways of connecting to landscapes. Convergent perspectives upon landscape understandings are highlighted from Indigenous knowledges and emerging, relational approaches to geomorphic analysis. Ethnogeomorphology presents a situated, non-relativist response to people-landscape connections that reflects and advocates sentient relationships to place. Potential applications of ethnogeomorphology as an integrating theme of geographic inquiry are explored, highlighting important tensions in the knowledge production process. © The Author(s) 2013. Source

Farrow D.,Victoria University | Farrow D.,Australian Institute of Sport | Reid M.,Sports Science and Medicine
Journal of Science and Medicine in Sport | Year: 2012

Objectives: To determine the contribution of situational probability information to the anticipatory responses of skilled tennis players representative of two different stages of development. Design: Participants were required to predict the location of tennis serves presented to them on a plasma touchscreen from the perspective of the receiver. Methods: Serves were sequenced into a series of games and sets with a score presented before each point, typical of a game of tennis. The game score was manipulated to provide advance probability information. The location of the serve for the first point of each game was always directed to the same location. A total of 12 service games consisting of 96 points were presented with interest in whether players would detect the relationship between the game score and resultant serve location. Results: A 2×12 (age×service game) ANOVA with repeated measures on the second factor revealed a significant age by service game interaction for response time (F 11,297=3.86, p<0.05, η p 2=.12). The older players picked up the occurrence of the first point service pattern after the ninth service game whereas the younger, players did not. There were no significant response accuracy differences between the groups in relation to the first point. Conclusions: The findings highlight the important role of situational probability information, in addition to movement kinematics, for successful anticipatory performance and suggest that the pick-up of such information is not utilised by younger players. © 2012 Sports Medicine Australia. Source

Aughey R.J.,Victoria University
Journal of Science and Medicine in Sport | Year: 2010

Real-time (RT) GPS is used to monitor performance during Australian Football matches. Typically athlete targets monitored in RT are set from post-game (PG) data. The validity of RT compared to PG data is not yet known. This study compared RT data for key parameters to those obtained PG, using MinimaxX GPS. RT was different to PG for jog 4.2-5.0, run 5.0-6.9, sprint 6.9-10.0 m s -1, and total distance (CV = 6.4-19.6%). The signal to noise ratio was low for jog and run distance. For sprint noise exceeded the signal, with the opposite true for total distance. Caution must be applied if using RT data to monitor performance, especially if targets are set for players using PG data. © 2009 Sports Medicine Australia. Source

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