Effects of creatine loading and prolonged creatine supplementation of body composition, fuel selection, sprint and endurance performance in humans

Most research on creatine has focused on short-term creatine loading and its effect on high-intensity performance capacity. Some studies have investigated the effect of prolonged creatine use during strength training. However, studies on the effects of prolonged creatine supplementation are lacking. In the present study, we have assessed the effects of both creatine loading and prolonged supplementation on muscle creatine content, body composition, muscle and whole-body oxidative capacity, substrate utilization during submaximal exercise, and on repeated supramaximal sprint, as well as endurance-type time-trial performance on a cycle ergometer. Twenty subjects ingested creatine or a placebo during a 5-day loading period (20g·day^-1) after which supplementation was continued for up to 6 weeks (2g·day^-1). Creatine loading increased muscle free creatine, creatine phosphate (CrP) and total creatine content (P<0.05). The subsequent use of a 2g·day^-1 maintenance dose, as suggested by an American College of Sports Medicine Roundtable, resulted in a decline in both the elevated CrP and total creatine content and maintenance of the free creatine concentration. Both short- and long-term creatine supplementation improved performance during repeated supramaximal sprints on a cycle ergometer. However, whole-body and muscle oxidative capacity, substrate utilization and time-trial performance were not affected. The increase in body mass following creatine loading was maintained after 6 weeks of continued supplementation and accounted for by a corresponding increase in fat-free mass. This study provides definite evidence that prolonged creatine supplementation in humans does not increase muscle or whole-body oxidative capacity and, as such, does not influence substrate utilization or performance during endurance cycling exercise. In addition, our findings suggest that prolonged creatine ingestion induces an increase in fat-free mass.

Cataloguers: the new endangered species

While cataloguing has always been a traditional librarian specialisation it has been questioned whether librarians and their professional skills are still needed to perform such tasks. This paper revisits the question of the future evolution and/or possible extinction of cataloguing and cataloguers and asks is there a role for cataloguers’ skills in the future? What will those roles look like? How do we prepare future librarians for these roles? These question will be answered by sharing Lesa Maclean’s personal transformation from cataloguer to metadata specialist, a common transformation today; examination of a selection of literature from the last decade; as well as results of original research into the perceptions of the future role of cataloguers, based on a survey. Results support the view that cataloguers are ensuring their own survival in the future by taking on a proactive role in today’s information society.

Dean's great discovery : multiplication, division and fractions

Multiplication, division and fractions are 'hotspots' for students in the middle years with many students experiencing difficulty with these concepts (Siemon, Virgona & Cornielle, 2001). Arrays effectively model multiplication and help children develop multiplicative thinking and learn multiplication facts (Young-Loveridge, 2005). In this article we show how an open-ended array problem enabled a Grade 5/6 student to think about the relationship between multiplication, division and fractions. In the article we describe the project and 'hot spot' mathematical tasks that we used and provide some background on multiplicative thinking before presenting the case and a commentary (Western Melbourne Roundtable, 1997) of one student's exploration. This case was documented whilst we were working on a collaborative project with a team of upper primary teachers and a group of pre-service teachers at a local primary school.

High level segmentation of instructional videos based on content density

Automatically partitioning instructional videos into topic sections is a challenging problem in e-learning environments for efficient content management and cataloging. This paper addresses this problem by proposing a novel density function to delineate sections underscored by changes in topics in instructional and training videos. The content density function draws guidance from the observation that topic boundaries coincide with the ebb and flow of the 'density' of content shown in these videos. Based on this function, we propose two methods for high-level segmentation by determining topic boundaries. We study the performance of the two methods on eight training videos, and our experimental results demonstrate the effectiveness and robustness of the two proposed high-level segmentation algorithms for learning media.

The more things change, the more they stay the same : the 2012 alternative film/video festival

The Alternative Film/Video Festival in Belgrade has historically been one of a triumvirate of critical festivals, with Pula’s MAFAF (1965-1990) and Zagreb’s initiating GEFF (1963-70), servicing experimental, exploratory, avant-garde, personal film in the former Yugoslavia, at Belgrade’s Academic Film Center (AFC) within the Student City Cultural Centre (DKSG). Initiated in 1982 it was resurrected in 2003 with a dual regional and international focus after a hiatus due to the collapse of the socialist states of the former Yugoslavia. As well as a series of curated and retrospective programs each competition program is now split into international and regional halves, selected by Greg de Cuir and Zoran Saveski with production support by Milan Milosavljević. Two film workshops were also available. One on scratch film by Ivan Ladislav Galeta, the other on filming and processing led by Vassily Bourakis. Initiated by de Cuir the first Alternative Film/Video Research Forum was part of the festival this year bringing together research on alternative/ experimental/ avant-garde/ underground film and video. Although I participated in this side-bar I will concentrate here more on discussions from the festival roundtable and contextualise a small number of films, a couple from competition but mainly regional work that I would find difficult to encounter without attendance here.