La Trobe University

About: La Trobe University is a education organization based out in Melbourne, Victoria, Australia. It is known for research contribution in the topics: Population & Health care. The organization has 13370 authors who have published 41291 publications receiving 1138269 citations. The organization is also known as: LaTrobe University & LTU.

Foot posture influences the electromyographic activity of selected lower limb muscles during gait

Abstract: Some studies have found that flat-arched foot posture is related to altered lower limb muscle function compared to normal- or high-arched feet. However, the results from these studies were based on highly selected populations such as those with rheumatoid arthritis. Therefore, the objective of this study was to compare lower limb muscle function of normal and flat-arched feet in people without pain or disease. Sixty adults aged 18 to 47 years were recruited to this study. Of these, 30 had normal-arched feet (15 male and 15 female) and 30 had flat-arched feet (15 male and 15 female). Foot posture was classified using two clinical measurements (the arch index and navicular height) and four skeletal alignment measurements from weightbearing foot x-rays. Intramuscular fine-wire electrodes were inserted into tibialis posterior and peroneus longus under ultrasound guidance, and surface EMG activity was recorded from tibialis anterior and medial gastrocnemius while participants walked barefoot at their self-selected comfortable walking speed. Time of peak amplitude, peak and root mean square (RMS) amplitude were assessed from stance phase EMG data. Independent samples t-tests were performed to assess for significant differences between the normal- and flat-arched foot posture groups. During contact phase, the flat-arched group exhibited increased activity of tibialis anterior (peak amplitude; 65 versus 46% of maximum voluntary isometric contraction) and decreased activity of peroneus longus (peak amplitude; 24 versus 37% of maximum voluntary isometric contraction). During midstance/propulsion, the flat-arched group exhibited increased activity of tibialis posterior (peak amplitude; 86 versus 60% of maximum voluntary isometric contraction) and decreased activity of peroneus longus (RMS amplitude; 25 versus 39% of maximum voluntary isometric contraction). Effect sizes for these significant findings ranged from 0.48 to 1.3, representing moderate to large differences in muscle activity between normal-arched and flat-arched feet. Differences in muscle activity in people with flat-arched feet may reflect neuromuscular compensation to reduce overload of the medial longitudinal arch. Further research is required to determine whether these differences in muscle function are associated with injury.

The antecedents of organizational commitment: the case of Australian casual academics

Abstract: Purpose – Despite the increasing attention of organizational commitment in the management literature, most studies predominantly focus on full-time workers in traditional work settings. This paper examined the antecedents of organizational commitment among casual academics working in the tertiary education sector in Australia. Design/methodology/approach – A questionnaire survey was developed and distributed to casual academics working in a large Australian public university. Findings – Analysis of the data shows that personal characteristics (gender, marital status, family responsibilities and education), job-related characteristics (supervisor support, co-worker support, role clarity and resource availability) and job involvement characteristics (tenure, second job and post-graduate study at the employing university) all impact on organizational commitment. Research limitations/implications – Australian tertiary institutions are prominent employers of casual workers, however, very little is known about the work behavior of this group of academics. The results of this study highlight important directions for implementing strategies to increase casual academic's organizational commitment. Organization commitment is important because it is known association with other important organizational variables such as turnover, absenteeism and work effort. Originality/value – Given the increasing reliance on casual academics in tertiary institutions, this study provides the first step in better understanding the factors that affect the organization commitment of casual academics.

Fine‐scale genetic structure, estuarine colonization and incipient speciation in the marine silverside fish Odontesthes argentinensis

Abstract: The idengification of incipient ecological species represents an opportunity to investigate current evolutionary process where adaptive divergence and reproductive isolation are associated. In this study we analysed the genetic structure of marine and estuarine populations of the silverside fish Odontesthes argentinensis using nine microsatellite loci and 396 bp of the mitochondrial DNA (mtDNA) control region. Our main objective was to investigate the relationship among estuarine colonization, divergent selection and speciation in silversides. Significant genetic structure was detected among all marine and estuarine populations. Despite the low phylogeographic structure in mtDNA haplotypes, there was clear signal of local radiations of haplotypes in more ancient populations. Divergence among marine populations was interpreted as a combined result of homing behaviour, isolation by distance and drift. On the other hand, ecological shifts due to the colonization of estuarine habitats seem to have promoted rapid adaptive divergence and reproductive isolation in estuarine populations, which were considered as incipient ecological species. This conclusion is supported by the existence of a set of environmental factors required for successful reproduction of estuarine ecotypes. The pattern of genetic structure indicates that phenotypic and reproductive divergence evolved in the face of potential gene flow between populations. We suggest that the ‘divergence-with-gene-flow’ model of speciation may account for the diversification of estuarine populations. The approach used can potentially idengify ‘incipient estuarine species’, being relevant to the investigation of the evolutionary relationships of silversides in several coastal regions of the world.

Online learning: enhancing nurse education?

Abstract: Online learning: enhancing nurse education? Aims of the study. The aim of this study was to explore the experiences of nursing students with `online' learning. Background. The need to integrate information technology into nursing education has been recognized and well documented. In spite of this, information technology remains a neglected subject in many nursing programmes. Strategies have been considered for increasing the integration of information technology in nursing education. One of the key issues identified is the need for research into the factors that contribute to optimal learning with information technology, specifically the need to explore issues that contribute to student frustration and satisfaction with learning. Within Australia, the incorporation of information technology as a core subject in nursing education is still relatively new. This article describes how one university used `online' learning to expose students to conceptual and experiential opportunities that enabled them to develop skills in the management of information technology. Methods. Twenty-one students participated in this qualitative study. Individual interviews were used to develop insights into student perceptions. Thematic analysis enabled refined themes to emerge. These themes formed the basis of focus group discussions. Focus groups were used to enhance and validate the information from one-to-one interviews by using group dynamics to add experiential richness to the data. Findings. Four major themes emerged: computer confidence, flexibility, active learning and practicalities of teaching. Conclusions. The integration of information technology into nursing education requires a dramatic change in thinking. The `learning curve' is steep for both student and educator and there are many issues that need to be considered. This research does not aim to provide solutions to the issues highlighted but rather offers recommendations for enhancing the teaching and learning experience.

Impact of the Nordic hamstring and hip extension exercises on hamstring architecture and morphology: implications for injury prevention

Abstract: Background The architectural and morphological adaptations of the hamstrings in response to training with different exercises have not been explored. Purpose To evaluate changes in biceps femoris long head (BFLH) fascicle length and hamstring muscle size following 10-weeks of Nordic hamstring exercise (NHE) or hip extension (HE) training. Methods 30 recreationally active male athletes (age, 22.0±3.6 years; height, 180.4±7 cm; weight, 80.8±11.1 kg) were allocated to 1 of 3 groups: (1) HE training (n=10), NHE training (n=10), or no training (control, CON) (n=10). BFLH fascicle length was assessed before, during (Week 5) and after the intervention with a two-dimensional ultrasound. Hamstring muscle size was determined before and after training via MRI. Results Compared with baseline , BFLH fascicles were lengthened in the NHE and HE groups at mid-training (d=1.12–1.39, p<0.001) and post-training (d=1.77–2.17, p<0.001) and these changes did not differ significantly between exercises (d=0.49–0.80, p=0.279–0.976). BFLH volume increased more for the HE than the NHE (d=1.03, p=0.037) and CON (d=2.24, p<0.001) groups. Compared with the CON group, both exercises induced significant increases in semitendinosus volume (d=2.16–2.50, ≤0.002) and these increases were not significantly different (d=0.69, p=0.239). Conclusion NHE and HE training both stimulate significant increases in BFLH fascicle length; however, HE training may be more effective for promoting hypertrophy in the BFLH.