ORCID Profile
0000-0002-6143-297X
Current Organisations
Flinders University
,
The University of Canberra
,
Tshwane University of Technology
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Publisher: Springer Science and Business Media LLC
Date: 2012
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 10-2013
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.HUMOV.2015.07.002
Abstract: Enhanced eye-hand coordination (EHC) is associated with greater participation in physical activity. No longitudinal studies have examined the change in throw-catch EHC from childhood to mid-adolescence. We investigated the development of EHC with an object control test from childhood to mid-adolescence in boys and girls. Evaluated at age 8, 10, 12 and 16 years, EHC was measured as the aggregate success rate of a throw and wall-rebound catch test. The test involved 40 attempts of progressive increasing difficulty, as determined by increased distances from a wall and transitions from two-handed to one-handed catches. Outcomes were treated as quasi-binomial and modelled by generalised linear mixed logistic regression analysis. EHC improved with age from childhood to mid-adolescence, although boys were more adept at each age (p<0.001). The patterns of change in EHC with increasing age varied according to the degree of difficulty of the task (p<0.001) throw and two-handed catch proficiency developing earlier than throw and one-handed catch in both sexes. Boys' EHC was better than girls' as early as age 8 years and male proficiency was maintained through to mid-adolescence. The proficiency of throw and two-handed catch rates developed faster than throw and one-handed catch rates for both sexes.
Publisher: Elsevier BV
Date: 06-2015
Publisher: SAGE Publications
Date: 12-2013
DOI: 10.1260/1747-9541.8.4.769
Abstract: The purpose of this study was to determine the association between selected physical fitness parameters and club head speed (CHS) as well as carry distance (CD) in recreational golf players. The study population comprised 101 male recreational golf players (age: 38.23 +/– 16.55 y). Using the driver and iron, both CHS and CD were measured utilising Flightscope technology. Lower back flexibility (sit-and-reach), muscle resistance/endurance (sit-ups, push-ups and wall-squats), muscle resistance (back dynamometer), cardio respiratory fitness (3 minute step-test) and balance (Biodex Balance System) were also measured for each participant. A positive association was observed between lower back strength and driver CD (r = 0.470), driver CHS (r = 0.558), iron CD (r = 0.439) and iron CHS (r = 0.597). Weaker associations were observed between push-ups and driver CHS (r = 0.285) as well as wall-squats and driver CHS (r = 0.250). When compared with other physical fitness parameters in recreational golf players, lower back strength seems to account for more of the variance observed in CHS and CD. These observations tend to suggest that lower back strength is an important contributor towards the execution of the golf swing and as such should be addressed through appropriate resistance and conditioning interventions.
Publisher: Human Kinetics
Date: 09-2023
Abstract: National- and international-level rugby sevens athletes are exposed to high training and competition loads over the course of a competitive season. Research on load monitoring and body-system responses is widespread however, the primary focus has been on optimizing performance rather than investigating or improving cardiovascular health. There is a degree of cardiovascular remodeling, as well as local and systemic inflammation, in response to excessive exercise. These responses are moderated by many factors including previous exercise exposure, current exercise intensity and duration, age, race, and gender, as well as sport-specific physiology. For these reasons, high-performing female rugby sevens athletes may have a unique cardiovascular risk profile different from males and other rugby codes. This review aimed to characterize the training and competition loads, as well as the anthropometric and physiological profiles, of female rugby sevens athletes discuss the potential impacts these may have on the cardiovascular system and provide recommendations on future research regarding the relationship between rugby sevens training and competition loads and cardiovascular health. Movement demands, competition formatting, and training routines could all contribute to adverse cardiovascular adaptations. Anthropometric data and physiological characteristics may also increase the risk of cardiovascular disease. Future research needs to adopt measures of cardiovascular health to obtain a greater understanding of cardiovascular profiles and risk factors in female rugby sevens athletes.
Publisher: Wiley
Date: 22-08-2014
DOI: 10.1002/AJHB.22605
Abstract: To determine the hypothalamic-pituitary-adrenal (HPA) axis and sympathoadrenal (SA) system response to repeated bouts of downhill running. Eleven active but untrained males (age: 19.7 ± 0.4 y VO2peak 47.8 ± 3.6 ml/kg/min) performed two 60 min bouts of downhill running (-13.5% gradient), separated by 14 days, at a speed eliciting 75% of their VO2peak on a level grade. Saliva s les were collected before (baseline), after, and every hour for 12 h and every 24 h for 6 days after each run. Salivary cortisol and α-amylase levels were measured as markers of the HPA axis and SA response, respectively. Results were analyzed using repeated measures ANOVA (12 h period: 2 × 14 24 h intervals 2 × 7, P ≤ 0.05) with Tukey post-hoc tests where appropriate. Paired s les t-tests were used to compare collapsed data vs. baseline measurements. There were no significant group × time interactions for cortisol or α-amylase for the hourly s les up to 12 h after each run, nor for the 24 h s les up to 6 days later. The 24 h s les for α-amylase showed a significant group effect between runs (Run 1: 69.77 ± 7.68 vs. Run 2: 92.19 ± 7.67 U/ml P = 0.04). Significant time effects were measured for both cortisol (decreased 2 h to 12 h post-run) and α-amylase (elevated immediately after, 1 h and 2 h post-run) (P < 0.001). The 24 h period group effect for salivary α-amylase suggested an adaptation in the sympathoadrenal system that may alter the systemic inflammatory response to exercise-induced muscle damage but may also reflect enhanced mucosal immunity.
Publisher: Society of Physical Therapy Science
Date: 2012
DOI: 10.1589/JPTS.24.1239
Publisher: Canadian Science Publishing
Date: 04-2007
DOI: 10.1139/H06-106
Abstract: The purpose of this study was to examine changes in serum cytokines after repeated bouts of aerobically biased eccentric exercise. Six untrained males ran down a –13.5% treadmill grade for 60 min on two occasions (RUN1 and RUN2) at a speed equal to 75% of their VO 2 peak on a level grade runs were spaced 14 d apart. Serum was collected before, after, and every hour for 12 h, and every 24 h for 6 d. Cytokines were assessed using 17 multiplex bead technology (Bio-Rad). Creatine kinase (CK) and delayed-onset muscle soreness (DOMS) were assessed before and 24–120 h after. Results were analyzed using a repeated measures analysis of variance (p ≤ 0.05). All comparisons were between RUN1 and RUN2. CK and DOMS were significantly elevated after RUN1 compared with RUN2, indicative of a repeated bout effect. Regarding cytokines, during the initial 12 h period after RUN2, there was a 50% decrease in pro-inflammatory interleukin-6 (IL-6), a 10% decrease in pro-inflammatory macrophage chemotactic protein-1, and a 95% elevation in anti-inflammatory interleukin-10 (IL-10). Regarding 24 h periods, after RUN2 there was an 8% reduction in pro-inflammatory interleukin-8 (IL-8). However, pro-inflammatory macrophage inflammatory factor-1β (MIF-1β) was 18% higher during the 12 h after RUN2. The overall cytokine profile suggests a slight reduction in systemic inflammation after RUN2.
Publisher: Index Copernicus
Date: 08-10-2015
Publisher: BMJ
Date: 09-2005
Publisher: Index Copernicus
Date: 2012
Publisher: Termedia Sp. z.o.o.
Date: 2011
Publisher: BMJ
Date: 10-2006
Publisher: Springer Science and Business Media LLC
Date: 21-06-2014
Publisher: SAGE Publications
Date: 20-09-2012
Abstract: This paper traces the development of children’s multiplatform commissioning at the Australian Broadcasting Corporation (ABC) in the context of the digitalisation of Australian television. Whilst recent scholarship has focussed on ‘post-broadcast’ or ‘second-shift’ industrial practices, designed to engage view(s)ers with proprietary media brands, less attention has been focussed on children’s and young adults’ television in a public service context. Further, although multiplatform projects in the United States and Britain have been the subject of considerable analysis, less work has attempted to contextualise cultural production in smaller media markets. The paper explores two recent multiplatform projects through textual analysis, empirical research (consisting of interviews with key industry personnel) and an investigation of recent policy documents. The authors argue that the ABC’s mixed diet of children’s programming, featuring an educative or social developmental agenda, is complemented by its appeals to audience ‘participation’, with the Corporation maintaining public service values alongside the need to expand audience reach and the legitimacy of its brand. It finds that the ABC’s historical platform infrastructure, across radio, television and online, have allowed it to move beyond a market failure model to exploit multiplatform synergies competitively in the distribution of Australian children’s content to audiences on-demand.
Publisher: Nofer Institute of Occupational Medicine
Date: 2012
DOI: 10.2478/S13382-012-0045-3
Abstract: The aim of this study was to establish the prevalence of cardiovascular disease (CVD) risk factors amongst South African colliery executives presenting normal blood pressure (normotensive), pre-hypertension and hypertension. Selected CVD risk factors of a non-randomized, available population of 143 Caucasian male executives from five South African collieries situated in Mpumalanga and Gauteng Provinces were recorded. Executives with pre-hypertension and hypertension exhibited a higher prevalence of CVD risk factors, compared to the persons with normal blood pressure levels. The percentage of executives with CVD risk factors, with the exception of BMI, was greater amongst those with pre-hypertension than those with hypertension. The current study showed that a workplace CVD risk screening process was effective in identifying the relatively high prevalence of CVD risk factors amongst SA colliery executives. In addition, out of all the studied risk factors, undesirable body composition (BMI, WHR and fat %) exhibited the highest prevalence amongst pre-hypertensive and hypertensive SA colliery executives.
Publisher: BMJ
Date: 02-2006
Publisher: Georg Thieme Verlag KG
Date: 07-2006
Abstract: Atopic-related factors, humoral and mucosal immunoglobulins (Ig), and cortisol were measured in 17 professional cyclists competing in the 2003 Vuelta a España (a three-week multi-stage race). Venous blood and saliva s les were obtained the morning before the start of the race (T0), on the first rest day after 10 days of racing (T1), and before the start of the last stage after 21 days of racing (T2). Atopic-related factors, IgE, eosinophil cationic protein (ECP), and eosinophils, were significantly altered during the race. Serum IgE (T1: + 10 %) and ECP (salivary, T1: 113 % and serum, T2: 155 %) were significantly increased, while eosinophils (T1: - 32 %, T2: - 55 %) were significantly lower, than pre-race levels. Salivary sIgA secretion rate was significantly decreased at T2 (- 36 %). Pearson product-moment correlations revealed a modest correlation between salivary sIgA and salivary ECP (T1: r = 0.30 T2: r = 0.48 p < 0.01). Serum IgM, total IgG, IgG1, IgG2, IgA levels, at T1 and T2, and cortisol at T2, were significantly lower than pre-race levels. In conclusion, the elevation in IgE and ECP suggests an up-regulation of atopic-related factors in professional cyclists participating in the Vuelta a España. The correlation between salivary sIgA and salivary ECP indicates a role for sIgA in mediating mucosal inflammation. The alterations in Ig levels may indicate Ig isotype switching. An increasing state of hormonal fatigue may have influenced the observed immune alterations.
No related grants have been discovered for Stuart Semple.