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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Effect of workload, upper body posture, and saddle set-back on full body angular joint kinematics, muscle activity, and lower limb haemodynamics

Edmundson, Christopher James January 2008 (has links)
'Cycling is one of the toughest sports and one of the most complex to analyse in scientific terms.' - Mr Hein Verbruggen,P residentU nion Cycliste International 1991-2005. Despite extensive research into sagittal plane lower limb cycling kinematics there is little scientific literature available investigating the three-dimensional joint kinematics of the cyclist, and especially so regarding the kinematics of the pelvis, trunk, and arms, and how these are affected by workload, upper body posture, and saddle setback. This Thesis developed a comprehensive full-body three dimensional kinematic model and then determined the effects of workload, Upper Body Posture, and Saddle Setback on the leg, trunk, and arm kinematics of the cyclist. Competitive cycling has an extremely high aerobic component, and yet ironically there have been few studies investigating how workload or riding position affect lower limb blood flow haemodynamics. By using Near-Infrared Spectroscopy a cycling specific technique was developed to enable tissue oxygenation status of the lower limbs to be determined during cycling, which was then used to assess the effects of workload, trunk and hip angle, and saddle set-back on lower limb blood flow haemodynamics. It is unclear to what extent saddle setback affects lower limb and trunk muscle activity and cycling performance, and yet the sub-disciplines of cycling use markedly different bicycle set-ups. By using a custom cycle ergometer developed by the author this Thesis systematically assessed the effects of saddle setback on muscle recruitment and activation magnitude. When investigating the effects of bicycle set-up on cycling performance it is important to consider all the physiological and biomechanical determinants of success in unison, and how they inter-relate. To date there are no studies that have comprehensively studied the kinematic, haemodynamic, electromyographic, and associated crank kinetics simultaneously. As such this Thesis developed a methodology to evaluate the effects of changing workload, upper body posture, and saddle setback on fullbody three-dimensionalk inematics, lower limb blood flow haemodynamicsl,e g and trunk electromyography, and crank torque profiles, in order to arrive at the optimum riding position and highlight the compromises required when aiming to maximise cycling performance. The effects of workload were assessed by undertaking a 25W. min" graded maximal exercise test to exhaustion. In order to assess the kinematic, haemodynamic, and electromyographic effects of altering riding position a custom independently adjustable cycle ergometer was developed to permit precise accurate adjustment of the four main macro settings (saddle height and setback, and saddle to handlebar reach and drop) while maintaining the spatial coordinates of the other parameters. Three Upper Body Postures (Hoods,D rops and a Time Trial position), and six SaddleS etbacksw ere used (100,50, and Omm behind the bottom bracket, and 50,100, and 150mm in front of the bottom bracket). For all three studies three-dimensional full body kinematics were recorded using a stereophotogrammetricin fra-red motion capture system. Leg and trunk muscle activity were recorded using an 8-lead surface electromyographic system, and tissue oxygenation levels were recorded using Near Infrared Spectroscopy on the Vastus Lateralis. Corresponding crank torque profiles were measured simultaneously using a crank dynamometer. Increasesi n workload produced progressived ecreasesin Oxyhaemoglobina nd pedalling smoothnessin dex, and continual increasesin total haemoglobinc ontenta nd muscle activity in the majority of muscle groups, but produced little change in full-body kinematics until 80% maximal aerobic power was surpassedC. hanging from the Hoods to the Drops and into a Time Trial position had little effect on lower and upper limb kinematics, but produced significant increases in all lower limb muscle activity except the gluteus maximus, as well as considerable reductions in tissue oxygenation status, and resulted in cyclists pedalling with greater peak torque values. Moving the saddle forwards significantly affected joint kinematics, muscle activity, tissue oxygenation status, and the crank torques profiles. A saddle positioned with the nose directly over the bottom bracket minimised angular rotations of the ankle, knee, hip, and trunk as well as global muscle activation. Tissue oxygenation status was also significantly higher using this setting, suggesting that although an aerodynamic cycling position must take priority, setting the saddle with the nose directly over the bottom bracket and maintaining the operating range of motion at the hip and knee appears to maximise cycling performance, and that the spinal kinematics appear to act as a torque-induced engine by means of increases in axial rotation magnitude in the lumbar, mid-thoracic and thoracic spinal segments.
22

The influence of footwear and surfaces on performance and injury potential in running

Marcus, Beth A. January 1983 (has links)
The focus of this project was to detect differences in running gait (at a fixed speed) induced by differences in shoes and surfaces. A review of the literature indicated that improvements in the measurement and analysis techniques were necessary to yield results accurate and reliable enough to. detect these differences. A pilot study was therefore performed to evaluate the magnitude of the measurement errors and the repeatibility of the results. One subject completed 98 trials (emcompassing 10 different shoe­surface conditions) at a fixed speed (approximately 4.46 m/sec) and the vertical (FZ) and horizontal (FY) ground reaction forces were measured. Parameters were developed ·to completely describe the characteristics of the ground reactions (FZ, FY). A statistical analysis performed using these parameters concluded that 10 trial repetitions were required for a reliable result. An X-ray study of one subject was also performed. This study evaluated the errors due to skin markers ( used for filming) moving with respect to the underlying bone. As a result of the X-ray study a new technique to reduce the marker motion errors was developed, tested and found to be potentially powerful. On the basis of the pilot study, the main experiment was designed to test five male subjects under four shoe-surface conditions. High speed films in conjunction with force platform data were collected. A two-dimensional model of the human leg was employed to yield resultant forces and moments at four joints (hip, knee, ankle and metatarsophalangeal). Parameters were developed to describe these resultants. The force parameters, joint resultant parameters and shoe /surface parameters (from friction, resilience and flexibility tests of the shoes) were correlated and discussed in relation to performance and injury potential. Methods of applying the conclusions to shoe and surface design were suggested.
23

Mind the gap : exploring the decline in physical activity at the transition stage of adolescence in Glasgow youth

Cowley, Joseph G. January 2017 (has links)
This thesis aimed to investigate physical education, physical activity and sport (PEPAS) participation and the adoption of health behaviours in Scottish adolescents. To address this topic, I start with a general reflection on the current state of Scottish health, through the lens of the Scottish and nested Glasgow effects. Subsequently, building on this conceptual base, I outline a series of three studies to further investigate the linkages between PEPAS and accumulating life stress and health behaviours. Accordingly, the thesis narrative consists of 4 distinct research outputs (1 desktop study, followed by 3 studies involving the collection of primary data). These studies were arranged as follows: In Chapter 4 (research study 1), I suggest that a confluence of social, environmental, attitudinal and cultural stressors may combine to negatively influence biological health. The core conclusion of this conceptual paper was that PA may provide a highly efficient, and cost-effective means to remediating some of the issues underpinning the Scottish effect. Chapter 5 (research study 2) presents data comparing patterns of PA uptake in adolescents of low socioeconomic status (SES) backgrounds with more affluent age-matched peers. SES is a significant biopsychosocial stress-elevating consideration. These findings add to mounting evidence suggesting excessively accumulating life stress, not only diminishes health, but simultaneously reduces PA uptake in vulnerable populations. The outcomes of this study thus emphasise the negative relationship between excessive life stress and PA, and highlight that there may be a bidirectional relationship between these factors. Chapter 7 (research study 3) qualitatively investigates the barriers and facilitators of PEPAS and exercise in the broad general education (BGE) phase of CfE in Scotland. Focus groups were conducted with 39 secondary school pupils (S1-S2). This study adds context-specific information highlighting the role of self-image, perceived competence and social influence on PEPAS participation. Subsequent findings indicated that the delivery of traditional PE lessons, which prioritise sporting ability, act as a participation barrier to pupils who consider themselves 'non-sporty'. Chapter 8 (research study 4) builds on Chapter 7 by qualitatively investigating why young people in the post 16 phase of CfE discontinue participation in exercise, sport and PA, whilst analysing reasons for this post compulsory education decline in PA. Previous negative PE experiences were perceived as a major barrier to continued PA. Furthermore, this young cohort perceived that PE teachers focused primarily on physically capable students. Respondents also perceived that access to contemporary fitness activities would be a positive option both during PE lessons, and as a tool to promote lifelong PA. Key conclusions emanating from this thesis included: PA levels were significantly lower in those who had experienced greater accumulated life stress. Thereby suggesting that excessively accumulating life stress not only exerts a negative effect on health, but simultaneously reduces PA uptake in vulnerable populations. Activities where individuals felt singled out, such as fitness testing, present significant barriers to PEPAS. Similarly, an overly competitive, performance-based curriculum acted as a barrier for those who self-identified as 'non-sporty'. Many 16-18-year- olds see current cultural fitness trends as preferable to the range of activities traditionally promoted within PE. It was perceived that previous negative PE experiences acted as a barrier to continued PA into adulthood. A core finding arising from this thesis is the recommendation that promoting lifelong PA habits, particularly in those at risk of elevated life stress, should be a fundamental objective of educators. Furthermore, evidence uncovered during this thesis suggests that PE should be structured around pedagogical models promoting self-efficacy and intrinsic motivation. Also, it is suggested that, during the senior phase, PE should be repackaged into an attractive compulsory brand. Finally, the implementation of current fitness and exercise trends, may prove an effective strategy in promoting lifelong activity and health and wellbeing.
24

Elite athletes: What makes the 'fire' burn so brightly?

Mallett, C. J. Unknown Date (has links)
No description available.
25

Developing and Testing an Integrated Model of Choking in Sport

Wang, Jin January 2002 (has links) (PDF)
In general, choking has been defined as the occurrence of sub-optimal performance under pressure (Baumeister and Showers, 1986). The most widely accepted theory of choking is what I have labeled the 'automatic execution model' (Baumeister, 1984), the basic premise being that choking occurs due to the inhibition of well-learned or automatic skills. The present dissertation was designed to test the automatic execution model in a sport context. Beyond this, I was interested in broadening the research paradigm by concentrating on choking as a process. The five inter-related studies contained in this dissertation tested predictors of choking, perceptions of pressure, coping processes, the automatic execution model, and gender differences. The general aim of this dissertation was to produce an integrated model of choking in sport. The five studies used to examine choking had a total of 89 competitive basketball players as participants (M = 20.01 years old, SD = 2.12). Sixty-four participants took part in studies, 1, 2, 3 and 5. The remaining 25 participants took part in study 4 only. All participants completed a series of basketball free throws in a low-pressure (LP) condition and a high-pressure (HP) condition. Pressure was manipulated by videotaping performance, using an audience, and offering financial incentives. In Study 1, dispositional self-consciousness (S-C) and trait anxiety (A-trait) were tested as potential predictors of choking. Participants (N = 66) completed the Self-Consciousness Scale (SCS; Fenigstein, Scheler, & Buss, 1975) and the Sport Anxiety Scale (SAS; Smith, Smoll, & Schutz, 1990). A correlational analysis and a hierarchical multiple regression analysis supported the hypothesis that athletes high in S-C and somatic A-trait were susceptible to choking under pressure. In Study 2, the effects of manipulated pressure were examined for possible changes in perceived state anxiety (A-state) and subsequently performance. Participants (N = 64) completed the modified Competitive State Anxiety Inventory-2 (CSAI-2; Jones & Swain, 1992) prior to performing in the LP condition and the HP condition. A multivariate analysis of variance (MANOVA) and a correlational analysis showed that participants experienced increased intensity of somatic and cognitive A-state in the HP condition, but the direction (facilitative/debilitative) of somatic A-state and cognitive A-state did not change significantly. Correlation analysis between A-state and performance under pressure was also not significant. In addition, a one-way analysis of covariance (ANCOVA) showed an absence of significant differences in performance between participants who had a negative A-state and participants who had a positive A-state. Study 3 was designed to examine the relationship between coping styles and choking susceptibility. Participants (N = 64) completed the Coping Style Inventory for Athletes (CSIA; Anshel & Kaissidis, 1997). As stated above participants also completed the CSAI-2 prior to performing in the LP and HP conditions. Correlation and hierarchical regression analyses supported the hypothesis that approach coping strategies would result in heightened A-state and performance decrements under pressure. In Study 4, the automatic execution model was tested by investigating possible differences in the occurrence of choking as a function of task characteristics. Participants (N = 25) completed a running task (effort-dominant task) and a free throw shooting task (skill-dominant task) in a LP condition and a HP condition. As hypothesized, a series of t tests showed that the HP condition resulted in improved performance for the running task but decrements in performance for the free-throw shooting task. Study 5 was used to investigate potential gender differences in choking susceptibility. Participants (male = 46; female = 18) had already completed the SCS, SAS, CSIA, and CSAI-2. A one-way MANCOVA showed there were no gender differences in somatic and cognitive A-state changes from the LP condition to the HP condition. Furthermore, a one-way ANCOVA showed no gender differences in performance from the LP condition to the HP condition. In addition, a correlational analysis showed that S-C was more likely to affect performance for females and A-trait was more likely to affect performance for males. Based on the results of these five studies, previous choking research, and the theoretical choking framework, a proposed choking process model is presented and discussed. This proposed choking process model includes susceptibility factors, perception of pressure, coping process, task characteristics, and skill levels.
26

Prevalence of Cardiovascular Risk Factors Among Australian-Lebanese in Melbourne

Shahwan-Akl, Lina January 2001 (has links) (PDF)
In modern industrialized countries coronary heart disease is the single most important cause of death and disability as well as the biggest cause of premature death. There are known global geographical variations in the incidence of coronary heart disease with currently the Eastern European countries having the highest mortality rates, Australia in the middle of the range and Spain, France and Japan having the lowest. Coronary heart disease still remains to be a leading cause of death in Australia, despite its decline in the past 25 years, which is mainly attributed to the improvements in medical management and to the lower prevalence of behaviours which increase the risk of heart disease. Australia is a multicultural society and a country where one person in five is born overseas thus, its national health profile is significantly determined by the health of its immigrants. It is evident from the literature that the mortality rate from CHD amongst immigrant groups in Australia is lower than that of the Australian-born. This is explained by the stringent selection processes involved in migration approvals where only healthy strong immigrants are selected to come to Australia. However, there is increasing incidence of coronary heart disease amongst migrant Australians. Some of the identified factors that may be influencing this increase are mainly those associated with the stress of migration and settlement, loss of status and socioeconomic disadvantage, limited access to health information as well as changes of life style which occur with increased acculturation as the duration of residence in Australia increases. This study was designed to examine the cardiovascular health profile, health knowledge, attitudes, beliefs, and health behaviours, perceptions and barriers to behavioural change of an adult sample of a non-English speaking background community in Melbourne namely, the Australian-Lebanese. The health practices of this migrant group had never been studied and to date there is a paucity of literature regarding their health needs. This study provided information on the demographic and physical characteristics, life style factors, health and associated behaviours in relation to cardiovascular risk factors. The summary of findings below highlights a number of points of interest, and where possible comparisons were made with national figures derived from the 1989 National Heart Foundation Risk Factor Prevalence Study (NHF, 1990). The main findings were: Blood pressure and hypertension: The proportion of men and women who were hypertensive in this study increased steadily with age. 12.5% men and 7% of the women were found to have a diastolic blood pressure above 95mmHg. This is higher than the national figures of the 1989 NHFRFPS that were 11% of Australian men and 5% of Australian women had a diastolic blood pressure above 95 mmHg. High blood cholesterol: The proportion of men and women who had high blood cholesterol levels increased steadily with age. 8% of the men and 10% of the women reported having blood cholesterol levels greater than 6.5mmol/L. This is lower than the 1989 national figures where 16% of the men and 14% of the women had cholesterol levels greater than 6.5mmol/L (NHF, 1990). Smoking behaviour: 44% of the Australian-Lebanese men and 25% of Australia- Lebanese women in this study were smokers compared with 24% of men and 21% of women of the 1989 NHFRFPS (NHF, 1990). All the Australian-Lebanese women smokers were in the middle and younger age groups (less than 44 years). Exercise for recreation sport or health fitness: Lack of exercise for recreation was prevalent among the Australian-Lebanese, about 55% of the men and 47% of the women had no exercise of any kind during leisure time in the preceding fortnight, as compared with 27% of Australian men and women according to the national figures (NHF, 1990). Overweight and obesity: Overweight and obesity were prevalent among the Australian-Lebanese. 71% of the men and 67% of the women were found to be either overweight or obese. This ratio is much higher than the national figures (NHF, 1990) with 60% of the men and 50% of the women being overweight or obese. The prevalence of overweight and obesity in this study increased with age for both sexes. 48% of the total Australian-Lebanese sample were overweight and 24% were obese. 41% of men and 38% of women were overweight and 21% of men and 37% of women were obese. Alcohol intake: Drinking alcohol was not a major risk factor among the Australian- Lebanese sample since most were occasional drinkers. 43% of men and 77% of women said they never drank any alcoholic beverages. This is quite a low ratio compared with the national figures where 87% of the men and 75% of the women drank alcohol. Dietary behaviour: 96% of men and 90% of women did not follow any kind of special diet. A fat-modified diet to lower blood fat was followed by one man and 3 women. One man and one woman reported following a diabetic diet. Five women followed a weight-reduction diet. 61% of men and 68% of women rarely ate fat on meat. 80% of men and 86% of women rarely added salt to cooked food compared to 49% of Australian men and 58% of Australian women who rarely or never added salt to their food (NHF, 1990). Major risk factors: A multiple forward logistic regression was conducted to assess which demographic factors predicted having a major risk factor or not. The strongest predictor was gender, with males more likely to have a major risk factor. The second strongest predictor was age with those in the older age group (45-69 years) being more likely to have a major risk factor and the next strongest predictor was education with those who have no formal education or primary school education only, being more likely to have a major risk factor. These cross-sectional observations provide the basis for interventional-type studies and should lead to appropriate recommendations regarding health promotion and education programs that can contribute to reducing the risks of cardiovascular disease in this non-English speaking background community.
27

Effects of Exercise and Traditional Chinese Medical Modalities on Bone Structure and Function

Xu, Hong January 2002 (has links) (PDF)
Bone loss often leads to osteoporosis. This is a disease characterised by low bone mass and microarchitectural deterioration of bone tissue, leading to enhanced bone fragility and a consequent increase in fracture risk. Osteoporosis is a complicated syndrome whose treatment and prevention crosses many disciplinary boundaries: therefore it is multidisciplinary. The best form of treatment is prevention. Osteoporosis can be limited through the maximization and maintenance of bone strength and minimization of trauma. The purpose of this study was to consider the effects of: physical activity in the form of Tai Ji (Tai Chi), acupuncture and Chinese herbal medicine on bone loss by evaluating bone structure and function in menopausal women. The effects of these modalities were objectively examined through changes in bone material properties and the biomarkers of bone metabolism. Broadband ultrasound attenuation (BUA), a measure of bone structure and density, velocity of sound (VOS), an indicater of the elastic modulus and the breaking forces of bone as provided by ultrasound parameters, were evaluated. The levels of osteocalcin (OSTN) in serum, a biomarker of bone formation and the levels of pyridinoline (PYR) and doxypyridinoline (D-PYR) in urine, which are bone resorption markers were evaluated as parameters of bone metabolism. Traditional Chinese Medicine diagnosis was also used to measure changes in participants' symptoms resulting from Tai Ji exercise, acupuncture and herbal treatment. During an eight month paired cross-over study the effects of three traditional Chinese therapeutic strategies (as described above) on bone structure and function to prevent bone loss were evaluated. Menopausal women are considered one of the most at risk groups for bone loss. Forty menopausal women who completed treatment and testing were divided into three sub groups; 12 into the Tai Ji exercise group, 14 into the acupuncture treatment group and 14 into the herbal treatment group. The groups were then further divided into treatment and control groups. The sub-group for each treatment underwent a four month regime while the control group maintained a normal lifestyle. At the end of the fourth month the groups changed roles with the control group undergoing treatment while the former treatment group reverted to a normal lifestyle. Relevant tests were carried out at the beginning of the study, at the end of the 4th month and at the end of the study (at the end of the 8th month). Subjects in the Tai Ji group completed thirty-two one hour sessions of Beijing 24- movements Tai Ji over sixteen weeks. These movements are designed to gather qi, focus the mind, relax the body, move qi and blood, exercise the muscles, joints and lumbar region. The set of movements improve the balance function of the body and strengthen the muscles and sinews. The results of this study indicated that Tai Ji improved bone structure and increased bone density in menopausal women. There was a 7.3% increase in BUA (p=0.001) when comparing the test results of Groups A+B pre and post Tai Ji exercise. The increased BUA appears to be associated with 39.0% increased bone formation (p=0.001) rather than decreased bone resorption (p > 0.05). Tai Ji exercises also relieved symptoms related to bone loss. It appears that Tai Ji exercise may not only improve balance and confidence in the elderly but also could contribute to improved bone function and structure. The subjects who received acupuncture therapy were assessed according to the principles of traditional Chinese Medicine. Three main acupuncture points in the lower legs, KID 3, SP 6 and ST 36 were used in accordance with the common pattern of disharmony for each of the fourteen participants. Each of the subjects was treated 32 times by the researcher, twice a week for 16 weeks, the duration of each treatment was 30 minutes. The treatment involved the use of points on meridians that tonify and nourish the body. The use of specific acupuncture points on the kidney, stomach and spleen meridians meant that their related organs were tonified, nourished and regulated. Acupuncture of points KID 3, SP 6 and ST 36 tended to increase BUA 8.8% (p=0.005) when comparing the test results of Groups A+B pre and post treatment. The balance between bone formation and resorption improved, OSTN increased 30.9% (p=0.006) which indicates an improvement in bone formation, D-PYR was reduced by 18.5% (p=0.002) indicating a decrease in bone absorption, when comparing the test results of Groups A+B pre and post acupuncture treatment. Acupuncture can also strengthen kidney as evidenced by the relief of symptoms reported in this study. The participants who received traditional Chinese herbal therapy were assessed according to the principle of Traditional Chinese Medicine. 'Shu Di Shan Zha formula' was selected for the treatment group in accordance with the common pattern of disharmony. The decoction (granules mixed with water) was taken twice per day over a period of four months to strengthen the kidney and nourish yin. Chinese medical herbal therapy ' Shu Di Shan Zha formula was able to affect the level of BUA (6.9% increase for Groups A+B pre and post treatment, p=0.03) and a reduction in the level of D-PYR (16.5% decrease for Groups A+B pre and post treatment, p=0.011) in menopausal women as well as ameliorating menopausal symptoms in most of the subjects. However the mechanism of herbal therapy on bone turn-over warrants further study. Broadband ultrasound attenuation (BUA) was higher after the treatment with these three different strategies. Increased levels of osteocalcin (OSTN) in serum and the decreased levels of pyridinoline (PYR) and doxypyridinoline (D-PYR) in the urine were all noted after the treatments and might explain the increased BUA. Results of dual energy X-ray absorbtiometry (DEXA) in the same subjects had a moderate correlation with the BUA readings (r=0.50). BUA is considered a valuable measure of bone structure and density. The study suggests that the three modalities relieve menopausal and bone loss related symptoms. The results imply that the three traditional Chinese therapeutic strategies might delay the occurrence of bone loss by improving the balance of bone turn over and general health in menopausal women.
28

Cardiac Structure and Function in Young Athletes

Shi, Jian Rong January 2003 (has links) (PDF)
The aim of the study was to examine the effects of a long-term endurance-training on resting and exercising cardiac responses on male adolescents. The sample consisted of 13 endurance-trained and 7 non-athletic male adolescents (x +\- SE, age = 15.33 +/- 0.33 and 15.15 +/- 0.23 years, respectively). The volunteers underwent echocardiography at rest to determine left ventricular end diastole dimension (LVDd) and end systole dimension (LVDs), left ventricular posterior wall (PW), stroke volume (SV) and cardiac output (CO). On separate days, tests were conducted on a cycle ergometer to measure VO2max and anaerobic power, and skeletal muscle strength and endurance was determined on an isokinetic dynamometer. The relative peak oxygen uptake (VO2max ml/kg/min) was significantly higher (p < 0.05) in the endurance group (54.4 +/- 1.8) than the control group (45.8 +/- 1.6). The mean trial time was significantly longer in the endurance group (12.9 +/- 0.7 minutes) than the control (10.4 +/- 0.8 minutes; p < 0.05) and there was a significant relationship (r= 0.51; p < 0.05) between the length of test and peak oxygen uptake. No significant differences were noted between the two group in rest heart rate, peak heart rate, LVDd, LVDd/BSA, LVDs, LVDs/BSA, PW, PW/BSA, stroke volume (SV), SV indexed, cardiac output (CO) and CO indexed. The data indicate that endurance-trained male adolescents had higher value of maximal oxygen uptake than untrained male adolescents. The improvements in maximal oxygen uptake were associated with longer exercise time. Endurance-trained adolescents did not exhibit greater left ventricular internal dimension, left ventricular wall thickness, SV and CO at rest compared to the untrained. This observation suggests that endurance training stimulus need to be of greater intensity, duration and frequency in adolescent. In addition, the control group may have been engaged in sufficient exercise as to blur any differences that otherwise may have occurred. Furthermore, genetic factors may be more important in determining cardiovascular development and performance in adolescents, than was previously thought.
29

Development and application of expertise in elite-level coaches

Walsh, Julia January 2004 (has links) (PDF)
Research providing insight into how coaches behave has mainly been sourced from an athlete perspective or from observing and recording coach behaviour in context. Only a few studies have recognized the views of the expert coach as a potentially valuable source of information. Yet only coaches can provide insight into their histories, learning, goals, beliefs, knowledge, and decision making, and decode the complex interactions that occur in the dynamic context of coaching. The purpose of this thesis was to investigate how elite-level coaches developed and used expertise. Twenty successful coaches working with Australian junior, elite sport participants were purposefully sampled to cover a diversity of sports (team and individual) and to provide a gender balance.
30

Print media representation of crisis events in Australian football

Nicholson, Matthew January 2002 (has links) (PDF)
This thesis adds a new dimension to the analyses of the sport media nexus by examining the scope of the roles the media adopt during a crisis event in sport. Specifically, this thesis explores the ways in which the print media represents crisis events in sport, how the representation of crisis events is influenced by the organisational and commercial context and the extent to which this representation evolves over time. The thesis is comprised of three case studies: the debate over the South Melbourne Football Club's relocation to Sydney in 1981; the Footscray Fightback campaign to save the Footscray Football Club in 1989; and the Fitzroy Football Club's merger with the Brisbane Football Club in 1996. In each instance the case study is analysed using a theoretical framework of analysis, developed from the literature. As a result of the analyses, a new theoretical framework of analysis for the print media representation of context specific crisis events in sport is proposed.

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