Doctoral Degrees (Exercise, Sport and Lifestyle Medicine)

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Browsing Doctoral Degrees (Exercise, Sport and Lifestyle Medicine) by browse.metadata.advisor "Ferreira, Suzanne"

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    Bridging the gap from inpatient rehabilitation to sustainable health and wellness in spinal cord injured individuals
    (Stellenbosch : Stellenbosch University, 2016-12) Vermaak, Candace; Ferreira, Suzanne; Terblanche, Elmarie; Stellenbosch University. Faculty of Education. Dept. of Sport Science
    ENGLISH ABSTRACT : Background: A spinal cord injury is a devastating and life changing neurological event that present multiple challenges throughout the life of the affected individual. One of the challenges is being physically active and more specifically healthy living. Physical activity has many benefits and plays an essential role in community reintegration, which is considered the final outcome of the rehabilitation process. In South Africa this outcome is seldom achieved due to the lack of physical activity opportunities. Without regular physical activity the physical gains that were achieved in hospital are easily diminished or lost and this is a major concern as it ultimately affects health and wellness. Objective: To determine the barriers and facilitators to physical activity and whether an intervention designed to reduce the barriers can be successful in promoting health and wellness in people with a spinal cord injury. Design: An experimental research design incorporating both quantitative and qualitative methodologies was used to execute the study. Methods: A self-developed research questionnaire was distributed to people with a spinal cord injury in the Western Cape, South Africa in order to identify the barriers to physical activity. The results from the research questionnaire were used to design a 16 week intervention which was implemented in two different environments (formal exercise setting and community based setting) and its success was measured by physical tests, the reintegration to normal living index questionnaire and the research questionnaire. Subjects: Fifty seven people with a spinal cord injury completed the research questionnaire and 16 participants partook in the intervention. Results: In the beginning (pre-intervention) the most important barriers were the environmental barriers and included problems with accessibility and lack of facilities, lack of transport, and the weather. The most reported facilitators were personal, which included a desire to be active, to improve self esteem and because physical activity made them feel good. Based on the results from the research questionnaire the intervention was implemented and showed that the participants from both groups improved their physical abilities (strength, endurance and functional abilities) and their satisfaction with community participation. The barriers that were identified prior to the intervention were also considerably reduced, especially in the community based group. The participants also agreed that physical activity was beneficial and important and that they would like to stay physically active post-intervention. Discussion and Conclusion: People with a spinal cord injury face many barriers in being physically active, however, by reducing the barriers a community based physical activity program can be successful in introducing people with a spinal cord injury to a life of healthy living and wellness. Although some of the environmental and program barriers remained, the personal facilitators that were identified were enough to ensure physical activity adherence.
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    Characterisation of running specific prostheses and its effect on sprinting performance
    (Stellenbosch : Stellenbosch University, 2015-12) Grobler, Lara; Terblanche, Elmarie; Ferreira, Suzanne; Stellenbosch University. Faculty of Education. Dept. of Sport Science.
    ENGLISH ABSTRACT: The development of the running specific prosthetic (RSP) has allowed athletes with lower limb amputations to participate at a high level in sports such as sprinting. Literature regarding mechanical properties of RSPs and their influence on the athlete’s performance, on the other hand, is limited. This makes prosthetic selection a difficult task. The aim of this study was to assess the biomechanical and physiological effects of the mechanical characteristics of different RSPs on an athlete’s sprinting performance. The sprint performances of athletes with lower limb amputations were described in a retrospective analysis of Olympic and Paralympic times between 1992 and 2012, in an attempt to assess whether the technological advances in RSPs is evident. A 14 – 26% performance improvement was found for the T42 and T44 classes of the 100 and 200 m during this time in comparison to 2.2 – 2.8% for the Olympic athlete performances. These results were further supported by the lower competition density found in the amputee groups (Olympic 23.90 and 9.29 competitors.s-1; T42 4.53 and 1.93 competitors.s-1). It was therefore proposed that technology played a significant role in the performance progression of these athletes over the last 20 years. Differences in the characteristics of two RSP models (model E and X) were investigated. This was achieved by athlete independent mechanical testing during which the RSPs were dropped from a height of 30 cm and left to bounce on a force platform. The results revealed differences in the peak ground reaction force (GRFpeak) (model E > model X; p < 0.05) and maximal RSP compression (ΔL) (model X > model E; p < 0.05). This indicated that the RSP model E is more stiffness than the model X. These stiffness characteristics related to discrepancies in sprinting economy of an athlete completing four maximal anaerobic running tests (MART) using different RSPs. Two RSP stiffness categories of each model (Ecat4, Ecat6, Xcat4, Xcat6) were used for this testing and was randomly allocated to each testing session. It was found that the running speed at which the athlete attained a blood lactate concentration of 10 mmol.l-1 was the highest with the stiffest RSP (Ecat6), whereas it was the lowest in the softest RSP (Xcat4). Accordingly the lowest functional muscular fatigue as measured by a decrease in the pre and post-test counter movement jump height was found in this condition (Ecat6 7.35% vs. Xcat4 24.43%). From these investigations it was clear that technology is an important factor in the performances of amputee sprint athletes. Therefore prosthetic selection is of the utmost importance. Differences in the mechanical characteristics of the RSPs influence the sprint physiology and biomechanics and should therefore be taken into consideration when selecting a RSP.