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5000 Blk Parkwood Court, Manitou Beach MI Ndlovu, Privilege B. M. (2013-12)
Thesis (MScSportSc)-- Stellenbosch University, 2013.
ENGLISH ABSTRACT: There is a growing concern in South Africa and worldwide about the global epidemic of obesity and overweightness among the general population. Obesity mediates the pathogenesis of pathological conditions and is associated with a poor quality of life, high morbidity and mortality rates and a huge burden on an individual’s and the health system’s infrastructure and finances. The answer to this rising epidemic is weight loss. Endurance training has been shown to induce weight loss however, people usually cite lack of time as a barrier to meaningful participation in exercise programmes. High intensity interval training (HIIT) therefore emerges as a potential solution to these barriers as it takes a relatively short period of time compared to endurance training. Despite the differences in exercise durations the most cogent advantage is that HIIT elicits not just similar, but even superior central and peripheral adaptations. The central and peripheral adaptations have been shown to enhance weight loss, improve blood lipids and glucose levels, as well as decreasing blood pressure.
The challenge facing exercise physiologists is to find the optimal exercise intensity and duration of HIIT bouts which would be time efficient, safe and well tolerated by overweight and obese people. The shortcomings of literature are that most HIIT studies have focused on healthy, overweight and obese men and these studies cannot be extrapolated to women who have been shown to respond differently to training. Moreover, other interventions investigating the effects of HIIT in women and men have been longer term rather than short term interventions. In order to fill the gaps in the literature, the main aim of this study was to investigate the training and detraining effects of a short-term HIIT programme on selected health-related measures in young overweight and obese women.
To this end, a non-random sample of 20 overweight and obese women (aged 18-25) volunteered to participate in this study. Selected health-related outcomes were measured prior to training. The pre-training testing was followed by the HIIT intervention which was two weeks and consisted of six sessions using the 10 – 15x1 minute running at 90% HRmax which was separated by one minute active recovery periods at 50-60% of HRmax. The HIIT intervention was followed by a post test in which baseline measurements were repeated. This was then followed by a two week detraining period and follow up testing.
The main finding of this study was that a period of two weeks of HIIT can elicit adaptations that can lower the risk profiles of young overweight and obese women. The results showed a statistically significant decrease in body mass (1.6%, p = 0.001), fat mass (3.7%, p = 0.001) and waist circumference (4.8%, p = 0.001), and an increase in lean mass of 1.9% (p = 0.001). There was also a decrease in blood glucose (11%, p = 0.001), total cholesterol (10.4 %, p = 0.01), systolic (3.4%, p = 0.001) and diastolic blood pressure (5.8%, p = 0.001) levels. Finally there was a statistically significant increase in relative VO2max and exercise capacity after the HIIT
The follow-up testing after two weeks of detraining shows that the metabolic adaptations that were achieved by the HIIT protocol are relatively lasting or are at least not completely reversed. The weight loss induced by HIIT is important in that it is the major target in lowering the prevalence of overweightness and obesity. The HIIT protocol in this study emerges as a time efficient strategy in eliciting positive adaptations in clinical populations and healthy people. Moreover these findings suggest that 10 minute and 15 minute HIIT work bouts at near-maximal intensities are possibly the minimum amount of training that is needed to induce significant weight loss and other positive health-related outcomes.
AFRIKAANSE OPSOMMING: Daar bestaan ŉ toenemende besorgdheid in Suid-Afrika en wêreldwyd oor die globale epidemie van obesiteit en oorgewig onder die algemene bevolking. Obesiteit fasiliteer die patogenese van verskeie siektetoestande en word met ŉ swak kwaliteit lewe, hoë morbiditeit en mortaliteit en ŉ geweldige las op ŉ individu en die gesondheidsowerhede se infrastruktuur en finansies geassosieer. Een van die antwoorde op hierdie stygende epidemie is gewigsverlies. Dit is reeds gewys dat uithouvermoë oefening saam met ŉ kalorie beperkende dieet gewigsverlies in die hand werk. Mense dui egter ŉ tekort aan tyd as ŉ hindernis tot betekenisvolle deelname aan ŉ oefenprogram aan. Hoë intensiteit interval inoefening (HIIO) is dus ŉ potensiële oplossing tot hierdie hindernis aangesien dit in vergelyking met uithouvermoë inoefening in ŉ relatiewe korter periode van tyd uitgevoer kan word. Afgesien van die verskille in inoefenperiodes is die mees logiese voordeel dat die HIIO nie net soortgelyke nie, maar self beter sentrale en periferale fisiologiese aanpassing voortbring. Die sentrale en periferale aanpassing verhoog gewigsverlies, verbeter bloedlipiedes en glukose vlakke, en veroorsaak ŉ afname in bloeddruk.
Alhoewel ŉ aantal studies die voordele van HIIO by jonger en ouer populasies aandui, is baie min studies op vrouens uitgevoer. Bevindinge kan nie noodwendig na vrouens ekstrapoleer word nie omdat hulle dikwels verskillend op inoefening as mans reageer. Dit is ook nie bekend of ŉ kort HIIO intervensie ŉ betekenisvolle impak op oorgewig en vetsugtige vrouens sou hê nie, asook hoe blywend enige veranderinge sou wees nie. Die hoofdoel van hierdie studie was dus om die inoefening- en die geen-inoefening effekte van ŉ korttermyn HIIO program op geselekteerde gesondheidskenmerke in jong oorgewig en vetsugtige dames te bepaal.
ŉ Nie-ewekansige steekproef van 20 oorgewig en vetsugtige vrouens (18-25 jaar) het vrywillig ingestem om aan hierdie studie deel te neem. Geselekteerde gesondheidskenmerke is voor die aanvang van die inoefening gemeet. Die HIIO intervensie het twee weke geduur en het uit ses sessies bestaan (10 – 15x1 minuut draf by 90% HSmaks en een minuut aktiewe herstel by 50-60% HSmaks). Die HIIO intervensie is deur ŉ na-toets gevolg waarin basislyn metings herhaal is. Dit is deur ŉ twee weke geen-inoefening periode en opvolgtoetse opgevolg.
Die hoofbevinding van hierdie studie was dat ses sessies van HIIO fisiologiese aanpassings na vore gebring het wat die risiko profiele van jong oorgewig en vetsugtige vrouens verlaag het. Daar was statisties betekenisvolle afnames in liggaamsmassa (1.6%, p < 0.001), vetmassa (3.7%, p < 0.001) en heupomtrek (4.8%, p < 0.001) en ŉ toename in vetvrye liggaamsmassa van 1.9% (p < 0.001). Daar was ook ŉ afname in bloedglukose (11%, p < 0.001), totale cholesterol (10.4 %, p = 0.01), sistoliese (3.4%, p < 0.001) en diastoliese bloeddruk (5.8%, p < 0.001). Daar was ook statisties betekenisvolle verbeteringe in relatiewe VO2maks en oefeningtoleransie na inoefening. Die opvolgtoetse na twee weke van geen-inoefening het getoon dat metaboliese aanpassings wat deur die HIIO bereik is, relatief blywend van aard was of ten minste nie totaal omgekeerd was nie. Die gewigsverlies wat deur die HIIO veroorsaak was is belangrik in die sin dat dit die hoofdoelwit aanspreek om die voorkoms van oorgewig en vetsugtigheid te verminder. Die studie suggereer verder dat 10 – 15 minute HIIO werksessies, by naby maksimale intensiteite, moontlik die minimum hoeveelheid inoefening is wat benodig word om betekenisvolle gewigsverlies en ander positiewe gesondheidskenmerke te bereik.
Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/85824
This item appears in the following collections: Masters Degrees (Sport Science)104