Postgraduate Profiles

Nicole Crisp

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Thesis: Impact of Moderate Intensity Continuous Exercise Compared with Sprint Interval Exercise on Substrate Oxidation and Fat Loss in Overfat Boys

This research will determine whether a 3-min graded exercise test accurately determines the exercise intensity that maximises fat oxidation (Fatmax) in overfat boys. Once this has been achieved, the acute effects of moderate intensity continuous exercise at Fatmax compared with sprint interval exercise on absolute energy expenditure (during- and post- exercise), enjoyment and perceived exertion will be examined in the same population. The longer term effects that these two exercise modalities have on fat loss, substrate oxidation (absolute fat oxidation and the Fatmax), aerobic fitness and exercise adherence will also be determined.

Why my research is important

Obesity is associated with an increased risk of developing many detrimental physiological and psychological health conditions. Of particular concern however, is that many of these health conditions were once thought of as only applicable to adults, but are now presenting in children as a result of carrying excess body fat.

Low to moderate intensity continuous exercise is often prescribed for individuals who desire to lose weight because a greater proportion of fat is oxidised than during high intensity exercise. However, as the exercise intensity increases, energy expenditure also increases, as does the absolute amount of fat oxidised (during- and post- exercise). Furthermore, moderate intensity exercise for fat loss is often monotonous and time consuming and may not appeal to children enough to promote exercise adherence in the long-term.

This is first study to examine the acute and long-term effects that two different modalities of exercise have on energy expenditure, enjoyment and perceived exertion, and fat loss, substrate oxidation, aerobic fitness and exercise adherence in overfat children.

Ultimately, this research may form a strong basis for the development of more appealing exercise interventions for overweight children which will result in increased exercise adherence, enhanced fat loss and long-term weight maintenance.


Mar 2008

Mar 2011